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9. Maintenance Procedures
9.A.
In-Aircraft Adjustments
9.A.(1)
General
All alignment and adjustment procedures are accomplished during bench
maintenance. When unit performance indicates an adjustment or an alignment
is required a technician should remove the unit from the aircraft, then reference
should be made to the related Maintenance Manual.
9.A.(2)
Audio Levels
The audio inputs and outputs of the KRX 1053 are factory adjusted to the
following levels:
•
Receiver/Sidetone: 7.75 Vrms into 600 ohms at maximum volume
•
Data Input: 0.775 Vrms across 600 ohms
•
Microphone Input: 200 mVrms to 2 Vrms (typical) into 150 ohms
•
Data Output: 0.775 Vrms into 600 ohms
•
SELCAL Output: 0.775 Vrms into 600 ohms
If necessary, these levels may be adjusted for compatibility with other aircraft
systems. To access the adjustments, loosen the two Dzues fasteners on the top
of the unit and remove the dust cover. Refer to
Adjustments"
the dust cover once the adjustment is complete.
9.B.
System Protection
The KHF 1050 system is primarily protected by circuit breakers located at the
circuit breaker panel in the aircraft. The KPA 1052 and KRX 1053 contain internal
fuses for additional protection.
9.C.
Lubrication
No lubrication is required. There are no moving parts that require lubrication in the
KHF 1050 HF Communication System.
9.D.
Cleaning
The exterior of the units should be wiped with lint-free cloth dampened with the
approved cleaning agent, when deemed necessary, depending upon
environmental exposure and intensity of use.
Revison 2
N
KHF 1050 SYSTEM INSTALLATION MANUAL
for adjustment locations on the KRX 1053. Replace and secure
"Figure 2019 - KRX 1053
23-10-09
Page 2053
Apr/2006
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