Sanyo CP21VF1, Service Manual

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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.

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 105 [RF DELAY ADJ] AGC 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 18 [AFC2 H-PHASE 50] HORIZONTAL ADJ

(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 6 [V-SIZE 50] VERTICAL SIZE 

Horizontal centre

Vertical size

c

Upper

Center

Bottom

d

e

a

b

Upper

Center

Bottom

(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 or - button.

(5) Confirm Vertical Linearity and adjust Vertical Center 

then Vertical Size.

(6) Exit from service mode.

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-LINEARITY 50] in the service mode.
(4) Adjust Vertical Linearity so that the difference of “a” and

“b” becomes less than 3mm by pressing or
- button.

(5) Exit from service mode.

Item 14 [V-LINEARITY 50] VERTICAL LINEARITY

(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.

Item 16 [V-SHIFT 50] VERTICAL CENTRE

Vertical centre

SM_21-BD6V(AC7-A)Aus  11/8/07  1:14 PM  Page 15