Delta 403 Installation Manual download pdf (Page 5)

TROUBLESHOOTING PROCEDURE

SIGNAL INDICATION VOLTAGE LEVEL

CAS

RUS

Sq Dis, Input

CCT Sq Dis, Input

TX Enable

PTT, Input

High Level

Low Level

High Level (RX Un-sq)

Low Level (RX Squelched)

Low Level (RX Mute/PTT)

Pulled low (RX unsquelched)

Logic Low (Sq. Dis)

Logic High (Sq)

RX Un-Sq

Logic Low

Logic High

Logic Low

Logic High

Logic Low

Logic High

9.0 Vdc

0.15 Vdc

9.0 Vdc

0.15 Vdc

0.6 Vdc

0 Vdc

2.4 Vdc

0.14 Vdc

0.35 Vdc

5.5 Vdc

2.0 Vdc

9.0 Vdc

1.0 Vdc

13 Vdc

CURRENT REFERENCE CHART

SERVICE

PLUG

FUNCTION TYPICAL CURRENT/mA

P701

P702

P703

P704

P705

TX 90, RX 80

TX 45, RX 75

TX 40, RX 55

TEST POINT DATA (Typical)

TEST POINT VOLTAGE CONTROL DESCRIPTION

J602-3

9.0 ±0.05 Vdc

R703 9 Volt Regulator

J602-2 13.2 Vdc (A+)

J202 3.0-7.5 Vdc C220 (RX)

L209 (TX)

VCO Control Voltage

(See Synth Align)

J353 0.7 VPP Reference Osc. Output (high

impedance)

J352 5.5 Vdc (Nominal) Reference Oscillator

compensation line voltage

J712 5.0 Vdc VCC to Microcomputer

(Cont.)

TYPICAL PERFORMANCE INFORMATION

SIGNAL LEVELS

(Cont.)

TYPICAL PERFORMANCE INFORMATION

RADIO CONNECTOR IDENTIFICATION

Front Connector

Systems Metering

Option Connector

PROM Program Plug

RF Metering

RX Input

IF Input

RX Inj.

Exciter Input

Exciter Output

Hand Programmer Enable

Program Disable

TX PA Metering

VG Interface

Fixed Squelch

Channel Guard

Aux Audio

DPTT

IGN A+

J601

J602

J603

J711

J101

P401

P404

P451

P102

P101, P103

P706

P707

P612

P605

P608

P610

P402

P403

TRANSMITTER QUICK CHECKS

– Connect red system metering plug to J602, system metering.

– Connect black plug of GE Test Set to RF Metering jack J101. Set polarity to "+" and voltage range to the 1 volt

position (Test 1).

EXCITER

RANGE

POSITION

RF METERING J101

EXCITER READINGS

PROBABLE CAUSE

METERING READINGS

TEST

POS.

METERING

JACK J101

FUNCTION

METER

SCALE

TYPICAL

READING

HIGH LOW

TEST 1 A J101-10 AMPL-1 0-1 0.2V

Q101

Shorted

R101, R103

Open

Q101 Open; R103, R105,

Open; L103 Open;

Oscillator/ Buffer

Defective

TEST 1 B J101-9 TRIPLER 0-3 0.2V

Q102

Defective; R107

Open

Q102 Shorted; R110 Open;

L104, L105, and associated

circuits, defective or

improperly tuned.

TEST 1 C J101-8 AMPL-3

REL PWR

OUT

0-1 0.5V

Helical Coil

L114

Shorted Or

Mis-tuned

Q103 OR Q104 defective.

Check resistors, capacitors

around Q103 and Q104.

Helical coils L107, L108

mis-tuned or defective.

D101 and associated

metering circuits defective.

RECEIVER READINGS SYSTEM JACK, J602

TEST POS FUNCTION SCALE

TYPICAL

READING

D IF AMP 1V 0.75

H RX INJ 1V 0.55

LBI-31511 LBI-31511

1 2 3 4 5 6 7 8 9 10 ... 17 18

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Delta 403 Installation Manual Page 5

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