Trouble Shooting Forcircuit - Sanyo SFX-33 Service Manual

5-3. Trouble shooting for circuitry
(1)
No LCD light when Power is turned ON.
I Check the connection of CN7 (M-1 ) and CN71 (M-7)
I
t
YES
NO
Check pin No. 12 of CN7 (M-l), +5V ? Check Power Supply (M-7)
I
+
YES
I Check the connection of CN22 (M-2) and LCD connector
NO
Check the Main PCB (M-1)
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.,
(2) Key-in is impossible from the operation panel.
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Check the same as described (1)
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I
i
YES
NO
Check the connection of CN2 (M-1 )
Check the Main PCB (M-1)
I
+
YES
I Check the operation panel PCB (M-2)
I
(3) LCD indicates "CHECK PAPER ROLL".
Is recording paper set properly?
I
t
YES
Is the Receiving cover closed securely ?
I Check the connection of CN5 (M-1 )
+
YES
NO
Is /PAP (CN5-pin No.4) less than 0.5V ? Check the reception mecha PCB (M-5)
I I I
I
I I
t
YES
t
I [ 1 I
Check the M-1 PCB Check the recording paper SW on the M-5 PCB
I
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