Emerson Magnavox EWC20D5 Service Manual page 27

10. C-Trap Adjustment
Purpose: To get minimum leakage of the color signal
carrier.
Symptom of Misadjustment: If C-Trap Adjustment is
incorrect, stripes will appear on the screen.
Test point Adj. Point
D1311
CH o / p
Cathode
buttons
(B-OUT)
Tape M. EQ.
Oscilloscope
---
Pattern Generator
Figure
minimum
Note: D1311 Cathode (B-Out)--- Main CBA
1. Connect Oscilloscope to D1311 Cathode.
2. Input a color bar signal from RF input.
Enter the Service mode. (See page 1-7-1.)
3. Press "0" button on the remote control unit and
select C-TRAP Mode.
4. Press "CH o / p" buttons on the remote control
unit so that the carrier leakage B-Out (3.58MHz)
value becomes minimum on the oscilloscope.
5. Turn the power off and on again.
11. 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.
Mode Input
--- Color Bar
Spec.
---
Note: R1583 --- Main CBA
Fig. 4
1-7-5
Test Point Adj. Point
CH o / p button
R1583
["H-ADJ"] MODE
Tape M. EQ.
Frequency
---
Counter
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 1-7-1)
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
TD808EA