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MAINTENANCE
Table 7-13. Input Amplifier
Checks
steu I Item/ComPonent
1 Reauired
Condition
1 Remarks
1
Power
2
CPLG Key
3
Range
4
VOLTAGE INPUT jack
5
U387, pin 6
6
U386, pin 6
7
VOLTAGE INPUT jack
8
U387, pin 6
Y
U386, pin 6
'IO
Range
11
VOLTAGE INPUT jack
12
U387, pin 6
13
U386, pin 6
14
VOLTAGE INPUT jack
15
U387. Din 6
16
U386, bin 6
17
Range
18
VOLTAGE INPUT jack
19
U387, pin 6
20
U386, bin 6
21
VOLTAGE INPUT jack
22
U387, pin 6
23
U386, pin 6
24
Range
25*
VOLTAGE INPUT jack
26*
U387, pin 6
27*
U386, pin 6
28
VOLTAGE INPUT jack
29
U387, pin 6
30
U386, pin 6
Turn power on.
Select DC coupling
Select 320mV range
Apply
+32O.OOmV
+488.321x&', ?O.l%
+4.8832v, *0.7%
Apply
-32O.OOmV
-488.321x&', +O.l%
-4.8832mV,
-tO.l%
Select 3.2V range.
Apply
+3.2OOOV
+4.8832\/, ?O.l%
+4.8832V, +O.l%
Apply
-3.2OOOV
-4.8832V, *O.l%
-4.8832V, +O.l%
Select 32v range.
Apply
+32.OOOV
+4.8832V, 10.1%
+4.8832V, +O.l%
Apply
-32.OOOV
-4.8832V, +O.l%
-4.8832V, iO.l%
Select 2oov range.
Apply
t200.00V
+3.052V, +O.l%
+3.052V, +O.l%
Apply
-2OO.OOV
-3.052V, +O.l%
-3.052V, tO.l%
All voltages referenced to signal
common (outer shell of
VOLTAGE INPUT jack).
Use DC coupling
for all
measurements.
Use accurate calibration
soutw.
Output
of fixed gain amp.
Output
of Xl/Xl0
amp.
Calibration
source.
Fixed gain amp.
Xl/Xl0
amp
Use DC calibrator.
USC DC calibrator.
Use DC calibrator.
Use DC calibrator.
Use DC calibrator.
Use DC calibrator.
*WARNING:
Hazardous
voltage used in these steps.
Table 7-14. Input Amplifier
Gain Values
7-34
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