JVC AV-27D502/R Service Manual page 70

SERVICE ADJUSTMENTS
These models (with A mark) were changed chassis from AV-27D502 (AC chassis).
This content describes only items which differ from those of the base models SERVICE MANUAL.
Please refer to the AV-27D502 SERVICE MANUAL (No.51797 issued Mar. 2001).
ADJUSTMENT STEP
■ ■ ■ ■ PIP VCO [ADDITION]
Measuring
Item
instrument
PIP VCO
adjustment
PIP SCREEN
■ ■ ■ ■ FOCUS [CHANGE]
Measuring
Item
instrument
FOCUS Signal
adjustment generator
■ ■ ■ ■ V POSITION & V SIZE [CHANGE]
Measuring
Item
instrument
V POSITION & Signal
V SIZE generator
adjustment
■ ■ ■ ■ SUB COLOR [CHANGE]
Model A [V
AV-27D502 +6V
/AS
AV-27D502 +7V
/AR
Test point
Adjustment part
PIP VCO transf.
(T111)
[PIP]
TU2 VCO
HIGH LEVEL
REFERENCE LEVEL
LOW LEVEL
SYNC : YES
Test point
Adjustment part
FOCUS VR
[HVT]
Test point
Adjustment part
V CENTER SW
(S421)
No.71 : V POSI
No.66 : V SIZE
No.78 : TRAPEZ
No.65 : V LIN
]
W-B
1. Set the PIP mode.
2. Receive the ordinary broadcast signal.
3. Select "TU2 VCO" of the SERVICE MENU.
4. Confirm [SYNC] to "YES".
5. Turn the PIP VCO transformer to where "REFERENCE LEVEL"
characters are yellow.
✻ When finished, confirm [SYNC] to "YES" again.
! Set the VIDEO STATUS to "STANDARD".
! When makes difference by FOCUS adjustment, should be
recommending CONVERGENCE and PURITY adjustments.
1. Receive a crosshatch signal.
2. White looking at the screen center, adjust the FOCUS VR so that
be clear and in fine detail.
3. Make sure that the picture is in focus even when the screen gets
darkness.
1. Receive a crosshatch signal.
2. Set the No.71: V POSI to "0".
3. Adjust the V CENTER SW and No.66: V SIZE to the vertical size
is 92%.
4. Confirm the vertical lines to be straight. If it is not straight, adjust
to be straight at the No.78: TRAPEZ.
5. Confirm upper and lower of the screen. If it is not symmetrical,
adjust to be symmetrical at the No.65: V LIN.
■ ■ ■ ■ SUB TINT [CHANGE]
Model
AV-27D502
/AS
AV-27D502
/AR
No. 51797B
AV-27D502
Description
Description
Description
B [V ]
W-B
+9V
+13V
3