Premium PPA1207 - Detailed Process

4-3-3 Detailed process
No
Malfunction
Check point
Reason
1
Disconnection power supply and
check fuse on PCB
Damage or not
Voltage exceeding
Fan motor short
2
Connect with power supply
Check voltage
1.Whether is there normal AC voltage on XB or not?
2.The DC voltage on IC5
input DC12V output DC5V
Rectification circuit mistake
Drop-down transformer does not
work
3
Special protection mode
Check voltage
Circuit malfunction
1.Check the control load for various relays
Relay disconnect 0.5V
Relay connect 6V
Relay malfunction
22