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FROM
PREVIOUS PAGE
STEP
SUS ANALYZER
TWICE.
CHECK
THAT
ANALYZER
INDICATES
F5
AND
THAT
THE LOGIC LEVELS
AT
1C
1
2-29 TO 36
ARE
11110101
(0
=
LOW)
MONITOR
IC12-40
WITH OSCILLOSCOPE
PRESS
ANO HOLD
STEP KEY
ON
BUS
ANALYZER
FAULT
ON
ATN
LINE
TRACE
LINE
FROM
SK3
PIN
1
1
TO
ICt
2-26
FAULT
ON
DATA
LINES
BETWEEN
SK3
AND
ICT
CHECK THAT
AODR
INDICATOR LIGHTS
AND
OSCILLOSCOPE
DISPLAYS
WAVEFORM
SHOWN
RELEASE BUS
ANALYZER
FROM
SINGLE
STEP.
ALLOW
CONTROLLER
TO
RUN PROGRAM.
CHECK THAT
CONTROLLER
DISPLAYS
FA
+
00
1
0
OOOOOOO
€ +
06
INSTRUMENT NOT
ENTERING
ADDRESSED-
TO-TALK state.
ABORT
PROGRAM
ANO
DISPLAY GPI8
ADDRESS
(SEE
SUBSECTION
2.8.3)
HANDSHAKE
FAULT
REFER TO WRITING
TO THE
BUS
IN
SECTION
5
X
CHECK
ADDRESS
SWITCHES
ANO
LEVELS AT
IC9-31
TO
34
OR
SUSPECT FAULT
IN
1C
1
2
OR
tC9
GO
TO
NEXT PAGE
Figure
6.2
-
Fault Finding
Flowchart
-
GPD3
Part 2
6-17
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