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As an aid in troubleshooting, a number of diagnostic LED indicators are
provided on the NAVIGAT X MK 1 PCB. These indicate the presence of
supply voltages, activities on the serial data I/O lines and the current
states of the status I/O ports.
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TB 8
follow-up step motor
TB 9
main power supply transformer
J 1
shaft encoder
J 2
cooling fan
J 3
Control and Display Unit
J 4
gyrosphere power supply and pick off contacts
J 6
service interface RS 232 (for factory use only)
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R 103
gyrosphere current test resistor, 1
Ω
;
voltage across R 103 in mV equals gyrosphere current in mA;
current should not exceed 500 mA at power-up and must
drop below 320 mA within around 45 minutes after power-
up
R 36
gyrosphere voltage adjustment
(factory-set, normally no adjustment required in the field)
Nominal gyrosphere operating voltage is 100 VAC @ 337 Hz.
For a present operating voltage of 100 VAC on the master
PCB, 105 VAC true RMS at the R 36 potentiometer are neces-
sary.
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CR 1
green
24 VDC backup supply power present
CR 2
red
24 VDC backup supply polarity reversed - swap
lines
CR 5
red
overload 24 VDC out to cooling fan - check fan
CR 8
green
+ 12VDC on-board supply present
CR 9
green
+ 5VDC (Vcc) on-board supply present
CR 10
red
overload 24 VDC out TB1.3/1.4
CR 12
green
115/230 VAC main supply power present
CR 15
red
overload 12VDC out to Control and Display unit
CR 17
green
activity on Tx line, nav. data printer
Содержание 4914-CA
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