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Disassembly and Reassembly
43-5 Chassis Reassembly
1, Close the SNAPIN door.
:
Place the chassis bracket (b) onto (a) on the bottom of the front cabinet.
Push the bracket into the hole (a) until a "click"
is heard.
Check that the SNAPIN door opens and closes.
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N
F/CABINET
HOLDER-CHASSIS
Fig. 4-8
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Samsung Electronics
Alignment and Adjustments
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5. Alignment and Adjustments
5-1 General Alignment Instructions
1. Usually, a color TV-VCR needs only slight
touch-up adjustment upon installation. Check
the basic characteristics such as height,
horizontal and vertical sync and focus.
2. Observe the picture for good black and white
details. There should be no objectionable color
shading; if color shading is present,
demagnetize, perform purity and convergence
adjustments described below.
3. Use the specified test equipment or its
equivalent.
4. Correct impedance matching is essential.
5-2 Automatic Degaussing
. Avoid overload. Excessive signal from a sweep
generator might overload the front-end of the
TV. When inserting signal markers, do not
allow the marker generator to distort test
results.
. Connect the TV only to an AC power source
with voltage and frequency as specified on the
backcover nameplate.
wires while the TV is turned'on. Make sure
that the power cord is disconnected before
replacing any parts.
. To protect against shock hazard, use an
isolation transformer.
A degaussing coil is mounted around the
picture tube, so that external degaussing after
moving the TV should be unnecessary. But the
receiver must be properly degaussed upon
installation.
The degaussing coil operates for about 1 second
after the power is switched ON. If the set is
moved or turned in a different direction, the
power should be OFF for at least 10 minutes.
5-3 High Voltage Check
If the chassis or parts of the cabinet become
magnetized, poor color purity will result. If
this happens, use an external degaussing coil.
Slowly move the degaussing coil around the
faceplate of the picture tube and the sides and
front of the receiver. Slowly withdraw the coil
to a distance of about 6 feet before turning
power OFF.
If color shading persists, perform the following
Color Purity and Convergence adjustments.
CAUTION: There is no high voltage adjustment on this
chassis. The B+ power supply should be +130 volts
(with full color- bar input and normal picture level).
1. Connect a digital voltmeter to the second anode
of the picture tube.
2. Turn on the TV. Set the Brightness and
Contrast controls to minimum (zero beam
current).
3. Adjust the Brightness and contrast controls to
both extremes. Ensure
that the high voltage
does not exceed 32 KV under any conditions.
Samsung Electronics
5-1
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