Watkins-Johnson Company R1910, Руководство пользователя, Страница: 43 / 50

Repeater Scheduled Maintenance
4-2
Table 4-1. Scheduled Maintenance Action Index
PM Action
Paragraph
Reference
Schedule
Cleaning outside of equipment 4-4.1 Every 12 months or when dust is seen on the
surface of the equipment.
Inspecting for damage or wear 4-4.2 When the unit is not operating properly.
4-4.1 Exterior Cleaning
Remove loose dirt accumulated on the outside of the unit with a moist paper towel, cloth, or brush.
The brush is good for removing dirt on and around the connectors. Dirt and grease which is not
removed can be cleaned off with a paper towel or cloth made moist with a detergent and water
solution. Do not use an abrasive cleaner.
4-4.2 Inspection for Damage or Wear
Many potential or existing troubles can be detected by making a visual inspection of the unit. For
this reason, a complete visual inspection should be made on a regular basis and whenever the unit is
inoperative. Damage due to overheating may be the result of other less apparent troubles in the unit.
Mechanical parts such as pin connectors and power switch should be inspected for excessive wear,
looseness, misalignment, corrosion, and other signs of deterioration.
4-4.3 Fuse Replacement
WJ PCS repeaters are protected by replaceable fuses and circuit breakers. A blown fuse can result
from a variety of conditions, including improper installation, faulty power supply, excessive output
power levels, AC power line transients, etc. WJ should be contacted if a repeater fuse needs
frequent service.
The R1910 series repeater is equipped with a 250V/3A, 5 x 20 mm Time-Lag Fuse (Buss GMC-3A
or equivalent), located at the power entry module (Fig 4-1). To replace fuse, first push the AC power
1/0 switch to the 0 position (OFF), and remove AC power cord from the unit. Remove fuse holder
with a flatblade screwdriver, replace fuse, and snap back into position. Reconnect AC power cord
and push the AC Power ON/OFF Switch to the 1 (ON) position. The unit should operate normally.
The R1920/30/40 series repeaters are equipped with an AC circuit breaker, located behind the front
access panel (Fig 4-2). Remove the access panel. The power switch, labeled S1, is a DPDT push
button ON/OFF type with a red LED that lights up only when the power supply output voltages are
present. Push it once to disengage AC power from the unit. The circuit breaker, labeled F1, is a
thermally activated device with a push button reset. Push the circuit breaker reset button, a distinct
click should be heard. Now push the AC power switch, a click should be heard and the button
should light up red, indicating that the unit is operating normally. Although not necessary, as an
added measure of safety, the AC power cord can be removed before servicing the breaker.