HP 5501A Operating And Service Manual page 249

Table 6-4. English/Metric Pulse Output Electronics System Troubleshooting (Cont'd)
I
I
TEST C:
10760
GENERAL PURPOSE COUNTER TEST
I
Equipment needed: logic clip or logic probe
Test procedure: Jumper 10763 as per Table 6-4c
Send "startJJ pulse
Compare 10760 counter output with Table 6-4h
Table 6-4h : 10760 Counter Output Check
0/1
=
constantly changing
10760 Counter Output
T EST
D
: 10761 BINARY MULTlPLlER
10763 FREQUENCY
CARD COUNTER
JUMPERS OUTPUT
1.6MHz 175
Inch<
800KHz 257
1 . 6 ~ ~ 2 437
mmc
800KHz 665
Equipment needed : logic clip or logic probe
Test procedure: Jumper 10763 as per Table 6-4c
Send "start" pulse
Compare 10761 output with Table 6-4i. The number in the10761 buffers i s the binary
representation of the number that is read on the frequency counter (within
a
*
1
tolerance).
Table 6-4i: 10767 Output Buffer Check
U51
plns
7 6 2 3
0 0 0 0
0 0 0 0
0 0 0 0
0 0 0 0
U 42
plns
7 6 2 3
0 0 0 0
0 0 0 0
0 0 0 0
0 0 0 0
U52
pins
7 6 2 3
0 0 0 0
0 0 0 0
0 0 0 0
0 0 0 0
0/1 constantly changing
10763
Sw~tches
and
Jumpers
1.6MHz
Inch<
800KHz
1.6MHz
metric<
800KHz
Inch< 1.6MHz
U 43
plns
7 6 2 3
0 0 0 1
0 0 0 1
0 0 0 1
O O O I A I O I O
Freq.
Counter
Output
175
257
444
652
5276
U 53
p ~ n s
7 6 2 3
0 0 0 1
1 0 0 1
0 0 0 1
U54
plns
7
6
2 3
0 1 1 0 / 1
l O / l O / l O / l
o o n o / l o / l
0 1 0 0
I.C.: U64 U63 U64 U63 U64 U63 U64 U63 U64 U63 U64 U63
Pln: 2 2 4 4 6 6 10 10 12 12 14 14
(174) 0 0 0 0 0 0 0 0 1 0 1 0
(256) 0 0 0 0 0 0 0 1 0 0 0 0
(443) 0 0 0 0 0 0 0 1 1 0 1
(651) 0 0 0 0 0 0 1 0 1 0 0 0
[ I deadpath s w ~ t c h up]
(5275) 0 0 0 1 0 1 0 0
1
0 0 1
U65
6 2 10 4
1 1 1 0
0 0 0 0
1 1 0 1 1
1 0 1 1
1 0 1 1