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Service Manual
BRIDGEABLE POWER AMPLIFIER
BRIDGED
BRIDGEABLE 2-CH POWER AMPLIFIER
ORDER NO.
30A
30A
GM-X972/XR/UC
CRT3008
GM-X972
XR/UC,XR/EW,XR/ES
For details, refer to "Important symbols for good services".
PIONEER CORPORATION
4-1, Meguro 1-Chome, Meguro-ku, Tokyo 153-8654, Japan PIONEER ELECTRONICS (USA) INC. P.O.Box 1760, Long Beach, CA 90801-1760 U.S.A. PIONEER EUROPE NV Haven 1087 Keetberglaan 1, 9120 Melsele, Belgium PIONEER ELECTRONICS ASIACENTRE PTE.LTD. 253 Alexandra Road, #04-01, Singapore 159936
C PIONEER CORPORATION 2002
K-ZZY. NOV. 2002 Printed in Japan
1
2
3
4
SAFETY INFORMATION
A
- GM-X972/XR/UC
CAUTION This service manual is intended for qualified service technicians; it is not meant for the casual do-it-yourselfer. Qualified technicians have the necessary test equipment and tools, and have been trained to properly and safely repair complex products such as those covered by this manual. Improperly performed repairs can adversely affect the safety and reliability of the product and may void the warranty. If you are not qualified to perform the repair of this product properly and safely, you should not risk trying to do so and refer the repair to a qualified service technician. WARNING
B
This product contains lead in solder and certain electrical parts contain chemicals which are known to the state of California to cause cancer, birth defects or other reproductive harm. Health & Safety Code Section 25249.6 - Proposition 65
[ Important symbols for good services ]
In this manual, the symbols shown-below indicate that adjustments, settings or cleaning should be made securely. When you find the procedures bearing any of the symbols, be sure to fulfill them:
C
1. Product safety
You should conform to the regulations governing the product (safety, radio and noise, and other regulations), and should keep the safety during servicing by following the safety instructions described in this manual.
2. Adjustments
To keep the original performances of the product, optimum adjustments or specification confirmation is indispensable. In accordance with the procedures or instructions described in this manual, adjustments should be performed.
3. Cleaning
D
For optical pickups, tape-deck heads, lenses and mirrors used in projection monitors, and other parts requiring cleaning, proper cleaning should be performed to restore their performances.
4. Shipping mode and shipping screws
To protect the product from damages or failures that may be caused during transit, the shipping mode should be set or the shipping screws should be installed before shipping out in accordance with this manual, if necessary.
5. Lubricants, glues, and replacement parts
E
Appropriately applying grease or glue can maintain the product performances. But improper lubrication or applying glue may lead to failures or troubles in the product. By following the instructions in this manual, be sure to apply the prescribed grease or glue to proper portions by the appropriate amount.For replacement parts or tools, the prescribed ones should be used.
F
2 1 2
GM-X972/XR/UC
3
4
5
6
7
8
CONTENTS
SAFETY INFORMATION ............................................2 1. SPECIFICATIONS........................................................3 2. EXPLODED VIEWS AND PARTS LIST .......................4 2.1 PACKING...............................................................4 2.2 EXTERIOR .............................................................6 3. SCHEMATIC DIAGRAM .............................................8 3.1 OVERALL CONNECTION DIAGRAM(GUIDE PAGE) ....8 4. PCB CONNECTION DIAGRAM ................................14 4.1 AMP UNIT...........................................................14 5. ELECTRICAL PARTS LIST ........................................18 6. ADJUSTMENT..........................................................20 7. GENERAL INFORMATION .......................................21 7.1 DIAGNOSIS ........................................................21 7.1.1 DISASSEMBLY .........................................21 7.1.2 CONNECTOR FUNCTION DESCRIPTION .......22 7.2 IC ........................................................................23 8. OPERATIONS............................................................24
