Electrical Adjustment Instructions - Sylvania CD202SL8 Service Manual

ELECTRICAL ADJUSTMENT INSTRUCTIONS

General Note:
"CBA" is abbreviation for "Circuit Board
Assembly."
NOTE:
Electrical adjustments are required after replacing
circuit components and certain mechanical parts.
It is important to perform these adjustments only
after all repairs and replacements have been com-
pleted.
Also, do not attempt these adjustments unless the
proper equipment is available.
Test Equipment Required
1. NTSC Pattern Generator (Color Bar W/White Win-
dow, Red Color, Dot Pattern, Gray Scale, Mono-
scope, Multi-Burst)
2. AC Milli Voltmeter (RMS)
3. DC Voltmeter
4. Oscilloscope: Dual-trace with 10:1 probe,
V-Range: 0.001~50V/Div,
F-Range: DC~AC-60MHz
5. Frequency Counter
6. Plastic Tip Driver
7. Color Analyzer
How to make the service remote
control unit:
1. Prepare the remote control unit (Part No.
NE241UD). Remove 4 screws from the back lid.
(Fig. 1)
SCREW
Remote control unit (Bottom)
2. Cut off pin 10 of the remote control microprocessor
and short circuit pins 10 and 17 of the microproces-
sor with a jumper wire.
How to enter the Service mode:
Service mode:
1. Use the service remote control unit.
2. Turn the power on.
3. To change TV/VIDEO mode or DTV mode, press
[SELECT] button on the remote control unit.
4. Press [DISC MENU] button on the service remote
control unit. Version of micro computer will be
displayed on the CRT. (Ex: A14-0.34)
1. DC 114V (+B) Adjustment
Purpose: To obtain correct operation.
Symptom of Misadjustment: The picture is dark and
the unit does not operate correctly.
Test point
J1558(+B)
GND
Tape
---
Note:
J1558 (+B), VR1601 --- Main CBA
1. Connect the unit to AC Power Outlet.
2. Connect DC Volt Meter to J1558 (+B) and GND.
3. Adjust VR1601 so that the voltage of J1558 (+B)
becomes +114±0.5V DC.
Fig. 1
6-1
Adj. Point Mode
VR1601 ---
M. EQ. Spec.
DC Voltmeter
+114±0.5V DC
Plastic Tip Driver
Input
-----
P7450EA