Electrical Adjustment Instructions - Sylvania 6509DD Service Manual

ELECTRICAL ADJUSTMENT INSTRUCTIONS

General Note:
"CBA" is abbreviation for "Circuit Board
Assembly."
NOTE:
Electrical adjustments are required after replacing cir-
cuit components and certain mechanical parts.
It is important to perform these adjustments only after
all repairs and replacements have been completed.
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
How to make service remote control
unit:
1. Prepare remote control unit. (Part No. NE200UD or
NE207UD) Remove 4 screws from the back lid.
(Fig. 1-1)
SCREW
Remote control unit (Bottom)
2. Remote control unit: Part No. NE200UD or
NE207UD
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 Set up the Service mode:
Service Mode:
1. Use the service remote control unit.
2. Turn the power on.
3. Press "DISC MENU" button on the service remote
control unit.
1a. DC 117V (+B) Adjustment
(AC Power)
Purpose: To obtain correct operation.
Symptom of Misadjustment: The picture is dark and
unit does not operate correctly.
Test point
J109 (+B)
TP1303 (GND)
Tape
---
Note: J109 (+B) --- HV/DC Power Supply CBA
TP1303 (GND), VR1601 --- Main CBA
1. Connect the unit to AC Power Outlet.
2. Connect DC Volt Meter to J109 (+B) and TP1303
(GND).
3. Adjust VR1601 so that the voltage of J109 (+B)
becomes +117±0.5V DC.
Fig. 1-1
1-7-1
Adj. Point Mode
VR1601 ---
M. EQ. Spec.
DC Voltmeter
+117±0.5V DC
Plastic Tip Driver
Input
-----
TD001EA