TM 55-4920-429-13
Table 2-1. Test Set Controls and Indicators — Continued
CONTROL/lNDICATOR
DESCRIPTION
DMM DISPLAY. Provides test logic ground to light all decimal
points and number segments in digital display. Provides a test reading
of four 8s, each preceded by decimal point display and + sign.
AFCS ANNUNCIATOR Switch
AFCS ANN switch S10
HDG SEL S30
DASH PRE-ENGAGE S31
DMM +5 VDC. Monitors +5-volt supply on digital display.
DMM +15 VDC. Monitors +15-volt supply on digital display.
DMM -15 VDC. Monitors -15-volt supply on digital display.
+3.6 VAC. Monitors in-phase 3.6 vac supply on meter.
-3.6 VAC. Monitors out-of-phase 3.6 vac supply on meter.
+13 VAC. Monitors in-phase 13 vac supply on meter.
+26 VAC. Monitors in-phase 26 vac supply on meter.
-7 VDC. Monitors -7 vdc supply on meter.
+7 VDC. Monitors +7 vdc suppIy on meter.
+12 VDC. Monitors +12 vdc supply on meter.
-15 VDC. Monitors -15 vdc supply on meter.
+15 VDC. Monitors +15 vdc supply on meter.
+28 VDC. Monitors +28 vdc supply on meter.
Single switch which operates independently.
Controls AFCS annunciator by connecting and disconnecting 28 vdc
return.
ON. Checks circuit and lights of AFCS annunciator.
OFF. Disconnects ground.
Switch, toggle, 2-position.
Duplicates function of HDG SEL switch on AFCS panel.
ON. Engages heading select.
OFF. Heading select disengaged.
Switch, toggle, 2-position.
Allows remote control of dash actuator.
ON. Applies power to dash actuator.
OFF. Power disconnected from dash actuator.
NOTE
1. Test points selected by CONTINUITY A and B SELECT switches are internal wiring con-
nections between contacts of switches S26, S27, S28, and S29 and all used contacts in con-
nectors J1 and J3, with the exception of those pins used for the high side of the master
power 115 VAC and 28 VDC test set inputs.
2. Only FDBK SELF signals are used in the test of their respective servo circuits; SUM 1 and
SUM 2 signals are monitored only.
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