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Service
Manual
BRIDGEABLE POWER AMPLIFIER
GM-X942
GM-X742
CONTENTS
PIONEER CORPORATION
PIONEER ELECTRONICS SERVICE INC.
PIONEER EUROPE N.V.
Haven 1087 Keetberglaan 1, 9120 Melsele, Belgium
PIONEER ELECTRONICS ASIACENTRE PTE.LTD. 253 Alexandra Road, #04-01, Singapore 159936
C PIONEER CORPORATION 2000
GM-X942/X1R/UC
X1R/UC,EW,ES
4-1, Meguro 1-Chome, Meguro-ku, Tokyo 153-8654, Japan
P.O.Box 1760, Long Beach, CA 90801-1760 U.S.A.
7.2 IC .........................................................................36
K-ZZA. JAN. 2000 Printed in Japan
ORDER NO.
CRT2454
X1R/UC,EW,ES

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   Summary of Contents for Pioneer GM-X742

  • Page 1: Table Of Contents

    PIONEER ELECTRONICS SERVICE INC. P.O.Box 1760, Long Beach, CA 90801-1760 U.S.A. PIONEER EUROPE N.V. Haven 1087 Keetberglaan 1, 9120 Melsele, Belgium PIONEER ELECTRONICS ASIACENTRE PTE.LTD. 253 Alexandra Road, #04-01, Singapore 159936 C PIONEER CORPORATION 2000 K-ZZA. JAN. 2000 Printed in Japan...

  • Page 2: Safety Information

    GM-X942,X742 1. SAFETY INFORMATION - GM-X942/X1R/UC, GM-X742/X1R/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.

  • Page 3

    See Contrast table(2) 5 Carton 8-3 Owner’s Manual See Contrast table(2) See Contrast table(2) (2) CONTRAST TABLE GM-X742/X1R/UC, EW and ES are constructed the same except for the following: Part No. Mark No. Symbol and Description GM-X742/X1R/UC GM-X742/X1R/EW GM-X742/X1R/ES 5 Carton...

  • Page 4

    GM-X942,X742 2.2 EXTERIOR(GM-X942/X1R/UC, EW, ES)

  • Page 5

    GM-X942,X742 (1) EXTERIOR SECTION PARTS LIST Mark No. Description Part No. Mark No. Description Part No. 1 Screw BSZ30P050FZK 21 Terminal(CN901) HKE0020 2 Screw(M3x6) CBA1320 22 Terminal(CN651) HKE0021 3 Screw(M3x12) CBA1323 23 Terminal(CN652) HKE0021 4 Screw(M3x5) HBA0006 24 Clip HNC0054 5 Screw(M3x8) HBA0011 25 Buss Bar...

  • Page 6

    GM-X942,X742 2.3 EXTERIOR(GM-X742/X1R/UC, EW, ES)

  • Page 7

    40 Transistor(Q908) 2SB1566 20 Pin Jack(CN852) HKB0002 41 Beads Core See Contrast table(2) (2) CONTRAST TABLE GM-X742/X1R/UC, EW and ES are constructed the same except for the following: Part No. Mark No. Symbol and Description GM-X742/X1R/UC GM-X742/X1R/EW GM-X742/X1R/ES 7 Panel HNB0118...

  • Page 8: Schematic Diagram

    GM-X942,X742 3. SCHEMATIC DIAGRAM 3.1 OVERALL CONNECTION DIAGRAM(GUIDE PAGE)(GM-X942/X1R/UC, EW, ES) Note: When ordering service parts, be sure to refer to “EXPLODED VIEWS AND PARTS LIST” or “ELECTRICAL PARTS LIST”. Large size SCH diagram Guide page Detailed page AMP UNIT ISOLATOR CIRCUIT GAIN=1 CN851...

  • Page 9

    GM-X942,X742 BASS BOOST 40-120Hz GAIN=9.7-34dB 0-18dB/OCTAVE 94-4980 94-4980 20kΩ(C) CN651 50kΩ(C) 94-4981 94-4981 94-4980 94-4980 CN652 94-4981 94-4981 GM-X942/X1R/EW, ES HEK0030 HEK0030 CN901...

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    GM-X942,X742...

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    GM-X942,X742...

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    GM-X942,X742...

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    GM-X942,X742...

  • Page 14

    GM-X942,X742 3.2 OVERALL CONNECTION DIAGRAM(GUIDE PAGE)(GM-X742/X1R/UC, EW, ES) AMP UNIT ISOLATOR CIRCUIT GAIN=1 CN851 20KΩ(E) 20KΩ(C) CN852 50KΩ(C) HP/LP FILTER 40-120Hz 12dB/OCTAVE CN852 20KΩ(E) CN851 POWER SUPPLY...

