CHAPTER 4 LELAND AIRBORNE MODEL

TB 9-2920-225-34-1

CHAPTER 4

LELAND AIRBORNE MODEL

4-1. Introduction. One model was produced by

washers and rubber insulators. Visually inspect

Leland Airborn Products Division of American

the circuit board for burnt components. Replace

Machine and Foundry Co. The manufacturer's

the circuit board through cannibalization if burnt

name is now:

components are found. Carefully reinstall the

transistor mounting plate.

CODE IDENT 07639 (FSCM)

Leland Electrosystems Inc.

c. Regulator Verification Check. After perform-

740 E. National Road

ing the regulator appears to be in good condition,

P.O. BOX 128

check its performance on a test stand.

Vandalia, OH 45377

If the regulator fails this check, proceed to para-

TELEPHONE AC 513898-5881

graph 43.

The manufacturer is also now known as AMF

4-3. Bench Testing.

Electrosystems Division at the same address. The

manufacturer's part number for this model is CSV

a. General. Figures 4-1 and 4-2 show the

2183-1.

method for testing NPN transistors. Figure 4-3

shows a plan view of the circuit board assembly,

4-2. General Inspection.

the regulator with the cover and circuit board re-

moved, and an electrical schematic diagram of the

a. Regulator Box Assembly (external). Check

regulator.

for missing or stripped cover, connector and

mount retainer screws and voltage adjustment ac-

b. Diode and Relay.

cess plug. Check connectors for signs of arcing,

(1) Remove six screws and place the circuit

bent or pushed in pins, broken connectors and

board to one side.

thread damage. Correct deficiencies by utilization

(2) Place positive probe of ohmmeter to pin

of serviceable components from unrepairables or

F of connector J2, (see fig. 4-3).

requisitioning components from the manufacturer.

( 3 ) Place negative probe to TP1. Meter

The pin receptacle (J2) is part number 19207

should indicate low resistance.

7064429 or MS3102A2822P per MIL-C-5015.

(4) Reverse probes. Meter should indicate

The socket receptacle (Jl) is part number 19207-

high resistance.

7064706, for which there is no equivalent NSN

(5) If other readings are obtained, replace

number.

diode CR6, (see fig. 4-3).

As assembly is available from Bendix.

(6) Move negative probe to TP2. Meter

should read approximately 250 ohms.

CODE IDENT 77820 (FSCM)

Bendix Corp. The Electrical

(7) If another reading is obtained, replace

Components Div.

the relay, (see fig. 43).

Sherman Avenue

c. Field Discharge Diode.

Sidney, NY 13838

(1) Place positive probe of ohmmeter to pin

It should be ordered as part number 6042228

E of connector J1 (see fig. 4-3).

10S, it is possible that extensive damage has been

(2) Place negative probe to pin B of J1.

done and the regulator cannot be easily repaired.

Meter should indicate low resistance.

Components should be performance tested and re-

(3) Reverse the probes. Meter should indi-

tained if acceptable. Check for disconnected or

cate high resistance.

burnt wires, missing components and replace/re-

(4) If other readings are obtained, replace

pair as necessary. Carefully remove the transistor

diode CR7.

mounting plate noting the position of the screws,

4-1