7.3.9. SUB CONTRAST ADJUSTMENT
Purpose:
To set the optimum sub contrast level.
Symptom of
Misadjustment:
The picture is too dark or too light.
Test Point:
Pin 5 of P6001 (TV/VCR Main C.B.A.)
or TP49 (CRT C.B.A.)
Adjustment:
SUB CONTRAST (EVR)
Specification:
3.0 V[p-p]±0.1 V[p-p]
Input:
Video Input Jack, Crosshatch Pattern
Signal 1 V[p-p] (75
Ω
terminated)
Mode:
STOP
Equipment:
Oscilloscope, NTSC Video Pattern
Generator
1. Supply a Crosshatch Pattern Signal to the Video Input Jack.
2. Connect the Oscilloscope to Pin 5 of P6001 on the TV/VCR
Main C.B.A. or TP49 on the CRT C.B.A.
3. Select SUB BRIGHT in EVR adjustment mode. Then, after
making a note of the original value, adjust to the (D0).
4. Select SUB CONTRAST in EVR adjustment mode and
adjust so that the level A is 3.0 V[p-p]±0.1 V[p-p].
5. Select SUB BRIGHT in EVR adjustment mode and reset to
the original value.
Fig. E7
7.3.10. 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.
Test Point:
TP50 (CRT C.B.A.)
Adjustment:
FOCUS CONTROL (Flyback
Transformer),
SCREEN CONTROL (Flyback
Transformer),
SUB BRIGHT (EVR),
B DRIVE (EVR),
R DRIVE (EVR),
B CUT -OFF (EVR),
G CUT -OFF (EVR),
R CUT -OFF (EVR)
Specification:
Refer to descriptions below.
Input:
Video Input Jack
Monoscope Pattern Signal
Mode:
STOP
Equipment:
Oscilloscope, NTSC Video Pattern
Generator
1. Supply a Monoscope Pattern Signal to the Video Input
Jack.
2. Connect the Oscilloscope to TP50 on the CRT C.B.A.
(Use TP47 for GND.)
3. Select SUB BRIGHT and move the shaded area to the
value in EVR adjustment mode.
4. Adjust the FOCUS CONTROL on the Flyback Transformer
so that the center of picture is the sharpest.
5. Turn the SCREEN CONTROL on the Flyback Transformer
fully counterclockwise.
6. Press DISPLAY key (Service Switch) on the remote control
for collapse scan. (Refer to HOW TO ENTER SERVICE
MODE.)
7. Adjust SUB BRIGHT in EVR adjustment mode so that the
level A is (140 VDC±5 VDC: Model: A, B, C, D, E, F, G) or
(170 VDC±5 VDC Model: H, I, J, K, L).
51
PVQ-1310 / PV-C1320 / PV-C1330W / VV-1300 / VV-1310W / PV-C1340 / PV-C1350W / PV-C2010 / PV-C2020 / PV-C2030W / VV-2000 / PV-C2060
