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HP 82T13A
Troubleshooting/Testing
8. Press the reset
button on the
signature analizer
probe.
9. Probe J1 pin 10.
The signature 197C should be shown. If not,
go back to step 1 and reperform the
initialization routine.
The signature TH68 should be shown. If not,
go back to step 1 and reperform the
initialization routine.
TROUBLESHOOTING
1. Probe all 20 leads
of J1,
U25,
and U13
pin 12 (7CF3)
comparing the
signatures found to
those in figures
5-1,
and 5-2.
If any of the signatures are not correct, be
sure the 75 has been initialized correctly.
If the initialization was performed correctly,
then using figure 7-2,
the method described in paragraph 5-6.
locate the bad IC using
PINS
2
3
u
6
T
8
10
11
12
14
15
16
18
19
20
Figure 5-1.
TYPE
SIGNATURE
CLOCK
1
VI (+5v)
197C
phase 1
GND
0000
phase 1
DT
0877
phase 1
D6
UA20
phase 1
5
D5
P49H
phase 1
D4
P561
phase 1
D3
189C
phase 1
D2
0138
phase 1
9
D1
8UAB
phase 1
DO
TH68
phase 1
PH. 2 CLK
197C
phase 1
PH. 1 CLK
197C
phase 2
13
PWO (+5v)
197C
phase 2
LMA
26AU
phase 2
RD
62C8
phase 2
WR
HF UC
phase 2
17
SEND
————
GND
0000
phase 1
S2 (GND)
0000
phase 1
S1
(+5v)
197C
phase 1
Connector (J1) Signal Table
5-9
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