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Dec.2004

Receiving Data from an External MIDI Device (Bulk Load)
Making the Connections
When Receiving Data Saved on a MIDI Sequencer
Connect as shown below. Set the GT-8's Device ID to the same number that was used when the data was transmitted to the MIDI sequencer.
fig.08-190

fig.08-220d

At this stage, even more data can be received. 3. Press [EXIT] to quit Bulk Load. After you press [EXIT], "Checking..." appears in the display, indicating that the GT-8 is checking the received data. When the check is completed, the Play screen returns to the display.

FACTORY RESET INSTRUCTIONS
MIDI OUT

Restoring the Factory Settings (Factory Reset)
Restoring the GT-8 to the settings made at the factory is referred to as "Factory Reset." Not only can you return all of the settings to the values in effect when the GT-8 was shipped from the factory, you can also specify the range of settings to be reset.
fig.09-060

MIDI IN

2 1
* For instructions on operating the sequencer, refer to the owner's manual for the sequencer you are using.

3

3

Receiving
fig.08-191

1,2

4
1. 2. Turn off the power. While holding down PREAMP/SPEAKER On/Off button and [TYPE VARIATION], turn on the power. The Factory Reset range setting screen appears in the display.
fig.09-070d

3
1. Press [SYSTEM] twice, then press PARAMETER [ "MIDI: Bulk Load" is displayed. ][ ] so that * 3.

The range of data you wish to factory reset
To cancel Factory Reset, press [EXIT]. Press PARAMETER [ ][ ] to move the cursor, and rotate the PATCH/VALUE dial to specify the range of settings you want to restore to factory settings.

fig.08-200d

2.

Transmit the data from the external MIDI device. The following appears in the display when the GT-8 receives the data.

fig.08-210d

value Explanation System System parameters, Harmonist scales, Auto Riff phrases, and Preamp/ Speaker, Overdrive/Distortion, and Wah Custom Edit parameter settings Quick Content of the Settings Made with User Quick Setting #1-1-#35-4 Settings for Patch Number 1-1 through 35-4 4. If you want to proceed with the factory reset, press [ENTER]. The specified range of data will be returned, and return to the Play screen.

The following appears in the display when the GT-8 finishes receiving the data.

18

GT-8

SYSTEM SOFTWARE UPDATING INSTRUCTIONS
Required Equipment
· · · Sequencer (MC-80 or other) MIDI cable Update disk (#17041564)

4.

After the GT-8 has received all of the SMF data, a checksum (4-digit number) of the system software is run; confirm the checksum value.

fig.4-01up

All Completed. Sum=****

TEST MODE
If the GT-8 contains any user data, be sure to back up the data to a sequencer (MC-80 or other) before servicing (for instructions on holding user data, refer to "Saving Data" and "Loading Data").

Cautionary Note Do not turn off the power to the GT-8 during writing of the system software. This will prevent the system from being written properly to the flash ROM, and as a result, the GT-8 will not operate.

Test Categories
Cautionary Note Carry out Factory Reset after completing the update. 1.DSP Check 2.Display 3.LCD Contrast 4.Switch 5.VR Check 6.EXP PEDAL The GT-8 system is provide in Standard MIDI File (SMF) format. The disk contains the following SMF data; transfer the files to the GT-8 in sequence, starting from GT8_01.mid. GT-8 System Ver.*.** SMF Disk: GT8_01.mid GT8_02.mid GT8_03.mid GT8_04.mid GT8_05.mid GT8_06.mid GT8_07.mid GT8_08.mid GT8_09.mid GT8_10.mid GT8_11.mid GT8_12.mid GT8_13.mid GT8_14.mid GT8_15.mid GT8_16.mid Update the GT-8 system using the following procedure. 1. 2. Connect the sequencer's MIDI OUT connector and the GT-8's MIDI IN connector with a MIDI cable. Hold down the ASSIGN [CTL/EXP], [NAME], and [MANUAL] buttons and turn on the power to the GT-8. 7.Battery 8.MIDI IN/OUT 9.AMP CTRL 10.OUTPUT D/A 11.EXT LOOP 12.INPUT A/D 13.DSP INT0 14.Noise(IN->OUT) 15.Noise(LOOP) 16.Calibrate EXP 17.Factory Load

Updating the System with SMFs

fig.2-01up

FJ: Waiting SMF [GT8_01.mid]

Required Equipment
· · Expression Pedal (Roland EV-5) MIDI cable Oscilloscope Audio instrument which has DIGITAL in and Analog out. Guitar amp (equipped with jacks for switching channels/channelswitching jack) Oscillator 2 monitor amps Noise meter Blank plug · · · ·

appears in the LCD display, indicating the GT-8 is in standby mode. 3. Transmit the SMF data in GT8_01.mid from the sequencer to the GT-8. When MIDI signals are received by the GT-8, the write address and checksum appear in the LCD display.
fig.3-01up

GT8_01.mid ********

SUM ****

· · ·

When reception of GT8_01.mid is completed,
fig.3-02up

Entering Test Mode
Simultaneously hold down the [DELAY] and [REVERB] buttons and turn on the power to the GT-8. The version number and checksum appear in the lower row of the LCD display.
fig.test

Now Updating... ******** ****

appears in the GT-8's LCD display. Subsequently, the following is displayed.
fig.3-03up

FJ: Waiting SMF [GT8_02.mid]

GT-8 Build*** Ver. *.** [****]

Transmit the SMF data in GT8_02.mid from the sequencer. In the same manner, continue to play back the SMF data in the remaining files until the data in GT8_16.mid is loaded.

Press the PARAMETER [>] button to proceed to "1. DSP Check."

19

Dec.2004

Quitting Test Mode
Power off the unit. 1. DSP Check Press [WRITE]; the DSP is checked, and the results of the check are displayed. If an error has occurred, the type of error is indicated; if the DSP is operating properly, "OK" is displayed. If operating properly
fig.1-01test

[3] Seven-Segment LEDs Confirm that the segments in the seven-segment LEDs go off one at a time each time [WAH] is pressed. All of the segments should be off after the [WAH] button is pressed 14 times. Press the PARAMETER [>] button to proceed to "5. VR Check."

5. VR Check
Confirm that all of the VRs are turned down to the MIN position. Press the [WRITE] button; the name of the VR being checked appears in the bottom row of the LCD. Rotate the indicated display.
fig.5-01test

1.DSP Check --- OK ! ---

If an error has occurred (NG: No Good)
fig.1-02test

5.VR Check PRE TYPE 1.DSP Check PRAM:-- ERAM:NG

1.DSP Check PRAM:NG ERAM:

--

[1] Clicking VRs [PRE TYPE] -> [OD/DS TYPE] Rotate the knob from MIN to MAX and back to MIN, and confirm that the value indicated in the seven-segment LEDs matches the corresponds notch position. [2] Non-clicking VRs [PATCH LEVEL] -> [PRE LEVEL] -> [PRE PRESENCE] -> [PRE TREBLE] -> [PRE MIDDLE] -> [PRE BASS] -> [PRE GAIN] -> [OD/DS DRIVE] -> [OD/DS LEVEL] -> [DELAY FEEDBACK] -> [DELAY LEVEL] -> [CHORUS LEVEL] -> [REVERB LEVEL] Rotate the knob from MIN to MAX, and confirm that the segments in the seven-segment LEDs light in sequence from the bottom in correspondence with the change in knob position. After all have been checked, "OK" appears in the display. Press the PARAMETER [>] button to proceed to "6. EXP PEDAL."

Press the [EXIT] button, then press the PARAMETER [>] button to proceed to "2. Display."

2. Display
Press [WRITE]; all of the LCD segments light up, and all LED indicators and seven-segment LEDs remain lit. Press [EXIT] to proceed to "3. LCD Contrast."

3. LCD Contrast
fig.3-01test

3.LCD Contrast Contrast=15

6. EXP PEDAL
Confirm the changes in the GT-8's EXP pedal as an expression pedal connected to the [SUB EXP PEDAL/SUB CTL 1,2] jack. Connect an EV-5 to the [SUB EXP PEDAL/SUB CTL 1,2] jack. Press the [WRITE] button. The display changes to the following.
fig.6-01test

Rotate the [PATCH/VALUE dial] in the following procedure to confirm the corresponding changes in the LCD contrast. 1) Rotate the dial counterclockwise; the contrast decreases and the screen darkens. Rotate the dial until the contrast reaches 0. 2) Rotate the dial clockwise; the contrast increases and the screen brightens. Rotate the dial until the contrast reaches 15. Press the [EXIT] button, then press the PARAMETER [>] button to proceed to "4. Switch."

