Samsung BQ1AQ4T013 Service Manual page 42

4-1-13 PCB Failure
PCB Failure
- Check the input voltage of
PCB SMPS (input check-
point : 230V )
YES
- Check the output voltage of
PCB SMPS (Output check-
point : 5V/12V )
- Do all relays operate?
NO
- Check the operating base
voltage(5V) which is appro-
priate for each relay.
NO
Replace PCB
- TCO Open?
NO
- Check Terminal block
voltage(230V).
Reset the circuit braker or
check main power.
NO
- Check fuse protecting SMPS
Replace PCB
• After Lamp On
YES
- Safety Relay
Contact point ON(12V)?
YES
YES
Replace Relay
YES
NO
YES
NO
NO
YES
NO
- 40 -
Replace TCO
Repair Faulty wiring
or PCB check
Replace FUSE
Replace PCB
YES
- Check the operating Base
voltage(0V) of Safety
Relay.
YES
Replace Safety Relay