Focus Adjustment - Sylvania CD202SL8 Service Manual

8. Sub-Brightness Adjustment
Purpose: To get proper brightness.
Symptom of Misadjustment: If Sub-Brightness is
incorrect, proper brightness cannot be obtained by
adjusting the Brightness Control.
Test Point Adj. Point
[CH. o / p]
---
buttons
Tape M. EQ.
Pattern
---
Generator
Figure
White
Note: SMPTE Setup level --- 7.5 IRE
1. Enter the Service mode.
Then input SMPTE signal from RF Input.
2. Press [PICTURE] button on the service remote
control unit and select "BRT" mode. (Display
changes "BRT," "CNT," "CLR," "TNT," "V-TNT," and
"SHP" cyclically when [PICTURE] button is
pressed.) Press [CH. o / p] buttons so that the bar
is just visible (See above figure).

9. Focus Adjustment

Purpose: Set the optimum Focus.
Symptom of Misadjustment: If Focus Adjustment is
incorrect, blurred images are shown on the display.
Test Point Adj. Point
--- Focus VR
Tape M. EQ.
Pattern
---
Generator
Note: Focus VR (FBT) --- Main CBA,
FBT= Fly Back Transformer
1. Operate the unit more than 30 minutes
2. Face the unit to the East and degauss the CRT
using a degaussing coil.
3. Input monoscope pattern.
4. Adjust the Focus VR on the FBT to obtain a clear
picture.
Mode Input
SMPTE
RF
7.5IRE
Spec.
See below
Black
This bar
just
visible
Fig. 4
Mode Input
Mono-
---
scope
Spec.
See below
6-5
10. H f Adjustment
0
Purpose: To get correct horizontal frequency.
Symptom of Misadjustment: If H f
incorrect, skew distortion will appear on the screen.
Test Point Adj. Point
[CH. o / p]
R1583
buttons
Tape M. EQ.
Frequency
---
Counter
Note: R1583 --- Main CBA
1. Connect frequency counter to R1583 and ground.
2. Set the unit to the VIDEO mode which is located
before CH2 and no input is necessary.
3. Operate the unit for at least 20 minutes.
4. Enter the Service mode in TV/VIDEO mode.
5. Press [2] button on the service remote control unit
and select H-ADJ mode.
6. Press [CH. o / p] buttons on the service remote
control unit so that the display will change "0" ~ "7."
7. At this moment, choose display "0" ~ "7" when the
frequency counter display is closest to 15.734
kHz±300Hz.
adjustment is
0
Mode Input
Video ---
Spec.
15.734kHz±300Hz
P7450EA