A
B
1. SPECIFICATIONS
Power source .............................................................................................................. 14.4 V DC (10.8 -- 15.1 V allowable) Grounding system ............................................................................................................................................ Negative type Current consumption ........................................................................................................ 37.5 A (at continuous power, 4 ) Backup current ................................................................................................................................................. 3.0 mA or less Average current drawn* .......................................................................................................... 12.0 A (4 for two channels) 18.5 A (4 for one channel) Fuse ............................................................................................................................................................................ 30 A × 2 Dimensions .......................................................................................................................... 269 (W) × 50 (H) × 309 (D) mm [10-5/8 (W) × 2 (H) × 12-1/8 (D) in] Weight ......................................................................................................... 3.7 kg (8.2 lbs) (Leads for wiring not included) Maximum power output ...................... .............................................................................................. 300 W × 2 / 800 W × 1 Continuous power output ..................... .................................... 150 W × 2 (at 14.4 V, 4 , 20 -- 20,000 Hz, 0.08% THD) 400 W × 1 (at 14.4 V, 4 , 20 -- 20,000 Hz, 0.8% THD) 200 W × 2 (at 14.4 V, 2 , 20 -- 20,000 Hz, 0.8% THD) Load impedance ............................................................................................................................ 4 (2 -- 8 allowable) (Bridge connection: 4 -- 8 allowable) Frequency response ............................................................................................................ 10 -- 50,000 Hz (+0 dB, 1 dB) Signal-to-noise ratio ..................... .................................................................................................. 100 dB (IHFA network) Distortion ............................................................................................................................................. 0.008% (10 W, 1 kHz) . Separation ......................................................................................................................................................... 65 dB (1 kHz) Low pass filter ................................................................................................................................ Cut off frequency: 80 Hz Cut off slope: 12 dB/oct Maximum input level/impedance .................................................................................... RCA: 6.5 V/22 k (0.2 -- 6.5 V) Speaker: 26 V/40 k (0.8 -- 26 V)
C
D
E
Note:
· Specifications and the design are subject to possible modification without notice due to improvements.
*Average current drawn
· The average current drawn is nearly the maximum current drawn by this unit when an audio signal is input. Use this value when working out total current drawn by multiple power amplifiers. F
GM-X972/XR/UC
3 7 8
5
6
1
2
3
4
2. EXPLODED VIEWS AND PARTS LIST
2.1 PACKING
A
B
C
D
E
F
4 1 2
GM-X972/XR/UC
3
4
5
6
7
8
NOTE:
- Parts marked by "*" are generally unavailable because they are not in our Master Spare Parts List. - Screws adjacent to mark on the product are used for disassembly. - For the applying amount of lubricants or glue, follow the instructions in this manual. ( In the case of no amount instructions, apply as you think it appropriate.)
A
- PACKING SECTION PARTS LIST
Mark No. Description 1 2 3 4 5 6 7 8 9 Screw Assy Screw Polyethylene Bag Cover Polyethylene Bag Carton Contain Box Protector Owner's Manual(UC) Owner's Manual(EW) Part No. HEA0058 BYC40P180FZK HEG0011 HNS0101 HEG0022
B
