Chapter 4. GENERAL SUPPORT

TM 11-5820-873-34

CHAPTER 4

GENERAL SUPPORT

Section I. GENERAL

checkout/troubleshoot and an antenna coupler CU-

4-1. Scope

2229/URC-92 checkout/troubleshoot.

This chapter contains checkout, troubleshooting, repair,

4-2. Voltage Measurements

removal, replacement and other maintenance required

for general support of Radio Set AN/URC-92. The

Applicable voltages and acceptable tolerances are listed

checkout and troubleshooting procedures are separated

in Table 4-1.

into

receiver-transmitter

RT-1277/URC-92

Section II. TOOLS AND EQUIPMENT

VDC 0.25

28 VDC 1.5

4-3. Test Equipment

VDC 0.25

7.7

VDC 0.8

Refer to TM 11-5820-873-12 Appendix D, TM-11-5820-

VDC 0 8

12 VAC 0 8

873-20P and TM 11-5820-873-34P. Also, a BNC to clip

9.56

VDC 0.8

20 VAC 1.5

lead cable is required (Fig 4-1).

VDC 0.8

115 VAC 15

Table 4-1 Voltage Measurements

VDC 0.2

12 VDC 0.8

VDC 0.5

22 VDC 1.5

EL5EB052

Figure 4-1. BNC/Clip Lead Cable

Section III. CHECKOUT/TROUBLESHOOT

portion (steps 1 thru 16) indicates the receiver-

4-4. General

transmitter

operationally

ready

for

use

Troubleshooting procedures are designed to function

This section contains checkout and troubleshooting for

from incorrect indications in the checkout Following any

both the receiver-transmitter and the antenna coupler.

repair action, the test technician must return to step 1 of

Completion of a checkout signifies a particular unit is

the checkout unless directed differently by the

operationally ready for use. Troubleshooting procedures

procedure The troubleshooting does not consider

are designed to function from incorrect indications in the

incorrect or missing supply voltages to subassemblies

checkout.

Before any replace/repair action is accomplished on a

subassembly, the test technician should verify all

4-5.

Receiver-Transmitter

RT-1277/-URC-92

necessary supply voltages at the subassembly.

Checkout/Troubleshoot.

Incorrect or missing supply voltages should be repaired

using conventional troubleshooting methods. Refer to

The following procedures in Table 4-2 will establish the

the List of Illustrations for the appropriate schematics

operational readiness of RT-1277/URC-92 receiver-

transmitter Successful completion of the checkout

4-1