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Service Mode Adjustments
Following adjustments should be carried out when the memory IC is replaced. How to enter the service mode and
adjust values, please refer to " Entering to Service mode" on page 8.
Item 126 [RF DELAY ADJ] AGC ADJ
NOTE: Do not attempt this adjustment with weak signal.
(1) Tune the receiver to most clearest (or strongest) VHF
station in your area. Set the brightness and contrast
controls to maximum. Set the colour control to
minimum.
(2) Select [RF DELAY ADJ] in the service mode.
(3) Change value until the snow noise just disappears.
(4) Exit from service mode.
Item 18 [AFC2 H-PHASE 50] HORIZONTAL ADJ
(1) Receive a monochrome circular pattern.
(2) Set the brightness and contrast to normal.
(3) Select [AFC2 H-PHASE 50] in the service mode.
(4) Change value to be optimum horizontal centre position.
(5) Exit from service mode.
Item 16 [V-SHIFT 50] VERTICAL CENTRE
(1) Receive a monochrome circular pattern.
(2) Set the brightness and contrast to normal.
(3) Select [V-SHIFT 50] in the service mode.
(4) Change value to be optimum verticall centre position.
(5) Exit from service mode.
Horizontal centre
Vertical centre
-16-
Item 6 [V-SIZE 50] VERTICAL SIZE
(1) Receive a monochrome circular pattern..
(2) Set the brightness and contrast to maximum.
(3) Select [V-SIZE 50] in the service mode.
(4) Change value to be optimum vertical size.
(5) Exit from service mode.
Item 14 [V-LINEARITY 50] VERTICAL LINEARITY
(1) Receive a crosshatch pattern.
(2) Select a picture mode of NATURAL by pressing the
PICTURE MODE button.
(3) Select [V-LINEARITY 50] in the service mode.
(4) Adjust Vertical Linearity so that the difference of "a" and
"b" becomes less than 3mm by pressing VOLUME + or
- button.
(5) Exit from service mode.
a
b
Item 12 [V S CORRECT 50] V-S CORRECTION
(1) Receive a crosshatch pattern.
(2) Select a picture mode of NATURAL by pressing the
PICTURE MODE button.
(3) Select [V S CORRECT 50] in the service mode.
(4) Adjust Vertical S-letter Correction so that the difference
of "c", "d" and "e" becomes less than 2 mm by pressing
the VOLUME + or - button.
(5) Confirm Vertical Linearity and adjust Vertical Center
then Vertical Size.
(6) Exit from service mode.
c
d
e
Vertical size
Upper
Center
Bottom
Upper
Center
Bottom
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