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1. POWER CHECK FLOW
A.
No 5V
Is 3.3VA
NO
section working?
YES
Is 5.6V present at
collector of Q126?
YES
Replace Q126.
Note: This shooting is the original circuitry so there are some different points from DVF-5400.
B.
NO
NO
No 3.3VA
Check FR101
Is there a DC voltage at
NO
Check D105/D106/D107/
cathode of D105 or D107?
YES
Replace IC101.
No 3.3VA
Is 3.3VA
section working?
YES
Is 3.3V
present at emitter
of Q121?
YES
Replace Q121.
YES
D108 and replace.
2. SYSTEM OPERATION FLOW
Power on
1. 186 CPU initializes SERVO, DSP &
RISC registers
2. Write RISC code to SDRAM
3. Reset RISC
Show LOGO
YES
Tray closed?
NO
Tray close to closed position
SLED at inner side?
NO
SLED moves to inner position
1. Judge whether have disc and disc type
2. Jump to related disc reading procedure
Recieve
OPEN/CLOSE key?
NO
1. Execute pressed key & IR key
2. System operation routine loop
1. Stop playback & open tray
2. Display tray open message & LOGO
NO
Receive CLOSE key?
YES
YES
YES
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