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HCD-D60/GR7/GR7J/RX70
SERVICE MANUAL US Model
HCD-D60/RX70

Ver 1.1 2002.11 Canadian Model
AEP Model
UK Model
HCD-RX70

E Model
HCD-GR7/GR7J

Australian Model
HCD-GR7
HCD-D60/ GR7/GR7J/RX70 is the
tuner, deck, CD and amplifier section in
MHC-D60/ GR7/GR7J/RX70. Photo: HCD-RX70



* Dolby noise reduction manufacrured
under license from Dolby Laboratories Model Name Using Similar Mechanism NEW
Licensing corporation. CD Mechanism Type CDM38-5BD29AL
CD
"DOLBY" and the double-D symbol a
Section Base Unit Name BU-5BD29AL
are trademarks of Dolby Laboratories
Licensing Corporation. Optical Pick-up Name KSS-213D/Q-NP
Tape deck Model Name Using Similar Mechanism HCD-H881
Section Tape Transport Mechanism Type TCM-220WR2


SPECIFICATIONS
For the US model Inputs VIDEO/MD IN (phono jacks) : CD player section
AUDIO POWER SPECIFICATIONS voltage 250 mV,impedance 47 System Compact disc and digital audio
POWER OUTPUT AND TOTAL kilo ohms system
HARMONIC DISTORTION: MIX MIC (phone jack): Laser Semiconductor laser
With 8 ohm loads, both channels driven, from sensitivity 1 mV, (=780nm)
70-20,000 Hz; rated 100 watts per channel impedance 10 kilo ohms Emission duration: continuous
minimum RMS power, with no more than Outputs VIDEO/MD OUT (phono jacks) Laser output Max. 44.6 µW*
0.9% total harmonic distortion from 250 : voltage 250 mV impedance *This output is the value mea-
milliwatts to rated output. 1 kilo ohms sured at a distance of 200 mm
Amplifier section PHONES (stereo phone jack) : from the objective lens surface
Continuous RMS power output accepts headphones of 8 ohms or on the Optical Pick-up Block
Canadian model more. with 7 mm aperture.
100+100 watts SPEAKER : accepts impedance of Frequency response 2 Hz - 20 kHz (±0.5 dB)
(8 ohms at 1 kHz, 5% THD) 8 to 16 ohms (D60/RX70) Wavelength 780-790 nm
AEP, German, East European, UK and CIS models accepts impedance of 6 to 16 ohms Signal-to-noise ratio More than 90 dB
55+55 watts (GR7/GR7J) Dynamic range More than 90 dB
(6 ohms at 1 kHz, 10% THD) SURROUND SPEAKER CD OPTICAL DIGITAL OUT
Other models 70+70 watts (US and Canadian models): (Square optical connector jack, rear panel)
(6 ohm sat 1 kHz, 10% THD) accepts impedance of 16 ohms. (Except US model)
Peak music power output (GR7/GR7J) : SUPER WOOFER (GR7/GR7J/ Wavelength 600 nm
1000 watts RX70 : US and Canadian models): Output Level ­18 dBm
Music power output Voltage 1 V, impedance 1 kilo ohm
(AEP, German, East European, UK and CIS model): -- Continued on next page --
95+95 watts
(6 ohms at 1kHz, 10% THD)




COMPACT DISC DECK RECEIVER
9-960-853-12 Sony Corporation
2002K0500-1 Home Audio Company
C 2002.11 Published by Sony Engineering Corporation
Tape player section MEDEL IDENTIFICATION
Recording system 4-track 2-channel stereo ­ BACK PANEL ­
Frequency response 60 - 13,000 Hz (±3 dB), using Sony TYPE I cassette
(DOLBY NR OFF) 60 - 14,000 Hz (±3 dB), using Sony TYPE II cassette
Wow and flutter ±0.15% W. Peak (IEC)
0.1% W.RMS (NAB)
±0.2% W.Peak (DIN)

Tuner section
FM stereo, FM/AM superheterodyne tuner
PARTS No.
FM tuner section
Tuning range
East European and CIS models:
65.0 - 74.0 MHz
87.5 - 108.0 MHz
Other models 87.5 - 108,0 MHz
Antenna terminals 75 ohm unbalanced
Intermediate frequency 10.7 MHz
UKV tuner section (East European and CIS models)
Tuning range 65.0 - 74.0 MHz Polar stereo

