TM 55-4920-428-13
CONTROL OR INDICATOR
DESCRIPTION
(Fig. 2-2)
VALVE CONTROL R4 (R3)
SQ WAVE control R2 (RI)
FEEDBACK SELECT switch/
indicator S15 (S13)
LINK TEST switch S9 (S7)
METER X10 switch S6 (S4)
NULL meter M2 (Ml)
EXTERNAL METER
SELECT switch S2 (S1)
EXTERNAL METER jacks
J5 and J4 (J3 and J2)
Variable resistor. When corresponding FUNCTION SELECT
switch is at CLSD LOOP, sets corresponding extensible link to
any position between hardover retract and hardover extend.
Variable resistor. When corresponding FUNCTION SELECT
switch is at SQ WAVE, sets maximum stroke length of extensi-
ble link. Extensible link oscillates at 30 strokes per minute.
Push on/off indicating switch.
Push to latch – SELF indicator comes on and self feedback
voltage is indicated on corresponding NULL meter.
Push to unlatch – CROSS indicator comes on and cross
feedback voltage is indicated on corresponding NULL meter.
3-position rotary switch. Functional when SYSTEM SELECT
switch is at corresponding SAS position.
VALVE – Servo valve voltage is indicated on DVM.
CROSS FDBK – Cross feedback voltage is indicated on
DVM.
SELF FDBK – Self feedback voltage is indicated on DVM.
Momentary pushbutton switch. Changes range of NULL meter.
Displays null selected by the SYSTEM SELECT switch.
Released – Corresponding NULL meter indicates a 50-0-50
microampere range.
Pressed – Corresponding NULL meter indicates a 5-O-5 mi-
croampere range.
50-0-50 microammeter. Meter indicates amplitude and polarity
of corresponding self or cross feedback voltage as selected by
FEEDBACK SELECT switch.
4-position rotary switch. Connects voltages to associated EX-
TERNAL METER jacks as follows:
SELF FDBK – Corresponding self voltage is displayed.
CROSS FDBK – Corresponding cross voltage is displayed,
REF – 13 volts ac 400 Hz reference voltage is displayed.
Covered + and – pin jacks for connection of external meter,
Used with EXTERNAL METER SELECT switch.
Change 3
2-5
