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(b) Reading Circuit (To be checked by Scanning Test)
Check the connection of CN6 (M-1) through CN61 (CIS).
OK
Does SIG (CN6, Pin No. 10) appear normally?
NO
YES
Is GLED (CN6, Pin No. 1) low?
YES
NO
Do the signals (SH (CN6, Pin No. 6) and CL (CN6, Pin No. 3))
——»|
Check the M-1 PCB.
appear normally?
| yes
Check CIS.
(6) Can not enter the Tx./Rx. mode by pressing [START] switch under OFF-HOOK condition
(a) In case of the extension telephone connected to the SFX-11
Check the connection of extension telephone and JK31
(M-3).
YES
NO
Is loop (CN32, Pin No. 1) Low on the NCU PCB (M-3)?
YES
Check the M-1 PCB.
(b) In case of the Built-in telephone
Check the NCU (M-3).
Check the connection of CN41 (M-4) and CN33 (M-3).
OK
Check the connection of CN42 (M-4) and CN34 (M-3).
oO
K
Check the connection of MJ41 (M-4) and handset.
OK
NO
Is /DHS (CN41, Pin No. 5 on M-4) low?
YES
Check the M-1 PCB.
Check the M-4 PCB.
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