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GX-505/GX-505VCD
MINI COMPONENT SYSTEM
GX-505
GX-505VCD
SERVICE MANUAL
GX-505 is composed of GX-505 (main unit) and NX-GX505s (speakers).
GX-505VCD is composed of GX-505VCD (main unit) and NX-GX505s (speakers).
GX-505/VCD
IMPORTANT NOTICE
This manual has been provided for the use of authorized YAMAHA Retailers and their service personnel.
It has been assumed that basic service procedures inherent to the industry, and more specifically YAMAHA Products, are
already known and understood by the users, and have therefore not been restated.
WARNING: Failure to follow appropriate service and safety procedures when servicing this product may result in
personal injury, destruction of expensive components, and failure of the product to perform as specified.
For these reasons, we advise all YAMAHA product owners that any service required should be performed
by an authorized YAMAHA Retailer or the appointed service representative.
IMPORTANT: The presentation or sale of this manual to any individual or firm does not constitute authorization, certifica-
tion or recognition of any applicable technical capabilities, or establish a principle-agent relationship
of any form.
The data provided is believed to be accurate and applicable to the unit(s) indicated on the cover. The research, engineering, and
service departments of YAMAHA are continually striving to improve YAMAHA products. Modifications are, therefore,
inevitable and specifications are subject to change without notice or obligation to retrofit. Should any discrepancy appear to
exist, please contact the distributor's Service Division.
WARNING: Static discharges can destroy expensive components. Discharge any static electricity your body may have
accumulated by grounding yourself to the ground buss in the unit (heavy gauge black wires connect to this
buss).
IMPORTANT: Turn the unit OFF during disassembly and part replacement. Recheck all work before you apply power to the
unit.
s CONTENTS
TO SERVICE PERSONNEL ................................... 1--2 ALL FUNCTION TEST MODE .................................... 18
GX-505 PANELS ..................................................... 3--4 CD ERROR MESSAGES ............................................ 18
GX-505VCD PANELS ................................................... 5 CD STANDARD OPERATION CHART .............. 19--20
SPECIFICATIONS ......................................................... 6 ADJUSTMENTS .................................................. 21--23
INTERNAL VIEW .......................................................... 7 IC DATA .............................................................. 24--30
DISASSEMBLY PROCEDURES .......................... 8--12 DISPLAY DATA .................................................. 31--32
VOLUME RANGE ....................................................... 13 BLOCK DIAGRAM .............................................. 33--37
SYSTEM CONTROL CHECK ..................................... 13 PRINTED CIRCUIT BOARD ............................... 38--60
TEST MODE ................................................................ 14 PIN CONNECTION DIAGRAM ................................... 61
SYSTEM TEST MODE ................................................ 14 SCHEMATIC DIAGRAM ..................................... 62--69
RECEIVER TEST MODE .................................... 15--16 PARTS LIST ...................................................... 70--102
TAPE TEST MODE ..................................................... 16 GX-505 REMOTE CONTROL TRANSMITTER ........ 103
CD TEST MODE ......................................................... 17 GX-505VCD REMOTE CONTROL TRANSMITTER .... 104
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GX-505/GX-505VCD
s TO SERVICE PERSONNEL
1. Critical Components Information. AC LEAKAGE
Components having special characteristics are marked Z WALL EQUIPMENT TESTER OR
and must be replaced with parts having specifications equal OUTLET UNDER TEST EQUIVALENT
to those originally installed.
2. Leakage Current Measurement (For 120V Models Only).
When service has been completed, it is imperative to verify
that all exposed conductive surfaces are properly insulated
from supply circuits. INSULATING
TABLE
q Meter impedance should be equivalent to 1500 ohm shunted q Leakage current must not exceed 0.5mA.
by 0.15