7
D
VF-5400
TR
OUBLESHOO
TING
Is 5.6V present at
collector of Q126?
No 3.3VA
YES
YES
YES
YES
No 5V
No 3.3VA
Replace Q126.
Check FR101
Replace Q121.
YES
Is there a DC voltage at
cathode of D105 or D107?
YES
NO
NO
NO
NO
Replace IC101.
A.
B.
Check D105/D106/D107/
D108 and replace.
Is 3.3VA
section working?
Is 3.3VA
section working?
Is 3.3V
present at emitter
of Q121?
Power on
1. 186 CPU initializes SERVO, DSP &
RISC registers
2. Write RISC code to SDRAM
3. Reset RISC
Show LOGO
Tray close to closed position
SLED moves to inner position
1. Judge whether have disc and disc type
2. Jump to related disc reading procedure
1. Execute pressed key & IR key
2. System operation routine loop
1. Stop playback & open tray
2. Display tray open message & LOGO
NO
YES
YES
NO
YES
YES
NO
NO
Tray closed?
SLED at inner side?
Recieve
OPEN/CLOSE key?
Receive CLOSE key?
1. POWER CHECK FLOW
2. SYSTEM OPERATION FLOW
Note: This shooting is the original circuitry so there are some different points from DVF-5400.
Summary of Contents for DVF-5400-B
Page 34: ...DVF 5400 ...
