BLANK
CHECK POWER SUPPLIES,
NOTE DISPLAY
DISPLAY POWER SUPPLY, AND
DISPLAY DECODE LOGIC.
TURN UNIT ON
IS FAN RUNNING?
INVALID
CHARACTERS
-
SEE FIGURE 612.
UNlT FAILED RAM CHECK.
THE SYSTEM RAM OR
THE RAM DECODING CHIPS ON
A105 ARE BAD.
NO
--
1 1 1
31-31 UNIT FAILED PROM CHECK.
REFER TO ERROR MESSAGE
TABLE FOR BAD PROM OR PROM
CHECK FUSE, AC POWER, AND
ONlOFF SWITCH
Ill I
DECODING.
I
ZEROS
I
I
I
(
lM'ss'Nq
DISPLAY DlGlT DRIVER
CIRCUITRY BAD. USE TESTS 02
I
I
1
AND 04 TO TROUBLESHOOT.
I
p:TS
I
DISPLAY SEGMENT DRIVER
CIRCUITRY
BAD.
USE
TESTS
02
AND 03 TO TROUBLESHOOT.
1
DIGIT
LIT VERY
BRIGHTLY
DISPLAY MUX
DRIVER BAD
PRESS: BAND, 1
DOES UNlT RESPOND TO
KEYBOARD7
PROGRAM
INOPERATIVE
SEE FIGURE 6-13.
KEYBOARD
CHECK BAND
1
OPERATION.
DOES BAND
1
OPERATE
PROPERLY7
,
IyEs
kIsEE
FIGURE 6-14.
BAND
1
PRESS: TEST, 0,
1
DOES TEST 01 COUNT 200 MHz7
200 MHz TEST
CHECK BAND 2 OPERATION.
DOES BAND 2 OPERATE
PROPERLY7
SEE FIGURE 6-16.
BAND 2
CHECK BAND 3 OPERATION.
DOES BAND 3 OPERATE
PROPERLY
7
,
ly
Es
kIsEE
FIGURE 6-17.
BAND 3
UNlT OK
Figure
6-1
1.
Main Troubleshooting Tree
Scans by ArtekMedia © 2007
To Next Page
Loading...