COMPONENT MAINTENANCE MANUAL
IN 1502H RADAR INDICATOR
TM109102
4-10
May/01
C. Horizontal Astable Adjustment, Sweep Module
NOTE:
The purpose of this portion of the alignment is to adjust the free-running period
of U8, an astable 555 multi-vibrator on the Sweep Module, to 67.0µsec. Once
properly adjusted, the output pulses of U8 can be prematurely truncated via the
reset pin of U8, thereby allowing U8 to synchronize to the horizontal retrace
pulses of the composite video signal. Note that the synchronized period of U8
should be 63.5µsec in RS-170 mode and 64.0µsec in CCIR mode.
1. Remove the Sweep Cover, if required.
2. Set the FLIR ENABLE switch to the up position.
3. Set the RS170 / PAL switch to the PAL position.
4. Preset the RADAR Horizontal Size control, R34 on the Sweep Module, to the approx-
imate mid-position. (Setting this pot to far towards the CCW position may cause the
High Voltage to be disabled).
5. Ground TP10 on the Sweep Module.
6. Connect the O-Scope to TP12 on the Sweep Module.
7. Set the UUT power switch on the test panel to the ON position.
8. Adjust R93 on the Sweep Module so that the free-running period of U8, as measured
at TP12, is 67.0 ± 1.0 µsec. Check the data sheet.
9. Return the UUT power switch on the test panel to the OFF position.
10. Remove the ground from TP10.
11. Remove the O-Scope connection.
12. Set the FLIR ENABLE switch to the down position.
D. High-Voltage Power Supply Alignment
NOTE: This section is only required if the HVPS was not tested per the "IN-1502H High
Voltage Power Supply Assembly Test Procedure" - 923-01411-0001.
NOTE:
SYNC ADJUSTMENT - The HVPS Module may be aligned and tested on the
HVPS test fixture before installation into the IN-1502H. If so, then the following
four steps may be skipped. If the HVPS Module has not been pre-aligned on
the HVPS test fixture, then the following four steps must be performed.
1. With the UUT turned off, apply +9VDC from an external DC power supply to TP3 on
the HV Regulator Module.
2. Connect the negative lead of the DC power supply to chassis ground.
3. Adjust the HVPS Sync control, R15 on the HV Regulator Module, for a waveform with
a period of 64.5µsec on TP6. Check the data sheet.
4. Remove the DC power supply from TP3.
The document reference is online, please check the correspondence between the online documentation and the printed version.
