Specifications

TM 11-5820-670-30
2-26. TROUBLESHOOTING CHARTS. (CONT)
CHART 2-23
Homing Needle Indication Troubleshooting
(Sheet 1 of 3)
CONNECT EQUIPMENT AS
SHOWN IN HOMING SENSI-
TIVITY PERFORMANCE
TEST (PARA 2-19).
PERFORM HOMING ADJUST-
MENT (PARA 2-37).
PERFORM HOMING SENSI-
TIVITY PERFORMANCE
TEST (PARA 2-19).
REPLACE HOMER-DETEC-
TOR ASSEMBLY A4800
(PARA 2-40) AND ALINE
(PARA 2-37).
CONNECT OSCILLOSCOPE
AN/USM-281A TO TP4809
AND CHECK FOR 1.0 VOLTS
PEAK-TO-PEAK AT 100 Hz.
SEE ILLUSTRATION, SH 3.
CHECK DC VOLTAGE AT
TP4803. SEE ILLUSTRATION,
SH 3.
CONNECT OSCILLOSCOPE
AN/USM-281A TO TP4501
AND CHECK FOR 1.0 VOLTS
PEAK-TO-PEAK AT 100 Hz.
SEE ILLUSTRATION, SH 3.
CHECK AC SIGNAL AT
TP4801. SEE ILLUSTRATION,
SH 3.
REPLACE ASSEMBLY A4800
(PARA 2-40) AND ADJUST
(PARA 2-37).
REPLACE RF ATTENUATOR
AND DIODE SWITCH Z4501
(PARA 2-62).
2-111