Bell 6B KTS Manual page 54

Key telephone system
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SECTION S 1 8-4 1 1 - 1 00
Page 5 4
BSP S18-411- 100-i01 1978-08-5 4.jpg
DEPRESS
STEP SWITCH
YES
END OF
TEST
b
Fig. 30-Test B Sequence-Alert Time-out
Scanned by Frank Harrell, (Cowboy Frank) Castle Rock, Colorado Oct 15, 2012 21:14:31
NO
DISPLAY
BLANK
YES
REPLACE 485A OR
486A KTU OR REMOVE
4B4A KTUs ONE AT
A TIME UNTIL DISPLAY
SHOWS
REPLACE
b.
DEFECTIVE KTU .
IF A IS DISPLAYED
DEPRESS SWITCH
AGAIN. IF A STILL
DISPLAYED , START
FROM PREPARATION.

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