Marantz NR1504 /U1B - 6. SMPS Troubleshooting

NO
NO
NO
Is there damage in IC4140
(TOP258MG)?
Is there the damage in D4142/D4143/
D4144/D4145/IC4140?
Repair the solder short part of the PCB
board.
Check the damage of each part.
Replace the damaged parts.
Replace the damaged parts.
Is the fuse (F4140) blown?
Is there solder short circuit in the PCB
board?
Is there a damaged part?
Replace the IC4140 (TOP258MG) and
D4142/D4143/D4144/D4145.
DC 5V is not output.
YES
YES
YES
YES
YES
YES
6. SMPS
87