Al2
Digital Control Signals Check
Several digital control signals must be functional for the
Al2
assembly
to operate properly. Check the control lines listed in
‘I%ble
7-4
with the
oscilloscope in the high input impedance setting.
‘Ihble
7-4.
Ala-Related
Digital Control Signals
Mnemonic
LENREF
LHB
LLB
Signtll
Description
L-Reference Enable
L-Hi&
Band
L-Low Band
Loc8tion
Al2P2-6
Al2P2-32
Al2Pl-23
see
Analyzer
FIBrve
-ttinB
Figure
7-15 Preset
Figlm
7-16
Preset
Finure
7-16
Preset
L
ENREF Line. This is a
TI’L
signal.
lb
observe it, trigger on the negative edge.
In preset state, the signal should show activity similar to Figure 7-15.
ch.2
-
Fg>z;d’v
offwt
Tim,bwm
-
.
sg617ssg617s
Figure 7-15. L ENREF Line at
A12P2-16
(Preset)Figure 7-15. L ENREF Line at
A12P2-16
(Preset)
Source Troubleshooting
7-23
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