TM 11-6625-2638-30
Table 2-3. Test Set Troubleshooting - Continued
STEP
PROCEDURE
NORMAL INDICATION
ABNORMAL INDICATION
CORECTIVE ACTION
23
Connect SCOPE to J5-t (-) and J5-HH (+).
NOTE
A separate power supply is needed for the following test.
q
q Be sure power supply outputs are not grounded.
24
Set power supply to 10 vdc 0.1 v and connect to test set per step 25.
25
Check peak to peak levels of square waves per following table.
10 VDC
PEAK TO PEAK
SCOPE
POWER SUPPLY
SQUARE WAVE
SUB
SCAN SW.
+
RETURN
MINIMUM
MAXIMUM
STEP
POSITION
CH-A
-
1
GND
J5-y
J5-t
J5-HH
0.0
0.5
SCAN A
24.0
J5-t
16.0
J5-HH
SCAN A 2
GND
J5-y
2
12.5
J5-HH
8.0
J5-t
3
J5-y
SCAN B
GND
22.0
J5-t
18.0
J5-HH
4
SCAN B 2
GND
J5-y
22.0
GND
J5-y
J5-t
J5-HH
18.0
5
SCAN B 4
J5-t
16.0
24.0
J5-HH
GND
6
SCAN A 1
J5-y
24.0
J5-t
16.0
7
GND
J5-HH
SCAN A 3
J5-y
22.0
18.0
J5-t
8
GND
J5-HH
SCAN B 1
J5-y
J5-t
18.0
22.0
GND
J5-HH
9
SCAN B 3
J5-y
22.0
J5-t
18.0
J5-HH
10
SCAN B 5
J5-y
GND
Per table
High or low
Replace circuit board (para 2-16).
26
Disconnect power supply from test set.
27
Place POWER switch to OFF.
AC and DC POWER lamps off.
28
Set MODE switch to SCAN A.
2-11
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