NORTHROP GRUMMAN Sperry Marine NAVIGAT X MK 2, Assembly Instructions Manual

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056341 Rev. AA NAVIGAT X Mk 2
Page 7-4 7: Troubleshooting / Corrective Maintenance
IC Function Stock No.
IC 6 UART 046537-0000-000
IC 12 follow-up motor phase 2 driver IC 045871-0000-000
IC 13 follow-up motor phase 1 driver IC 045871-0000-000
IC 21 UART 046537-0000-000
IC 29 quad RS-422 output driver IC;
drives AD10 data/clock, Comp. Monitor,
Ext. Display Unit
046485-0000-000
IC 35 software flash-memory IC,
pre-programmed
020669-0000-000
IC 37 quad RS-422 output driver IC;
drives Sens Data 1/2, FAST, SUPERFAST
046485-0000-000
R Function
R 54 gyrosphere current test resistor, 1
Ω
;
voltage accross R 54 in mV equals gyrosphere current in mA;
current should not exceed 500 mA at power-up and must drop below
300 mA within 45 minutes after power-up
R 9 gyroshpere voltage adjustment
(factory-set, normally no adjustment required in the field)
nominal gyrosphere voltage is 100 VAC @ 337 Hz.
R 167 display contrast adjustment
(factory-set, normally no adjustment required in the field)