Bell System Practices TOUCH-A-MATIC 2872A1M Identification, Installation, Connections, Operation, And Maintenance page 51

ISS 5, SECTION 503-603-101
$ TABLE N (Contd) 41
TROUBLE ANALYSIS - 2872AIM OR 2872A2M
, , , ,
TROUBLE
FAILURE ADDITIONAL SYMPTOM POSSIBLE CAUSE REMEDIAL ACTION
NUMBER
8 Cannot record Warble tones heard when WAIT contacts closed Replace memory
_)roperly into the 31 automatically dialing, even when WAIT
memory positions or Get "cannot complete" button is not
into the LAST intercept for automatic depressed
NUMBER DIALED or manual dialing
position
Switch of D-180818 Change switch position to OFF
Kit of Parts in ON
position
Party is reached when Incorrect dial Replace dial
number is recorded as it contact sequence
is manually dialed. '
Defective logic Replace memory
However, when number
is subsequently dialed Open circuit on PSB Replace telephone set*
from memory, party
is not reached -- wrong
number is dialed from
memory
9 Cannot dial properly Did not record 1. Record per 5.01
from memory properly 2. See No. 7
MB7 relay does not Battery not plugged Plug battery in
operate (no clicking in (2872A2M tel
sound heard) when set)
memory button is Memory not securely Tighten memory mounting
depressed. No audi- mounted screws
ble TOUCH-TONE
signal present Open circuit in Check for proper strap lead
power path connections on PSB.
See Fig. 9 [B]
Defective logic Replace memory
Defective line Replace telephone set*
switch h-i contacts
MB7 relay operates Incorrect dial Replace dial
(clicking sound heard) sequence
but holds for less than
0.1 second for a 15
digit number
No audible TOUCH-
TONE signal present
Audible gap in train of
digits being dialed
_
Digits dialed too rapidly Noise on ac power Minimize wire length between
(fast dialer) line (2872AIM) 95B1 power unit and telephone
set.
Defective power Replace telephone set*
supply PWB
assembly (2872A2M)
* Refer to 6.02 (4).
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