AM tuner section
Tuning range MODEL PARTS NO.
US and Canadian models:
530 - 1,710 kHz D60 : US model 4-986-844-7
(with the AM tuning interval set at 10kHz) GR7 : E3 model 4-988-019-0
531 - 1,710 kHz GR7 : E2 model 4-988-019-1
(with the AM tuning interval set at 9 kHz)
GR7 : MY, SP model 4-988-019-2
EA4, E2, Mexican, Australian and Thailand models:
531 - 1,602 kHz GR7 : EA3, TW model/GR7J: EA3 model 4-988-019-3
(with the AM tuning interval set at 9 kHz) GR7 : HK model 4-988-019-4
530 - 1,710 kHz GR7 : AUS model 4-988-019-5
(with the AM tuning interval set at 10 kHz)
AEP, German, East European, UK and CIS models: GR7 : MX model 4-988-019-6
MW 531 - 1,602 kHz GR7 : EA4, SAF, TH model 4-988-019-7
(with the MW tuning interval set at 9 kHz) RX70 : US model 4-986-844-0
LW 153 -279 kHz
RX70 : CND model 4-986-844-1
(with the LW tuning interval set at 3 kHz)
Other models: MW 531 - 1,602 kHz RX70 : AEP, AED, G, UK model 4-986-844-2
(with the MW tuning interval set at 9 kHz) RX70 : CIS, EE model 4-986-844-3
530 - 1,710 kHz
(with the MW tuning interval set at 10 kHz)
SW 5.95 - 17.90 MHz · Abbreviation
(with the SW tuning interval set at 5 kHz) AED : Northern European model
Intermediate frequency 450 kHz AUS : Australian
Antenna AM loop antenna
CND : Canadian
External antenna terminal
E2 : 120 V AC Area in E model
General E3 : 240 V AC Area in E model
Power requirements EA3 : Saudi Arabia
US and Canadian models: EA4 : Israeli
120 V AC, 60 Hz EE : East European
Mexican model: 120 V AC, 50/60 Hz G : German
AEP, German, East European, UK and CIS models: HK : Hong Kong
220 - 230 V AC, 50/60 Hz
MX : Mexican
Australian and South African models:
220 - 240 V AC, 50/60 Hz MY : Malaysia
EA4 and Thailand model: SAF : South African
220 - 240 V AC, 50/60 Hz SP : Singapore
Other models: 110 - 120 V or 220 - 240 V AC, TH : Thailand
50/60 Hz Adjustable with voltage selector TW : Taiwan
Power consumption
US and Canadian models:
195 watts
AEP, German, East European, UK and CIS models:
115 watts
Other models: 135 watts
Dimensions (w/h/d) Approx. 280×330×366 mm
Mass Approx. 9.3 kg

Design and specifications are subject to change without notice.

­2­
CAUTION SAFETY CHECK-OUT
After correcting the original service problem, perform the follow-
Use of controls or adjustments or performance of ing safety check before releasing the set to the customer:
procedures other than those specified herein may Check the antenna terminals, metal trim, "metallized" knobs, screws,
result in hazardous radiation exposure. and all other exposed metal parts for AC leakage.
Check leakage as described below.
This appliance is classified as a CLASS 1 LASER product.
The CLASS 1 LASER PRODUCT MARKING is located on LEAKAGE TEST
the rear exterior. The AC leakage from any exposed metal part to earth ground and
from all exposed metal parts to any exposed metal part having a
return to chassis, must not exceed 0.5 mA (500 microampers.). Leak-
age current can be measured by any one of three methods.
1. A commercial leakage tester, such as the Simpson 229 or RCA
WT-540A. Follow the manufacturers' instructions to use these
instruments.
2. A battery-operated AC milliammeter. The Data Precision 245
Laser component in this product is capable of emitting radiation digital multimeter is suitable for this job.
exceeding the limit for Class 1. 3. Measuring the voltage drop across a resistor by means of a VOM
or battery-operated AC voltmeter. The "limit" indication is 0.75
The following caution label is located inside the unit. V, so analog meters must have an accurate low-voltage scale.
The Simpson 250 and Sanwa SH-63Trd are examples of a pas-
sive VOM that is suitable. Nearly all battery operated digital
multimeters that have a 2 V AC range are suitable. (See Fig. A)


To Exposed Metal
Parts on Set




AC
0.15 µF 1.5 k voltmeter
(0.75 V)




Earth Ground
Fig. A. Using an AC voltmeter to check AC leakage.




