Sanyo CP21SE1 Service Manual page 14

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 9.
Item 01 [RF AGC] AGC
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 AGC] in the service mode.
(3) Change value until the snow noise just disappears.
(4) Exit from service mode.
Item 02 [H-PHA] HORIZONTAL CENTRE
(1) Receive a monochrome circular pattern.
(2) Set the brightness and contrast to normal.
(3) Select [H-PHA] in the service mode.
(4) Change value to be optimum horizontal centre position.
(5) Exit from service mode.
Item 04 [V-SHIFT] VERTICAL CENTRE
(1) Receive a monochrome circular pattern.
(2) Set the brightness and contrast to normal.
(3) Select [V-POS] in the service mode.
(4) Change value to be optimum verticall centre position.
(5) Exit from service mode.
Horizontal centre
Vertical centre
-14-
Item 05 [V-SIZ] VERTICAL SIZE
(1) Receive a monochrome circular pattern..
(2) Set the brightness and contrast to maximum.
(3) Select [V-SIZ] in the service mode.
(4) Change value to be optimum vertical size.
(5) Exit from service mode.
Item 06 [V-LIN] VERTICAL LINEARITY
(1) Receive a crosshatch pattern.
(2) Select a picture mode of NATURAL by pressing the
PICTURE MODE button.
(3) Select [V-LIN] 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 07 [V-SCO] V-S CORRECTION
(1) Receive a crosshatch pattern.
(2) Select a picture mode of NATURAL by pressing the
PICTURE MODE button.
(3) Select [V-SCO] 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