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f. Press the following keys on the oscilloscope:
@EAR
DwLAYJ
off
frame
axes
grid
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . highlight
grid
connect
duts
off
on
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . highlight on
m
aouxce
1
2 3 4
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . highlight
4
level
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2v
(Yiiqx5q
TIME&BE
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
..50ms/div
(CHAN)
GHANNEL
1
2 3 4 off on
highlight
CHAHNEL
1
on
set
V/div
to 0.2 V and offset to 0.6 V (1O:l probe used)
highlight CHANNEL 4 on
set
V/div
to 2 V and offset to 0 V
(F&
DISPLAY
norm
avg
env
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . highlight
noxnr
g. Using a
1O:l
probe connected to channel 1 of the oscilloscope, check for activity at pins
10 and 13 of A3U617.
h. If either pin (or both) show no activity, check for activity at pin 21 (LTIMER) of
A3U617.
i. If LTIMER is not active, troubleshoot the Interface Strobe Select circuitry (block K).
j. If there was activity at pins 10 and 13 of A3U617, suspect A3U616.
ADC/lnterface
Section 8-11