SAFETY-RELATED COMPONENT WARNING!! ATTENTION AU COMPOSANT AYANT RAPPORT
COMPONENTS IDENTIFIED BY MARK ! OR DOTTED À LA SÉCURITÉ!
LINE WITH MARK ! ON THE SCHEMATIC DIAGRAMS LES COMPOSANTS IDENTIFIÉS PAR UNE MARQUE !
AND IN THE PARTS LIST ARE CRITICAL TO SAFE SUR LES DIAGRAMMES SCHÉMATIQUES ET LA LISTE
OPERATION. REPLACE THESE COMPONENTS WITH DES PIÈCES SONT CRITIQUES POUR LA SÉCURITÉ
SONY PARTS WHOSE PART NUMBERS APPEAR AS DE FONCTIONNEMENT. NE REMPLACER CES COM-
SHOWN IN THIS MANUAL OR IN SUPPLEMENTS PUB- POSANTS QUE PAR DES PIÈCES SONY DONT LES
LISHED BY SONY. NUMÉROS SONT DONNÉS DANS CE MANUEL OU
DANS LES SUPPLÉMENTS PUBLIÉS PAR SONY.


­3­
TABLE OF CONTENTS SERVICING NOTES
NOTES ON HANDLING THE OPTICAL PICK-UP
Servicing Notes ........................................................................... 4
BLOCK OR BASE UNIT

1. GENERAL ..................................................................... 5 The laser diode in the optical pick-up block may suffer electrostatic
break-down because of the potential difference generated by the
charged electrostatic load, etc. on clothing and the human body.
2. DISASSEMBLY .......................................................... 22
During repair, pay attention to electrostatic break-down and also
use the procedure in the printed matter which is included in the
3. TEST MODE ............................................................... 28 repair parts.
The flexible board is easily damaged and should be handled with
4. MECHANICAL ADJUSTMENTS .......................... 30 care.

5. ELECTRICAL ADJUSTMENTS NOTES ON LASER DIODE EMISSION CHECK
Deck Section ...................................................................... 30
Tuner Section ..................................................................... 33 The laser beam on this model is concentrated so as to be focused on
CD Section ......................................................................... 34 the disc reflective surface by the objective lens in the optical pick-
up block. Therefore, when checking the laser diode emission, ob-
6. DIAGRAMS serve from more than 30 cm away from the objective lens.
6-1. Printed Wiring Board ­Tuner Section­ ............................. 37
6-2. Schematic Diagram ­Tuner Section­ ................................ 38 Notes on chip component replacement
6-3. Printed Wiring Board ­CD Section­ ................................. 41 · Never reuse a disconnected chip component.
6-4. Schematic Diagram ­CD Section­ .................................... 43 · Notice that the minus side of a tantalum capacitor may be dam-
6-5. Printed Wiring Boards ­CD Motor Section­ ..................... 45 aged by heat.
6-6. Schematic Diagram ­CD Motor Section­ ......................... 47
6-7. Printed Wiring Boards ­Deck Section­ ............................. 49 Flexible Circuit Board Repairing
6-8. Schematic Diagram ­Deck Section­ ................................. 51 · Keep the temperature of the soldering iron around 270 °C during
6-9. Schematic Diagram ­Main /Power Section­ ..................... 55 repairing.
6-10. Printed Wiring Boards ­Main /Power Section­ ................. 59 · Do not touch the soldering iron on the same conductor of the
6-11. Schematic Diagram ­Panel Section­ ................................. 63 circuit board (within 3 times).
6-12. Printed Wiring Boards ­Panel Section­ ............................ 67 · Be careful not to apply force on the conductor when soldering or
6-13. Printed Wiring Board ­Power Amp Section­ .................... 71 unsoldering.
6-14. Schematic Diagram ­Power Amp Section­ ....................... 72
6-15. IC Pin Function Description .............................................. 79

7. EXPLODED VIEWS .................................................. 83

8. ELECTRICAL PARTS LIST .................................... 93




­4­
SECTION 1 This section is extracted
from instruction manual.
GENERAL




­5­
­6­
­7­
­8­
­9­
­ 10 ­
­ 11 ­
­ 12 ­
­ 13 ­
­ 14 ­
­ 15 ­
­ 16 ­
­ 17 ­
­ 18 ­
­ 19 ­
­ 20 ­
­ 21 ­
SECTION 2
DISASSEMBLY
· This set can be disassembled in the order shown below.

