Paragraphs 6-1 to 6-9
TROUBLESHOOTING
6-1. TROUBLESHOOTING.
6-7. Replace electrical wire using stranded electrical
wire conforming to Military Specification MIL-W-
16878, Type E, 200oC, silver-plated, AWG 22, or
6-2. System troubleshooting may be facilitated by
equivalent. See applicable wiring diagram for color
referring to troubleshooting chart, table 6-1. Chart
code and connection ir formation. Replace bus wires
has been subdivided into three headings: trouble,
with solid wire (Federal Specification QQ-W -343,
probable cause, and remedy, and is designed to help
Type S) soft coated, AWG 22. Use vinyl tubing,
maintenance personnel isolate a fault to a particular
Grade C (Military Specification MIL-I-631, TYPe F)
component or subassembly. only basic malfunctions
when replacing insulation.
are listed in table 6-1. A careful preliminary in-
spection of equipment may help to isolate trouble or
give an indication of cause of failure. Before looking
for troubles in the system, check operating proce-
zation circuit will remove residual magnetism in a
dures to make certain suspected trouble is not
transmitter or monitor sensitive element when the
caused by incorrect operation of unit.
following steps are cor ducted.
6-3. Console contains eight subassemblies. If Con-
sole is suspected of faulty operation during compass
swing, refer to troubleshooting chart, table 6-1, to
Connect Field Tester cable assembly end W4P2 to
localize trouble. Figure 6-1 illustrates test setup
Console connector 1J4. Connect Field Tester cable
for demagnetization.
assembly end W4P3 to Console connector 1J3. Con-
nect cable assembly of unit to be demagnetized to
Field Tester cornnector 5J1 DEMAG. See figur
wiring diagrams for Compass Calibrator.
b. Set controls of Console as follows:
E1 NORM. -REV. to OFF.
E2 NORM. -REV. to OFF.
On the schematic diagrams, wire cross-
MODE SELECTOR to MON.
references read from the bar to the part in
POWER ON-OFF switch to POWER ON.
the following order: Bar Letter, Destination
Reference Designator and Pin Number (if
any), and Color Code.
c. Rotate VOLTS ADJUST control on Console to
obtain a reading of 23.5 volts on EXC VOLTS meter.
Allow 2-minute warm-up period.
6-5. REPAIR AND REPLACEMENT.
d. Set Field Tester switch S1 to DEMAG. and
rotate R1 DEMAG. control fully counterclockwise.
e. Rotate Field Tester R1 DEMAG. control slowly
on all units and parts. Secure all transistors, ca-
to full clockwise position and back to full counter-
pacitors, and other clip-mounted parts to their re-
clockwise position. Set Field Tester switch S1 to OFF.
spective mounting cfips with clear Glyptal (Federal
Stock No. 5970-166-8811). Apply clear Glyptal to
head of each screw and washer and secure tightly.
6-9. Perform a four-heading (0, 90, 160, and 270)
Use 60/40 rosin core wire solder (Federal Specifi-
cation QQ-S-571, Type SN60 WRAP 2) for electrical
manual swing to check demagnetized unit. If results
are still out of tolerance, replace unit.
connections.
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