77
Dell P1230 M25P
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Circuit Description
EEPROM as EDIDof Data Display Channel, this EEPROM is also
used to store all factory setting like H-size,H-shift,V-size,V-shift,---
- etc.
A. PURITY ANDCONVERGENCE CONTROL
There are four corner coils defined as purity coilsand installed around
theCRT, these coilsaredriven by
four DC amplifiers respectively, they providethe purity correction via
digital control, thetemperature
compensation is also available for environment andfunnel temperature
changed.
The static convergence coils (4H/4V coil) are combinedwithdeflection
yoke, theother twoDCamplifiers are used to drive the 4H/4V coil via
digital contro
l to provideend-user static convergence controlfunction.
E. MICRO-CONTROLLER
GENERAL DESCRIPTION:
The WeltrendET62P2micro-controller is used to control all required
functions ofmonitor and store all necessarydata in EEPROM
M24C16, the most important thing is that interrupt is used to detect
modechange veryfast, then request the MCU to execute protection
behavior for horizontal output transistor free
fromhigh transient pulse
during modechange.
HARDWARE DEFINITION:
a) KEY BOARD
There are five keypadsatthe front ofmonitor for the OSD control.
-OSD function key:
-Enter
Depress it to enter or exit t he OSD window
-UP
Toselect theparameters which are shownatOSD window.
- DOWN
Toselect the parameters wh
ich are shownatOSD window.
-RIGHT (+)
Toadjust the parameter to rightorupside which is chosen fromOSD
window.
- LEFT (-)
Toadjust the parameter to leftordownside which is chosen from
OSD window.
OSD windowwill disappear and save all setting after 30 seconds.
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