HHG0339 HHL0339 HHP0168 HRD0218 HRD0220 HRD0222 HRD0223 HRY1157 HDE0036
C
*
Owner's Manual(ES) 10 Owner's Manual(ES) 11 Warranty Card 12 Cord Assy
- Owner's Manual Part No. Language HRD0218 English, French HRD0220 English, French, Spanish, German, Italian, Dutch HRD0222 English, Spanish HRD0223 Portuguese(B), Arabic
D
E
F
GM-X972/XR/UC
5 7 8
5
6
1
2
3
4
2.2 EXTERIOR
A
B
C
D
E
F
6 1 2
GM-X972/XR/UC
3
4
5
6
7
8
- EXTERIOR SECTION PARTS LIST
Mark No. Description 1 2 3 4 5 6 7 8 9 10 Screw Screw Chassis Panel Panel Case Spacer Spacer Heat Sink Amp Unit(UC) Part No. BBZ30P060FZK BBZ30P160FZK HNA0013 HNB0187 HNB0190 HNB0194 HNM0006 HNM0124 HNR0228 HWH0194 HWH0195 HWH0196 BBZ30P050FZK BBZ30P080FMC CKF1059
B A
Amp Unit(EW) Amp Unit(ES) 11 Screw 12 Screw 13 Terminal(CN604) 14 15 16 17 18 19 20 21 22 23,24 25 26 27 28 29 30 31 32 33 34 ····· Fuse(30A) Pin Jack(CN801) Terminal(CN601) Terminal(CN851) Terminal(CN852) Connector(CN803) Holder Clip ····· Heat Sink Screw Light Pipe Unit Screw Screw Screw Diode(D611) Diode(D612) Cushion
HEK0030 HKB0020 HKE0048 HKE0049 HKE0049 HKM1077 HNC0082 HNC0145
C
HNR0229 PPZ30P100FZK HXA0391 ISS30P055FUC PPZ30P100FZK HBA0029 FML22R FML22S HNM6623 HBA0030 BBZ30P060FZK
D
FET(Q612,613,614,615,616,617) STP80NF55-06FP
35 Screw 36 Screw
E
F
GM-X972/XR/UC
7 7 8
5
6
1
2
3
4
3. SCHEMATIC DIAGRAM
3.1 OVERALL CONNECTION DIAGRAM(GUIDE PAGE)
A-a A-b
Large size SCH diagram
A
A-a
A-b
Guide page
A AMP UNIT
A-a
GAIN = 1
LPF SELECT
A-a
A-b
Detailed page
B
GAIN = -12dB
C
LPF SELECT
D
HCS0003 10k(A)
HCS0003 10k(A)
EW, ES ONLY
75µH
BFC
E
75µH
F
8
A
1 2
GM-X972/XR/UC
3
4
5
6
7
8
A
A-b
AMPLIFIER GAIN = 11.5 - 41.8dB
B
C
D
*** UC EW, ES R608 1R8K 5R1K R609 1R8K 5R1K FU603 HEK0030 *** *** EW, ES ONLY
E
>
FU602 HEK0030
34µH
>
RM4Z-LFJ4
UC ONLY
NOTE : Symbol indicates a resistor. No differentiation is made between chip resistors and discrete resistors. Symbol indicates a capacitor. No differentiation is made between chip capacitors and discrete capacitors. The > mark found on some component parts indicates the importance of the safety factor of the part. Therefore, when replacing, be sure to use parts of identical designation.
Decimal points for resistor and capacitor fixed values are expressed as : 2.2 2R2 0.022 R022
F
GM-X972/XR/UC
5
6
7
A 8
9
D
C
E
B
A
F
A-a A-b
10
GAIN = 1
LPF SELECT
A-a
1
HCS0003 10k(A)
LPF SELECT
HCS0003 10k(A)
1
1
A AMP UNIT
2
2
GM-X972/XR/UC
GAIN = -12dB
3
3
2
4
4
3
5
6
7
8
3
BFC
4
A-a A-b
75µH
EW, ES ONLY
A
B
C
D
75µH
E
F
GM-X972/XR/UC
A-a
7 8
11
5
6
D
C
E
B
A
F
A-a A-b
12
AMPLIFIER GAIN = 11.5 - 41.8dB
A-b
1
1
2
2
1
GM-X972/XR/UC
3
3
2
4
4
3
3
5
GM-X972/XR/UC
UC ONLY NOTE : Symbol indicates a resistor. No differentiation is made between chip resistors and discrete resistors. Symbol indicates a capacitor. No differentiation is made between chip capacitors and discrete capacitors. The > mark found on some component parts indicates the importance of the safety factor of the part. Therefore, when replacing, be sure to use parts of identical designation. Decimal points for resistor and capacitor fixed values are expressed as : 2.2 2R2 0.022 R022
RM4Z-LFJ4
5
*** UC EW, ES R608 1R8K 5R1K R609 1R8K 5R1K FU603 HEK0030 *** *** EW, ES ONLY
>
6
6
34µH
FU602 HEK0030
>
4
7
7 D E
A-b
A-a A-b
B A C
8
8
13
F
1
2
3
4
4. PCB CONNECTION DIAGRAM
4.1 AMP UNIT
NOTE FOR PCB DIAGRAMS A
1.The parts mounted on this PCB include all necessary parts for several destination. For further information for respective destinations, be sure to check with the schematic diagram. 2.Viewpoint of PCB diagrams Connector Capacitor
SIDE A
A
AMP UNIT
P.C.Board
Chip Part
SIDE B
B
2 L+ 1 R- R+ SPEAKER INPUT L3
4
C
R+
L+
RLINPUT
D
GAIN
E
LPF SELECT
F
A
14
A 1
GM-X972/XR/UC
2
3
4
5
6
7
8
SIDE A
A
FU603
B
FU602
C
POWER SUPPLY 1
2
3
D
2
1 SPEAKER OUTPUT
E
2
1
BFC
F
GM-X972/XR/UC
A A
7 8
15
5
6
1
2
3
4
A
A
AMP UNIT
B
C
1
D
1
E
1
F
A
16
A
1 2
GM-X972/XR/UC
3
4
5
6
7
8
SIDE B
A
B
1
C
L-
D
E
F
A
GM-X972/XR/UC
5
6
7
A 8
17
1
2
3
4
5. ELECTRICAL PARTS LIST
A
NOTES: - Parts whose parts numbers are omitted are subject to being not supplied. - The part numbers shown below indicate chip components. Chip Resistor RS1/_S___J,RS1/__S___J Chip Capacitor (except for CQS.....) CKS....., CCS....., CSZS.....
