OKIFAX 610, Service Handbook

Page: 47 / 147

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5.2.1 HALF OF LCD DISPLAY FULL BLACK AFTER POWER ON AND KEY
FAILED (610 only)
Check if Clock of XFC U1
133 is 19MHz
Check if the signals DATA,
ADDR BUS, CS, RD, WR
of U11 are normal.
Yes
Check if U11(ROM)
inserted normal
Yes
No
No
Check U1-2,4,5
Insert anew
Check if XFC Reset signal
normal
Yes
No
Check if X4 (Crystal)
R180, C98, C99, C109,
L12 normal
Yes
Check U24 -70
Solder anew or replace
No