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6-7 R.G.B. Video Amplifier Abnormal
6-8 Blank EEPROM Trouble-shooting:
Description of functions for models under C1996 series EEPROM DATA AUTO-RELOAD
The function allows plant staff to pre-write and customer service personnel to use blank EE PR OM
through the pre-write EEPROM function whenever the CPU is im plemented. T he method of operation
is as follows:
First, press the H OT KE Y, start af ter C1996 turns to (<&>) KEY . At this point of time, the CPU
is capable of detecting the f irst 8 D ATA of each page that E E P R OM contains. When the
reading goes to 00H or FFH , the E E PR OM PAGE w ill turn to blank; instead, the pre-set value
is being w ritten into the E E PR OM through CP U . Otherw ise, it shall be deem ed an eff ective
value and that the pre-write function shall not be activated.
R G B V ideo AM P Abnormal
Check
waveform at I501 pin 18, 19
and 20
Yes
Check
I901 pin 1, 3 and 2 voltage
and wave form
Yes
V ideo signal present at the
pin of the CRT R.G.B.
Cathode
Yes
Defective cut-off circuit
(DC restore)
Check or replace the
N o
signal cable or I501
N o
Replace I901
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