Test & Debug Flow - NAD M5 C/AH Service Manual

3. Test & debug flow
Switch on the Power switch
Check the AC Voltage on
Power PCB (110V or 220V)
YES
Press the power key on front panel
Is the DC Voltage
outputs OK?
(5V,3.3V,9V,±12V,5VA)
YES
Is 3.3V,1.8V and 2V DC
outputs normal on decode
PCB?
YES
Insert the upgrade disc to update
the FLASH memory code.
Update FLASH
successfully?
YES
A
NO
Check Fuse and connections
to AC inlet
NO Repair or Replace Power PCB
Replace R-core Transformer
NO
Check the regulators or related diodes.
1. Check 27MHz system clock.
2. Check system reset circuit.
NO
3. Check FLASH R/W enable signal LOE#,WRLL.
4. Check servo related circuit.
5. Check FLASH Memory related circuit.
3-4