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Model 5245L
6-t.
tNTRODUCTtON.
6
-2.
This sectionprovides
maintenance,
adjustments,
and
troubleshooting information
for
the
Model 5245L
Electronic
Counter.
6.3.
MAINTENANCE.
6-4.
AIR
FILTER.
Inspect the
air
filter
(center of
rear
panel)
regularly
and clean
it
before
it
becomes
dirty
enough
to
restrict air flow.
Proceed as
follows:
a.
Remove
top cover
(unlock the
two quarter turn
fasteners
and
slide cover to the rear).
b.
Remove
four
screws holding
filter
in
place.
c.
Wash
filter
in warm water
and
detergent.
d.
Allow
filter
to
dry
completely.
e.
DO
NOTAPPLY ANYCOATING
COMPOUND TO
NON-METAL FILTERS. Coat metal
filters
with light
film
of
filter oil.
We
recommend No. 3
Filter
Coat
from
Research
Products Company. This adhesive is
available in"Handi-Koter" sprayer cans at inost heat-
ing
supply
stores or from your Hewlett-Packard field
office.
6-5.
FUSE
REPLACEMENT. Table 6-1 lists
fuse
rating
and HP
Part No.
for
proper
operation with
either
115V
or
230Vac.
Section
VI
Paragraphs 6-1 to 6-10
6-6.
FAN
MOTOR.
TVo drops of light
machine
oil
should be applied
to the fan motor
shaJt
once
a
year.
6.7.
TEST EQUIPNIENT.
6-8.
Recommended
test
equipment
for
adjustments
and
troubleshooting
is
listed in Table
6-2.
Test in-
struments other thanthose listed maybe
used
if
their
specifications
are
equal
to or
exceed
the required
characteristics.
6-9.
ASSEiIBIY
CONNECTTON
I
D
ENTI
FICATIO N.
6-10.
Throughout
the manual, connections to printed
circuit
assemblies are
referred
to in
abbreivatedform.
For
example,
the connection to pin
15
of
assembly
A6
is
.a.6(15).
SECTION
YI
ADJUSTffTENT
AND
TROUBTESHOOTING
Table
6-1.
Fuse
Replacement
Conversion
115
Volt
230
Volt
Slide switch
Left
("
115")
Right
("230")
AC
LINE
FUSE
2
ampere
slow-blow
(HP
2110-0006)
1
ampere
slow-blow
(HP
2110-oo0?)
Table
6-2.
Recommended
Test Equipment
Instrument
Type
Required Characteristics
Use
Instrument
Recom..
Oscilloscope
50
MHz
bandwidth, dual trace plug-
in,
ext sync capability
Observe
waveforms
HP Model
175.4'
duringtroubleshoot-
Oscilloscope
ing
and
adjustment.
HP Model
1?50A DuaI
Performance
Check.
Trace
Vertical
Ampl
HP AC-21C Voltage
Divider Probe
(twa)
HP
10003A 10:1
Probe
Test Oscillator
Continuously
variable
from l0
Hz
to
50
MHz,
100
mV
output
Performance
Check
HP Model
2048
Adjustments
Oscillator
Troubleshooting
HP Model 606A Test
Oscillator
Low Frequency
Generator
Continuously
variable
from
2
Hz
to
10
Hz,
100
mV
output
Performance
Check
HP Model
2024' Low
Troubleshooting
Frequency Function
Generator
Pulsb Generator
1 psec
wide, 1V
negative,
l
kHz
repetition rate
Performance
Check
HP Model
?LZA
Pulse
Troubleshooting
Generator
DC
Voltmeter
0V
to * 1?0V,
10
megohm
input
impedance,
l%o
accutacY
Troubleshooting
HP
Model 4t2A
Adjustments
Digital to
Analog
Converter
L-2-2-4
BCD
code
Performance
Check
HP Modet
581A
Troubleshooting
Strip-Chart
Recorder
Performance
Check
Moseley
680A'
Troubleshooting
02349-1
6-1
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