Bell System Practices TOUCH-A-MATIC 2872A1M Identification, Installation, Connections, Operation, And Maintenance page 52

SECTION 503-603-101
$ TABLE N (Contd) (I
TROUBLE ANALYSIS - 2872AIM OR 2872A2M
TROUBLE
FAILURE ADDITIONAL SYMPTOM POSSIBLE CAUSE REMEDIAL ACTION
NUMBER
, ,,
9 (cont'd) No digits or random AC power outage for Reestablish ac power and
digits in memory 24 hours or longer rerecord numbers into memory
Disconnected or de- 1. Plug in the battery
fective battery 2. Allow the battery to be
charged for a minimum of
5 minutes. Then momentarily
remove the 95B1 power unit
from the ac power outlet and
reinsert
3. If previously stored numbers
are not dialed from memory,
replace the battery
4. Repeat procedure
Defective power Replace telephone set*
supply circuit
No digits or all the same Defective memory Replace memory
digits in random mem-
ory locations
Two or more memory Static discharge 1. Consult your Telco engineer
locations have some damage for proper grounding
digits which are usually procedures
different from originally 2. Replace memory
recorded digits
Automatically dials Defective WAIT con- Replace memory
through a "wait" after tacts or defective cir-
pausing momentarily cult components
at the "wait" space Defective dial tone Replace dial tone detector PWB
on a train of recorded detector assembly of D-18049_3 Kit of Parts
digits (if option is provided ).
10 Cannot manually dial With a strap lead Defective circuit or 1. Check connections per Table
off-hook for ac between screw terminals connections on B, C, D, or E
power failure condi- 10 and 15 on PSB, can D-180492 Kit of 2. Replace D-180492 Kit of Parts
tion manually dial off-hook Parts
for ac power failure
(Wired for speaker- condition
phone option)
11 Cannot turn speaker- Speakerphone indicator Handset off-hook Place handset on-hook
phone on when ON lamp does not turn on,
button is depressed but line lamp is lit.
(Wired for speaker- '
phone option) No dial tone heard, but Line button not Depress line button
indicator lamp turns on depressed
Speakerphone indicator Improper connections 1. Check connections per
lamp does not turn on or defective 85B1 Table B, C, D, or E
and neither does line power unit 2. Check for commercial power
lamp 3. Check that 85B1 power unit
is plugged into commercial
ac power outlet
4. Check or replace 85B1 power
unit (should read 18 to 25
VAC across secondary screw
terminals)
i , , |
*Refer to 6.02 (4).
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