Marantz MAR770 - Manual (Page 12)

10
7. Faultfinding trees
7.1 CDR-Module
Figure 7-1
NO DISC LOADED
SWITCH ON POWER
PRESS
<OPEN/CLOSE>
SEE CD-DA DISC
FAULT FINDING
SEE CD-R DISC
FAULT FINDING
SEE CD-RW DISC
FAULT FINDING
INSERT DISC
PRESS <OPEN/CLOSE>
DISPLAY?
DISPLAY:
"INSERT DISC"
CD-DA DISC
LOADED?
CHECK:
POWER SUPPLY (SEE FAULT FINDING GUIDE PSU)
WIRING
ON/OFF SWITCH
FUSES
VOLTAGES
DISPLAY (SEE FAULT FINDING GUIDE DISPLAY BOARD)
WIRING
CONTROL SIGNALS
CLOCK SIGNAL 8MHz
SUPPLY VOLTAGES
ELECTRICAL SERVICE DIAGNOSTICS:
DISPLAY TEST, KEYBOARD TEST
POWER SUPPLY VOLTAGES
ELECTRICAL SERVICE DIAGNOSTICS:
REPLACE CDR MODULE IF
"DERRn"
OR "BERRn" ERROR OCCURS
CHECK:
MECHANICAL SERVICE DIAGNOSTICS:
REPLACE CDR MODULE IF ERROR OCCURS
TRAY?
CD-R DISC
LOADED?
NO NO
NO
NO
NO
YES
YES YES
YES
YES
CD-RW DISC
LOADED?
YES
MAINS, MAINS CABLE
CHECK:
STANDBY LED
KEYBOARD
WIRING
DISPLAY BOARD (SEE FAULT FINDING GUIDE DISPLAY BOARD)
WIRING
CONTROL SIGNALS
CLOCK SIGNAL 8MHz
SUPPLY VOLTAGES
ELECTRICAL SERVICE DIAGNOSTICS:
DISPLAY TEST, KEYBOARD TEST
KEYBOARD
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