Size Adjustment; Shift Adjustment - Philips 14PV135 Service Manual

5. SECAM Black Level Adjustment
Purpose: To set Black Level of the SECAM signal R-
Y/B-Y to Ref. level.
Symptom of Misadjustment: If Black Level of the
SECAM signal R-Y/B-Y is incorrect, the picture is blu-
ish or reddish in grayscale compared with PAL signal.
Test
Adj. Point
point
P+/P-
J361G4
buttons
Tape M. EQ.
Pattern Generator,
--- Analog Oscilloscope (unus-
able Digital Oscilloscope)
1. Degauss the CRT and allow CRT to operate for 20
minutes before starting the alignment.
2. Input the SECAM Gray Scale signal from Ext.
input.
3. Enter the Service Mode. (See page 1-6-10.)
4. To enter the C/D/S mode, press [
remote control unit.
5. To select SBR (SECAM Black Level R-Y), press [6]
button on the remote control unit.
6. Press [P+/P-] buttons to adjust Y signal to the black
ref. level.
7. To select SBB (SECAM Black Level B-Y), press [7]
button on the remote control unit.
8. Press [P+/P-] buttons to adjust Y signal to the black
ref. level.
Y Signal
1H
Black REF. Level
1H
Mode Input
SECAM
Ext. Gray
Scale
Spec.
---
-] on the
1H
5mV/Div (10:1 Prove)
Fig. 4
1-6-13
6. V. Size Adjustment
Purpose: To obtain correct vertical height of screen
image.
Symptom of Misadjustment: If V. Size is incorrect,
vertical height of image on the screen may not be
properly displayed.
Test point Adj. Point
P+/P-
Screen
buttons
Tape M. EQ.
--- Pattern Generator
1. Enter the Service mode. (See page 1-6-10.)
Press [9] button on the remote control unit and
select V-S Mode. (Press [9] button then display will
change to V-P and V-S).
2. Input monoscope pattern and leave it for at least 20
minutes.
3. Press [P+/P-] buttons on the remote control unit so
that the monoscope pattern is 90±5% of display
size and the circle is round.
7. V. Shift Adjustment
Purpose: To obtain correct vertical position of screen
image.
Symptom of Misadjustment: If V. position is incor-
rect, vertical position of image on the screen may not
be properly displayed.
Test point Adj. Point
P+/P-
Screen
buttons
Tape M. EQ.
--- Pattern Generator
1. Enter the Service mode. (See page 1-6-10.)
Press [9] button on the remote control unit and
select V-P Mode. (Press [9] button then display will
change to V-P and V-S).
2. Input monoscope pattern and leave it for at least 20
minutes.
3. Press [P+/P-] buttons on the remote control unit so
that the top and bottom of the monoscope pattern
are equal to each other.
Mode Input
RF
Monoscope
(or Ext.)
Spec.
90±5%
Mode Input
RF
Monoscope
(or Ext.)
Spec.
90±5%
T6450EA