Learning Event 2: Adjust PPI Delay Control - Continued

Adjustment of PPI, IFF, and Precision Display, and PPI Delay Control
Page Navigation
43

e. Locate the release handles and disengage them.

Pull the

drawer forward and locate the INTERLOCK switch S102.

Pull the

INTERLOCK switch forward.

Release handles and INTERLOCK located on

synchronizer-generator, marker-electronic SN-386/FPN-40 (Figure 10).

NOTES: The INTERLOCK-switch must be pulled forward to restore

power to the synchronizer-generator SN-386/FPN-40.

An INTERLOCK serves as an OFF/ON switch. Because of its

design the INTERLOCK provides additional functions.

First, it removes the power from the unit when an

operator opens a panel or drawer.

This provides safety

for the operator. Secondly, when testing is required by

the repair person, it restores power to the unit when

placed in its most forward position.

f. Locate the timing control card A1900 inside

synchronizer-

generator, marker-electronic SN-386/FPN-40 (Figure 41).

g. Locate the PPI DELAY control R1903 on timing control card

A1900 (Figure 41).