  • Page 15

    GM-X942,X742 BASS BOOST 40-120Hz 0-18dB/OCTAVE GAIN=8.8-33dB 94-4980 CN651 94-4981 94-4980 CN652 94-4981 GM-X742/X1R/EW, ES HEK0020 HEK0020 CN901...

  • Page 16

    GM-X942,X742...

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    GM-X942,X742...

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    GM-X942,X742...

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    GM-X942,X742...

  • Page 20: Pcb Connection Diagram

    GM-X942,X742 4. PCB CONNECTION DIAGRAM 4.1 AMP UNIT(GM-X942/X1R/UC, EW, ES) AMP UNIT NOTE FOR PCB DIAGRAMS 1. The parts mounted on this PCB include all necessary parts for several destination. For further information for 1 2 3 1 2 3 1 2 3 1 2 3 respective destinations, be sure...

  • Page 21

    GM-X942,X742 SIDE A 1 2 3 1 2 3 1 2 3 1 2 3 1 2 3 B REMOTE 3 2 1...

  • Page 22

    GM-X942,X742 AMP UNIT...

  • Page 23

    GM-X942,X742 SIDE B...

  • Page 24

    GM-X942,X742 4.2 AMP UNIT(GM-X742/X1R/UC, EW, ES) AMP UNIT PRE-OUT 3 2 1 3 2 1...

  • Page 25

    GM-X942,X742 SIDE A 1 2 3 1 2 3 1 2 3 1 2 3 B REMOTE 3 2 1 3 2 1...

  • Page 26

    GM-X942,X742 AMP UNIT...

  • Page 27

    GM-X942,X742 SIDE B...

  • Page 28: Electrical Parts List

    GM-X942,X742 5. ELECTRICAL PARTS LIST 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.

  • Page 29

    GM-X942,X742 =====Circuit Symbol and No.===Part Name Part No. =====Circuit Symbol and No.===Part Name Part No. ------ ------------------------------------------ ------------------------- ------ ------------------------------------------ ------------------------- RS1/10S103J SPR30R1J RS1/10S103J SPR30R1J RS1/10S123J SPR30R1J RS1/10S123J RD1/4PU564J RS1/10S103J RD1/4PU564J RS1/10S103J RD1/4PU473J RS1/10S123J RD1/4PU473J RS1/10S123J RS1/2PMF100J RD1/4PU472J RS1/2PMF100J RD1/4PU472J RD1/4PU331J RS1/10S392J RD1/4PU331J...

  • Page 30

    GM-X942,X742 =====Circuit Symbol and No.===Part Name Part No. =====Circuit Symbol and No.===Part Name Part No. ------ ------------------------------------------ ------------------------- ------ ------------------------------------------ ------------------------- RS1/10S472J 337RZM050M1020 RS1/10S222J 337RZM050M1020 RS1/2PMF220J CFTNA333J50 RS1/10S153J CFTNA333J50 RS1/2PMF220J CQMA102J50 RS1/10S153J CQMA102J50 RS1/10S102J CMA330J2H RD1/4PU272J CMA330J2H RS1/10S472J 220µF/10V CCH1036 RS1/10S472J CFTLA103J50 RS1/10S472J...

  • Page 31

    GM-X942,X742 =====Circuit Symbol and No.===Part Name Part No. =====Circuit Symbol and No.===Part Name Part No. ------ ------------------------------------------ ------------------------- ------ ------------------------------------------ ------------------------- Unit Number : HWH0121(GM-X742/X1R/UC) Diode 1SS133 Diode ERA15-02VH : HWH0116(GM-X742/X1R/EW) Diode ERA15-02VH : HWH0122(GM-X742/X1R/ES) Diode RM4Z Unit Name : Amp Unit...

  • Page 32

    RS1/2PMF121J RD1/4PU103J RD1/4PU104J RD1/4PU102J RS1/10S202J RD1/4PU472J RS1/10S223J RD1/4PU221J RS1/10S103J RD1/4PU563J RD1/4PU272J RD1/4PU473J RD1/4PU272J RD1/4PU103J RS1/2PMF560J RD1/4PU103J RS1/2PMF560J RD1/4PU222J RD1/4PU123J RD1/4PU472J RS1/10S101J RD1/4PU222J RD1/4PU513J RD1/4PU221J (GM-X742/X1R/EW, ES) RD1/4PU105J RD1/4PU152J RD1/4PU222J CAPACITORS RD1/4PU472J CCSQCH470J50 RD1/4PU101J CCSQCH470J50 RS1/10S472J CFTNA104J50 RD1/4PU821J CFTNA104J50 RD1/4PU821J CFTNA104J50...

