CHAPTER 2 VAP-AIR MODELS

TB 9-2920-225-34-1

CHAPTER 2

VAP-AIR MODELS

Section I. INTRODUCTION

there is no equivalent NSN number. An assembly

2-1. Introduction. Four models were produced by

is available from Bendix.

Vap-Air, a division of Vapor Corporation.

CODE IDENT 77820 (FSCM)

Code Ident 80234 (FSCM)

Bendix Corp.

Vapor Corp.

The Electrical Components

6420 W. Howard St.

Div.

Chicago, IL 60648

Sherman Ave.

In 1978, the voltage regulator product line was

Sidney, NY 13838

sold to DC Electronics Corporation.

Code Ident 34904 (FSCM)

It should be ordered as part number 6042228-

DC Electronics Inc.

10S; it will arrive as a complete assembly with

544 N. Highland Ave.

the shell marked 8701337.

Aurora, IL 60506

b. Regulator Box Assemblly (internal). If water

TELEPHONE AC 312844-5170

leakage or corrosion is detected, it is possible that

DC Electronics now provides parts and engineer-

extensive damage has been done and the regulator

ing support for all Vap-Air models. The Vap-Air

cannot be easily repaired. Components should be

part numbers for each model are:

performance tested and retained if acceptable.

26440001-01

Check for disconnected or burnt wires, missing

2644000103

components, and replace repair as necessary.

26440001-04

Carefully remove the transistor mounting plate,

26440001-05

noting the position of the screws, washers and

rubber insulators. Visually inspect the circuit

2-2. General Inspection. This chapter applies to

board for burnt components. Replace the circuit

all Vap-Air models.

board through cannibalization if burnt compo-

a. Regulator Box Assembly (external). Check

nents are found. Carefully reinstall the transistor

for missing or stripped cover, connector mount,

mounting plate.

retainer screws, and voltage adjustment access

c. Regulator Verification Check. After perform-

plug.

ing the above inspection, if the regulator appears

Check connectors for signs of arcing, bent, or

to be in good condition, check its performance on

pushed in pins, broken connectors, and thread

a test stand. If the regulator fails this check, pro-

damage. Correct deficiencies by utilization of serv-

ceed to the following component tests.

iceable components from unrepairables or requisi-

2-3. Bench Testing. Figures 21 and 22 show the

tioning components from the manufacturer.

method for testing NPN transistors; these figures

(1) The pin receptacle (J2) is P/N 7064706

apply to all models in this chapter. If the original

FSCM 19207 or MS3102A28-22P FSCM 96906

transistors are replaced with substitute part num-

per MIL-C-5015.

bers, the repaired regulators should be carefully

(2) The socket receptacle (Jl) is P/N 7064-

tested to ensure proper operation.

706 FSCM 19207, an Army number for which

2-1