Sylvania 6520FDE Service Manual page 23

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 Control
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 us-
ing a degaussing coil.
3. Input the Monoscope Pattern.
4. Adjust the Focus Control on the FBT to obtain clear
picture.
Mode Input
Mono-
RF
scope
Spec.
See below
1-6-6
10. H f o Adjustment
Purpose: To get correct horizontal frequency.
Symptom of Misadjustment: If H f 0 adjustment is in
correct, skew distortion will appear on the screen.
Test Point Adj. Point
CH o / p button
R1583
["H-ADJ"] MODE
Tape M. EQ.
Frequency
---
Counter
Note: R1583 --- Main CBA
Use Service remote control unit.
1. Connect Frequency Counter to R1583 and ground.
2. Set the unit to the VIDEO mode which is located be-
fore CH2 and no input is necessary. Enter the Ser-
vice mode. (See page 1-6-1.)
3. Operate the unit for at least 20 minutes.
4. Press "2" button on the Service remote control unit
and select H-ADJ mode.
5. Press "CH o / p" button on the Service remote con-
trol unit so that the display will change "0" ~ "7." At
this moment, Choose display one of them from "0"
~ "7" when the Frequency Counter shows 15.734
kHz±300Hz or closer.
6. Turn the power off and on again. (Main Power but-
ton on the TV unit.)
Mode Input
---
Spec.
15.734kHz±300Hz
T9000EA