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Page Title:
Table 4-2. Checkout/Troubleshoot the Receiver-Transmitter RT-1277/URC-92 (cont) |
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|  TM 11-5820-873-34
Table 4-2.
Checkout/Troubleshoot the Receiver-Transmitter RT-1277/URC-92--Continued
STEP
ACTION
INDICATION
NEXT STEP
26
Connect multimeter between 1A1S16-7 and ground.
Multimeter indicates + 12 VDC 0.8 VDC.
Yes: replace 1A1S16
No: step 285
27
Set mode switch to OFF. Remove 1A6A1 from 1A6XA1.
Continuity checks good.
Yes: step 28
Check continuity between 1A6XA1 pins C and 3.
No: replace transformer
1A6T1.
28
Continuity check 1A6TB1 pins E1 to E3, and pins E5 to E6.
Continuity checks good.
Yes: step 285
No: replace transformer
1A6T1.
29
Connect multimeter between 1A6XA1-15 and ground.
Multimeter indicates + 5 VDC 0.25 VDC.
Yes: step 31
No: step 32
30
Connect multimeter between 1A1S16-3 and ground.
Multimeter indicates + 5 VDC 0.25 VDC.
Yes: step 31
No: step 36
31
Connect multimeter between 1A1DS3 center contact and
Multimeter indicates + 5 VDC 0.25 VDC.
Yes: replace 1A1DS3
ground.
No: step 285
32
Connect multimeter between 1A6XA1-P and ground.
Multimeter indicates + 12 VDC 0.8 VDC.
Yes: step 33
No: step 35
Yes: step 34
33
Check transistor 1A6Q103.
Transistor 1A6Q103 checks good.
No: replace transistor
1A6Q103
34
Check fuse 1A6A1F3.
Fuse checks good.
Yes: step 286
No: replace fuse 1A6A1F3
35
Set mode switch to OFF. Remove 1A6XA1 from 1A6A1.
Continuity checks good.
Yes: step 36
Continuity checks 1A6XA11 pin P to pin 13.
No: replace transformer
1A6T1
36
Check components 1A1Q101, 1A1C5, and 1A1C7.
Components check good.
Yes: step 37
No: replace faulty com-
ponent.
37
Connect multimeter between 1A1S16-3 and ground.
Multimeter indicates + 5 VDC 0.25 VDC.
Yes: step 39
No: step 38
38
Connect multimeter between 1A6A1F3 and A6A1C9 junction
Multimeter indicates + 10 to + 22 VDC.
Yes: step 285
and ground.
No: step 286
39
Connect multimeter between 1A1A3P1-44 and ground.
Multimeter indicates + 5 VDC 0.25 VDC.
Yes: step 288
No: step 40
40
Connect multimeter between 1A1A2-1 and ground.
Multimeter indicates + 5 VDC 0.25 VDC.
Yes: step 289
No: step 41
41
Connect multimeter between 1A1S16-4 and ground.
Multimeter indicates + 5 VDC 0.25 VDC.
Yes: step 285
No: replace switch
1A1S16
42
Connect multimeter between 1A1S16-2 and ground.
Multimeter indicates + 3 VDC 0.25 VDC.
Yes: step 43
No: replace switch 1A1S16
43
Check components 1A1CRF53. lA1CR54, and 1A1CR55.
Components check good.
Yes: step 285
No: replace faulty com
ponent.
44
Connect multimeter between 1A1DS1-1 center contact and
Multimeter indicates + 12 VDC 0.8 VDC.
Yes: replace 1A1DS1
ground.
No: step 45
45
Connect multimeter between 1A1S1A, rear, pin 4 and ground.
Multimeter indicates + 12 VDC 0.8 VDC.
Yes: step 46
No: step 48
46
Connect multimeter between 1A1S2C, rear, pin 4 and ground.
Multimeter indicates + 12 VDC 0.8 VDC.
Yes: step 47
No: step 49
Yes: step 48
47
Check diode 1A1CR16.
1A1CR16 checks good.
No: replace diode
1A1CR16
Yes: step 49
48
Check switch 1A1S15.
1A1S15 checks good.
No: replace switch
1A1S15
Yes: step 52
No:
replace
faulty
49
Check switches 1A1SlA rear, 1A1S2C rear, and 1A 1S3B rear.
Components check good.
component.
50
Set FREQ CONTROL switch to B. Set FREQUENCY B
LOW FREQ LIMIT lamp illuminates sometimes.
Yes: step 52
controls to 1.5000 MHz. Rotate 100 KHz control thru positions
No: replace switch 1A1S9
4, 3, 2, 1 and 0.
51
Check the following components 1A1S7A rear, 1A1S8C rear,
Component d check good.
Yes: step 285
1A1S9B rear, 1A1S15 and 1A1CR37.
No:
replace
faulty
component.
4-6
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