Panasonic OmniVision PV-M1326, Service Manual, Page: 36 / 173

2-33
50V
5ms
TP50
DC GND
A
45
2. FOCUS, SCREEN, CUT OFF, DRIVE
ADJUSTMENT
Purpose:
To set the optimum Focus and Screen.
Symptom of Misadjustment:
The picture is out of Focus and there will be an improper
screen color mix.
TP ADJ. MODE INPUT
TP50 FOCUS CONTROL STOP (VIDEO IN)
SCREEN CONTROL MONOSCOPE
R363, R365, R369 PATTERN
R370, R371, R5907 SIGNAL
TAPE M.EQ. SPEC.
OSCILLOSCOPE Refer to Descriptions
NTSC VIDEO PATTERN below
GENERATOR
Note:
Focus Control, Screen Control : Flyback Transformer
TP50, R363, R365, R369, R370, R371 : CRT C.B.A.
R5907 : TV Y/C Process Section on the VCR Main
C.B.A.
(SETUP)
1. Controls
R363, R365,
(B-, R-DRIVE VR) : Counterclockwise 45 degrees
from center on Component
Side, refer to Fig. E7-1.
R369, R370, R371
(B-,G-,R- CUT OFF VR) : Center
Fig. E7-1
1. Adjust the Focus Control on Flyback Transformer to
Sharpest Picture position.
2. Turn the Screen Control on Flyback Transformer fully
counterclockwise.
3. Set the Service Switch on the TV Y/C Process Section
of the VCR Main C.B.A. to Service Position.
4. Adjust R5907 (SUB BRIGHTNESS) so that the level A
becomes as follows;
A=150
±
5VDC (Model : A,B,C,D,E,F,G)
A=170
±
5VDC (Model : H,I,J,K)
A=195
±
5VDC (Model : L)
Fig. 7-2
5. Turn the Screen Control on Flyback Transformer
clockwise carefully and stop at the point where any
color is first observed.
6. Adjust R369 ((B-CUT OFF), R370 (G-CUT OFF) or
R371 (R-CUT OFF)) VR of colors which are not
observed in step 5 so that the Horizontal line is white.
7. Set the Service Switch to the Normal Position.
8. Adjust R5907(SUB BRIGHTNESS) so that the picture
has adequate brightness.
9. Adjust R365(R-DRIVE) and R363(B-DRIVE) so that the
whole screen is white.
3. TINT ADJUSTMENT
Purpose :
To set the standard color phase.
Symptom of Misadjustment :
Color phase will be shifted.
(SETUP)
Reset the control levels to the factory -set levels using
the remote control.
TP ADJ. MODE INPUT
TP48 R5927 STOP (VIDEO IN)
RAINBOW COLOR
BAR
TAPE M.EQ. SPEC.
OSCILLOSCOPE A : B = 2 : 1
NTSC VIDEO
PATTERN
GENERATOR
Note:
TP48 : CRT C.B.A.
R5927 : TV Y/C Process Section on the VCR Main
C.B.A.
Turn R5927 (SUB TINT) on the TV Y/C Process Section of
the VCR Main C.B.A. so that the waveform becomes
A : B = 2 : 1.