Tovis MTG-2902SN/SE, Service And Operation Manual

Page: 7 / 11

7
Factory control(On Screen Display)
C. Color Adjustment
All adjustment method is same with user’s control
mode except “COLOR”.
1) Before adjust “COLOR”, “CONTRAST” and
“BRIGHTNESS” have to fix maximum.
(It’s a TOVIS’s reference condition.)
2) At the factory mode, search “COLOR” using
“UP/DOWN” key.
3) Select “COLOR” by pressing “SEL” key then color
sub-menu comes out as top below figure.
4) Search a color temperature which you want to
adjust (gain or bias) using “UP/DOWN” key.
(“GAIN” means high-beam area’s adjustment and
“BIAS” means low-beam area’s adjustment.)
5) Select an any item as wanting by pressing “SEL”
key then the OSD changes to under sub-menu as
below figure.
6) Adjust color temperature using “UP/DOWN” and
“SEL” key.
(“UP/DOWN” key: change value, “SEL” key: moves
item position.)
7) At the “GAIN” mode, “CO” means sub-contrast
adjustment.
Sub-contrast adjusted using “UP/DOWN” key if
necessary. (To meet the white peak “ft” level.)
8) Press “MODE” key to finish the “GAIN” or “BIAS”
adjustment.
9) If you want to adjust other “GAIN” or “BIAS”,
Repeat from item C. “Color Adjustment”.
10) Press “MODE” key again to finish the “COLOR”
Adjustment.
11) If you want to finish factory adjustment, Select
“RECALL” as item B. “Exit and save”
COLOR sub-menu
GAIN under sub-menu
BIAS under sub-menu
HIGH VOLTAGE SHUT-DOWN CIRCUIT
The chassis of this monitor has been designed to emit
a minimum of soft X-radiation, in accordance with US
DHHS rules 21 CFR, subchapter. A high voltage shut-
down circuit, as shown below, guarantees horizontal
oscillation shut-down should the high voltage exceed
designed picture tube maximums.
DO NOT ATTEMPT TO MODIFY THIS CIRCUIT.
A fly back pulse is generated at pin (3) of the fly back
transformer.
After the pulse converted to DC through rectifying
circuit D415 & C452, it is input to IC403 pin (16)
through the divider network register R426 & R425.
Normally cathode voltage of ZD401 is below 14V, it is
not operated but in case of excess voltage it has to
be shut-down.
IC403 FBT
R424 C414 ZD401 R425 R426 C452 D415 R4001
Pin 16 Pin 3
RG 50 BG 50
GG 50
9300 GAIN 9300 BIAS
6500 GAIN 6500 BIAS
RB 50 BB 50
GB 50