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Model 5304A
Maintenance
S E C T I O N I X D
5 3 0 4 A T I M E R / C O U N T E R
S U B S E C T I O N V
M A I N T E N A N C E
9 D - 5 - 1 . INTRODUCTION
9D-5-2.
This section contains maintenance and
service information for Model 5300A/5304A Timer/
Counter. Included are performance check procedures
and tests to localize, isolate, and locate defective
components.
9 D - 5 - 3 . RECOMMENDED TEST E Q U I P M E N T
9D-5-4.
Test equipment recommended for perform-
ance
checks,
maintaining,
troubleshooting
and
servicing the 5300A/5304A Timer/Counter is listed
in Table 5-1 of 5300A portion of the manual.
Test
equipment with equivalent characteristics may be
substituted for equipment listed.
9 D - 5 - 5 . I N S T R U M E N T A C C E S S
9D-5-6.
For access to plug-on assembly, separate
the 5300A from the 5304 A as follows:
a. Turn ac power OFF and disconnect power
cord.
b. Pull the two-side casting latches fully rear-
ward (it is necessary to press the latch handles
gently away from the center of the instrument to
unlock them).
c. When latches are fully extended rearward, the
5300A and 5304A castings should be separated by
cbout '/g-inch.
d. Lift the 5300A gently away from the 5304A.
e. Separate 5304A Al BOARD ASSEMBLY from
5304A casting as follows (refer to Figure 9D-5-1):
1.
Press rear, plastic-nylon retaining clips on
each side of 5304A casting and lift the rear
of the Al Board Assembly to release it
from the casting.
2.
Press front plastic-nylon retaining clips on
each side of 5304A casting and lift the front
of the Al Board Assembly to release it
from the casting.
3.
Lift Al Board Assembly from the casting.
f. Mate the 5304A, Al Board Assembly to 5300A
and reapply ac power.
g. To reinstall the Al Board Assembly into the
casting reverse procedure of steps d through f.
9 D - 5 - 7 . PERIODIC MAINTENANCE
9D-5-8.
To determine if the 53O0A/53O4A is oper-
ating properly within specifications, perform the In-
Cabinet Performance Checks listed in Table 9D-5-1.
These checks may also be used for the 5300A per-
formance checks when the 5300A/5304A combination
is used.
9 D - 5 - 9 . MAINTENANCE A N D REPAIR
9D-5-10. BOARD REMOVAL.
When removing the
printed circuit board for replacement, repair, or
servicing, always remove ac power and separate
the board from the casting using Paragraph 9D-5-6
steps a to e.
9D-5-11.
COMPONENT REPLACEMENT.
When
replacing a circuit board component use a low heat
soldering iron.
Heat must be used sparingly as
damage to the circuit foil may result.
Mounting
holes may be cleaned out with a toothpick while
heat is applied. Connection should be cleaned with a
cleaning solution
after component
removal
and
replacement.
9D-5-12. INTEGRATED CIRCUIT REPLACEMENT.
Two
methods
are
recommended
for
removing
integrated circuits:
a. Solder Gobbler.
Solder is removed from
board by a soldering iron with a hollow tip con
nected to a vacuum source.
The IC is removed
intact so it may
be reinstalled
if diagnosis is
wrong.
b. Clip-Out.
This method is used when an IC
is proven defective. Clip leads close to case, apply
heat and
remove leads with
long
nose
pliers.
Clean board holes with a toothpick and cleaning
solution.
9 D - 5 - 1 3 . I N S T R U M E N T TROUBLESHOOTING
9D-5-14.
Trouble isolation can
best be accom-
plished by first obtaining all possible information
from the controls, connectors, and indicators on the
5300A and 5304A, then logically using this infor-
mation to locate the defective component.
If the
9D-5-1
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