Sharp 37GQ-20FP, Service Manual

4

37GQ-20FP

SERVICE ADJUSTMENT

•

SERVICE MODE FUNCTION

This mode funtion is provided to assist with the settings of those adjustments that may vary from one
Picture Tube to another, or between models.

In order to use the Service Mode

1. Press main switch to OFF.
2. Connect Test Pattern signal to antenna terminal.

3. Press 

∨

, CH 

∨

 and main switch to ON simultaneosly or

    press 

∧

, CH 

∧ 

and main switch to ON simultaneosly.

4. -SERVICE- will appear on screen. Service mode is now entered.

5. Select adjustment using buttons 

∧ 

CH 

∧

.

   To exit Service Mode, press main switch to OFF or press MENU button on R/C.

a.
b.
c.
d.
e.

f.

g.
h.
i.
j.
k.
l.
m.
n.

SERVICE
NVM
AGC GAIN
AGC STR
PLL
PAL

AUTO

B-GAIN
G-GAIN
G-DC
R-GAIN
R-DC
HOR POS
VERT POS
VERT AM

Displayed
on screen

Hexadecimal /

Decim. Range

Function

00 

∼

 03H

00 

∼

 63H

S, L, VL, N
4-43, 3-58,

SECAM, NTSC

4-43,NTSC 3-58,

AUTO PNS,

AUTO PN

AUTO, 50HZ,

60HZ

0 

∼

 63d

0 

∼

 63d

0 

∼

 63d

0 

∼

 63d

0 

∼

 63d

0 

∼

 63d

0 

∼

 63d

0 

∼

 15d

Indicates operative Service Mode.
Access to NVM memory
Auto Gain Control
Auto Gain Starting Point
Line PLL time constant
Colour system.

Field Frequency

Blue Gain
Green Gain
Green Cut
Red Gain
Red Cut
Horizontal Position shift
Vertical Position shift
Vertical Amplitude shift

6. For « a » Selection:
NVM storage location settings variants.

BANK           POS

VALUE

    X

XXH

   XXH

      Assigned value

Storage location

Memory Bank

In order to have access to NVM  «MENU» button should be pressed. To obtain a higher or lower Memory

Bank, buttons  

∨

∧ 

should be pressed respectively. To have access to the desired Storage Location,

buttons 

∨

 CH  

∧ 

should be pressed, as required to obtain a higher or lower location, respectively.