6.EXP PEDAL [---][---][---]

4. Switch
Press the [WRITE] button; all of the LEDs light up, and the name of the button being checked appears in the lower row of the LCD.
fig.4-01test

Press the GT-8 EXP pedal and confirm that content shown in the LCD changes as described below. 1) When the pedal is position approximately midway:
fig.6-02test

6.EXP PEDAL [---][***][---]

4.Switch PREAMP

2) When the pedal is pressed fully forward:
fig.6-03test

Press the switch corresponding to the indicated button. "Wrong Switch" appears in the display if the incorrect switch is pressed. For buttons with LEDs, confirm the following. 1) The LED is lit before the button is pressed. 2) The LED is off after the button is pressed. Press the switches in the following sequence. [1] Check of the effect select buttons and edit buttons: [PREAMP] -> [PRE VARIATION] -> [PRE Ch A] -> [PRE Ch B] -> [PRE SOLO] -> [PRE SPEAKER] -> [OD/DS] -> [OD/DS VARIATION] -> [DELAY] -> [DELAY TAP] -> [CHORUS] -> [REVERB] -> [FX-2] -> [FX-1] -> [WAH] -> [COMP] -> [EQ] -> [LOOP] -> [AMP CTL] -> [MASTER] -> [ASSIGN CTL/EXP] -> [FX CHAIN] -> [EXIT] -> [PARAMETER (<)] -> [PARAMETER (>)] -> [WRITE] -> [NAME] -> [ASSIGN VARIABLE] -> [MANUAL] -> [TUNER/BYPASS] -> [SYSTEM] -> [OUTPUT SELECT] [2] Check of the pedal switches and expression switches: [BANK DOWN] -> [BANK UP] -> [BANK UP(EXP)] -> [CTL PEDAL] -> [PEDAL 4] -> [PEDAL 3] -> [PEDAL 2] -> [PEDAL 1]

6.EXP PEDAL [---][***][***]

3) When the pedal is brought back fully:
fig.6-04test

6.EXP PEDAL [***][***][***]

If the pedal is functioning properly, the display changes to the following; use the same procedures to check the EV-5.
fig.6-05test

6.SUB EXP PEDAL [---][---][---]

Press the PARAMETER [>] button to proceed to "7. Battery."

20

GT-8 7. Battery
Press the [WRITE] button; the voltage of the memory backup battery is displayed.
fig.7-01test

that the waveform alternately changes as shown below.
f i g . 0 0 3 . e p s f i g . 0 0 2 .

<-->
7.Battery 3.1V

Error indications: "*.*V Low": When the battery voltage is 2.0-2.6 V. "No Battery!!": When there is no battery, or when the battery voltage is below 2.0 V.
eps

Connect the oscilloscope (Channel 1 and 2) to the PHONES jack, and use the same procedure to confirm the waveform output. Connect the oscilloscope (Channel 1 and 2) to the digital to analog converter, and use the same procedure to confirm the waveform output.

If the above occurs, supply the unit with a new lithium battery. Press the [EXIT] button and then press the PARAMETER [>] button to proceed to "8. MIDI IN/OUT."

Connect the oscilloscope (Channel 1) to the SEND jack, and confirm that the waveform alternately changes as shown below.
f i g . 0 0 4 . e p s f i g . 0 0 2 .

8. MIDI IN/OUT
fig.8-01test

<-->

8.MIDI IN/OUT

eps

Connect the MIDI IN and MIDI out connectors with a MIDI cable. Press the [WRITE] button. If the two connectors are not connected by the MIDI cable, "No Connect" appears in the bottom row of the LCD display. If the two connectors are properly connected, "Verify OK!" is displayed. Press the PARAMETER [>] button to proceed to "9. AMP CTRL."

Press the [EXIT] button and then press the PARAMETER [>] button to proceed to "11. EXT LOOP."

11. EXT LOOP
Connect the OUTPUT L/R jacks to the oscilloscope (Channel 1 and 2). Press the [WRITE] button.
fig.11-01test

9. AMP CTRL
Connect the AMP CTRL jack and the channel switching jack on the guitar amp. Press the [WRITE] button; AMP CTRL automatically switches on/off.
fig.9-01test

11.EXT LOOP [DSP>EXT>OUT]

9.AMP CTRL CTRL Off

<-->

9.AMP CTRL CTRL On

Confirm that the following type of waveform is output.
fig.005.eps

Confirm that the guitar amp channels are switched. Press the [EXIT] button and then press the PARAMETER [>] button to proceed to "10. OUTPUT D/A."

10. OUTPUT D/A
Set the oscilloscope are follows. 1.0 V/DIV, 0.5 ms/DIV Press the [WRITE] button; a rectangular wave is output from the OUTPUT jack, and Mute is switched on/off.
fig.10-01test

Insert the blank plug in the RETURN jack, and confirm that there is no waveform. After confirming this, remove the blank plug from the RETURN jack. Press the [EXIT] button and then press the PARAMETER [>] button to proceed to "12. INPUT A/D."

10.OUTPUT D/A Mute Off/-

<-->

10.OUTPUT D/A Mute ---/On

Set the OUTPUT VR to MAX. Connect only the OUTPUT L(MONO) jack to the oscilloscope (Channel 1), and confirm that the waveform alternately changes as shown below. Do not connect anything to OUTPUT R.
f i g . 0 0 1 . e p s f i g . 0 0 2 .

<-->

eps

Connect only the OUTPUT R jack to the oscilloscope (Channel 2), and confirm

21

Dec.2004 12. INPUT A/D
Input a rectangular wave, and observe the output waveform with the oscilloscope. INPUT: Rectangular wave, 400 Hz, 40 mVp-p Press the [WRITE] button.
fig.12-01test

15. Noise(LOOP)
INPUT -> A/D -> DSP -> D/A -> SEND -> RETURN -> A/D -> DSP -> D/A > OUTPUT (Connect noise meter and observe)

12.INPUT A/D [IN----->OUT]

Note: Check with both L(MONO) and R jacks. When the OUTPUT jacks are used individually, the left and right channel signals are mixed internally, so be sure to insert a blank plug in the R channel output when measuring the L(MONO) channel; when checking the R channel, insert the blank plug in the L(MONO) channel jack. Press the [WRITE] button.
fig.15-01test

Confirm that the following type of waveform is output.
fig.006.eps

15.Noise(LOOP) [RETURN->OUT]

OUTPUT Level:MAX Confirm that the residual noise is no more than -84.0 dB (JIS-A). Rotate the OUTPUT VR from MAX to MIN and to MAX again, and confirm that the amplitude of the waveform changes smoothly as the knob is turned. Press the [EXIT] button and then press the PARAMETER [>] button to proceed to "13. DSP INT0." Press the [EXIT] button and then press the PARAMETER [>] button to proceed to "16. Calibrate EXP."

16. Calibrate EXP
Set the EXP pedal minimum and maximum values and the EXP pedal switch threshold. Press the [WRITE] button.
fig.16-01test

13. DSP INT0
Press the [WRITE] button; the DSP's internal oscillator-generated pitch interrupt signal is checked. If an error occurs, the type of error is indicated in the display, and if operation is normal, "OK!" is displayed. If OK:
fig.13-01test

16.Calibrate EXP Set Pedal to MIN

<-->

16.Calibrate EXP press [WRITE]

Bring the EXP pedal back completely, release, and press the [WRITE] button.
13.DSP INT0 --- OK ! ---

When set, "OK!" appears in the display, which subsequently shows the following. If operating properly:
fig.16-02test

If an error occurs:
fig.13-02test

16.Calibrate EXP Set Pedal to MAX 13.DSP INT0 ---ERROR!---

<-->

16.Calibrate EXP press [WRITE]

If an error occurs:
fig.16-03test

Press the PARAMETER [>] button to proceed to "14. Noise(IN->OUT)."

