User's Manual

Repeater Scheduled Maintenance
4-3
The fuse labeled F2 is a 250V/15A, ¼ x 1 ¼ Time-Delay Fuse (Buss MDA-15 or equivalent) on the
+24VDC input line. It requires servicing only for repeaters with +24V input, such as battery
backup. To avoid the possibility of a large spark occurring as the fuse is replaced, it is
recommended that the +24V power source be disconnected while servicing the F2 fuse.
4-5 GENERAL MAINTENANCE
A complete inspection of the unit should be made during the cleaning operation for signs of
mechanical and electrical failures. Mechanical parts, including connectors, should be checked for
wear, loose connections, bad alignment, or other possible causes of defective operation. Worn parts
should be replaced and loose connectors tightened. Check for loose cable connections, and tighten
those connectors. Remove the fuse and check for corrosion or damage, replace when either occurs.
After a repair has been made, alignment should be carried out, if necessary, and appropriate
performance tests should be used to verify proper operation.
4-6 ALIGNMENT
This unit requires that the gain be set correctly for both server and donor paths, to avoid oscillation.
See section 2-8.
4-7 REPAIR
All repairs to WJ PCS repeaters should be performed by a Watkins-Johnson authorized technician.
Any unauthorized repair could void the warranty.