Icom IC H21T service manual radio amateur radioamateur

This service manual describes the latest service information for the IC-H21T | =» VHF TRANSCEIVER at the time of publication. i NEVER connect the transceiver to an AC outlet or to a DC power supply that | | uses more than 16 V. This will ruin the transceiver. DO NOT expose the transceiver to rain, snow or any liquids. | DO NOT reverse the polarities of the power supply when connecting the À transceiver. fi DO NOT apply an RF signal of more than 20 dBm (100 mW) to the antenna al A connector. This could damage thé transceiver's front end. Me, ORDERING PARTS BTE al mij | | oe acm em | Be sure to include the following four points when ordering replacement parts: [i 1. 10-digit order numbers À 2. Component part number and name | em 3. Equipment model name and unit name | annem 4. Quantity required ¥ i <SAMPLE ORDER > | | | 1140002220 1G WPBS85G IC-H21T TPLL UNIT 5 pieces | 8810002310 Screw FH

--- TABLE DES MATIERES / CONTENTS --- TABLE OF CONTENTS SECTION 1 SPECIFICATIONS ........................................................ TOT SECTION 2 INSIDE VIEWS........................................................ 2—1—+2 SECTION 3 CIRCUIT DESCRIPTION............................................... 8—1—10 3-1 RECEIVER CIRCUITS .................ce....eeeeeccre..s....... 8—1 3-2 TRANSMITTER CIRCUITS.................................................... 8—3 3-3 PLLCIRCUITS..............eeeuc eee... 85 3-4 POWER SUPPLY CIRCUITS .................................................. 8—7 3-5 LOGIC CIRCUITS. .....................sss....e................ 8 —8 3-6 S-TONECIRCUITS. 0.00000 ccc cece cece cece eect tte 8 —9Q 3-7 OTHER CIRCUITS.................ic eee... 3—= 10 SECTION 4 MECHANICAL PARTS AND DISASSEMBLY............................ 4—1—2 SECTION 5 PARTS LIST .......................................................... 5—1—+9 SECTION 6 ADJUSTMENT PROCEDURES......................................... 6—1—6 6-1 PREPARATION BEFORE SERVICING. . ......................................... 6—1 6-2 PLL ADJUSTMENT... 6 —2 6-3 RECEIVER ADJUSTMENT..........,.....................................…