16.Calibrate EXP - Area Over ! -

14. Noise(IN->OUT)
INPUT -> A/D -> DSP -> D/A -> OUTPUT (Connect noise meter and observe) Press the EXP pedal fully forward, release, and press the [WRITE] button. When set, "OK!" appears in the display, which subsequently shows the following.
fig.16-04test

Note: Check with both L(MONO) and R jacks. When the OUTPUT jacks are used individually, the left and right channel signals are mixed internally, so be sure to insert a blank plug in the R channel output when measuring the L(MONO) channel; when checking the R channel, insert the blank plug in the L(MONO) channel jack. Press the [WRITE] button.
fig.14-01test

16.Calibrate EXP Threshold: 6

Rotate the [PATCH/VALUE] dial to "6" and press the [WRITE] button. When set, "OK!" appears in the display. This completes Test mode. Press the PARAMETER [>] button to proceed to "17. Factory Load."

14.Noise(IN>OUT) [IN----->OUT]

Press the [EXIT] button to quit Test mode.

OUTPUT Level:MAX Confirm that the residual noise is no more than -86.0 dB (JIS-A). Press the [EXIT] button and then press the PARAMETER [>] button to proceed to "15. Noise(LOOP)."

22

GT-8 17. Factory Load
Press the [WRITE] button; the following is displayed.
fig.17-01test

17.Factory Load press [WRITE]

Press the [WRITE] button again.
fig.17-02test

17.Factory Load sure?

Press the [WRITE] button again to execute Factory Reset.
fig.17-03test

Now writing...

When Factory Reset is completed, the following is displayed.
fig.17-04test

17.Factory Load

Press the [EXIT] button to return to the normal operating mode. If no battery has been placed in the unit, "No Battery!" is indicated in the display. Place a new lithium battery in the unit.

23

Dec.2004

BLOCK DIAGRAM
fig.block.eps

MIDI IN / OUT SUB EXP PEDAL / SUB CTL 1, 2 AMP CONTROL

JK7 JK8 IC22 CPU H8S/2312S IC37 PHOTO RELAY TLP172A IC2a IC1a IC6a IC6b VR1 TR1 JK9 IC2b IC5a IC5b IC3 CODEC AK4552

CN5 CN1

EXP BOARD ASSY PEDAL VR ENC BOARD ASSY ENCODER CN4

JK10

CN6 CN9 CN4 CN8 IC20 DSP (MASTER) CN3 CN7 CN2 CN5 IC19 SRAM 2M

CN6 SW1 BOARD ASSY PANEL SW, LED

JK1 INPUT JK2 PHONES JK3 OUTPUT L (MONO) OUTPUT R JK4

SW2 BOARD ASSY PEDAL SW, LED CN2 CN3 SW3 BOARD ASSY PEDAL SW, LED

IC28

DIGITAL OUT

IC27 CS8406

IC25 FLASH 8M

SW SHEET ASSY LCD UNIT

JK5 RETURN

IC7a

IC8a IC8b IC9 CODEC AK4552 IC21 DSP (SLAVE)

IC12 CMOS IC15 CMOS

CN1

JK6 SEND

IC7b

MAIN SHEET ASSY

IC24 DRAM

24

GT-8

25

Dec.2004

GT-8

CIRCUIT BOARD (MAIN SHEET)
fig.b-main1.eps

View from components side

27

Dec.2004
fig.b-main2.eps

GT-8

View from foil side

29

Dec.2004

GT-8

CIRCUIT DIAGRAM (MAIN SHEET 1/3) (Power)
fig.c-main-power.eps

D7 1 2 1N4004 C149 470/35

R118 10 (0805size) 1 C150 0.1 R157 N.I.U.(miniSMDC075)

IC30 BA17805FP IN OUT 3 C151 0.1

D +5 2 C152 N.I.U. C153 47/16 C154 0.1

IC31 S-812C33AY-Z GND IN OUT 3 C155 0.1

+

COM

2

D D SW1A SDKLA1-B D8 1 C157 ERZVA7V330 C158 2200/35 C159 N.I.U. D D D IC32 NJM2374AM 2 1 2 8 1N4004 HEC0740-010010 D FL2 DSS9ND31H223Q91J R122 0.68 (1/2W) 7 6 SI V+ 1 L16 N.I.U.(0) R120 N.I.U.(1/2W) D R121 1k 1 2

D D A

3

JK11 2 1 3

FL1 DSS9ND31H223Q91J

R123 2.2k

CD

CS

D +3. 3 L17 470uH(TSL1112SRA-471KR72)

Q10 2SA1241-Y

ES IN+

2 5 2 R124 3k(F-rank) C160 470/6.3 R125 1.8k(F-rank) D D D

GND

CT

D C161 150p D9 SS14

4

D

3

D10 1 2 1N4004

R126 10 (0805size) R127 1.5k C162 470/35 R158 N.I.U.(miniSMDC075) 2

Q11 2SD1758 2 3

D + 12

1

C163 0.1 C165 100/16

C164 100/16

D11 RD13ESAB2 1

2

1

D12 RD13ESAB2 C166 470/35 D13 2 1 1N4004 R159 N.I.U.(miniSMDC075) R129 10 (0805size) 1

D C167 100/16 1 C168 0.1 3 Q12 2SB1182 - 12 C169 100/16

R128 1.8k 2

1

C156 N.I.U.

R119 1.5k

31

Dec.2004

GT-8

CIRCUIT DIAGRAM (MAIN SHEET 2/3) (Jack)
fig.c-main-jack.eps
C1 0.01 R1 1.2k C2 N.I.U + 12 C3 10P A + 12 DA1 2 JK1 GUITAR IN HTJ-064-12i A 8 A A + 6 5 + A JK2 HTJ-064-12D HEADPHONES 2 3 1 C174 N.I.U. A L4 N.I.U.(0) C175 N.I.U. L5 N.I.U.(0) 2 4 1 HTJ-064-12i A A A A JK4 OUT R HTJ-064-12i 2 4 1 A A A C46 0.01 R43 1.2k C47 N.I.U. A L6 N.I.U.(0) R33 1k R34 1k C41 7 100/16 R36 1 2 10K A R40 330 C43 150P 3 IC6B M5216F 3 A 20 10 VR1B RK09K12A0 (50kAx2) R22 1k A C28 10/16 R24 100k Q3 RN1441-A 2 Q1 RN1441-A 2 R131 N.I.U.(0) L3 N.I.U.(0) R130 N.I.U.(0) 3 7 IC1B M5238FP IC1C M5238FP 4 C10 0.1 R9 6.8K(F) A C173 N.I.U 6 7 C11 0.1 R11 N.I.U.(0) + A R12 10K 1 R15 47/2W C18 47/16 C19 0.1 C21 0.001 1 2 R18 A C24 R23 1k C29 100/16 R25 1 10K A R26 330 C33 0.001 R29 C35 + R28 10K 47K 10p 6 5 C179 N.I.U C201 1/50(NP) C32 150P 1 47K 10p 2 3 12 C177 N.I.U 1 23 A VR1A RK09K12A0 (50kAx2) R32 47K C38 47/16 22 2 C200 1/50(NP) 13 3 A R27 82K 1 Q13 RN1441-A A R161 1k C39 47/16 7 C34 10P R30 N.I.U.(0) + IC5B M5218AFP A 1 Q14 RN1441-A A - 12 D 2 A IC6C M5216F 4 6 5 C178 N.I.U C42 N.I.U. R31 10K C36 47/16 8 C37 10/16 + C44 10/16 A + IC5C M5218AFP 4 C195 N.I.U. A 2 + 12 + 12 8 R21 47K C26 47/16 R160 1k C27 47/16 1 C23 10P R19 N.I.U.(0) + IC5A M5218AFP A A A D 2 3 C176 N.I.U C30 N.I.U. R20 10k C25 47/16 A C31 0.1 D R14 10K + 4 8 C17 100/16 IC2C NJM2100M A A R17 10K R10 10 C13 0.1 R16 82K C14 10/16 C20 0.1 C199 N.I.U. A C12 10/16 5 + IC2B NJM2100M 2 4 1 C172 10p L1 N.I.U.(0) R6 10K 3 N.I.U 1 - 12 R2 10k D1 1SS352 R3 18K 2 2 C170 N.I.U R7 1M 3 + C4 47/16 1 IC1A M5238FP + 12 C9 0.1 C171 N.I.U A R5 100K(F) 2 3 + C7 10P R8 12K(F) + L2 N.I.U.(0) 4 5 3 VA VD VSS VCOM 14 C15 10/16 C16 0.1 C8 N.I.U.(0) 1 1 C196 N.I.U. R4 12K(F) IC2A NJM2100M C6 N.I.U.(0) 2 1 15 16 IC3 AK4552VT LIN RIN LOUT ROUT MCLK SDTO BCLK LRCK SDTI PDN DEM0 DEM1 11 8 12 10 9 13 6 7 D MCK GUITAR_IN BCK LRCK MASTER XRESET

