Delta 403 Installation Manual

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LBI-31511B
Printed in U.S.A.
TABLE OF CONTENTS
Page
DESCRIPTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Front Cover
INITIAL ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Front Cover
MAINTENANCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
PREVENTIVE MAINTENANCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
PA TRANSISTOR REPLACEMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
REMOVING IC’s . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
REPLACING CHIP COMPONENTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
PROGRAMMING AND ALIGNMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
SERVICE TIPS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
TEST AND TROUBLESHOOTING PROCEDURES . . . . . . . . . . . . . . . . . . . . . . . 4
TRANSMITTER ALIGNMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
RECEIVER ALIGNMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
RECEIVER AUDIO AND SQUELCH WAVEFORM CHECKS . . . . . . . . . . . . . . . . . . 14
MECHANICAL LAYOUT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
INTERCONNECTION DIAGRAMS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
MAINTENANCE MANUAL
403-430 MHz & 450-512 MHz, DELTA-S NARROWBAND
TWO WAY FM RADIO
SERVICE SECTION
DESCRIPTION
The service section of this manual contains the diagnostic
routines, and other maintenance information to service this
radio. The service section includes:
System interconnections.
Mechanical layout.
Disassembly procedures.
Replacement of IC’s chip capacitors and resistors.
Alignment procedures for the transmitter and re-
ceiver.
Troubleshooting flow charts and waveforms.
INITIAL ADJUSTMENT
After the radio has been installed (as described in the
Installation Manual), the following adjustments should be
made by a certified electronics technician.
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1 2 3 4 5 6 ... 17 18

Summary of Contents

Page 1 - SERVICE SECTION

LBI-31511BPrinted in U.S.A.TABLE OF CONTENTSPageDESCRIPTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Page 2 - • To remove the TRS board:

TEST CABLE TRANSMITTER ALIGNMENT19C850590G1(19C850593, Rev. 4)SYNTHESIZER AND TRANSMITTER ALIGNMENTTEST EQUIPMENT REQUIRED1. Watt meter, 50 ohm (capab

Page 3 - PROGRAMMING AND ALIGNMENT

TRANSMITTER ALIGNMENTSYNTHESIZER & TRANSMITTER ALIGNMENTEXCITER TRANSMITTER POWER AMPLIFIERPreset all four tuning screws in the exciter (C8-C11) s

Page 4 - SERVICE TIPS

RECEIVER FREQUENCY ADJUSTMENT(Refer to Transmit Frequency Adjustment, no adjustment ofreceive frequency is required.)ALTERNATE IF SWEEP ALIGNMENT1. At

Page 5 - TROUBLESHOOTING PROCEDURE

RECEIVER ALIGNMENT(Cont.)RECEIVER ALIGNMENTTEST EQUIPMENT REQUIRED (Or Equivalent)1. GE Test Set 4EX3A11, 4EX8K12, or 20,000 ohms-per-volt millimeter

Page 6

STEPMETERING POSITIONTUNINGCONTROLMETERREADINGPROCEDUREGE TESTSETMULTIMETER (- TO A-)FIXED SQUELCH ADJUSTMENT (8 dB SINAD) (EARLIER MODELS)11. R666 Ad

Page 7 - RECEIVER TEST PROCEDURE

(19D901350, Sh. 1, Rev. 10)RECEIVER AUDIO AND SQUELCH WAVEFORM CHECKSLBI-31511 LBI-3151114

Page 8

(19D900977, Sh. 1, Rev. 20)MECHANICAL LAYOUTLBI-31511 LBI-3151115

Page 9

(19D900977, Sh. 2, Rev. 14)MECHANICAL LAYOUTLBI-31511 LBI-3151116

Page 10 - LBI-31511 LBI-31511

(19D900980, Sh. 1, Rev. 4)INTERCONNECTION DIAGRAMLBI-31511 LBI-3151117

Page 11 - TRANSMITTER ALIGNMENT

TRANSMITTER ADJUSTMENTThe adjustment for the transmitter includes measuring theforward and reflected power and adjusting the antenna length foroptimum

Page 12

• To replace TRS board:1. Perform above procedures in reverse order.• To remove the PA board:1. Remove the three retaining screws (G) securing thePA f

Page 13 - RECEIVER ALIGNMENT

MICROCOMPUTER SOFTWARE (U705)The latest software package is a 19A703244P23 or a19A703868G5; replacing the following packages: Narrowband Wideband19A70

Page 14

TROUBLESHOOTING PROCEDURESIGNAL INDICATION VOLTAGE LEVELCASRUSSq Dis, InputCCT Sq Dis, InputTX EnablePTT, InputHigh LevelLow LevelHigh Level (RX Un-sq

Page 15

TROUBLESHOOTING PROCEDURENOTERegulated +5 Vdc and +9 Vdc can be opened by P701 thru P705 to facilitate troubleshooting.POWER AMPL METERING J1PA JACK R

Page 16 - MECHANICAL LAYOUT

TEST PROCEDUREThese Test Procedures are designed to help you to servicea receiver that is operating -- but not properly. The problemsencountered could

Page 17

TRANSMITTER ALIGNMENTBefore bench testing the radio, be sure or the output voltage characteristics of your bench power supply.To protect the transmitt

Page 18 - INTERCONNECTION DIAGRAM

TRANSMITTER FREQUENCYADJUSTMENTFirst check the frequency to determine if any adjustmentis required. The frequency should be set with a frequencymeter

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