Pioneer gmx 904 service manual

Page 1

GD PIONEER'

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. GM-X904/X1H/UC

ORDER NO.

CRT1 692

BRIDGEABLE FOUR-CHANNEL POWER AMPLIFIER

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. This Service Manual has been written in English and Japanese.

C The 10 pin extension cable (6601053) is provided between the amp unit CN451 and the filter unit
CN401. Please use as required when testing this model.

CONTENTS
1. DISASSEMBLY ..................................................... 2 5. EXPLODED VIEW ................................................... 13
2. ELECTRICAL PARTS LIST ........................................ 3 6. PACKING METHOD ................................................ 15
3. CIRCUIT DIAGRAM AND PATTERN ........................ 5 7. SPECIFICATIONS .................................................... 17
4. ADJUSTMENT ........................................................ 12 8. OPERATIONS AND CONNECTION ....................... 17

SAFETY INFORMATION IUC MODEL)
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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.

MINING

Lead in solder used in this product is listed by the California Health and Welfare agency as a known reproductive
toxicant which may cause birth defects or other reproductive harm (California Health BI Safety Code, Section 25249.5).
When servicing or handling circuit boards and other components which contain lead in solder, avoid unprotected skin
contact with the solder. Also, when soldering do not inhale any smoke or fumes produced.

PIONEER ELECTRONIC CORPORATION 4-1, Meguro 1-Chome, Megur_o-ku, T060 153, Japan ' "
PIONEER ELECTRONICS SERVICE INC. P.0.Box 1760, Long Beach, CA 90801-1760, USA.
PIONEER ELECTRONIC [EUROPE] N.V. Haven 1087, Keetberglaan 1, 9120 Melsele, Belgium

PIONEER ELECTRONICS ASIACENTRE PTE. LTD. 501 Orchard Road. #10-00 Lane Crawford Place, Singapore 0923
© PIONEER ELECTRONIC CORPORATION 1995

K-FFD. JUNE 1995 Printed in Japan

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1. DISASSEMBLY / fiflo) b #7:

. Removing the Case and Panel
1.Remove the six screws A, and then remove the case.
2.Remove the four screws 8, and then remove the panel.

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0 Removing the Heat Sink Assy
1.Flemove the three screws C. C
2.The heat sink assy is closely fit in the heat sink with silicon

grease. Insert a screwdriver between the holder and the C 7 y 71: y l~

heat sink assy to remove the heat smk assy. Amp Unit

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, Heat Sink

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327° Heat Sink Assy
O Precautions when assembling the Heat Sink my 9

Place the amp unit on the heat sink assy and tighten the
three screws C. In order to prevent the screws from
glooeenlrig,efter about five minutes, re-tiahten to make Fig.2
sure there is no looseness.

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