COMPONENT MAINTENANCE MANUAL
IN 1502H RADAR INDICATOR
TM109102
5-11
May/01
(3) Reinstall transistor insulator and power transistor using hardware removed in step (1).
NOTE:
Electrical contact to the transistor case is made through the mounting
hardware on some power transistors. Always reinstall the original hardware.
Do not omit washers and spacers.
(4) After installing replacement transistor but before making any electrical connections,
measure resistance between case of transistor and the chassis to ensure that the
insulation is effective. The resistance measured should be greater than 10 megohms.
(5) Reconnect leads to transistor and solder in place.
G. Replacing Multi-lead Components (ICs, etc.)
(1) Standard Method
(a) Remove component by clipping each lead along both sides. Clip off leads as close
to the component as possible. Discard component.
(b) Heat hole from track side and remove clipped lead from each hole.
(c) Melt the solder in each hole and, using a desoldering suction tool, remove solder
from each hole.
(d) Insert replacement component, observing correct orientation.
CAUTION:
AVOID USE OF EXCESSIVE HEAT.
(e) Solder component in place from the track side of the board. Avoid solder runs. No
solder is required on contacts where no track exists.
(2) Optional method
With a Pace Model PRC-150 Bench-Top Repair Center (Silver Spring, Maryland), any
mulit-lead component can be quickly and easily removed without damaging the
component or the PC board.
H. Wiring Repairs
NOTE:
When it is necessary to disturb the dress of the wires, ensure that the original
dress is maintained when replacing wires.
Replace damaged wiring with same size wire and color code. Ensure that no bare wires
are touching chassis, other bare wires, metal cases or other parts.
If wire is being removed from a terminal or component, tag wire to prevent incorrect
connections.
The document reference is online, please check the correspondence between the online documentation and the printed version.
