Sanyo C20LB88B, Service Manual

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Service Adjustments
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 mini-
mum.
(2) Select Item No. 01 [RFAGC] in the service mode.
(3) Change value until the snow noise just disappears.
(4) Exit from the service mode.
(1) Receive a monochrome circular pattern.
(2) Set the brightness and contrast to normal.
(3) Select Item No. 02 [H-PHA] in the service mode.
(4) Change value to be optimum horizontal centre position.
(5) Exit from the service mode.
(1) Receive a monochrome circular pattern.
(2) Set the brightness and contrast to maximum.
(3) Select Item No. 03 [V-POS] in the service mode.
(4) Change value to be optimum vertical centre position.
(5) Exit from the service mode.
(1) Receive a monochrome circular pattern.
(2) Set the brightness and contrast to maximum.
(3) Select Item No. 04 [V-SIZ] in the service mode.
(4) Change value to be optimum vertical size.
(5) Exit from the service mode.
(1) Receive a monochrome circular pattern.
(2) Set the brightness and contrast to normal.
(3) Select Item No. 12 [OSDHP] in the service mode.
(4) Change value to be proper OSD position.
(5) Exit from the service mode.
(1) Switch on the TV.
(2) Select Item No. 65 [AFCRF] in service mode.
(3) Change data value to “01”.
(4) Exit from the service mode.
(1) Tune receiver to a caption channel.
(2) Check that CAPTION position is in the horizontal
center of the screen. If CAPTION center is too right or
left, perform steps 3-6. (See figure below.)
(3) Select Item No. 85 [CCD] in the service mode.
(4) Adjust data with + or - key for proper horizontal center.
(5) Exit from the service mode
±
Item 85 [CCD] CAPTION H-POSITION ADJ.
±
Item 65 [AFCRF] AFC GAIN
Item 12 [OSDHP] OSD POSITION
Item 04 [V-SIZ] VERTICAL SIZE
Item 03 [V-POS] VERTICAL CENTRE
Item 02 [H-PHA] HORIZONTAL CENTRE
Item 01 [RFAGC] AGC
Horizontal centre
Vertical centre
Vertical size
XXX XXXX XXXX XXX
A B
Caption H-position Adj.
A=B