Troubleshooting; Troubleshooting For The Power-On Sequence Error - Sony HKDV-900 Maintenance Manual

2-3. Troubleshooting

2-3. Troubleshooting
The trouble that may occur during a self diagnostic test and its possible cause are described below.

2-3-1. Troubleshooting for the Power-on Sequence Error

All LEDs on the front panel does not light and stay the state
(1) Power supply input check
Is the cable between the power connector
(CN600) on the CP-364 board and the
switching regulator properly connected?
NG
Connect the cable properly and test
again
(2) Switching regulator output check
Does +5 V DC present to the pins 1 and
2 of connector CN600 on the CP-364
board?
NG
Disconnect the cable from the connector
CN600, and test the harness again
OK
Short between +5 V and GND on the
CP-364 board
(3) Switching regulator input check
Does the specified AC voltage present
to the AC input terminal of the switching
regulator?
OK
Check the fuse on the switching
regulator
OK
Switching regulator defect
2-8 (E)
OK
To "(2) Switching regulator output check"
OK
To "(4) CP-364 board power check"
NG
To " (3) Switching regulator input check"
NG
Power supply line defect. Pull the cord out
and current conduction test
NG
Fuse defect
HKDV-900