Pioneer GM-X944 Service Manual
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Pioneer GM-X944 Service Manual

Pioneer GM-X944 Service Manual

Bridgeable four-channel power amplifier
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See also: Owner's Manual
Service
Manual
BRIDGEABLE FOUR-CHANNEL POWER AMPLIFIER
GM-X944
CONTENTS
1. SAFETY INFORMATION............................................2
2. EXPLODED VIEWS AND PARTS LIST ......................2
3. SCHEMATIC DIAGRAM.............................................6
4. PCB CONNECTION DIAGRAM................................12
5. ELECTRICAL PARTS LIST........................................18
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-X944/X1R/UC
4-1, Meguro 1-Chome, Meguro-ku, Tokyo 153-8654, Japan
P.O.Box 1760, Long Beach, CA 90801-1760 U.S.A.
6. ADJUSTMENT .........................................................24
7. GENERAL INFORMATION.......................................25
7.1 DISASSEMBLY ..................................................25
8. OPERATIONS AND SPECIFICATIONS ....................26
K-ZZA. MAR. 2000 Printed in Japan
ORDER NO.
CRT2483
X1R/UC,EW,ES

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Summary of Contents for Pioneer GM-X944

  • 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. MAR. 2000 Printed in Japan...

  • Page 2: Safety Information

    GM-X944 1. SAFETY INFORMATION - GM-X944/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 GM-X944 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. - PACKING SECTION PARTS LIST Part No.
  • Page 4 GM-X944 2.2 EXTERIOR...
  • Page 5 94-4980 (Q353, 354, 355, 356, 357, 358, 359, 360) 50 Screw BBZ30P140FMC 51 Screw BBZ30P060FMC (2) CONTRAST TABLE GM-X944/X1R/UC, EW and ES are constructed the same except for the following: Part No. Mark No. Description GM-X944/X1R/UC GM-X944/X1R/EW GM-X944/X1R/ES 7 Panel...

  • Page 6: Schematic Diagram

    GM-X944 3. SCHEMATIC DIAGRAM 3.1 OVERALL CONNECTION DIAGRAM(GUIDE PAGE) Note: When ordering service parts, be sure to refer to “EXPLODED VIEWS AND PARTS LIST” or “ELECTRICAL PARTS LIST”. LOW XOVER NETWORK UNIT AMP UNIT HP/LP FILTER BP FILTER 40-120Hz ISOLATOR...
  • Page 7 GM-X944 GAIN=8.5-33dB CB(A) CB(B) CN301 GAIN=8.5-33dB CN301 GM-X944/X1R/EW, ES CN904 CN903 CN902 CN901...
  • Page 8 GM-X944 A-a B C...
  • Page 9 GM-X944 A-a C...
  • Page 10 GM-X944...
  • Page 11 GM-X944...

  • Page 12: Pcb Connection Diagram

    GM-X944 4. PCB CONNECTION DIAGRAM 4.1 AMP UNIT NOTE FOR PCB DIAGRAMS 1. The parts mounted on this PCB CN104 include all necessary parts for several destination. For further information for respective destinations, be sure to check with the schematic diagram.
  • Page 13 GM-X944 SIDE A FAN MOTOR...
  • Page 14 GM-X944 AMP UNIT...
  • Page 15 GM-X944 SIDE B...
  • Page 16 GM-X944 4.2 NETWORK PCB(A) SIDE A NETWORK PCB(A) CN101 OFF, LPF, HPF, BPF LOW, HIGH SIDE B NETWORK PCB(A)
  • Page 17 GM-X944 4.3 NETWORK PCB(B) SIDE A NETWORK PCB(B) CN103 LOW, HIGH OFF, LPF, HPF SIDE B NETWORK PCB(B)