FRONT PANEL CD MECHANISM OPTICAL
CASE BASE UNIT BD BOARD
SECTION DECK SECTION PICK-UP
(Page 22) (Page 24) (Page 26)
(Page 22) (Page 23) MAIN BOARD (Page 26)
(Page 24) SLED
TRAY SECTION MOTOR
(Page 25) (Page 26)

TAPE MECHANISM MD BOARD CAPSTAN MOTOR
DECK SECTION (Page 27) (Page 27)
(Page 23)
Note: Follow the disassembly procedure in the numerical order given.
3 three screws
CASE 2 screw (case 3 TP2) (BVTT 3 × 6)
(3 × 10)




4 Remove the case to
direction of the arrow.


1 two screws 2 screw
(case 3 TP2) (case 3 TP2)
(3 × 8) (3 × 10)




1 two screws
(case 3 TP2)
(3 × 8)




FRONT PANEL SECTION 1 Turn the cam to
direction of the
arrow A.
3 loading panel



A
5 screw
(BVTT 3 × 10)




2 Pull the tray




5 screw 4 three flat wires
8 front panel section (BVTT 3 × 10) (CN102, 205, 206)


6 four screws
7 two claws (BVTT 3 × 6)

­ 22 ­
CD MECHANISM DECK SECTION 1 two connectors
(CN203, 204)




3 three screws
(BVTP 3 × 8)




2 flat wire
4 CD mechanism deck section
(CN202)
Note: The CD mechanism deck will
fall if three screws are removed.
Support it by hand, then remove
three screws.




TAPE MECHANISM DECK SECTION
3 three screws
(BVTP 3 × 8)
4 tape mechanism deck
section




2 Open the
cassette lids.




1 Push the two buttons.




­ 23 ­
BASE UNIT

1 two yoke bracket 2 boss




3 base unit




MAIN BOARD


4 four screws
(BVTP 3 × 8)




1 connector
(CN901)
2 connector
(CN105)
3 flat wire (CN201)




IC201




4 two screws 6 main board
(BVTP 3 × 8)


5 connector
(CN101)




­ 24 ­
TRAY SECTION
claw A
claw B
3 flat wire
(CN705)




flat wire



Note: When installing the tray, pull around the flat
4 two claws
wire to pass through the claw A and claw B,
as shown in the figure.




2 Pull the tray.
5 Removal the tray.

1 Turn the cam to direction
of the arrow.




Note: When installing the tray, take care so that the collars (A) and
(B) are properly inserted into the slots.




slots collar A

collar B




­ 25 ­
BD BOARD
1 two screws
1 two screws
(PTPWH M2.6 × 6)
(PTPWH M2.6 × 6)




2 optical pick-up
section
3 two springs

3 two springs



5 screw
4 flat wire
(BVTP 2.6 × 8)
(CN101)


6 Removal
the four solders. 7 BD board


limit switch




OPTICAL PICK-UP, SLED MOTOR


3 optical pick-up




4 two screws
(P 2 × 3)



2 sled shaft




1 claw
5 sled motor




­ 26 ­
MD BOARD
1 connector 2 two rivets
(CN651)


4 four screws
(BTP 2.6 × 4)




3 Break the soldering of two
flexible flat cables.


5 MD board




CAPSTAN MOTOR


4 Removal the capstan motor
to direction of the arrow.

2 two screws
(BTP 2.6 × 8)




