Yamaha RX-V990, Service Manual

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RX-V990
• DISASSEMBLY PROCEDURES
(Remove parts in disassembly order as numbered.)
1. Removal of Top Cover
a. Remove 4 screws (
CD )
and 3 screws (
CI! )
in Fig. 1.
2. Removal of Bottom Cover
a. Remove 11 screws (
® )
in Fig. 1.
3. Removal of Front Panel
a. Remove 5 knobs.
b. Remove 6 screws (
® )
in Fig. 1.
Front Panel
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• DIAGNOSTIC MODE
PURPOSE OF DIAGNOSTIC MODE
• If the protection circuit operates to turn OFF the
POWER when the POWER is turned ON, the cause can
be found out by starting the DIAGNOSTIC mode. (Pro-
tection message)
• Some items of the DIAGNOSTIC menu facilitate opera-
tion check, inspection and measurement.
HOW TO START DIAGNOSTIC (DIAG.)
Turn on the POWER key while pressing ClO PRO LOGIC
and 70mm MOVIE THEATER keys simultaneously, and
then the DIAG. mode is started.
HOW TO CANCEL DIAG.
Turning off the POWER key of the front panel or pressing
the CHURCH key of the remote control transmitter will
restore the normal operation and DIAG. will be canceled.
• To keep the setting stored in the memory, be sure to
check that DIAG. No. 7 is set to "KEEP DATA" before
canceling DIAG. DIAG. No.7 is set to "KEEP DATA"
when starting DIAG.
Top Cover
Bottom Cover
Fig. 1
Monitor Display
DIAG VER.·· ....
1. MAIN BYPASS
2. FRONT RAM THR
3. MAIN DSP THR
4. EFCT OFF/DISP
5. MANUAL TEST
6. PRO LOGIC
7. FACTORY PRESET
8. AD CHECK MODE
The menu of the DIAGNOSTIC mode is displayed on
the monitor display and kept as it is untill canceled.
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