TM 55-4920-428-13
f. Set the BITE switch to +12V. The DVM shall indicate +11 to +13.
g. Set the BITE switch to +5V. The DVM shall indicate +4.5 to +5.5.
h. Set the BITE switch to 13V RMS. The DVM shall indicate +12 to +14.
i. Set the BITE switch to SAS 1 CROSS. The DVM shall indicate + 1.0 ±0.05 volt. SAS 1 NULL meter shall
read 10 ±2 microamps.
j. Press the SAS 1 FEEDBACK SELECT switch to SELF. Set the BITE switch to SAS 1 SELF. The DVM
shall indicate + 1.0 ±0.05 volt. SAS 1 NULL meter shall read 10 ±2 microamps.
k. Set the BITE switch to SAS 2 CROSS. The DVM shall indicate + 1.0 ±0.05 volt. SAS 2 NULL meter shall
read 10 ±2 microamps.
l. Set the BITE switch to SAS 2 SELF. Press the SAS 2 FEEDBACK SELECT switch to SELF. The DVM
shall indicate + 1.0 ±0.05 volt. SAS 2 NULL meter shall read 10 ±2 microamps.
(1) Servo Amplifier Valve Drive Test. Set SYSTEM SELECT to SAS 1.
(2) Set SAS 1 link test switch to VALVE,
(3) Set SAS 1 FUNCTION SELECT switch to BALANCE,
(4) Connect breakout adapter box (145GS278-20) to SAS 1 cable (145GS278-5) and SAS 1 of the tester.
DVM reads 0 ±0.1 volt,
(5) Set SAS 1 FUNCTION SELECT switch to HARDOVER EXTEND. DVM reads +8.5 ±0.5 volts.
(6) Set SAS 1 FUNCTION SELECT switch to HARDOVER RETRACT. DVM reads –8.5 ±0.5 volts.
(7) Disconnect breakout adapter box. Set SYSTEM SELECT switch to SAS 2.
(8) Set SAS 2 link test switch to VALVE,
(9) Set SAS 2 FUNCTION SELECT switch to BALANCE.
(10) Connect breakout adapter box (145GS278-20) to SAS 2 cable (145GS278-6) and SAS 2 of the tester.
DVM reads 0 ±0.1 volt.
(11) Set SAS 2 FUNCTION SELECT switch to HARDOVER EXTEND. DVM reads +8.5 ±0.5 volts.
(12) Set SAS 2 FUNCTION SELECT switch to HARDOVER RETRACT. DVM reads -8.5 ±0.5 volts.
(13) Set SAS 1 and SAS 2 FUNCTION SELECT switch to BALANCE.
(14) Disconnect breakout adapter box.
m. Connect the ELECTRICAL TEST SET connector to the HYDRAULIC UNIT RECEPTACLE.
n. Press the CYCLE MOTOR switch to ON. The cycle motor shall rotate. The CYCLE MOTOR switch OFF
light shall go out and the ON light shall come on.
o. Press the CYCLE MOTOR switch to OFF. The cycle motor shall stop. The CYCLE MOTOR switch ON
light shall go out and the OFF light shall come on.
p. (Fig. 2-3.) On the hydraulic unit, pull the SOLENOID valve to OPEN position. The valve knob light shall
not come on.
Change 3
2-15
