Focus Adjustment - Emerson SC319C Service Manual

9. 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: SYMPTE Setup level --- 7 IRE
1. Enter the Service Mode. (See page 1-4-1.)
Then input SYMPTE signal from RF input.
2. Press MENU button. (Press MENU button then dis-
play will change B R T, C N T, T N T, V-T and
SHP). Select BRT and press CH o / p buttons so
that the bar is just visible (See above figure).
3. Turn the power off and on again.

10. Focus Adjustment

Purpose: Set the optimum Focus.
Symptom of Misadjustment: If Focus Adjustment is
incorrect, blurred images are shown on the display.
Mode Input
SYMPTE
---
7.5IRE
Spec.
Note: Focus VR (FBT) --- MAIN CBA
See below
1. Operate the unit more than 30 minutes.
2. Face the unit to the East and degauss the CRT
3. Input the monoscope pattern.
4. Adjust the Focus Control on the FBT to obtain clear
Black
11. Head Switching Position Adjustment
This bar
just
Purpose: Determine the Head Switching Point during
visible
Play back.
Symptom of Misadjustment: May cause Head
Fig. 4
Switching Noise or Vertical Jitter in the picture.
Note: Unit reads Head Switching Position automati-
cally and displays it on the screen (Upper Left Corner).
1. Playback test tape (FL8A, FL8N).
2. Enter the Service Mode. (See page 1-4-1.)
3. The Head Switching position will display on the
4. Press "CH o" or "CH p" button on the remote con-
5. Turn the power off and on again.
12. CCS Text Box Location
When replacing the CRT, the CCS Box might not stay
in appropriate position. Then, replace micro computer.
Note: This adjustment automatically done by the
microcomputer.
1-7-5
Test point Adj. Point
--- Focus Control
Tape M. EQ.
--- Pattern Generator
FBT= Fly Back Transformer
using a Degaussing Coil.
picture.
Then press the number 5 button on the remote
control unit.
screen; if adjustment is necessary follow step 4.
6.5H(412.7µs) is preferable.
trol unit if necessary. The value will be changed in
0.5H steps up or down. Adjustable range is up to
9.5H. If the value is beyond adjustable range, the
display will change as:
Lower out of range: 0.0H
Upper out of range: -.-H
Mode Input
--- Monoscope
Spec.
See below.
T7300EA