Service Adjustment - Sharp 37GQ-20S Service Manual

37GQ-20S
37GQ-21S

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
∧
press , CH
4. -SERVICE- will appear on screen. Service mode is now entered.
5. Select adjustment using buttons
To exit Service Mode, press main switch to OFF or press MENU button on R/C.
Displayed
on screen
SERVICE
NVM
a.
AGC GAIN
b.
AGC STR
c.
PLL
d.
PAL
e.
AUTO
f.
B-GAIN
g.
G-GAIN
h.
G-DC
i.
R-GAIN
j.
R-DC
k.
HOR POS
l.
VERT POS
m.
VERT AM
n.
6. For « a » Selection:
NVM storage location settings variants.
In order to have access to NVM «MENU» button should be pressed. To obtain a higher or lower Memory
∨
Bank, buttons
∨ ∧
buttons CH should be pressed, as required to obtain a higher or lower location, respectively.
∨
and main switch to ON simultaneosly or
∧
and main switch to ON simultaneosly.
∧ ∧
.
CH
Hexadecimal /
Decim. Range
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
BANK POS
X XXH
∧
should be pressed respectively. To have access to the desired Storage Location,
Function
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
VALUE
XXH Assigned value
Storage location
Memory Bank
4