Service manual

3-9
NO
YES
YES
YES
(3) No 3.3V
NO 3.3V.
Is there about 3.5V at
the IC155/IC156 Pin1?
Is there about 4.5~5V at
the IC155/IC156 Pin1?
Check or Replace
the IC155/IC156.
Check or Replace
the D123/D124.
NO
Check the µ-com pin
PWR CTL signal
NO
YES
YES
YES
(4) No 12V
NO 12V.
Is there about 14V at
the IC157/IC158 Pin1?
Is there about 4.5~5V at
the IC157/IC158 Pin4?
Check or Replace
the Q157/IC158.
Check or Replace
the D125/D126.
NO
Check the µ-com pin
PWR CTL signal