Bell System Practices 1A1 Maintenance page 4

TABLE A
ELECTRICAL TROUBLE ANALYSIS FOR lAl COIN TELEPHONE
Failures
(See
Note)
Read-I Dial I Refund
Possible Causes Remedial Action
Out Tone
Handset On Switch hook - Deposit 1 Nickle
Plug 1 - Open between pins 4 and 5 Clean SR," contacts or replace cover
Handset Off switchhook - Deposit 2 Nickels or I Dime
Ring side of line open Reconnect as required
C'" contacts or switch SI·
Clean C" or replace chute and total i-
Ko No No
open
zer
- -
- --
Plug 2 - Open at pins 1, 8, 9, 10, or
Replace chute and totalizer
11
As above but hear
Line reversed or tip side
Reconnect as required
sidetone
open
Tit contacts not making
Clean contacts or replace chute and
totalizer
Ko No Yes
Jack 1 - Short pins 4 and 8, and 6
- - Plug I-Open at pin 8 and 10. If then OK on Read-Out and
Refund, replace cover.
Plug 2-0pen at pin 5 Replace chute and totalizer
Yes Yes Yes
Transmitter or cord open Replace as required
But no sidetone
Plug 1 - Open at pin 9 Replace cover
Yes Weak Yes
Plug 1 - Open at pin 1
Replace cover
Yes Yes Yes
Switch Sit not making or plug 2 open
Replace chute and totalizer
at pin 1
But no coin tones
Defective oscillator Replace chassis assembly
Receiver or cord open Replace as required
Yes No Yes
SH, contacts not making Clean contat:l:s or l'eplace cover
-
Plug 1 - Open at pin 1 or 7 Replace cover
Coins return after
SH" contacts not making Clean contacts or replace cover
Read-Out
Plug 1 - Open at pin 2, 6, or 10
Replace cover
T .. ' " contacts open
Clean contacts or replace chute and
Totalizer rotates
totalizer
continuously
Plug 2 - Open at pin 1 or 2 Replace chute and totalizer
Dime tones too fast
CS* contacts open
Clean contacts or replace chute and
totalizer
T"T contacts not making
Clean contacts or replace chute and
Hear coin tones in
totalizer
handset receiver
.
Plug 2 - Open at pin 3
Replace chute and totalizer
Cannot break dial TIT contacts not making or not latch- Clean contacts or replace chute and
tone
ing totalizer
- -
SRIT contacts not m.aking
Clean contacts
Can break dial tone Plug 1 - Open between pins 4 and 8
with HT contacts
or between pin 6 and TBZ terminal Replace cover
shorted
3
- - -
Plug 2 - Open at pins 4 or 6 Replace chute and totalizer
Handset On Switch hook - Deposit 1 Nickel
Y
I
Y
I
Y
I
Tl contacts stay latched after refund
I
R I h t d totalizer
~ ~
es of 2 nickels, dime, or quarter ep ace cue an
If troubles cannot be cleared by above procedures, replace negative start unit (P3 plug).
AQ/e: Failures are shown underlined. Read-out refers to operation of totalizer.
~ormally
closed contacts
(--I- ).
Xormally open contacts
(~).
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n
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