1 Break the soldering of
motor lead.

3 claw




5 Hang the
two belts.




­ 27 ­
SECTION 3
TEST MODE
[MC Cold Reset] [Change-over of AM Tuner Step between 9kHz and 10kHz]
· The cold reset clears all data including preset data stored in the · A step of AM channels can be changed over between 9kHz and
RAM to initial conditions. Execute this mode when returning the 10kHz.
set to the customer. Procedure:
Procedure: 1. Press POWER button to turn the set ON.
1. Press three buttons SPECTRUM ANALYZER , 2. Select the function "TUNER", and press TUNER/BAND
ENTER/NEXT , and DISC 1 simultaneously. button to select the BAND "AM".
2. The fluorescent indicator tube becomes blank instantaneously, 3. Press POWER button to turn the set OFF.
and the set is reset. 4. Press ENTER/NEXT and POWER buttons simultaneously,
and the display of fluorescent indicator tube changes to "AM
[CD Delivery Mode] 9k STEP" or "AM 10k STEP", and thus the channel step is
· This mode moves the pickup to the position durable to vibration. changed over.
Use this mode when returning the set to the customer after repair.
Procedure: [LED and Fluorescent Indicator Tube All Lit, Key Check
1. Press POWER button to turn the set ON. Mode]
2. Press PLAY button and POWER button simultaneously. Procedure:
3. A message "LOCK" is displayed on the fluorescent indicator 1. Press three buttons SPECTRUM ANALYZER ,
tube, and the CD delivery mode is set. ENTER/NEXT , and DISC 3 simultaneously.
2. LEDs and fluorescent indicator tube are all turned on.
[MC Hot Reset] Press DISC 2 button, and the key check mode is activated.
· This mode resets the set with the preset data kept stored in the 3. In the key check mode, the fluorescent indicator tube displays
memory. The hot reset mode functions same as if the power cord "K 1 V0 J0". Each time a button is pressed, "K"value increases.
is plugged in and out. However, once a button is pressed, it is no longer taken into
Procedure: account.
1. Press three buttons SPECTRUM ANALYZER , "J" value increases like 1, 2, 3 ... if rotating JOG knob in "+"
ENTER/NEXT , and DISC 2 simultaneously. direction, or it decreases like 0, 9, 8 ... if rotating in "­" direc-
2. The fluorescent indicator tube becomes blank instantaneously, tion.
and the set is reset. "V" value increases like 1, 2, 3 ... if rotating VOLUME knob
in "+" direction, or it decreases like 0, 9, 8 ... if rotating in "­"
[Sled Servo Mode] direction.
· This mode can run the CD sled motor freely. Use this mode, for 4. To exit from this mode, press three buttons in the same manner
instance, when cleaning the pickup. as step 1, or disconnect the power cord.
Procedure:
1. Select the function "CD".
2. Press three buttons SPECTRUM ANALYZER ,
ENTER/NEXT , and FUNCTION simultaneously.
3. The Sled Servo mode is selected, if "CD" is blanking on the
fluorescent indicator tube.
4. With the CD in stop status, press ) button in CD section to
move the pickup to outside track, or 0 button to inside track.
5. To exit from this mode, perform as follows:
1) Move the pickup to the most inside track.
2) Press three buttons in the same manner as step 2.
Note:
· Always move the pickup to most inside track when exiting from
this mode. Otherwise, a disc will not be unloaded.
· Do not run the sled motor excessively, otherwise the gear can be
chipped.

[Change-over of FUNCTION Name]
· The FUNCTION name of external input terminal can be changed
over to VIDEO or MD.
Procedure:
1. Press POWER button to turn the set OFF.
2. Press POWER button together with FUNCTION button, and
the power is turned on, the display of fluorescent indicator tube
changes to "MD" or "VIDEO" instantaneously, and thus the
FUNCTION is changed over.




