Nokia 447ZiPlus Service Manual page 16

17” colour monitor
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The table below describes the relationship between CS logic and horizontal frequency.
hf
<33khz
Cs0
L
(Linearity S
correction)
Cs1
L
(Linearity S
correction)
Cs2
L
(Linearity S
correction)
Cs3
H
(Linearity C
correction)
There is a low power override pin on pin30 of I501 this pin is pulled-up to 12V by R984, R986 on drive board
PWB-0170 and connected to pin5 of the signal cable. When the signal cable is disconnected from the
computer, this pin is high and the Self-test pattern will work as described below
When you disconnect the signal cable from the PC, and power on the monitor, the display will produce a
moving square self-test pattern. The self-test function is useful to confirm the monitor is working correctly.
When the signal cable is connected to the unpowered computer, this pin is low and the power saving circuit
will be operated, the CPU will generate a power saving signal on pin29 & pin31 of I501
The monitor is design to have the DDC 1/2b functions, communication between |the monitor and computer
for DDC is via pins24, 25 of I501 which are defined as SDA, SCL signals. The computer will read out the
EDID data from the EEPROM I502 via I
factory during production.
The memory size for EDID data is 128 bytes shared from EEPROM I502 which has 8K bytes memory size.
6-5. How to enter into the factory setting:
The monitor includes 10 sets of factory preset timings although only some of the timings are fine-tuned by
auto alignment during production.
Switch off the monitor, push and hold down the "select" key and power on again, wait 1.0 second then
release the "select" key, the monitor should now be in the factory setting mode. (OSD in blue background) ,
All adjustment data will be stored automatically , then power on again , the monitor will revert to normal
operating state.
34 to 39 khz
40 to 44 khz
H
L
H
L
L
H
H
L
2
C data lines. The EDID data is written into the EEPROM in the
14
45 to 51khz
52 to 61 khz
H
L
L
H
H
H
L
L
Hf > 62 khz
H
H
H
L

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