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(7) No Dial out
is the position of the Dial selection switch correct?
OK
DP
Which can not be dialed, DP or Tone?
TONE
Check the Tone related circuit.
(a) In case of the TONE dialing
.
NG
Does the T/R LINE (CN3-1, Pin No. 10 on M-1) appear
normally?
OK
| Check the NCU (M-3).
|
(b) In case of the DP dialing
NG
Does the DP (CN3-1, Pin No. 15 on M-1) appear normally?
OK
Check the DP generation Circuit
Check the M-1 PCB.
Check the M-1 PCB.
Check the NCU (M-3).
Check the line connection
YES
Is it possible to transmit the protocol signals like a DCS,
DIS and so on?
| YES
NO
Can the protocol signals (300BPS) be received from the
party?
YES
:
NO
Can the high speed signals (9600, 7200, 4800 and
Check the NCU M-3.
2400BPS) be received?
YES
Check the M-1 PCB
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