TROUBLE SHOOTING
1. The unit does not power on.
Check that [XP1: 3,4pin] is 15V.
Yes or no？
Check that [U2 : 4pin] is about 5.1V and R137 is
about 3.9V.
Yes or no？
Replace PCBA on MAIN PCB.
Replace the SMPS PCB.
Replace the KEY PCB.
YES
YES
NO
NO
YES
Check the [24pin FFC cable] and confirm that it is
connected to the MAIN PCB.
Yes or no?
Reconnect or use a new [24pin FFC cable] instead.
NO
2. Keys do not work
Reconnect or use a new [24pin FFC cable] instead.
Replace the KEY PCB.
Replace the MAIN PCB.
Check the [24pin FFC cable] and confirm that it is
connected to the MAIN PCB.
Yes or no?
Replace the old KEY PCB with a new one so that
the EUT functions.
Yes or no？
Replace the old MAIN PCB with a new one so that
the EUT functions.
Yes or no？
YES
NO
NO
YES
YES
51
Before Servicing
This Unit
Electrical
Mechanical
Repair Information
Updating