C5 0.47(ECPU1C474MA5)

- 12 R13 47/2W

A

A

A 3

A

D A C22 0.1 D A D

Q2 RN1441-A

JK3 OUT L (MONO)

+ IC6A M5216F

3

D +3. 3 1 D2 1SS352

C40 10/16 R35 100k Q4 RN1441-A

D +3. 3 2

D +3. 3 R37 47k 1 R39 47k MUTE

C45 470/6.3

2

- 12

- 12

R38 47k 1

A

3

Q6 2SA1586GR

3

R41 10k

Q5 2SA1586GR R42 10K

A + 12 2 L7 N.I.U.(0) 2 4 1 HTJ-064-12i A C182 N.I.U. R132 N.I.U. R49 10K 3 DA2 N.I.U. 1

R45 10k

R46 18k

C48 10P R47 12K(F) C52 10P IC9 AK4552VT 2 C181 N.I.U R51 N.I.U.(0) R53 10K R58 6.8k(F) R57 10K C184 N.I.U A C57 0.1 C58 47/16 4 6 5 + 7 IC8B NJM2100M C61 0.1 C62 10/16 3 1 IC8A NJM2100M C51 47/16 C53 47/16 8 R55 12K(F) 2 1 15 16 3 + LIN RIN LOUT ROUT MCLK SDTO BCLK LRCK SDTI PDN DEM0 DEM1 11 8 12 10 9 13 6 7 D VCOM 14 C65 10/16 A D C63 C64 0.1 10/16 A A C66 0.1 R62 33k C68 10p R65 47k C67 0.001 R66 10k R56 33k C183 N.I.U 6 5 + 7 MCK RETURN BCK LRCK SEND XRESET C59 10/16

R44 470k

D

1

- 12 D3 1SS352 C50 10/16 2

JK5 RETURN

C180 N.I.U

2 3 +

C49 47/16 1 IC7A M5218AFP +

R48 100K(F)

- 12 R52 10k C55 0.001

R50 220k

R54

47k

C54 10P

A

A

A

+

L8 N.I.U.(0) R59 10 4 5 VA VD VSS

C56 N.I.U.

+

R162 1K 3

R60 1K 3

C60 10/16

R61 1K

L9 N.I.U.(0) 2 4 1

JK6 SEND HTJ-064-12i

IC7B 1 M5218AFP

1 2 2

A

A IC8C NJM2100M

R63 100K

R64 100K

A

A Q15 RN1441-A

A Q7 RN1441-A

A

A

A

+ 12 8 + 4 IC7C M5218AFP - 12

33

Dec.2004

GT-8

CIRCUIT DIAGRAM (MAIN SHEET 2/3) (Digital)
fig.c-main-digital.eps
D +3. 3 20 C69 0.1 IC39 TC7SH04FU 4 D15 D14 D13 D12 D11 D10 D9 D8 D15 D14 D13 D12 D11 D10 D9 D8 D +3. 3 D +5 2 RA1 CRN34103J 8 7 6 5 D C198 0.1 20 RA2 CRN34103J 8 7 6 5 C70 0.1 RA3 CRN34101J 1 2 3 4 1 2 3 4 D 1 2 3 4 1 2 3 4 8 7 6 5 8 7 6 5 Data Bit 7 Data Bit 6 Data Bit 5 Data Bit 4 Data Bit 3 Data Bit 2 Data Bit 1 Data Bit 0 Enable signal Read/Write Resister Select Contrast Q7 Q6 Q5 Q4 Q3 Q2 Q1 Q0 12 13 14 15 16 17 18 19 R133 N.I.U.(0) R151 N.I.U 5 D +3. 3 AD_C AD_B AD_A SW_SCAN4 SW_SCAN3 SW_SCAN2 SW_SCAN1 SW_SCAN0 Q7 Q6 Q5 Q4 Q3 Q2 Q1 Q0 VCC D +5 D +3. 3 D 12 13 14 15 16 17 18 19 D7 D6 D5 D4 D3 D2 D1 D0 OE CK 9 8 7 6 5 4 3 2 1 11 D D R137 N.I.U.(0) D +3. 3 20 C74 0.1 A2 A1 A0 3 2 1 5 4 6 C B A G2B G2A G1 16 D Y7 Y6 Y5 Y4 Y3 Y2 Y1 Y0 7 9 10 11 12 13 14 15 IC13 TC74VHC138F D D7 D6 D5 D4 D3 D2 D1 D0 OE CK VCC 1 11 D D IC14 TC74VHC574FT(EL) R70 2.2k D D10 D9 D8 D +3. 3 9 8 7 6 5 4 3 2 1 11 R142 10k D R76 10k D 7 R74 N.I.U. Q7 Q6 Q5 Q4 Q3 Q2 Q1 Q0 12 13 14 15 16 17 18 19 C76 0.1 IC15 TC74VHCT574AF D C187 0.01 D +3. 3 C72 0.1

TO LCD
CN1 A2541WR2-2A16NP 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 R72 CONTRAST 10K D C79 0.1 D R75 330

1 4 D +3. 3 D +5 D +5 7 C194 N.I.U. C193 N.I.U. C186 0.1 4 D D D GND VCC 6 D +5 NC NC NC NC DLY 1 2 3 8 5 2 C185 0.1 D14 1SS352 1 D 2 3 IC33 TC7SH32FU

5

R134 10k

3

RST

IC11 TC74VHC574FT(EL)

9 8 7 6 5 4 3 2 1 11

GND

D7 D6 D5 D4 D3 D2 D1 D0 OE CK

10

VCC

D +3. 3

VCC

GND

IC34 M51953AFP D +3. 3 5

C189 0.33/50

RA4 CRN34101J IC12 TC74VHCT574AF D

D D 12 13 14 15 16 17 18 19 Q7 Q6 Q5 Q4 Q3 Q2 Q1 Q0 D7 D6 D5 D4 D3 D2 D1 D0 OE CK 9 8 7 6 5 4 3 2 VCC

10

R69 470 3 2 D Q8 2SC4116GR 1

5V(or 3.3V)
C75 0.1 RA5 CRN34104J 4 3 2 1 1 2 3 4 8 7 6 5 RA6 CRN34101J 5 6 7 8

VSS VDD

DS NC

OUT

3

8

R138 N.I.U IC17 N.I.U.(S-80130ALMC-JAP-T2)

LED_CLOCK LED_DATA3 LED_DATA2 LED_DATA1 LED_DATA0

GND

1

4

C71 0.1

2

XRESET
D

MIDI
JK7 YKF51-5054 2 C78 N.I.U. L11 N1608Z601T01 L12 N.I.U.(0) L13 N.I.U. 6 L10 N1608Z601T01 14 12 15 R71 120 R73 100 1 IC16 PC400 1 D4 1SS352 D +3. 3 2 3 3 DA3 N.I.U 1 1 5 IC18A TC7W04F D +3. 3 C77 0.1

D +3. 3

10

GND

5 D

D +3. 3

D +3. 3

R141 10k

IN

5

2

D +3. 3 R77 22(1/2W)

