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