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WARNING: Any leakage voltage measurement that
exceeds 0.75 volts rms (0.5 milliamperes AC) consti-
tutes a potential shock hazard and must be corrected.
CAUTION: Some of the ICs used in the monitor are
electrostatic-sensitive devices. These circuits can be
damaged by static electricity. When handling any IC,
use a wrist grounding strap or be sure to equalize the
static charge before touching the IC.
Other Precautions
•
Be sure that all components are positioned in such
a manner as to avoid the possibility of short cir-
cuits.
•
Inspect and correct all soldered connections for
cold solder jOints, frayed leads, damaged insula-
tion, splashed solder, or sharp pOints.
•
Never release a repaired product to a customer
unless all protective devices, such as insulators,
barriers, cover shields, strain reliefs, etc., have
been installed.
•
Remove all loose material from inside the monitor
after servicing.
•
Follow the original lead layout, dress, lengths, and
tension.
•
Replace all components with exact Zenith Data
Systems replacement parts.
Suggested Tools and Supplies
•
1 lA-inch nut driver
•
Flat-blade screwdriver, 1/4-inch blade
Page
4-2
•
Phillips screwdriver, No.1 tip
•
Phillips screwdriver, No.2 tip
•
Diagonal cutters
•
Wire strippers
•
Long-nose pliers
•
Desoldering tool
•
Soldering iron, 25 to 40 watts
•
Solder,
60/40,
HE-331-6
•
Desoldering braid, HE-490-185
•
Cable ties, HE-354-7
•
Lint-free cloths
Test Equipment
•
Oscilloscope -
DC to 100 MHz, dual trace,
triggered sweep. Tektronix Model 465, or equiva-
lent.
•
Logic
probe
-
Capable
of
detecting
10
nanoseconds single pulses, and indicating logic
one, logic zero, and high impedance states. Heath
Model IT -7 410, or equivalent.
•
Digital voltmeter -
High impedance input, zero
to 1000 volts, zero to one megohm. Heath Model
SM-2215, or equivalent.
•
Variable power supply -
Zero to 120 VAC rms,
3 amps Heath Mode11M-521 0, or equivalent.
•
Low capacitance oscilloscope probe -
Input
capacitance adjustable from 15 pF to 50 pF, 4 ns
rise time. Heath Model PKW-1
OS, or equivalent.
•
High voltage probe - Zero to 40 kV. Heath Model
IM-5210, or equivalent.
•
Isolation transformer.
•
Test IC Assembly -
A-14136 (used for trouble-
shooting the touch control system).
Servicing
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