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A
Measure
The\_
Inguard
Power
Supplies
16
Labeled
Test
Points
On
The
A10
Assembly).
Are
The
Voltages
Within
±
6%
Of The
Marked
Values
Also
Measure
±
1
0
V
Reference
Supplies.
.
\
Connect The
Oscilloscope
ToA10U26.Rn
27.
Troubleshoot
The
Ingusrd
Power
Supplies.
1s
The
Clock
Signal
(Waveform
2)
\
Present?
/
NO
Troubleshoot
Clock
Cir*
^
cult
(A10U21,
A10U23.
"
A10U28 And
Associated
Components).
Measure
^
The
Bies
Voltage
On
Pin
38
Of
A10U26.
Is
This Voltage Within
t
J25
Volts
Of
The
Value
Marked
On U26
Replace
A10R105
With
The
Proper
Value.
The
Interrupt
^
Signal
At
Pin
29
Of
A10U26
Held
High
or
Toggling
^
Troubleshoot
The
Inter-
^
rupt
Circuit
(A10U9,
19.
21. 24,
21
28.
32
And
Associated
Components).
/A10R105
The\
Proper Value
For
The
Voltage
Marked
On A10U267
•
2X1
V-
737 kn
-23V-6.04kn
•
3.0
V
- 4.75
kn
-3.5
V -392 kn
-4,0
V
-3.32
kn
•4.5
V -230 kn
•
50 V
- 2.37
kn
.
Are
•^The
Oats
Signals^
On
Pins
18
Through
26 Of
A10U26>4
Volts
Peek-To-Paak
\
?
/
NO
Troubleshoot
The
I/O
Cir-
-
cult
(AlOUn.
12. 13. 16.
16. 17. 22,
26,26,27 And
Associated
Components),
Waveform
2
Volts/Oiv
1.0
iM.-
Turn
Instrument
OFF
And
Carefully
Remove
A10U26.
Turn
Instrument
ON.
Time/Div
.5
usee
-^he
Bias
Voltage^
On
Pin
38 Of The
ICSocket
Within
t
.3 volts
Of The
Value
Marked
On
U26?
U26 May
Have
Aged
And
Replaced
Replace
A10U26.
3455-B-
1
Figure 8-H-18.
Inguard Troubleshooting Procedure
Diagram,
Power
Supply and
Controller
Circuitry.
8-113/8-114
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