=====Circuit Symbol and No.===Part Name --- ----------------------------------------------Part No. ------------------------=====Circuit Symbol and No.===Part Name --- ----------------------------------------------D D D L L L L L L L T TH S S VR FU FU 616 909 911 501 502 601 602 603 801 802 601 603 101 601 301 602 603 Diode Diode LED Coil Coil Choke Coil 34µH (EW, ES) Choke Coil 75µH Choke Coil 75µH Ferri-Inductor Ferri-Inductor Transformer Thermistor Switch(LPF SELECT) Switch(BFC) (EW, ES) Volume 10k(A) Fuse 30A Fuse 30A Part No. ------------------------ERA15-02VH 1SS133 L934BR235SRCF HTH0011 HTH0011 HTH0006 HTH0010 HTH0010 CTF1007 CTF1007 HTT0024 HCX0001 HSH0004 HSH-156 HCS0003 HEK0030 HEK0030
B
A Unit Number
Unit Name
MISCELLANEOUS
IC IC IC IC IC IC IC IC IC IC IC IC Q Q Q Q Q Q Q Q 101 301 501 502 503 504 505 506 601 602 801 802 201 202 601 602 603 604 606 607 608 609 612 613 614 615 616 617 660 661 901 902 905 906 907 201 601 603 604 611 612 613 614 615 IC IC IC IC IC IC IC IC IC IC IC IC Transistor Transistor Transistor Transistor Transistor Transistor Transistor Transistor Transistor Transistor FET FET FET FET FET FET Transistor Transistor Transistor Transistor Transistor Transistor Transistor Diode Diode Diode Diode Diode Diode Diode Diode Diode
: : : :
HWH0194 (UC) HWH0195 (EW) HWH0196 (ES) Amp Unit
NJM2068D NJM2068D TDA7293V TDA7293V TDA7293V TDA7293V TDA7293V TDA7293V PA2027A UPC494C NJM2068D NJM2068D KSR2202 KSC1623 KSC1623 KSA812 2SB1243 KSR2202 2SD1919 2SD1919 2SB1277 2SB1277 STP80NF55-06FP STP80NF55-06FP STP80NF55-06FP STP80NF55-06FP STP80NF55-06FP STP80NF55-06FP 2SD1864 2SB1243 KSA812 KSA812 KSA812 KSC1623 KSC1623 1SS133 RM4Z-LFJ4 HZS7L(B2) 1SS133 FML22R FML22S HZS16L(1) HZS16L(1) ERA15-02VH
C
RESISTORS
R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R 101 102 103 104 201 202 203 204 205 206 301 302 303 304 305 306 307 308 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 601 RS1/16S103J RS1/16S103J RS1/16S103J RS1/16S103J RS1/16S472J RD1/4PU102J RD1/4PU202J RD1/4PU223J RD1/4PU103J RD1/4PU333J RS1/16S222J RS1/16S222J RS1/16S510J RS1/16S510J RS1/16S103J RS1/16S103J RS1/16S222J RS1/16S222J RS1/16S223J RS1/16S223J RS1/16S911J RS1/16S911J RD1/4PU243J RD1/4PU243J HCN0005 HCN0005 RD1/4PU473J RD1/4PU473J RS1/16S102J RS1/16S102J HCN0005 HCN0005 HCN0005 HCN0005 RD1/4PU102J
D
Q Q Q Q Q Q Q Q Q Q Q Q Q Q Q D D D D D D D D D
E
2.20 2.20
F
2.20 2.20 2.20 2.20
18 1 2
GM-X972/XR/UC
3
4
5
6
7
8
=====Circuit Symbol and No.===Part Name --- ----------------------------------------------R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R 602 603 604 605 606 607 608 608 609 609 610 611 612 613 614 616 619 620 621 622 623 625 626 627 628 631 632 635 636 637 638 639 640 641 642 643 645 646 647 648 649 650 651 652 654 655 656 657 658 665 666 801 802 803 804 805 806 807 808 811 812 813 814 831 832 (EW, ES) (UC) (EW, ES) (UC) (EW, ES)