24 22 25

OUT

2

4

3 IC18B TC7W04F D +3. 3

10

4

4

GND

20

D +3. 3

D XRESET

5

L14 N.I.U.(0) 30 40 50 60

D

R79 22

R78 4.7K ENC_B C87 0.1

R80 1K XB C80 0.1 D +3. 3 R155 R82 R83 4 3 2 1 XA RA7 CRN34103J C103 0.1 A17 A16 A15 A14 A13 A12 A11 A10 A9 A8 A7 A6 A5 A4 A3 A2 A1 48 1 2 3 4 5 6 7 8 18 19 20 21 22 23 24 25 12 26 28 11 14 15 13 A16 A15 A14 A13 A12 A11 A10 A9 A8 A7 A6 A5 A4 A3 A2 A1 A0 CE2 CE1 OE WE UB LB IC I/O16 I/O15 I/O14 I/O13 I/O12 I/O11 I/O10 I/O9 I/O8 I/O7 I/O6 I/O5 I/O4 I/O3 I/O2 I/O1 NC NC NC NC NC VCC 45 43 41 39 36 34 32 30 44 42 40 38 35 33 31 29 47 17 16 10 9 37 C121 0.1 GND GND IC19 UPD442012AGY-BB85X-MJH R89 10k BATT 4 46 27 D 2 D6 1 1SS352 R88 10k BT2 N.I.U(BH-32) ESP_INT0 2 2 D +3. 3 1 10K 10K 10K 5 6 7 8 A20 A19 A18 A17 A16 A15 A14

D +3. 3 C83 C88

C81 0.1 C85 0.1 C90 0.1 C95 0.1 C99 0.1 C104 0.1 C108 0.1 C112 0.1

10/16 0.1

D +3. 3 C84 C89 0.1

C82 C86 0.1 C91 C94 0.1 C96 C98 0.1 C100 C102 0.1 C105 C107 0.1 C109 C111 0.1 C113 C115 0.1

10/16 0.1 0.1 0.1 0.1 0.1 0.1 0.1

D +3. 3 D CN2 A2001WR2-12P 1 2 3 4 5 6 7 8 9 10 11 12 1 2 3 4 5 6 7 8 9 10 11 12 C92 10/16

IC18C TC7W04F 2 6

IC18D TC7W04F

8

0.1 0.1 0.1 0.1 0.1 0.1 1 11 26 37 51 73 90 101 109 120 140 18 59 93 128

4

D D +3. 3 D

D +3. 3

C93 C97

ENCODER

D R81 4.7K R84 1K

D LED_DATA3 LED_CLOCK SW_SCAN0 SW_DATA6 SW_DATA5 SW_DATA4 SW_DATA3 SW_DATA2 SW_DATA1 SW_DATA0 D +3. 3 R86 100

C101 A18 C106

LED DATA
RA8 CRN34104J RA9 CRN34101J 1 2 3 4 5 6 7 8 R85 100k 4 3 2 1 ENC_A

2M SRAM
D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0

C110 C114 1 11 26 37 51 73 90 101 109 120 140 18 59 93 128

TO CN5 on SW2 BOARD

VDD5 VDD5 VDD5 VDD5 VDD5 VDD5 VDD5 VDD5 VDD5 VDD5 VDD5

VDD3 VDD3 VDD3 VDD3

VDD5 VDD5 VDD5 VDD5 VDD5 VDD5 VDD5 VDD5 VDD5 VDD5 VDD5

C116 C117 C118 10/16 100 D 42 67 C120

0.1 0.1 0.1 D R87 10K D +3. 3

LED_CLOCK

CN3 A2001WR2-8P 1 2 3 4 5 6 7 8

C119 10/16

1 D 2 3 4 5 LED_DATA2 6 LED_DATA1 7 LED_DATA0 8 LED_CLOCK

TO CN7 on SW1 BOARD

ENC_B ENC_A 15 14 13 12 11 10 8 7 6 5 95 RA15 CRN34101J 4 5 3 6 2 7 1 8 4 5 3 6 2 7 1 8 D +3. 3 4 C123 1 2 3 4 1 2 3 4 RA22 CRN34103J 15P 65 69 1 68 R93 10 79 80 88 87 86 85 84 83 82 81 89 D 62 C131 C132 10/16 0.1 C134 0.01 R109 N.I.U.(0) 63 60 59 D D +3. 3 66 STBY MD2 MD1 MD0 NMI EXTAL XTAL 94 93 92 91 61 58 57 56

IRQ5/SCK1/P35 IRQ4/SCK0/P34 RXD1/P33 RXD0/P32 TXD1/P31 TXD0/P30 P17/TIOCB2/TCLKD P16/TIOCA2 P15/TIOCB1/TCLKC P14/TIOCA1 PG0/ADTRG/IRQ6 P27/TIOCB5/TMO1 P26/TIOCA5/TMO0 P25/TIOCB4/TMCI1 P24/TIOCA4/TMRI1 P23/TIOCD3/TMCI0 P22/TIOCC3/TMRI0 P21/TIOCB3 P20/TIOCA3

SW SCAN
CN4 A2001WR2-13P 1 2 3 4 5 6 7 8 9 10 11 12 13 1 2 3 4 5 6 7 8 9 10 11 12 13 SW_SCAN4 SW_SCAN3 SW_SCAN2 SW_SCAN1 SW_DATA7 SW_DATA6 SW_DATA5 SW_DATA4 SW_DATA3 SW_DATA2 SW_DATA1 SW_DATA0 8 7 6 5 8 7 6 5 RA21 CRN34103J SW_SCAN0 SW_SCAN4 SW_SCAN3 SW_SCAN2 SW_SCAN1

TO CN8 on SW1 BOARD

P13/A23/TIOCD0/TCLKB P12/A22/TIOCC0/TCLKA P11/A21/TIOCB0 P10/A20/TIOCA0 A19 A18 A17 A16 A15 A14 A13 A12 A11 A10 A9 A8 A7 A6 A5 A4 A3 A2 A1 A0 D15 D14 D13 D12 D11 D10 D9 D8 D7/PE7 D6/PE6 D5/PE5 D4/PE4 D3/PE3 D2/PE2 D1/PE1 D0/PE0 PF7/PHAI PF6/AS PF5/RD PF4/HWR PF3/LWR/IRQ3 PF2/WAIT/IRQ2 RES

2

RA18 CRN34101J X2 MA-406 (24MHz) C125 15P

D

SW DATA
D +3. 3

D DA4 1SS302 1 D R96 4.7K MUTE MUTE CONTRAST BATT

EXP /CTL 1, 2
JK8 2 3 1 HTJ-064-12D

D +3. 3 R94 2 470k R95 4.7K

D +3. 3 D

D +3. 3 R100D +3. 3 4.7k 2 D R101 4.7K DA5 1SS302 1

C130 0.001

AVCC VREF P47/AN7/DA1 P46/AN6/DA0 P45/AN5 P44/AN4 P43/AN3 P42/AN2 P41/AN1 P40/AN0 AVSS

3

32 31 30 29 28 27 26 25 24 23 22 21 19 18 17 16 71 72 73 74 75 76 64 77 78 96 97 98 99

1 2 3 4 1 2 3 4 1 2 3 4 1 2 3 4

8 7 6 5 8 7 6 5 8 7 6 5 8 7 6 5

RA19 N.I.U.(0) RA20 N.I.U.(0) RA23 N.I.U.(0) RA24 N.I.U.(0)

D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0

IC23B TC75S51F

5

4 3 2 1 55 54 53 52 50 49 48 47 46 45 44 43 41 40 39 38 37 36 35 34

ESP_INT0 R147 1 2 3 4 1 2 3 4 1 2 3 4 1 2 3 4 1 2 3 4 N.I.U.(0) 8 7 6 5 8 7 6 5 8 7 6 5 8 7 6 5 8 7 6 5 A20 A19 A18 A17 A16 A15 A14 A13 A12 A11 A10 A9 A8 A7 A6 A5 A4 A3 A2 A1 A0 4 5 9 10 IC26C TC74HC08AF 8 IC26B TC74HC08AF 6

D5 RB500V-40 2

A13 A12 A11 A10 A9 A8 A7 A6 A5 A4 A3 A2 A1 A0 D15 D14 D13 D12 D11 D10 D9 D8

81 82 83 84 86 87 88 89 91 92 94 95 96 97 99 100 102 103 104 105 106 107 74 75 77 78 79

RA10 N.I.U.(0) RA11 N.I.U.(0) RA12 N.I.U.(0) RA13 N.I.U.(0) RA16 N.I.U.(0)

