OKIFAX 610, Service Handbook

Page: 50 / 147

??5
5.3.2 LCD DISPLAY NORMAL ON STARTING BUT KEY FAILED (660 only)
Check if there is signal
SYSCLK of Y1 - 5
SYSCLK no:Check R166,
C110, Y1
Check if there is output
signal in U1 -57
Check if there is output
signal in STP of U1 - 38
to 47
Yes
Yes
Check soldering of U1
Check if there is output
signal in U1 -144
Yes
No
Check soldering of U1
No
No
Check U1
Yes
Solder anew No
Check U1 - 52 while
pressing [PLAY] key
Yes
No
Check soldering of U12
Check key board
Yes
No
Check soldering of U1