By Walter Cates WD0GOF (UPDATE 10/30/2013)
27
3-5-2. K2 K3 CLEANING:
Spray strip of paper with DeOxit, insert it between the NO contacts, compress the armature and pull the paper,
repeat several times.
Spray strip of paper with DeOxit, Insert it between the NC contacts, pull the paper and repeat several times.
3-5-3. NON-STANDARD RELAY REPLACEMENT
If it turns out that only one of the original relays is salvageable you may want to consider the following.
Warning this modification should be undertaken only by an experienced technician. A moderate level of skill in
reading schematics and tracing ckt wiring is required
. Install the working original relay in the K2 position. Find
a suitable 12 VDC relay and install it for K3. We will pick up 12.6vac from the filament line rectify it, filter it
and connect it to one end of the replacement relay coil. Place a reverse diode across the coil. The other end of
the coil will connect to the unused, grounded in receive mode terminal of K1. All of the components, with the
exception of the resistor, can be mounted on one 4 contact terminal strip and mounted anyplace that pleases you
Summary of Contents for SR-150
Page 18: ...By Walter Cates WD0GOF UPDATE 10 30 2013 18...
Page 19: ...By Walter Cates WD0GOF UPDATE 10 30 2013 19 BEFORE CLEANING CLEAN CHASSIS...
Page 20: ...By Walter Cates WD0GOF UPDATE 10 30 2013 20 3 1 2 TUBE SOCKET CLEANING KIT...
Page 21: ...By Walter Cates WD0GOF UPDATE 10 30 2013 21 3 1 3 AIR VARIABLE CLEANING...
Page 30: ...By Walter Cates WD0GOF UPDATE 10 30 2013 30 3 5 5 K3 WIRING AND PIN OUT...
Page 38: ...By Walter Cates WD0GOF UPDATE 10 30 2013 38 4 DATA SHEETS...
