Incorrect Effect Caused By
Open UX-226 filament winding and
potentiometer Open UY-227 filament winding and
potentiometer Open UX-171 filament winding and
Across filament contacts of UX-280 socket
potentiometer Open UX-280 filament winding
Grid contact to plate contact of UX-280 socket
Open high voltage winding of power transformer
UX-171 potentiometer adjusting screw to terminal
No. 10
Terminal No. 11 to plate contact of UX-280 socket
Open high voltage winding of power transformer or
filter reactor
Open primary of power transformer or line switch.
If open throw switch to other position and test. If
both open test switch separately.
Figure 20—R. F. transformer connections and color scheme of wiring
PART II — MAKING REPLACEMENTS (1) REPLACING
VOLUME CONTROL
The following procedure should be used when replacing the volume control.
1. Be move the seven screws holding the wooden back to the cabinet.
2. Remove knobs on "Station Selector" and "Volume Control."
3. Release the cable connecting the socket power unit to the chassis assembly and the two leads to
the pilot lamp. This is done by loosening the screws holding them to the terminal strip of the socket
power unit.
4. Remove four screws holding chassis in place to bottom of cabinet. The chassis may now be
removed by rocking it in the cabinet and slipping it out of
24
SOCKET POWER
Remove Radiotron UX-280
UNIT CONTINUITY TESTS and Disconnect
Cable at Terminal Strip
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