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10. TROUBLE SHOOTING
A：NO POWER OUTPUT
Check C12 is with 310V direct
voltage is normal or not
Check switching tube Q1 is with
310V voltage or not.
Check the fourth feet of IC2 is
with around 14V is normal or not.
D25 5.2V,D27 6.5V regular voltage
B: NO DISPLAY
1.Check IC2,IC401&IC403 is with
3.3V voltage output or not
2.Check IC402&IC404 is with 1.8V
voltage output is normal or not
Check X101（32.768KHZ）and
X102(24MHZ)if start oscillation
is normalor not
Check D703,D704,D705,VFD display
drive signal CLK,DATE,STB is
normal or not
Display is OK
YES
YES
YES
YES
YES
YES
NO
Check F1,LF1，
LF2,D13,D14,D16,D17
NO
CheckRS1/RS2,C18,D20,D21,TR3
NO
Check RA4,D4,TR3,IC4
NO
Check D25 and D27 is with 5.2V
and 6.5V voltage or not
YES
Check D25,D27,IC4,U1
Check
NO
X101,X102,R48,R55,R47,C23, etc.
components
Check IC101,CN5 and on display
NO
board IC701,CN702,FFC cabel
NO
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