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MA INTENANCE SUGGESTI ONS
Your PACO TRANSISTOR TESTER can fulfill continuous daily service requirements for
many years. However, to fully realize these capabilities, the same degree of care in operation
and maintenance should be accorded your instrument that would be given any fine piece of equip
ment.
It
is always possible that repairs will be necessary. Should your TRANSISTOR TESTER
need servicing, you will encounter little or no difficulty if you simply apply the same process
of elimination you use in troubleshooting any electronic circuit. The checks outlined under
"COMPLETE CHECK-OUT PROCEDURE," as well as the information presented under "BASIC
CIRCUIT FUNCTIONS," will aid you considerably. Proper operating voltages are shown on the
schematic. These may very up to
±
10% and still be acceptable.
Should you suspect failure of the meter movement coil, the continuity may be checked with
an ohmmeter
if
a limiting resistor of approximately 10K ohms is first connected in series wIth
the ohmmeter test leads. NEVER directly test meter coil continuity with an ohmmeter. This
could "burn -out" the coil from excessive ohmmeter battery current.
Should this occur, the
meter must be replaced.
Do not attempt to repair the meter coil, as this automatically voids our warranty.
Should the plastic meter cover become damaged, you can obtain a separate replacement
cover from PACO Electronics Co.
To remove the cover, insert a small screwdriver or knife blade under one of the upper
corners and gently pry upwards. Being a friction fit, the cover should pop right off.
When installing a new cover, be careful to properly engage the small plastic stud on the
cover with the slotted zero adjust lever on the meter movement.
Do not leave the meter movement exposed to air for any length of time. Accumulations
of dust and other foreign matter can seriously harm this delicate instrument.
If
you must re
move the plastic cover for any length of time, protect the movement in some way, such as by
enclosing in a box.
The plastic cover rriay occasionally, through repeated polishing or cleaning, accumulate
charges of static electricity. This will cause the pointer to deflect erratically with the instru
ment turned on or off. Static charges may be removed with one of the commercially available
anti -static solutions or a solution of any good liquid detergent (the kind used for washing dishes)
and water. Simply dip a clean, soft cloth in the solution and wipe the surface of the meter cover.
The cover need not be removed for this.
Faulty operation of your TRANSISTOR TESTER may often be traced to the test leads,
especially after long use. Their maintenance, therefore, should not be ignored. Check the leads
frequently and carefully for breakage, soldered connections developing resistance, etc.
NOTE: See page 37 for SPECIAL SUBSCRIPTION SERVICE on Test Data Sheets.
Page 35
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