Part No. ------------------------RD1/4PU473J RD1/4PU103J RD1/4PU103J RD1/4PU222J RD1/4PU472J RD1/4PU472J RD1/4PU182J RD1/4PU512J RD1/4PU182J RD1/4PU512J RD1/4PU103J RD1/4PU472J RD1/4PU101J RD1/4PU221J RD1/4PU152J RS1/16S101J RS1/16S102J RS1/16S473J RS1/16S102J RS1/16S153J RD1/4PU105J RD1/4PU621J RD1/4PU621J RS1/16S472J RS1/16S472J RD1/4PU272J RS1/16S472J RS1/2PMF360J RS1/2PMF360J RS1/2PMF360J RS1/2PMF360J RS1/2PMF360J RS1/2PMF360J RD1/4PU472J RD1/4PU472J RS1/2PMF220J RD1/4PU472J RD1/4PU472J RS1/2PMF561J RS1/2PMF561J RS1/2PMF220J RD1/4PU104J RD1/4PU103J RD1/4PU393J RD1/4PU223J RD1/4PU223J RD1/4PU223J RS1/2PMF561J RS1/2PMF561J RS1/2PMF220J RS1/2PMF220J RS1/16S471J RS1/16S471J RS1/16S223J RS1/16S223J RN1/10SE1002D RN1/10SE1002D RN1/10SE1002D RN1/10SE1002D RN1/10SE1002D RN1/10SE1002D RN1/10SE1002D RN1/10SE1002D RS1/16S683J RS1/16S683J
=====Circuit Symbol and No.===Part Name --- ----------------------------------------------R R R R R R R R R R R R R R R 901 902 903 904 905 906 907 908 917 918 919 920 924 930 931 0.22 0.22 0.22 0.22
Part No. ------------------------HCN0001 HCN0001 HCN0001 HCN0001 RD1/4PU563J RD1/4PU563J RD1/4PU203J RD1/4PU203J RD1/4PU273J RD1/4PU472J RD1/4PU103J RD1/4PU392J RD1/4PU473J RD1/4PU331J RD1/4PU331J
A
CAPACITORS
C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C 101 102 103 104 201 202 301 302 303 304 501 502 503 504 505 506 507 508 509 510 511 512 517 518 519 520 521 522 529 530 531 532 537 538 539 540 601 602 603 606 607 608 609 611 612 613 614 615 616 617 CFTNA274J50 CFTNA274J50 CFTNA154J50 CFTNA154J50 CEAT1R0M50 CEAT1R0M50 CCSRCH101J50 CCSRCH101J50 CFTNA103J50 CFTNA103J50 CEAT220M50 CEAT220M50 CEAT101M50 CEAT101M50 CEAT220M50 CEAT220M50 CFTNA104J50 CFTNA104J50 CFTNA104J50 CFTNA104J50 CCSRCH471J50 CCSRCH471J50 CEAT220M50 CEAT220M50 CFTNA104J50 CFTNA104J50 CFTNA104J50 CFTNA104J50 CFTNA104J50 CFTNA104J50 CFTNA104J50 CFTNA104J50 CFTNA564J50 CFTNA564J50 CQMA102J50 CQMA102J50 CFTNA103J50 CFTNA224J50 CFTNA103J50 CFTNA103J50 CEAT100M16 CEAT100M16 CEAT470M16 CEAT220M50 HCH0013 CFTNA103J50 CFTNA103J50 CEAT100M16 CEAT221M10 CQMA102J50
B
C
D
E
470µF/16V
F
GM-X972/XR/UC
19 7 8
5
6
1
2
3
4
=====Circuit Symbol and No.===Part Name --- ----------------------------------------------C C C C C C C C C C C C C C C 618 619 620 621 622 623 624 628 631 632 633 634 635 636 637 638 644 651 652 653 654 670 801 802 803 804 805 806 807 808 809 810 811 812 831 832 901 220µF/10V 3900µF/16V 3900µF/16V
Part No. ------------------------CEAT2R2M50 CEAT101M16 CQMA472J50 CQMA472J50 CQMA102J50 HCH0018 HCH0018 CFTNA564J50 CEAT470M16 CEAT470M16 CEAT221M50 CEAT221M50 CEAT470M16 CEAT470M16 CFTNA473J50 CFTNA473J50 CQMA102J50 HCH0007 HCH0007 HCH0007 HCH0007 CQMA103J50 CCSRCH471J50 CCSRCH471J50 CEAT100M16 CEAT100M16 CQMA472J50 CQMA472J50 CCSRCH470J50 CCSRCH470J50 CCSRCH470J50 CCSRCH470J50 CFTNA104J50 CFTNA104J50 CEAT100M16 CEAT100M16 HCH0012
A
B
C C C C C C C C C C C C C C C C C C C C C C
2200µF/50V 2200µF/50V 2200µF/50V 2200µF/50V
C
D
6. ADJUSTMENT
There is no information to be shown in this chapter.
