Tovis MTG-2907TN, Service And Operation Manual

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6
Factory control(On Screen Display)
C. Color Adjustment
All adjustment method is same with user’s control
mode except “COLOR”.
1) At the factory mode, Display VGA mode
2) Before adjust “CB”, “CONTRAST” and
“BRIGHTNESS” have to adjust 210.
(“CONTRAST” and “BRIGHTNESS” save each
mode(CGA, EGA and VGA)
3) Search “CB” using “UP/DOWN” key.
4) Select “CB” by pressing “SEL” key then color sub-
menu comes out as below figure.
5) Search gain or bias, which you want to adjust
using “UP/DOWN” key.
(“GAIN MODE” means high-beam area’s
adjustment and “BIAS MODE” means low-beam
area’s adjustment.)
6) Select an any item as wanting by pressing “SEL”
key.
7) The each “R”,”G” and “B” is selected by pressing
the “SEL” key and selected item changes OSD
color from white to it’s own color as character
8) Adjust color temperature using “UP/DOWN” and
“SEL” key.
(“UP/DOWN” key: change value, “SEL” key:
moves item position.)
9) Press “MODE” key to finish the adjustment then
main menu comes out as below figure.
10) If you want to adjust other function (sub-menu
“GAIN” or “BIAS”), Select “CB” by pressing “SEL”
key and then adjusts as same way as item 4), 5),
6) , 7) and 8).
11) If you want to adjust other mode (CGA, EGA),
Don’t adjust “CB”, Have to adjust “CONTRAST” and
“BRIGHTNESS”.
12) If you want to finish factory adjustment, Select
“RECALL” as item “B. Exit and save”
GAIN MODE BIAS MODE
(high-beam) (low-beam)
(fixed “SB”) (fixed “CB”)
OSD MODE
(Fixed)
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 12V, it is
not operated but in case of excess voltage it has to
be shut-down.
IC403 R424 C414 ZD401 R425 R426 C452 D415 FBT
Pin 16 Pin 3
GAIN MODE
SB 105
R 127
G 127
B 127
BIAS MODE
CB 032
R 127
G 127
B 127
OSD MODE
OC 105