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