  • Page 33: Adjustment

    GM-X942,X742 =====Circuit Symbol and No.===Part Name Part No. =====Circuit Symbol and No.===Part Name Part No. ------ ------------------------------------------ ------------------------- ------ ------------------------------------------ ------------------------- CFTNA104J50 CFTLA103J50 CFTNA273J50 CFTLA103J50 CFTNA273J50 CFTLA334J50 CEAS4R7M35 CKSQYB223K50 CEAS4R7M35 CKSQYB471K50 CFTLA334J50 CKSQYB471K50 CFTLA334J50 CEAS100M16 CFTLA473J50 CEAS100M16 CFTLA473J50 CFTNA104J50 CEAS470M16 CFTNA104J50 CEAS470M16 CCSQCH470J50...

  • Page 34: General Information

    GM-X942,X742 7. GENERAL INFORMATION 7.1 DISASSEMBLY - GM-X942/X1R/UC, EW, ES Case Removing the Case (Fig.1) Remove the six screws. Remove the three screws. Remove the four screws and then remove the Case. Fig.1 Plate Removing the Amp Unit Remove the screw and then remove the Plate. (Fig.1) Remove the two screws.

  • Page 35

    GM-X942,X742 - GM-X742/X1R/UC, EW, ES Case Removing the Case (Fig.3) Remove the four screws. Remove the three screws. Remove the four screws and then remove the Case. Fig.3 Plate Removing the Amp Unit Remove the screw and then remove the Plate.

  • Page 36

    GM-X942,X742 7.2 IC PA2027A Transient voltage detector Stby Bandgap DET1 Circuit motion:on DET2 Cont_V 50µA DET_R Filter 4.7kΩ Bandgap:on Switch:on Vs_out 0.13V Mute_out 5.6V Oneshot (1µsec)

  • Page 37: Operations And Specifications

    GM-X942,X742 8. OPERATIONS AND SPECIFICATIONS 8.1 OPERATIONS...

  • Page 38

    GM-X942,X742...

  • Page 39: Connection Diagram

    RCA input jack Front side Back side GM-X942: Fuse (30 A) × 2 GM-X742: Fuse (20 A) × 2 Speaker output terminal 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).

  • Page 40: Specifications

    GM-X942,X742 8.2 SPECIFICATIONS GM-X942/X1R/UC Power source ......................14.4 V DC (10.8 — 15.1 V allowable) Grounding system ............................Negative type Current consumption ......................26.1 A (at continuous power, 4 Ω) Average current drawn* ......................8.5 A (4 Ω for two channels) 14.6 A (4 Ω...

  • Page 41

    GM-X942,X742 GM-X942/X1R/EW Power source ......................14.4 V DC (10.8 — 15.1 V allowable) Grounding system ............................Negative type Current consumption ....................26.1 A (at continuous power, 4 Ω) Average current drawn* ......................8.5 A (4 Ω for two channels) 14.6 A (4 Ω for one channel) Fuse ..................................

  • Page 42

    GM-X942,X742 GM-X942/X1R/ES Power source ......................14.4 V DC (10.8 — 15.1 V allowable) Grounding system ............................Negative type Current consumption ......................26.1 A (at continuous power, 4 Ω) Average current drawn* ......................8.5 A (4 Ω for two channels) 14.6 A (4 Ω for one channel) Fuse ....................................

  • Page 43

    GM-X942,X742 GM-X742/X1R/UC Power source ......................14.4 V DC (10.8 — 15.1 V allowable) Grounding system ............................Negative type Current consumption ......................22.1 A (at continuous power, 4 Ω) Average current drawn* ......................7.5 A (4 Ω for two channels) 12.6 A (4 Ω for one channel) Fuse ....................................

  • Page 44

    GM-X942,X742 GM-X742/X1R/EW Power source ......................14.4 V DC (10.8 — 15.1 V allowable) Grounding system ............................Negative type Current consumption ....................22.1 A (at continuous power, 4 Ω) Average current drawn* ......................7.5 A (4 Ω for two channels) 12.6 A (4 Ω for one channel) Fuse ..................................

  • Page 45

    GM-X942,X742 GM-X742/X1R/ES Power source ......................14.4 V DC (10.8 — 15.1 V allowable) Grounding system ............................Negative type Current consumption ......................22.1 A (at continuous power, 4 Ω) Average current drawn* ......................7.5 A (4 Ω for two channels) 12.6 A (4 Ω for one channel) Fuse ....................................

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