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TURN POWER OFF AND BACK
ON.
CHECK LED DRIVER A3UI2
I AND ASSOCIATED CIRCUITS
CHECK LED DRIVER A3U13
AND ASSOCIATED CIRCUITS.
PROGRAM-
0:
i.i r t
G"
i"'
0
.j
5
F' 4 u V
10 OUTPUT
705
20 END
"P 4 0V G"
TRACE REMOTE SIGNAL
ACROSS ISOLATION {A4U37-2
SHOULD BE LOW, A4U37-4
HIGH) TO A3UI5-3{HIGH). IF
OK, USE S.A. {FIG. 5-6) TO
CHECK A3U15 ADDRESSING
CHECK TRANCEIVERS {FIG. 5-
37). IF ALL OK, CHECK A4U5.
CHECK ATN TRANSCEIVER (FIG.
5-37). IF OK, CHECK CIRCUITS
#1,3,4,6,7 IN ACCOMPANYING
LIST
LISTEN LED
(A4DS1) ON?
CHECK LED DRIVER A3UI3
AND ASSOCIATED CIRCUITS.
CHECK OPTOCOUPLER A4U39
CHECK CIRCUITS #2-5, 788
IN ACCOMPANYING LIST
Figure 5-32.
HP-1B Listen Tests (Sheet 1 of 2)
5-47
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