Sylvania 6842PF M, Service Manual, Page: 4 / 33

1-1-2 L0655EA
1. V-data Adjustment
Note: J2192 (+B), J2169 (GND), VR2350 --- Power
Supply CBA
1. Operate the unit more than 20 minutes.
2. Connect DC Voltmeter to J2192 (+B) and
J2169 (GND).
3. Input an APL 100% white VIDEO signal.
4. Adjust VR2350 so that the voltage of J2192 (+B)
becomes 70 V ± 0.5 V.
2. V-sus Adjustment
Note: J2156 (+B), J2169 (GND), VR2250 --- Power
Supply CBA
1. Operate the unit more than 20 minutes.
2. Connect DC Voltmeter to J2156 (+B) and
J2169 (GND).
3. Input an APL 100% white VIDEO signal.
4. Adjust VR2250 so that the voltage of J2156 (+B)
becomes the specified voltage as shown on the
panel label.
3. White Balance Adjustment
Purpose: To mix red, green and blue beams correctly
for pure white.
Symptom of Misadjustment: White becomes bluish
or reddish.
Notes:
- To only enter the service mode, use service remote
control unit.
- This adjustment should be performed in Video 1
mode.
1. Operate the unit more than 20 minutes.
2. Input the gray scale pattern signal (5 scales) from
Composite AV Input (1) video jack (Video1).
3. Set the color analyzer to the CHROMA mode and
after zero point calibration, for high light adjust-
ment, bring the optical receptor to the 2nd scale as
shown below.
4. Enter the Service mode.
5. Enter the component adjustment mode, press
"VOL
p
" button once on the normal remote control
unit.
Test Point Adj. Point
J2192 (+B),
J2169 (GND)
VR2350
M. EQ. Condition & Remarks Spec.
DC
Voltmeter
AC input: 120V,
Monitor to APL 100%
white VIDEO signal
DC 70 V ±
0.5 V
Test Point Adj. Point
J2156 (+B),
J2169 (GND)
VR2250
M. EQ. Condition & Remarks Spec.
DC
Voltmeter
AC input: 120V,
Monitor to APL 100%
white VIDEO signal
DC Vsus ± 1 V
Vsus: See
Panel Label
(below)
Panel Label
Panel Label information
Serial No.
MADE IN JAPAN
Ve: v, Vsus: v
TQF
Adjustment voltage
Fig. 4
Test
Point
Adj.
Point
Mode Input
Screen
CH
o
/
p
buttons
Video 1
Gray scale
pattern signal
(5 scales)
M. EQ. Spec.
Pattern Generator,
Color analyzer
See below
Figure
Color Analyzer
Fig. 5
Fig. 6
2nd gray scale