TM 11-5840-360-14-1-1
NOTES:
WARNING
1. The synchro control transformers
APPROXIMATELY
+17
KV
DC
at the AN/SPA-25 and AN/SPA-66
(REGULATED) IS PRESENT ON ONE
indicators are zeroed for operation
OF THE RED LEADS FROM THE
with other ships radars; do not
POIVER SUPPLY TO THE CATHODE
adjust these synchros.
RAY TUBE WHEN THE INDICATOR IS
OPERATING
2. If the heading flashes on the AN/
SPA-25 and AN/SPA-66 indicators
5.12.1 Troubleshooting Procedure
occur within 10 of 0 relative,
loosen the adjustment locking nut at
Fault isolation within the 1P-1282 and IP 1283
the
pedestal
and
move
the
Indicators is facilitated by use of Troubleshooting
adjustment arm to place the heading
Charts; Figure 5-8 provides information for overall
flashes at 0relative.
Indicator
troubleshooting;
provides
information for troubleshooting the Indicator power
5.11.3.3 Belt Tension Adjustment. - The belt tension
supply assembly.
Instructions for use of the
adjustment procedure is contained in Preventive
troubleshooting charts are given in paragraph 5.9.1.
Maintenance, Section II; refer to paragraph 5.7.1.3.
The Indicators contain several digital processing printed
circuit boards (PCBs) for which flow-chart type
5.11.3.4 Sheave Alignment. - The sheave alignment
troubleshooting data is impractical. Troubleshooting
procedure is contained in Preventive Maintenance,
data for these PCBs is presented in tabular form on
sheets 11 through 14 of Figure 5-8. Where applicable,
the flow-chart portion of the Indicator troubleshooting
5.12 AZIMUTH RANGE INDICATORS 1P-1282 AND
chart (sheets 1 through 10 of Figure 5-8) contains
1P-1283
references to this tabular data; when such references
are encountered, use the following general procedure to
troubleshoot the PCB to which the reference table
related subparagraphs provide corrective maintenance
applies:
for the 16-inch Azimuth Range Indicator 1P-1282 and
the 12-inch indicator 1P-1283. The information includes
1. Set the Indicator POWER switch to OFF and
troubleshooting instructions (5.12.1), removal and
mount the PCB in the extender card. Insert the
replacement procedures (5.12.2) and alignment
extender card into the card slot and set Indicator
procedures (5.12.3). The locations of assemblies and
POWER switch to TX ON.
major components within the Indicators are shown in
2. Using the OUTPUT DATA section of the
Figure 5-7. Schematic diagrams, parts list tables and
referenced table, check each output pin for the correct
assembly drawings applicable to the 1P-1282 and 1P-
signal.
1283 Indicators are contained in Section 6.4 of Chapter
3. When the erroneous output is located, refer to
6.
the REQUIRED INPUTS column to identify the input
Access to the electronic assemblies within the
signals associated with the erroneous output.
Indicators is provided by loosening the one-quarter turn
captive fasteners and removing the upper front access
cover. When the cover is removed, an interlock switch
is activated which disables the Indicator power supply;
the interlock switch may be pulled outward to permit
Indicator operation for troubleshooting or alignment.
Access to the electrical connections of the front panel
controls and indicators, the panel lamps, and the cursor
and compass mechanisms is obtained by loosening the
two captive screws in the bezel (sloping front panel)
assembly and raising the bezel until it locks into position
(two locking positions are provided).
5-35
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