TB 9-6625-1014-35
10. QX1 Rheostat
a. Performance Check
(1) Disconnect TI from ac source and set CIRCUIT SELECTOR switch to L and D-QX1.
(2) Remove shorting strap from EXT D-Q binding post.
(3) Connect dc detector to resistance bridge (part of resistance measurement
system), using straps supplied with dc detector.
(4) Connect lead from resistance bridge UNKNOWN 1 terminal to TI EXT D-Q HI
terminal, and connect lead from resistance bridge UNKNOWN 2 terminal to TI C (high) terminal.
(5) Set the Q and D-Q dial to 6.3 on black scale.
(6) Adjust resistance bridge for a null indication on dc detector. If resistance bridge
does not indicate between 9930 and 10,130 Ω, perform b( 1) through (4) below.
(7) Set TI CIRCUIT SELECTOR switch to L and QX100.
(8) Turn Q and D-Q dial to 6.3 on black scale.
(9) Connect clip and cable from resistance bridge UNKNOWN 1 terminal to center
terminal of variable resistance R24 (fig. 1), and connect lead from resistance bridge
UNKNOWN 2 terminal to EXT D-Q HI binding post.
(10) Adjust resistance bridge for a null indication on dc detector. If resistance bridge
does not indicate between 65 and 67 Ω, perform b(1), and (5) through (7) below.
(11) Set CIRCUIT SELECTOR switch to C and D-QX.01 position.
(12) Adjust resistance bridge for a null indication on dc detector. Resistance bridge
will indicate 99 to 101 Ω.
(13) Set CIRCUIT SELECTOR switch to C and D-QX.1 position.
(14) Set Q and D-Q dial to 6.3 on black scale.