­ 28 ­
[Aging Mode] 7. In the aging mode, the aging is executed in a sequence given
This mode can be used for operation check of CD section and tape in "2-2. Operation during Aging Mode".
deck section. The aging continues unless an alarm occurred.
· If an error occurred: 8. To exit from the aging mode, press POWER button to turn
The aging operation stops. the set OFF.
· If no error occurs:
The aging operation continues repeatedly. 2-2. Operation during Aging Mode
In the aging mode, the program is executed in the following se-
1. Aging Mode in CD Section quence.
1-1. Operating Method of Aging Mode 1. A tape on FWD side is played for one minute.
1. Set discs in DISC1 and DISC2 trays. 2. PAUSE STOP is made.
2. Select the function "CD". 3. Recording is made for 3 minutes. (For the deck not having
3. Press three buttons SPECTRUM ANALYZER , the record function, the play is executed. In this case, ·
ENTER/NEXT , and KARAOKE PON/MPX simulta- LED does not light up.)
neously. 4. FF is executed up to the end of tape.
4. The aging mode is activated, if a roulette mark on the fluo- 5. A tape is reversed, and the tape on REV side is played for
rescent indicator tube is blinking. one minute.
5. In the aging mode, the aging is executed in a sequence given 6. PAUSE STOP is made.
in "1-2. Operation during Aging Mode". 7. Recording is made for 3 minutes. (For the deck not having
The aging continues unless an alarm occurred. the record function, the play is executed. In this case, ª
6. To exit from the aging mode, press POWER button to turn LED does not light up.)
the set OFF. 8. FF is executed up to the end of tape.
· If a button other than buttons In CD section is pressed during 9. Steps 1 through 8 are executed for the other deck.
aging, the aging in the CD section is finished. 10. Steps 1 through 9 are repeated unless an alarm occurred.
· To execute aging to the tape deck section successively, press ·
button in the deck A. 2-3. Deck Selection Sequence
"AGING" is displayed on the fluorescent indicator tube. (For the · During the aging mode, decks are selected in the following se-
aging in tape deck, see "2. Aging Mode in Tape Deck Section". quence:
Deck A (FWD) Deck A (REV)
1-2. Operation during aging Mode
In the aging mode, the program is executed in the following se- Deck B (REV) Deck B (FWD)
quence.
1. The disc table is ejected.
2. The disc tray turns to select a disc. (For a disc selection
sequence, see Section 1-3.)
3. TOC of disc is read.
4. The pickup accesses to the last track.
5. A disc is ejected.
6. Steps 2 through 5 are repeated.

1-3. Disc Selection Sequence
· During the aging mode, discs are selected in the following se-
quence:
Disc 1 Disc 2

Disc 2 Disc 1

2. Aging Mode in Tape Deck Section
2-1. Operating Method of Aging Mode
1. Load a commercially available 10-minute tape into the decks
A and B respectively.
(If a 10-minute tape is not available, another tape may be
used but a cycle time will be longer.)
2. Select the function "TAPE".
3. Rewind tapes in advance by pressing 0 button respec-
tively on decks A and B.
4. Press three buttons SPECTRUM ANALYZER ,
ENTER/NEXT , and KARAOKE PON/MPX simulta-
neously.
5. Press · button on deck A. (This button triggers the ag-
ing mode.)
6. The aging mode is activated if "AGING A" is displayed on
the fluorescent indicator tube.


­ 29 ­
SECTION 4 SECTION 5
MECHANISM ADJUSTMENTS ELECTRICAL ADJUSTMENTS
PRECAUTION DECK SECTION 0dB=0.775V
1. Clean the following parts with a denatured-alcohol-moistened
swab: 1. Demagnetize the record/playback head with a head demagne-
record/playback head pinch roller tizer. (Do not bring the head demagnetizer close to the erase
erase head rubber belts head.)
capstan idlers 2. Do not use a magnetized screwdriver for the adjustments.
2. Demagnetize the record/playback head with a head demagne- 3. After the adjustments, apply suitable locking compound to the
tizer. parts adjust.
3. Do not use a magnetized screwdriver for the adjustments. 4. The adjustments should be performed with the rated power sup-
4. After the adjustments, apply suitable locking compound to the ply voltage unless otherwise noted.
parts adjusted. 5. The adjustments should be performed in the order given in this
5. The adjustments should be performed with the rated power sup- service manual. (As a general rule, playback circuit adjustment
ply voltage unless otherwise noted. should be completed before performing recording circuit ad-
justment.)
· Torque Measurement
6. The adjustments should be performed for both L-CH and R-ch.
Mode Torque Meter Meter Reading 7. Switches and controls should be set as follows unless otherwise
36 to 61g·cm specified.
Forward CQ-102C 8. Set to test mode. (Press key switch same time
(0.50 ­ 0.84 oz·inch)
SPECTRUM ANALYZER ENTER/NEXT and
Forward 2 to 6g·cm EFFECT ON/OFF button.)
CQ-102C
Back Tension (0.026 ­ 0.082 oz·inch)
36 to 61g·cm · Test Tape
Reverse CQ-102RC
(0.50 ­ 0.84 oz·inch)
Tape Signal Used for
Reverse 2 to 6g·cm
CQ-102RC P-4-A100 10kHz, ­10 dB Azimuth Adjustment
Back Tension (0.026 ­ 0.082 oz·inch)
61 to 143g·cm WS-48B 3kHz, 0dB Tape Speed Adjustment
FF, REW CQ-201B
(0.85 ­ 1.98 oz·inch) P-4-L300 315Hz 0dB Level Adjustment
· Tape Tension Measurement Record/Playback Head Azimuth Adjustment
Mode Tension Meter Meter Reading DECK A DECK B
Forward CQ-403A more than 100g (3.53 oz)
Note: Perform this adjustments for both decks
Reverse CQ-403R more than 100g (3.53 oz) Procedure:
1. Mode: Playback (FWD)