E
F
20 1 2
GM-X972/XR/UC
3
4
5
6
7
8
7. GENERAL INFORMATION
7.1 DIAGNOSIS 7.1.1 DISASSEMBLY
- Removing the Case (not shown) 1. Remove the eight screws and then remove the Case.
A
- Removing the Amp Unit (Fig.1)
Panel
B
1 2 3 4
Remove the eight screws.
1 1
1 1
Remove the screw and then remove the two Panels. Remove the eight screws and then remove the two Heat Sinks.
4
Remove the five screws and then remove the Amp Unit.
4 3
C
3
3 4
3
3
3
3 4 4
3
D
1 2 1
1 1
E
Heat Sink
Amp Unit
Panel
Heat Sink
Fig.1
F
GM-X972/XR/UC
21 7 8
5
6
1
2
3
4
7.1.2 CONNECTOR FUNCTION DESCRIPTION
A
- GM-X972/XR/UC
6.5V
0.2V
B
C
BRIDGED
BRIDGEABLE 2-CH POWER AMPLIFIER
30A
30A
D
E
F
22 1 2
GM-X972/XR/UC
3
4
5
6
7
8
7.2 IC
*TDA7293V
A
7 2
11
13 14
3 12 4 10 9
6
B
MUTE STBY
1 8
5
THERMAL SHUTDOWN
15
S/C PROTECTION
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
C
NON INVERTING INPUT
CLIP AND SHORT CIRCUIT DETECTOR
STAND-BY GND
+Vs (SIGNAL)
INVERTING INPUT
BUFFER DRIVER
SIGNAL GND
BOOTSTRAP
+Vs (POWER)
BOOTSTRAP LOADER
-Vs (SIGNAL)
-Vs (POWER)
STAND-BY
MUTE
OUT
D
IC's marked by * are MOS type. Be careful in handling them because they are very liable to be damaged by electrostatic induction.
E
F
GM-X972/XR/UC
23 7 8
5
6
D
C
E
B
A
F
24
8. OPERATIONS
1
1
Gain Control
The power indicator lights when the power is switched on.
Power Indicator
If the sound level is too low, even when the volume of the car stereo used along with this power amplifier is turned up, turn gain control on the front of the power amplifier clockwise. If the sound distorts when the volume is turned up, turn the gain control counter-clockwise.
2
2
· When using with an RCA equipped car stereo (standard output of 500 mV), set to the NORMAL position. When using with an RCA equipped Pioneer car stereo with max. output of 4 V or more, adjust level to match the car stereo output level. · If you hear too much noise when using the speaker input terminals, turn the gain control counter-clockwise.
BFC (Beat Frequency Control) Switch
If you hear a beat while listening to an MW/LW broadcast with your car stereo, change the BFC switch using a small standard tip screwdriver.
GM-X972/XR/EW GM-X972/XR/ES
GM-X972/XR/UC
3
3
LPF (Low-Pass Filter) Select Switch
Set the LPF select switch as follows according to the type of speaker that is connected to the speaker output connector and the car stereo system: LPF Select Switch
LPF (left) OFF (right)
Audio frequency range to be output
Very Low Frequency range Full range
Speaker Type
Subwoofer Full range
Remarks
Connect a subwoofer.
4
4
5
6
7
8
Connection Diagram
A
Ground wire (black) [RD-223] (sold separately) Connect to metal body or chassis. Fuse (30 A) Special red battery wire [RD-223] (sold separately) After making all other connections at the amplifier, connect the battery wire terminal of the amplifier to the positive (+) terminal of the battery. Fuse (30 A) Grommet Connecting wires with RCA pin plugs (sold separately).
B
Car stereo with RCA output jacks
C
External Output RCA input jack
Front side
D
Speaker input terminal
Fuse (30 A) × 2 Back side
E
Speaker output terminal See the "Connecting the Speaker wires" section for speaker connection instructions.
System remote control wire (sold separately) Connect the male terminal of this wire to the system remote control terminal of the car stereo (SYSTEM REMOTE CONTROL). The female terminal can be connected to the auto-antenna relay control terminal. If the car stereo does not have a system remote control terminal, connect the male terminal to the power terminal through the ignition switch.
F
GM-X972/XR/UC
25 7 8
5
6