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HP HP-97 - Page 108

HP HP-97
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Component-Level
Maintenance
HP-97
Table
4-14,
Printer
PCA
Troubleshooting
Procedure
(Continued)
STEP
ACTION
10.
Press
the
paper
advance
switch.
11.
Check
to
see
if
the
motor
reverses.
12.
Press
0,
1,
2,....9
[PRINT
x]
13.
a.
Check
pin
5
of
the
board
for
the
STB
signal.
b.
Measure
pin
2
of
U5.
If
the
paper
advances,
go to
step
11.
If
not,
replace
in
order
Q14,
ul,
Q13,
R1,
R2.
Then
go to
step
11.
If
so,
go
to
step
12.
If
not,
replace
in
order
Q13,
U1,
R1
and
R2.
Then
go
to
step
12.
If
the
print
intensity
1is
ac-
ceptable,
go
to
step
14.
If
not,
go
to
step
13.
STB
signal
should
be
of
100+-
15
microseconds
duration.
Pin
2
should
measure
3.95+-
0.05
Vdc.
If
both
are
so,
select
value
of
R8
for
acceptable
print
inten-
sity.
For
darker
print,
increase
resistance.(Refer
to
table
4-7)
For
lighter
print,
decrease
resistance.
Then
go
to
step
14,
If
not,
replace
U4,
U5,
and
RS
in
order.
Then
go
to
step
14.
4-40

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