test tape main board
P-4-A100 CN207
(10KHz, ­10dB) Pin 1 (L-CH)
Pin 3 (R-CH) level meter

set
+
­
main board
CN207
Pin 2




­ 30 ­
2. Turn the adjustment screw and check output peaks. If the peaks Tape Speed Adjustment DECK A
do not match for L-CH and R-CH, turn the adjustment screw Note: Start the Tape Speed adjustment as below after setting to the
so that outputs match within 1dB of peak. test mode.
In the test mode, the tape speed is high during pressing the
HIGH SPEED DUBBING button.
Procedure:
within 1. Turn the power switch on.
L-CH 1dB
peak 2. Press the SPECTRUM ANALYZER button,
within
output 1dB ENTER/NEXT button and EFFECT ON/OFF button simul-
level taneously.
To exit from the test mode, press the POWER button.
Mode: Playback (FWD)
R-CH
peak
Screw Screw test tape
position L-CH R-CH position WS-48B frequency counter
peak peak (3 kHz, 0 dB)

3. Mode: Playback (FWD) set +
­
test tape
P-4-A100 main board
(10kHz, ­10dB) oscilloscope CN207 (Pin 1 : L-CH)
pin 1 (Pin 3 :R-CH)
L-CH
pin 2
main L 1. Insert the WS-48B into the deck A and the blank tape into the
board V H
CN207
deck B.
set R 2. Press the REC button and · button on the deck B. Then
the deck B is at recording mode.
R-CH
3. Set the deck A to playback mode.
pin 3
4. Keep pressing the HIGH SPEED DUBBING button in play-
back mode.
waveform of oscilloscope
Then at HIGH speed mode.
5. Adjust RV652 on the AUDIO board do that frequency counter
in phase 45° 90° 135° 180°
reads 6,000 ± 60 Hz.
6. Take off the HIGH SPEED DUBBING button.
good wrong Then at NORMAL speed mode.
7. Adjust RV651 on the AUDIO board so that frequency counter
4. Repeat steps 1 to 3 in playback (REV) mode. reads 3,000 +30 Hz.
­10

5. After the adjustments, apply suitable locking compound to the 8. Frequency difference between deck A and deck B the beginning
pats adjusted. of the tape should be within ± 1.5 %.
Adjustment Location: Record/Playback Head (Deck A and B) Adjustment Location: AUDIO board
and main board.
Playback level Adjustment DECK A DECK B
Procedure:
Mode: Playback (FWD)

test tape
P-4-L300 level meter
(315 Hz, 0 dB)

set +
­

main board
CN207 (Pin 1 : L-CH)
(Pin 3 : R-CH)

Deck A is RV311 (L-CH) and RV411 (R-CH), Deck B is RV301 (L-
CH) and RV401 (R-CH) so that adjustment within adjustment level
as follows.
Adjustment Level:
CN207 PB level: 301.5 to 338.3 mV (­8.2 to ­7.2 dB) level
difference between the channels: within ±0.5 dB
Adjustment Location: AUDIO and main boards

reverse
forward




­ 31 ­
Record bias Current Adjustment DECK B Adjustable limits:
Procedure: CN207 PB level: 47.3 to 53.1 mV (­24.3 to ­23.3 dB)
1. Mode: record Adjustment Location: main board

Pin 6 (L-CH) of IC1501 on the main board. [MAIN BOARD] (Component Side)
Pin #¶ (L-CH) of IC1501 on the main board.
1) 315 Hz
RV1501
2) 10 kHz 50 mV (­23.8 dB)

AF OSC blank tape IC1501
CN-123 CN205
600 CN207
attenuator IC301
IC201 RV1551
set
RECORD LEVEL
Pin 2 (GND) of ICN207 on the main board.