  • Page 18: Electrical Parts List

    GM-X944 5. ELECTRICAL PARTS LIST NOTE: - 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 19 ------------------------------------------ ------------------------- ------ ------------------------------------------ ------------------------- CFTLA124J50 Transistor 2SC2240 CKSQYB182K50 Transistor 2SC2240 CKSQYB182K50 Transistor 2SC2240 Transistor 2SA970 Unit Number : HWH0134(GM-X944/X1R/UC) Transistor 2SA970 : HWH0123(GM-X944/X1R/EW) Transistor 2SA970 : HWH0135(GM-X944/X1R/ES) Transistor 2SA970 Unit Name : Amp Unit 94-4980 94-4980 MISCELLANEOUS 94-4980 94-4980...
  • Page 20 Thermistor CCX1013 RD1/4PU153J Thermistor CCX1013 RD1/4PU153J Thermistor CCX1035 RD1/4PU153J Thermistor CCX1027 RD1/4PU153J Slide Switch(4CH†2CH) CSH1042 RD1/4PU181J Switch(BFC)(GM-X944/X1R/EW, ES) HSH-156 RD1/4PU181J Variable Resistor 10kΩ(A) CCS1265 RD1/4PU181J Variable Resistor 10kΩ(A) CCS1265 RD1/4PU181J Semi-fixed 10kΩ(B) CCP1206 RD1/4PU432J Semi-fixed 10kΩ(B) CCP1206 RD1/4PU432J Semi-fixed 10kΩ(B)
  • Page 21 GM-X944 =====Circuit Symbol and No.===Part Name Part No. =====Circuit Symbol and No.===Part Name Part No. ------ ------------------------------------------ ------------------------- ------ ------------------------------------------ ------------------------- RD1/4PU163J RD1/4PU561J RD1/4PU163J RD1/4PU473J RD1/4PU121J RD1/4PU104J RD1/4PU121J RD1/4PU472J RD1/4PU121J RD1/4PU103J RD1/4PU121J RD1/4PU102J RD1/4PU102J RD1/4PU472J RD1/4PU102J RD1/4PU222J RD1/4PU102J RD1/4PU563J RD1/4PU102J...
  • Page 22 CMA220J2H RN1/10SE1002D CMA220J2H RS1/10S223J CMA220J2H RS1/10S223J CMA220J2H RS1/10S821J CQMA152J50 RS1/10S821J CQMA152J50 RS1/10S472J CQMA152J50 RS1/10S222J CQMA152J50 RS1/10S472J CQMA103J50 RS1/10S472J CQMA103J50 (GM-X944/X1R/EW, ES) RD1/4PU105J CQMA103J50 RS1/2PMF220J CQMA103J50 RS1/10S473J CMA030D2H RS1/2PMF220J CMA030D2H RS1/10S153J CMA030D2H RS1/10S102J CMA030D2H RD1/4PU272J CMA180J2H RS1/10S472J CMA180J2H RS1/10S472J CMA180J2H RS1/10S472J...
  • Page 23 GM-X944 =====Circuit Symbol and No.===Part Name Part No. =====Circuit Symbol and No.===Part Name Part No. ------ ------------------------------------------ ------------------------- ------ ------------------------------------------ ------------------------- CFTLA103J50 337RZM050M1020 470µF/16V CCH1183 337RZM050M1020 CKSQYB223K50 337RZM050M1020 CEAS220M16 337RZM050M1020 470µF/16V CCH1183 CFTLA224J50 CFTLA105J50 CFTLA224J50 CFTLA103J50 CFTLA564J50 CFTLA103J50 CCG-081 CFTLA334J50...

  • Page 24: Adjustment

    GM-X944 6. ADJUSTMENT - Setting Idle Current The following is the instructions for setting Idle current: Setting the idle current to the following ranges will require you to measure the voltage across the indicated resistors and adjusting the indicated variable resistors to set the required voltage range.

  • Page 25: General Information

    GM-X944 7. GENERAL INFORMATION 7.1 DISASSEMBLY Case Removing the Case and the Plate (Fig.1) Connector Remove the six screws. Remove the screw. Remove the three screws. Remove the six screws. Disconnect the connector and then remove the Case. Remove the screw and then remove the Plate.

  • Page 26: Operations And Specifications

    GM-X944 8. OPERATIONS AND SPECIFICATIONS 8.1 OPERATIONS...
  • Page 27 GM-X944...

  • Page 28: Connection Diagram

    GM-X944 Connection Diagram Fuse (30 A) × 2 Special red battery wire [RD-223] (sold separately). Grommet After making all other connections at the amplifier, connect the battery wire terminal of the amplifier to the positive (+) terminal of the battery.

  • Page 29: Specifications

    GM-X944 8.2 SPECIFICATIONS - GM-X944/X1R/UC Power source ......................14.4 V DC (10.8 — 15.1 V allowable) Grounding system ............................Negative type Current consumption ......................43.7 A (at continuous power, 4 Ω) Average current drawn* ......................14.5 A (4 Ω for four channels) 26.5 A (4 Ω...
  • Page 30 GM-X944 - GM-X944/X1R/EW Power source ......................14.4 V DC (10.8 — 15.1 V allowable) Grounding system ............................Negative type Current consumption ....................43.7 A (at continuous power, 4 Ω) Average current drawn* ...................... 14.5 A (4 Ω for four channels) 26.5 A (4 Ω...
  • Page 31 GM-X944 - GM-X944/X1R/ES Power source ......................14.4 V DC (10.8 — 15.1 V allowable) Grounding system ............................Negative type Current consumption ......................43.7 A (at continuous power, 4 Ω) Average current drawn* ......................14.5 A (4 Ω for four channels) 26.5 A (4 Ω...

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