CA13 CA12 CA11 CA10 CA9 CA8 CA7 CA6 CA5 CA4 CA3 CA2 CA1 CA0 CD7 CD6 CD5 CD4 CD3 CD2 CD1 CD0 INT1 INT0 CS WR RD DIRECT CTYPE EAMPX RFRSH PWRSAV GRAMC SHRMD OSC DA7 DA6 DA5 DA4 DA3 DA2 DA1 DA0 AD3 AD2 AD1 AD0 LRCK1 LRCK0 BCK1 BCK0 MCK1 MCK0 XTESTT XTESTS TESTB

TRR5 TRR4 TRR3 TRR2 TRR1 TRR0 TRCKIN RST2 RST1 VPOUT TRS5 TRS4 TRS3 TRS2 TRS1 TRS0 TRCKO SYO SYI EA9 EA8 EA7 EA6 EA5 EA4 EA3 EA2 EA1 EA0 ED23 ED22 ED21 ED20 ED19 ED18 ED17 ED16 ED15 ED14 ED13 ED12 ED11 ED10 ED9 ED8 ED7 ED6 ED5 ED4 ED3 ED2 ED1 ED0 WE CAS RAS

63 62 61 60 58 57 56 52 53 54 110 111 112 113 114 115 117 142 143 D 28 27 25 24 23 21 20 19 17 16 50 49 48 47 46 45 43 42 41 40 39 38 35 34 33 32 10 9 8 7 5 4 3 2 12 13 14

TRR5 TRR4 TRR3 TRR2 TRR1 TRR0

TRS5 TRS4 TRS3 TRS2 TRS1 TRS0

A13 A12 A11 A10 A9 A8 A7 A6 A5 A4 A3 A2 A1 A0 D15 D14 D13 D12 D11 D10 D9 D8

81 82 83 84 86 87 88 89 91 92 94 95 96 97 99 100 102 103 104 105 106 107 74 75 77 78 79

VDD3 VDD3 VDD3 VDD3

8 7 6 5

LED_DATA3 LED_DATA2 LED_DATA1 LED_DATA0

D

D

D +3. 3

D

CA13 CA12 CA11 CA10 CA9 CA8 CA7 CA6 CA5 CA4 CA3 CA2 CA1 CA0 CD7 CD6 CD5 CD4 CD3 CD2 CD1 CD0 INT1 INT0 CS WR RD DIRECT CTYPE EAMPX RFRSH PWRSAV GRAMC SHRMD OSC DA7 DA6 DA5 DA4 DA3 DA2 DA1 DA0 AD3 AD2 AD1 AD0 LRCK1 LRCK0 BCK1 BCK0 MCK1 MCK0 XTESTT XTESTS TESTB

TRR5 TRR4 TRR3 TRR2 TRR1 TRR0 TRCKIN RST2 RST1 VPOUT TRS5 TRS4 TRS3 TRS2 TRS1 TRS0 TRCKO SYO SYI EA9 EA8 EA7 EA6 EA5 EA4 EA3 EA2 EA1 EA0 ED23 ED22 ED21 ED20 ED19 ED18 ED17 ED16 ED15 ED14 ED13 ED12 ED11 ED10 ED9 ED8 ED7 ED6 ED5 ED4 ED3 ED2 ED1 ED0 WE CAS RAS

63 62 61 60 58 57 56 52 53 54 110 111 112 113 114 115 117 142 143 28 27 25 24 23 21 20 19 17 16 50 49 48 47 46 45 43 42 41 40 39 38 35 34 33 32 10 9 8 7 5 4 3 2 12 13 14

TRS5 TRS4 TRS3 TRS2 TRS1 TRS0

VCC

VCC

VCC

TRR5 TRR4 TRR3 TRR2 TRR1 TRR0

RA14 CRN34103J RA17 CRN34103J 1 8 2 7 3 6 4 5 1 8 2 7 3 6 4 5 D +3. 3

+

3 1

R90 1M(F)

IC24 28 27 26 25 24 21 20 19 18 13 14 17 32 A8 A7 A6 A5 A4 A3 A2 A1 A0 NC NC NC NC I/O16 I/O15 I/O14 I/O13 I/O12 I/O11 I/O10 I/O9 I/O8 I/O7 I/O6 I/O5 I/O4 I/O3 I/O2 I/O1 VCC VCC VCC 43 42 41 40 38 37 36 35 10 9 8 7 5 4 3 2 22 6 1

D +3. 3

IC23A TC75S51F

1

1

R91 4.7M(F)

BT1 BCR20H4 D

+

C122 0.1

D

D +3. 3 D +3. 3 X1 4 VDD OE 1

65 66 67 68 69 70 71 D 30 118 119 121 122 123 125 126 127 129 130 132 133 134 135 137 138 139 141

D +3. 3

65 66 67 68 69 70 71 D 30 118 119 121 122 123 125 126 127 129 130 132 133 134 135 137 138 139 141

D 2 GND OUT 3

ED7 ED6 ED5 ED4 ED3 ED2 ED1 ED0 D +3. 3

8M Flash
A19 A18 A17 A16 A15 A14 A13 A12 A11 A10 A9 A8 A7 A6 A5 A4 A3 A2 A1 D +3. 3 1 3 2 IC26A TC74HC08AF CN7 26 11 28 47 15 12 CE WE OE BYTE RY/BY RESET 16 17 48 1 2 3 4 5 6 7 8 18 19 20 21 22 23 24 25 A18 A17 A16 A15 A14 A13 A12 A11 A10 A9 A8 A7 A6 A5 A4 A3 A2 A1 A0 DQ15/A-1 DQ14 DQ13 DQ12 DQ11 DQ10 DQ9 DQ8 DQ7 DQ6 DQ5 DQ4 DQ3 DQ2 DQ1 DQ0 NC NC NC NC VCC 45 43 41 39 36 34 32 30 44 42 40 38 35 33 31 29 9 10 13 14 37 C136 0.1 VSS VSS 27 46 D C137 10/16 D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0

C124 0.1

D

SG-8002JC(67.7376MHz)

R146 N.I.U.(0) MASTER R103 N.I.U.(0) GUITAR_IN

R144 N.I.U.(0) SEND

R97 R98 R99

N.I.U.(0) N.I.U.(0) N.I.U.(0)

R145 N.I.U.(0) RETURN

D 3 D R102 4.7K

D WDTOVF(FWE*) PF1/BACK/IRQ1/CS5 PF0/BREQ/IREQ0/CS4 PG1/CS3/IRQ7/CS6 PG2/CS2 PG3/CS1/CS7 PG4/CS0 D +3. 3

ED7 ED6 ED5 ED4 ED3 ED2 ED1 ED0

16 30 31 15 29 D

RAS UCAS LCAS WE OE

C129 10/16 VSS VSS VSS 44 39 23 D C128 0.1

LC32V4265CT-25-TLM-E C126 C127 0.1 0.1

R104 N.I.U.(0)

LRCK BCK MCK

R105 N.I.U.(0) R107 N.I.U.(0)

C133 0.1

R106 N.I.U

D

TO CN1 on EXP BOARD

CN5 1 2 3 1 2 3

D +3. 3 R110 1K

D

D +3. 3

R108 N.I.U.(0) D +3. 3

76 131 31

D +3. 3

76 131 31

VSS

VSS

VSS

VSS

VSS

VSS

VSS VSS VSS VSS VSS VSS VSS VSS VSS VSS VSS VSS VSS VSS VSS VSS VSS

C138 0.1 D D D

20

33

51

70

90

6 15 22 29 36 44 55 64 72 80 85 98 108 116 124 136 144

IC22 HD6412312SVF

1 2

1 2

IC25 MBM29LV800BA-70PFTN-SFKE1 A20 A20 A19 A18 A17 A16 A15 A14 A13 A12 A11 A10 A9 A8 A7 A6 A5 A4 A3 A2 A1 A0 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 TP1 TP3 TP5 TP7 TP9 TP11 TP13 TP15 TP17 TP19 TP21 TP23 TP25 TP27 TP29 TP31 TP33 TP34 TP35 TP37 TP39 TP40 TP42 TP44 TP2 TP4 TP6 TP8 TP10 TP12 TP14 TP16 TP18 TP20 TP22 TP24 TP26 TP28 TP30 TP32 TP36 TP38 TP41 TP43 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1

D D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0 D +3. 3 R156 10k CDIN XDCS DCCLK D_CDOUT XDOUT_RESET DINT

