Sanyo SFX-33 Service Manual page 23

(b) Printing Circuit (To be checked by Scanning test, see page 33)
Check the connection of CN6 (M-1 ) and CN61 (M-6)
YES
Check the connection of CN63 and CNCIS (CIS)
+
YES
YES
Does VIDEO (CN6, pin No.1 O) appear normal ?
J
YES
NO
Is GLED (CN6, pin No.2) low?
i
YES
NO
Do the signals (S1 (CN6, pin No.5) and CLK (CN6, pin No.3)) appear normal ?
1 ! 1
Check CIS Check the M-1 PCB
(6)
Can not
enter the TxJRx. mode by pressing [STARTl switch under OFF-HOOK condition
(a) In case of the extension telephone connected to the SFX-33
Check the connection of extension telephone and MJ42 (M-4)
YES
NO
Is HS (CN31, pin No.8) low on the NCU PCB (M-3) ? Check the NCU (M-3)
I
Check the M-1 PCB
(b) In case of the Built-in telephone
I Check the connection of CN31 (M-3) and CN3 (M-1 )
I
4
OK
Check the connection of MJ43 (M-4) and handset
OK
NO
ls/DHS (CN41, pin No.7 on M-4) low ?
Check the M-4 PCB
1~
YES
Check the M-1 PCB
I
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