2. Mode: Playback
recorded level meter
portion

set +
­

CN207 (Pin 1 : L-CH)
(Pin 3 : R-CH)
Confirm playback the signal recorded in step 1 become adjustable [AUDIO BOARD] (Conductor Side)
limits as follows. RECORD
If these levels do not adjustable limits, adjustment the RV341 (L-CH) TAPE SPEED
BAIS







and RV441 (R-CH) on the AUDIO board to repeat steps 1 and 2.












Adjustable limits: Playback output of 315 Hz to playback output R L (NORMAL) (HIGH)
RV301®L
RV651 RV652
of 10kHz: ±0.5 dB RV401®R RV441 RV341
® ®
Adjustment Location: AUDIO and main boards










RV311
PB LEVEL
PB L®

Record Level Adjustment DECK B LEVEL RV411
­ DECK B ­
Procedure: R®
1. Mode: record ­ DECK A ­
Pin 6 (L-CH) of IC1501 on the main board.
Pin #¶ (R-CH) of IC1501 on the main board.
315 Hz, 50 mV (­23.8 dB)
AF OSC
blank tape
600 CS-123
attenuator
set

Pin 2 (GND) of CN207 on the main board.

2. Mode: Playback
recorded level meter
portion

set +
­

CN207 (Pin 1 : L-CH)
(Pin 3 : R-CH)
Confirm playback the signal recorded in step 1 become adjustable
limits as follows.
If these levels do not adjustable limits, adjustment the RV1501 (L-
CH) and RV1551 (R-CH) on the main board to repeat steps 1 and 2.




­ 32 ­
TUNER SECTION 0dB=1µV
(HCD-RX70: AEP, German, UK model only)
Note: As a front-end (FE1) is difficult to repair if faulty, replace it
with new one.

AM Section Adjustment
Setting:
loop antenna
loop antenna (Supplied accessories)


AM RF SSG


set

30% amplitude
modulation by
400 Hz signal 60 cm AM ANTENNA
terminal (TM1)
Field strength dB (µV/m) =SSG output level dB (µV/m) ­26 dB.

Adjustment Location:
AM Tuned Level Adjustment
Band: AM or MW
Procedure: [TCB BOARD] (Component Side)
1. Set the output of SSG so that the input level of the set becomes
55 dB. IC41
RV41
2. Tune the set to 999 kHz.
3. Adjust RV41 to the point (moment) when the TUNED indicator
will change from going off to going on.
Adjustment Location : TCB board

FM Section Adjustment RV42
Note: This adjustment should be performed after the AM Tuned TM1
Level Adjustment due to the same adjustment element.
Setting:

FM RF stereo signal FE1
generator
75 coaxial

set
Carrier frequency : 98 MHz
Modulation : AUDIO 1 kH, 75 kHz
deviation (100%) FM ANTENNA terminal
(TM1) (75 open)

FM Tuned Level Adjustment
Band: FM
Procedure:
1. Supply a 25dBµ 98 MHz signal from the ANTENNA terminal.
2. Tune the set to 98 MHz.
3. If the TUNED indicator does not light, adjust RV42 to the point
(moment) when the TUNED indicator will change from going
off to going on.
Adjustment Location: TCB board




­ 33 ­
CD SECTION S Curve Check

Note: oscilloscope
1. CD Block is basically designed to operate without adjustment. BD board
Therefore, check each item in order given.
2. Use YEDS-18 disc (3-702-101-01) unless otherwise indicated. TP (FEO) +
TP (VC) ­
3. Use an oscilloscope with more than 10M impedance.
4. Clean the object lens by an applicator with neutral detergent Procedure:
when the signal level is low than specified value with the fol- 1. Connect oscilloscope to test point TP (FEO).
lowing checks. 2. Connect between test point TP (FOK) and GND by lead wire.
5. Adjust the focus bias adjustment when optical block is replaced. 3. Turn Power switch on.
4. Put disc (YEDS-18) in and turned Power switch on again and
Focus Bias check actuate the focus search. (actuate the focus search when disc
table is moving in and out.)
oscilloscope 5. Check the oscilloscope waveform (S-curve) is symmetrical be-
(DC range)
tween A and B. And confirm peak to peak level within 3±1 Vp-p.
BD board
S-curve waveform
TP (RF) + symmetry
VC ­

Procedure:
1. Connect oscilloscope to test point TP (RF). (GND terminal : A
VC) within 3 ± 1 Vp-p
2. Turn