C140 CN6 1 2 3 4 5 6 7 1 2 3 4 5 6 7 D 1 2 3 4 0.1 D AD1 AD0 D +3. 3 8 7 6 5 C139 0.1 7 RA25 N.I.U. D AD_C AD_B AD_A R115 470 IC37 2 3 1 HTJ-064-12D 4 3 N.I.U 4 C188 0.01 3 TLP172A IC38 D 1 2 2 3 1 2 Q9 2SC4738 1 R117 47k C192 N.I.U. R116 100k D +3. 3 D +3. 3 14

D

D +3. 3

D +3. 3 D +3. 3 IC35 TC7SH04FU 4 5 1 4 2 3 D 5

D +3. 3 C141 10/16 D +3. 3 D +3. 3 C142 10/16 5

R148 10k IC26E TC74HC08AF 12 13 IC26D TC74HC08AF 11 2 C190 0.1

C145 0.1 C146 47/16

6 15 22 29 36 44 55 64 72 80 85 98 108 116 124 136 144 D TR1 PT-10(2280-T008) R113 75 6 4 20 L15 SBT-0180W 4 3 C197 270p 2 1 2 1 A D 10 D C148 N.I.U. D R114 47k JK9B YKC21-3117 10

9

A2001WR2-3P

VSS VSS VSS VSS VSS VSS VSS VSS VSS VSS VSS VSS VSS VSS VSS VSS VSS

C135 0.01

IC20 RA0A-101 (TC223C080AF-101)

IC21 RA0A-101 (TC223C080AF-101)

TO CN9 on SW1 BOARD

DIGITAL OUT
JK9A YKC21-3117

R111 D 23 C143 0.1 C144 0.1 D 150

3

D 2 3 4 IC28 TC7SH04F D

R112 N.I.U.(0) C147 0.1

D +3. 3 C191 0.1 R149 10k D IC36 TC7SH32FU

D +3. 3

PANEL VR A/D

12 13 14 21 3 27 2 28 1 9 19 15 10 11 16 4 5

VD

VL

A2001WR2-7P

6

1 2 3

ILRCK ISCLK SDIN OMCK

TXP TXN U/TEST

26 25 20 18

AMP CONTROL
JK10

D

D

D D D

1 2 3 4

22

RA26 CRN34103J

R153 10k

R154 10k

TEST/U AD2/EPMH AD1/CDIN/TEST AD0/CS/TEST SCL/CCLK/ORIG TEST/V SDA/CDOUT/COPY/C RST INT/AUDIO TCBL H/S TEST/APMS TEST/TCBLD TEST/CEN RXP/SFMT0 TEST DGND/SFMT1 TEST DGND IC27 CS8406-CZ ZR

17

24

7 8

8 7 6 5

D

35

Dec.2004

GT-8

CIRCUIT BOARD (SW SHEET)
fig.b-sw.eps

View from components side

37

Dec.2004

GT-8

CIRCUIT DIAGRAM (SW SHEET)
fig.c-sw.eps

TO CN5 ON MAIN BOARD

"1"

"2"
D +3. 3 1 LED2 L-34HDSL 2

"3"
D +3. 3 1 LED3 L-34HDSL 2

"4"
D +3. 3 1 LED4 L-34HDSL 2

"CTL"
D +3. 3 1 LED5 L-34HDSL 2 R5 390 CN2 RIBON 7P (1/2) D +3. 3 1 2 3 4 5 6 7 1 2 3 4 5 6 7 1 2 3 4 5 6 7 1 2 3 4 5 6 7 SW_SCAN0 CN3 RIBON 7P (1/2) D +3. 3

BANK DOWN
D +3. 3 1 LED6 L-34HDSL 2

BANK UP
D +3. 3 1 LED7

EXP PEDAL FX ON/OFF
D +3. 3 1 LED8 L-34HDSL 2 R8 390

EXP BOARD ASSY 75D913S000 (6/6)
CN1 WIRING 3P 1 2 3 1 2 3 D

D +3. 3 C7 0.1 D +3. 3 16 IC1 BU2090 (DIP) 2 Q11 Q10 Q9 Q8 Q7 Q6 Q5 Q4 Q3 Q2 Q1 Q0 15 14 13 12 11 10 9 8 7 6 5 4 1 LED1 L-34HDSL R1 390

VDD

D+3V
13 12 11

L-34HDSL 2 R7 390

VR1A RK11K1140 (10KSB) 14 2 3 DATA CLOCK

R2 390

R3 390

R4 390

R6 390

DGND
VSS 1

SW_DATA5 SW_DATA6

BANK DOWN
SW1 1 D1 1SS133 2 1 2 1

BANK UP
SW2 2 1 D2 1SS133 2

D

SW2 BOARD ASSY 75D913S000 (2/6)
LED_DATA3 LED_CLOCK D3 1SS133 2 1 2 SW4 1

RIBON CABLE (7P)

SKQKAKD010 SW_DATA5 SW_DATA6

SKQKAKD010

ENC BOARD ASSY 75D913S000 (5/6)
1 10 EN A B 1 2 3 EN1A EVE GC1 F20 24B 20 EN B

SW3

"1"

"2"

D4 1SS133 2 1 2

SW5 1

"3"

D5 1SS133 2 1 2

SW6 1

"4"

D6 1SS133 2 1 2

SW7 1

"CTL"

D7 1SS133 2 1 2

SW3 BOARD

ASSY 75D913S000 (3/6)

SKQKAKD010

SKQKAKD010

SKQKAKD010

SKQKAKD010

SKQKAKD010 SW_SCAN0 D +3. 3 SW_DATA4 SW_DATA3 SW_DATA2 SW_DATA1 SW_DATA0 12 11 10 9 8 7 6 5 4 3 2 1 D

A EN1B EVE GC1 F20 24B

C8 N.I.U.

DGND
CN4 RIBON 3P (1/2)

1 2 3

PRE/SP CHANNEL A LED12 L-312LRD D +3. 3 1 C1 D +3. 3 0.1 IC2 BU2090 (DIP) Q11 Q10 Q9 Q8 Q7 Q6 Q5 Q4 Q3 Q2 Q1 Q0 15 14 13 12 11 10 9 8 7 6 5 4

PRE/SP LED10 L-312LRD D +3. 3 1

OD/DS LED11 L-312LRD D +3. 3 1

PRE/SP CHANNEL B LED13 L-312LRD D +3. 3 1

DELAY LED14 L-312LRD D +3. 3 1

PRE/SP SOLO LED15 L-312LRD D +3. 3 1

DELAY TAP LED16 L-312LRD D +3. 3 1

COMP LED20 L-312LRD D +3. 3 1

CHORUS LEVEL LED18 L-312LRD D +3. 3 1

REVERB LEVEL LED19 L-312LRD D +3. 3 1

1 2 3

CN5 WIRING 12P

RIBON CABLE (3P)
CN6 RIBON 3P (1/2) 1 2 3 1 2 3

12 11 10 9 8 7 6 5 4 3 2 1

TO CN3 ON MAIN BOARD

D

D +3. 3 CN7 WIRING 8P 1 2 3 4 5 6 7 8 1 2 3 4 5 6 7 8 C9 N.I.U.

