Icom IC-449A Émetteur-récepteur
Fabricant:
Modèle:
IC-449A
Date:
1991
Catégorie:
Groupe:
Description:
430 MHz FM TRANSCEIVER
manuel de réparation
Type manuel:
manuel de réparation
Pages:
47
Taille:
16.44 Mbytes (17233643 Bytes)
Langue:
english
Révision:
Manuel-ID:
Date:
Qualité:
Document scanné, tous les lisible.
Date de transfert:
2016 01 06
MD5:
8ab7cc17f37476e6b49a4a9689a75a08
Téléchargements:
1481

Information

This service manual describes the latest information for the following transceivers at the time of publication. SECTION 1 SPECIFICATIONS ... 1—1 SECTION 2 INSIDE VIEWS ... 2—1 SECTION 3 CIRCUIT DESCRIPTION ... 3-1-5 3-1 Receiver CIRCUITS ... 3—1 3-2 Transmitter CIRCUITS ... 3—2 3-3 PLL CIRCUITS ... 3—3 3-4 LOGIC CIRCUITS ... 3—3 3-5 OTHER CIRCUITS ... 3—5 SECTION 4 ADJUSTMENT PROCEDURES ... 4-1-4 4-1 PREPARATION BEFORE SERVICING ... 4—1 4-2 PLL ADJUSTMENT ... 4—2 4-3 Receiver ADJUSTMENT ... 4—3 4-4 Transmitter ADJUSTMENT ... 4—3 SECTION 5 MECHANICAL PARTS AND DISASSEMBLY ... 5-1-2 5-1 Transceiver ... 5—1 5-2 ACCESSORIES ... 5—1 SECTION 6 CONNECTOR ASSEMBLY ... 6—1 SECTION 7 PARTS LIST ... 7-1-7 SECTION 8 BOARD LAYOUTS ... 8-1-7 8-1 LOGIC UNIT ... 8—1 8-2 MAIN UNIT ... 8—2 8-3 PLL-A UNIT ... 8—4 8-4 IF UNIT ... 8—4 8-5 APC UNIT ... 8—4 8-6 VCO UNIT ... 8—5 8-7 MIC-AMP UNIT ... 8—5 8-8 YGR UNIT ... 8—6 8-9 A-BANDUNIT ... 8—6 8-10 UT-51 TONE ENCODER UNIT ... 8—7 SECTION 9 OPTION UNITS ... 9-1-2 9-1 UT-50 TONE SQUELCH UNIT ... 9—1 9-2 UT-55 DTMF ENCODER/DECODER UNIT ... 9—2 SECTION 10 VOLTAGE DIAGRAM ... 10—1 SECTION 11 BLOCK DIAGRAM ... 11—1

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