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21
2.5 Maintenance
This section describes maintenance procedures for the L-854 Radio Control Equipment.
Prior to undertaking any maintenance to this unit, refer to
Theory of Operation
in the
Description
section.
2.5.1 Introduction
The only maintenance recommended by people other than skilled radio technicians is
changing the fuses and circuit boards. If a problem develops in the unit, make the following
checks:
1. See Table 4. Make sure that power is coming into the unit by measuring the AC or DC
voltage across input power line on Terminals 12 and 13.
NOTE:
If a fuse is blown, replace only with the same size fuse. If the fuse blows again after
replacement, consult ADB Technical Service to analyze the problem. See Section “Power
Supply Board” on page 12 for additional information regarding the Power Supply board.
2.5.2 Receiver Frequency
Setting
To set (or change) the operational frequency use the front panel
(down) and
(up)
buttons to select the frequency. Once the correct frequency has been displayed, press the
ENTER button once. After the display shows VERIFY press and hold the enter button for five
seconds to move the frequency to non-volatile memory, and move the receiver to the new
frequency.
NOTE:
The operating frequency is adjustable in steps of 25.0 KHz (0.025 MHz) between
118.0 and 136.0 MHz VHF.
The frequency will be retained if power is lost to the Radio Control Equipment.
WARNING
This equipment contains semiconductor devices and integrated circuits.
Static electrical charge buildup in the human body can destroy integrated
circuits. Wear a commercially approved ground strap when handling printed
circuit boards containing integrated circuits. Wearing a ground strap
discharges any static charge buildup to ground and ensures the safety of
the integrated circuit. For information on using the ground strap, refer to the
ground strap instruction manual.
Failure to follow these warnings may result in serious injury or
equipment damage.