D

LED_DATA0
2 3 DATA CLOCK

1

VSS

D

VDD

16

TO CN2 ON MAIN BOARD

2

2

2

2

2

2

2

2

2

R12 390

R10 390

R11 390

R13 390

R14 390

R15 390

R16 390

R20 390

R18 390

2 R19 390 TUNER/ BYPASS LED29 L-312LRD D +3. 3 1 MANUAL LED30 L-312LRD D +3. 3 1 R29 390 2 R30 390 D +3. 3 DIG2 13 9 DP 2

D [PRE/SP] SW8 1 2 1 SW_SCAN4 SKQKAB [PRE/SP TYPE VARIATION] SW9 D9 1 2 1 2 SKQKAB 1SS133 [PRE/SP CHANNEL A] SW10 D10 1 2 1 2 SKQKAB 1SS133 [PRE/SP CHANNEL B] SW11 D11 1 2 1 2 SKQKAB 1SS133 [PRE/SP SOLO] SW12 D12 1 2 1 2 SKQKAB [COMP] SW20 1 2 1 SKQKAB 1SS133 D20 2 1SS133 1 [PRE/SP SPEAKER] SW13 D13 1 2 1 2 SKQKAB [EQ] SW21 2 1 SKQKAB 1SS133 D21 2 1SS133 1 [OD/DS] SW14 1 2 1 SKQKAB [WAH] SW22 2 1 SKQKAB [OD/DS TYPE VARIATION] D15 SW15 1 2 1 2 SKQKAB [LOOP] SW23 1 2 1 SKQKAB [EXIT] SW31 1 2 1 SKQKAB [MANUAL] SW39 2 1 SKQKAB SW_DATA1 1SS133 D23 2 1SS133 2 2 2 2 2 2 2 D31 2 1SS133 D39 2 3 SW_SCAN1 SKQKAB 1SS133 SW_DATA7 SKQKAB 1SS133 SW_DATA6 SKQKAB 1SS133 SW_DATA5 SKQKAB 1SS133 SW_DATA4 SKQKAB 1SS133 SW_DATA3 SKQKAB 1SS133 SW_DATA2 SKQKAB 1SS133 1SS133 SW_DATA0 IC3 BU2090 (DIP) Q11 Q10 Q9 Q8 Q7 Q6 Q5 Q4 Q3 Q2 Q1 Q0 15 14 13 12 11 10 9 8 7 6 5 4 2 R27 390 R28 390 ASSIGN CTL/EXP LED28 L-312LRD D +3. 3 1

D8 2 1SS133

D14 2 1SS133 D22 2 1SS133

EQ LED21 L-312LRD D +3. 3 1 C2 D +3. 3 0.1

WAH LED22 L-312LRD D +3. 3 1

AMP CTL LED25 L-312LRD D +3. 3 1

FX-1 LED24 L-312LRD D +3. 3 1

LOOP LED23 L-312LRD D +3. 3 1

FX-2 LED26 L-312LRD D +3. 3 1

MASTER LED27 L-312LRD D +3. 3 1

TO CN4 ON MAIN BOARD

[DELAY FEEDBACK] SW16 D16 1 2 1 2 SW_SCAN3 CN8 WIRING 13P 1 2 3 4 5 6 7 8 9 10 11 12 13 1 2 3 4 5 6 7 8 9 10 11 12 13 SW_SCAN4 SW_SCAN3 SW_SCAN2 SW_SCAN1 SW_DATA7 SW_DATA6 SW_DATA5 SW_DATA4 SW_DATA3 SW_DATA2 SW_DATA1 SW_DATA0 D SKQKAB [FX-1] SW24 1 2 1 SW_SCAN2 SKQKAB [WRITE] SW32 2 1 1SS133 D24 2 1SS133 D32 2

[DELAY LEVEL] SW17 D17 1 2 1 2 SKQKAB [AMP CTL] SW25 1 2 1 SKQKAB [SYSTEM] SW33 2 1 1SS133 D25 2 1SS133 D33 2

[CHORUS LEVEL] SW18 D18 1 2 1 2 SKQKAB [FX-2] SW26 1 2 1 SKQKAB 1SS133 D26 2 1SS133 D34 2

[REVERB LEVEL] SW19 D19 1 2 1 2 SKQKAB [MASTER] SW27 1 2 1 SKQKAB [NAME] SW35 2 1 1SS133 D27 2 1SS133 D35 2

[PARAMETER LEFT] SW28 D28 1 2 1 2 SKQKAB 1SS133

[PARAMETER RIGHT] SW29 D29 1 2 1 2 SKQKAB 1SS133

[OUTPUT SELECT] SW30 D30 1 2 1 2 SKQKAB 1SS133

D

16

1

1

1

[FX CHAIN] SW34 2 1

1

1

[TUNER/BYPASS] SW36 D36 2 1 2

1

[ASSIGN CTL/EXP] SW37 D37 2 1 2

1

[ASSIGN VARIABLE] SW38 D38 2 1 2

LED_DATA1

2

1

DATA CLOCK

1

VSS

VDD

R21 390

R22 390

R25 390

R24 390

R23 390

R26 390

TO CN6 ON MAIN BOARD

D

LED31 D +3. 3

A-552SR BW

[11detents]
CN9 1 2 3 4 5 6 7 1 2 3 4 5 6 7 RE F +3. 3 C10 N.I.U. 3 D +3. 3 16 C4 0.1 8 D 7 D GND C B A INH VCC IC4 HD74HC4051P COM 7 6 5 4 3 2 1 0 4 2 5 1 12 15 14 13 9 10 11 6 D

PRE/SP PRE/SP TYPE PRESENCE

PRE/SP TREBLE

PRE/SP LEVEL

PRE/SP MIDDLE

PRE/SP GAIN

PRE/SP BASS

PATCH LEVEL
VR9 RD901-40-125F-B54-00D RE F +3. 3 C3 D +3. 3 0.1 C11 N.I.U. D 16 IC5 BU2090 (DIP) Q11 Q10 Q9 Q8 Q7 Q6 Q5 Q4 Q3 Q2 Q1 Q0 15 14 13 12 11 10 9 8 7 6 5 4 1 R38 R39 R44 R40 R41 R42 R33 R34 R35 R43 R37 R36 R31 R32 470 470 470 470 470 470 470 470 470 470 470 470 470 470

3

3

3

3

3

3

3

3

AD1 AD0 AD_C AD_B AD_A

VR3 RD901-40-125F-B54-00D RE F +3. 3 RE F +3. 3

VR5 RD901-40-125F-B54-00D RE F +3. 3

VR7 RD901-40-125F-B54-00D RE F +3. 3 RE F +3. 3

14

DIG1 DP1 G1 A1 B1 E1 A2 B2 E2 F1 F2 12 G2 7 C1 D1 C2 D2 6

RE F +3. 3

RE F +3. 3

16

15

18

11

17

10

1

3

2

4

2 1

2 1

2 1

2 1

2 1

2 1

2 1

2

WIRING 7P

D

D

D

D

D

D

D VDD D

8

5

A F G E D C DP B

VEE

VR2 RD901-40-125F-B54-11D

VR4 RD901-40-125F-B54-00D

VR6 RD901-40-125F-B54-00D

VR8 RD901-40-125F-B54-00D

LED_DATA2
2 3 DATA CLOCK

[11detents]
IC6 HD74HC4051P 3 D +3. 3 16 C5 0.1 8 GND C B A INH VCC COM 7 6 5 4 3 2 1 0 4 2 5 1 12 15 14 13 9 10 11 6 D

OD/DS TYPE

OD/DS LEVEL

OD/DS DRIVE

REVERB LEVEL

DELAY FEEDBACK

DELAY LEVEL

CHORUS LEVEL

VR11 RD901-40-125F-B54-00D RE F +3. 3 3 RE F +3. 3 3 RE F +3. 3 3

VR13 RD901-40-125F-B54-00D RE F +3. 3 3

VR15 RD901-40-125F-B54-00D RE F +3. 3 3 RE F +3. 3 3

1 D 1 D

RE F +3. 3 3

2 1

2 1

2 1

2 1

2 1

2 1

2

D

D

D

D

D

D

7 D

VEE

VR10 RD901-40-125F-B54-11D

VR12 RD901-40-125F-B54-00D

VR14 RD901-40-125F-B54-00D

VR16 RD901-40-125F-B54-00D

SW1 BOARD

ASSY 75D913S000 (1/6)

VSS

39

Dec.2004

ERROR MESSAGES
If you attempt an incorrect operation or if an operation could not be executed, the display will indicate an error message. Refer to this list and take the appropriate action.
fig.09-080d

The memory backup battery inside the GT-8 has run down. (This message will appear when the power is turned on.) Replace the battery as soon as possible.
fig.09-090d

There is a problem with the MIDI cable connection. Check to make sure the cable has not been pulled out or is not shorted.
fig.09-100d

You've attempted to switch patches by rotating the PATCH/VALUE dial, but the Dial function (p. 73) is set to "VALUE Only." If you want to be able to switch patches using the PATCH/VALUE dial, set the Dial function to "PATCH No.& VALUE."
fig.09-110d

More MIDI messages were received in a short time than could be processed correctly.
fig.error

When memory back up battery is not installed in GT-8, the display will indicate "No Battery!!". Please install the new Lithium Battery.

40