![background image](http://html.mh-extra.com/html/haier/ht-3768/ht-3768_service-manual_138130020.webp)
and filtered via VD515 and C542 to 25V direct current voltage to supply
the vertical scan IC. The pulse voltage output from (14) is rectified and filtered via
VD513 and C532 to 15V direct current voltage. +12V direct current
voltage output from N506 (3), after rectification of the secondary source, +9V and
+5v are supplied to the decoder chip. And CPU. The voltage of VT comes from
the main voltage.
B. Service mode and adjusting items and data
1.Factory adjustment information
Operation method: after the appliance is switched on, make the volume value to
zero. Then press “ ” key on the TV set and press the DISP button on remote
controller at the same time to enter the S state. Press DISP button one times and
“S” will disappear, Repeat the first step, you will enter the D mode. Now one “D”
is displayed on the TV screen.
Press PRO- and PRO+ buttons to select items for adjustment.
Press VOL- and VOL+ buttons to adjust selected items.
Press the POWER button to switch off the appliance and go back to the normal
state.
Maintenance menu (Table 8)
Item Specifications
Default
Value
Variable
Mark
RCUT
RED CUT OFF BALANCE
20
*
GCUT
GREEN CUT OFF BALANCE
20
*
BCUT
BLUE CUT OFF BALANCE
20
*
GDRV
GREEN DRIVE BALANCE
40
*
BDRV
BLUE DRIVE BALANCE
40
*
CNTX
CONTRAST MAX VALUE
3F
BRTC BRIGHTNESS
48
COLC
NTSC COLOUR CENTER VALUE
40
TNTC
TINT CENTER VALUE
40
COLP
PAL COLOUR CENTER VALUE
20
COLS
SECAM COLOUR CENTER VALUE
40
SCNT SUB
CONTRAST
0B
CNTC
SUB CONTRAST CENTER VALUE
30
CNTN
SUB CONTRAST MIN VALUE
00
BRTX
SUB BRIGHTNESS MAX VALUE
30
BRTN
SUB BRIGHTNESS MIN VALUE
30
COLX
SUB COLOUR MAX VALUE
35
COLN
SUB COLOUR MIN VALUE
00
TNTX
SUB TINT MAX VALUE
28
TNTN
SUB TINT MIN VALUE
28
20
Summary of Contents for HT-3768
Page 36: ......
Page 37: ...B Circuit Diagrams 1 ...
Page 38: ...Sincere Forever Haier Group Tel 86 532 8938356 Web site http www haier com ...