Icom AT-141 Service Manual Download

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SECTION 1 SPECIFICATIONS

SECTION 2 INSIDE

VIEWS

SECTION 3 CIRCUIT

DESCRIPITON

3-1

RECEIVER

CIRCUITS

............................................................................................................. B-3-1

3-2

TRNSMITTER

CIRCUITS

........................................................................................................ B-3-1

3-3

POWER

SUPPLY

CIRCUITS

................................................................................................... B-3-1

3-4

OTHER

CIRCUITS

................................................................................................................... B-3-2

SECTION 4 ADJUSTMENT

PROCEDURES

SECTION 5 PARTS

LIST

SECTION 6

MECHANICAL PARTS AND DISASSEMBLY

SECTION 7 SEMI-CONDUCTOR

INFORMATION

SECTION 8 BOARD

LAYOUT

SECTION 9 BLOCK

DIAGRAM

SECTION 10 VOLTAGE

DIAGRAM

SERVICE MANUAL

HF AUTOMATIC ANTENNA TUNER

Summary of Contents for AT-141

Page 1: ...CIRCUITS B 3 1 3 3 POWER SUPPLY CIRCUITS B 3 1 3 4 OTHER CIRCUITS B 3 2 SECTION 4 ADJUSTMENT PROCEDURES SECTION 5 PARTS LIST SECTION 6 MECHANICAL PARTS AND DISASSEMBLY SECTION 7 SEMI CONDUCTOR INFORMATION SECTION 8 BOARD LAYOUT SECTION 9 BLOCK DIAGRAM SECTION 10 VOLTAGE DIAGRAM SERVICE MANUAL HF AUTOMATIC ANTENNA TUNER B ...

Page 2: ...atic tuning time Approx 2 to 3 sec max 15 sec Tuning accuracy VSWR Better than 2 0 1 after tuning except for multiples of 1 2 λ Power supply requirement 13 6 V DC 15 supplied from the transceiver Driving current Less than 2 A Usable temperature range 30 C to 60 C Dimensions projections not included 230 W 80 H 340 D mm Case construction Weatherproof Weight Approx 2 5 kg All stated specifications ar...

Page 3: ...l cable receptacle 5V regulator IC20 TA7805F CPU IC15 MB95F108AHSPFM LEDs DS1 DS23 SML 311UT Ground terminal Antenna terminal Antenna cable receptacle Attenuator Phase detector circuit Forward power detector circuit SWR detector circuit ...

Page 4: ...e transceiver is low enough to be handled by the attenuator within the tuner The RF power from the connected transceiver is detected at the power detector L1 and then convert into a DC voltage The converted voltage is applied to the CPU IC15 pin 62 and then analyzed input RF power C3 C2 D1 L1 R13 R8 R72 R9 To CPU IC15 pin 63 To RL2 INPUT FROM RL1 C4 C178 FORWARD POWER DETECTOR CIRCUIT L4 R30 R29 R...

Page 5: ...ransmit power to a very low level The low power minimizes the risk of interference to other stations while matching an antenna to the transmitter The VSWR at the input terminal is usually close to 1 1 even with a large change of impedance at the attenuator output due to the 16 dB of isolation between the input and the matching network The circuit uses the constant voltage at D7 and D8 as a ref ere...

Page 6: ...Control receptacle AT 141 CONNECTION 4 1 PREPARATION REQUIRED TEST EQUIPMENT EQUIPMENT GRADE AND RANGE DC power supply Output voltage Depended on connected transceiver Current capacity Depended on connected transceiver Oscilloscope Frequency range DC 20 MHz Measuring range 0 01 10 V ...

Page 7: ...the transceiver Connect an oscil loscope to CP81 5 V Set R194 at the point where the voltage just before drops to 0 V R194 IMPEDANCE DETECTOR CIRCUIT 5 Transmit the transceiver Connect an oscil loscope to CP83 5 V Set C7 at the point where the voltage just before drops to 0 V C7 NOTE After the adjustment remove the jumper wire between CP15 and ground After the adjustment disconnect short pin P6 fr...

Page 8: ...10002840 COL LA 468 L16 6110002850 COL LA 469 L17 6110002860 COL LA 470 L18 6200003261 S COL NLV32T 101J T 23 1 126 2 L20 6200008820 S COL HF70ACC 635050 T T 196 8 190 L22 6200008820 S COL HF70ACC 635050 T T 177 7 166 L24 6200003261 S COL NLV32T 101J T 167 6 167 7 L25 6200003261 S COL NLV32T 101J T 157 6 184 L28 6200003261 S COL NLV32T 101J T 25 3 69 L31 6200011610 S COL NLC453232T 100K PF T 238 8...

Page 9: ...650 S RES ERJ3GEYJ 563 V 56 k T 131 6 189 4 R200 7030003680 S RES ERJ3GEYJ 104 V 100 k T 24 9 173 3 R201 7030003440 S RES ERJ3GEYJ 102 V 1 k T 33 7 135 1 R202 7030003720 S RES ERJ3GEYJ 224 V 220 k T 46 4 126 9 R203 7030003640 S RES ERJ3GEYJ 473 V 47 k T 25 176 3 R204 7030003640 S RES ERJ3GEYJ 473 V 47 k T 23 1 178 5 R205 7410000352 ARY RGLD3X104J R206 7410000352 ARY RGLD3X104J R207 7410000352 ARY ...

Page 10: ...72K T T 76 6 174 C197 4030006880 S CER C1608 JB 1H 472K T T 76 6 141 8 C198 4030006880 S CER C1608 JB 1H 472K T T 76 6 144 1 C199 4030006880 S CER C1608 JB 1H 472K T T 76 6 146 4 C200 4030006880 S CER C1608 JB 1H 472K T T 76 6 148 7 C201 4030006880 S CER C1608 JB 1H 472K T T 76 6 151 C202 4030006880 S CER C1608 JB 1H 472K T T 76 6 153 3 C203 4030006880 S CER C1608 JB 1H 472K T T 76 6 155 6 C204 40...

Page 11: ...40002620 S LED SML 311UT T86 T 150 2 134 7 DS12 5040002620 S LED SML 311UT T86 T 148 4 131 6 DS13 5040002620 S LED SML 311UT T86 T 165 9 143 DS14 5040002620 S LED SML 311UT T86 T 164 3 146 9 DS15 5040002620 S LED SML 311UT T86 T 148 3 143 DS16 5040002620 S LED SML 311UT T86 T 150 1 146 9 DS17 5040002620 S LED SML 311UT T86 T 151 9 143 DS18 5040002620 S LED SML 311UT T86 T 153 6 146 9 DS19 50400026...

Page 12: ...asher M5 SUS 1 MP534 8830000370 Wing nut M5 SUS 1 MP535 8810002800 Screw PH M5 10 SUS 4 MP536 8810000660 Screw PH M4 14 SUS 10 MP537 8810001480 Screw PH A M5 10 SUS 2 MP538 8810001691 Screw PH B0 3 8 PL 9 MP539 8830000240 Nut M4 SUS 10 MP541 8930006570 Sealing washer D 1 MP544 8930006570 Sealing washer D 1 MP551 8950001980 Cable tie 140 1 MP552 6910014570 Super ground FGA13 08B 1 MP553 6910014570 ...

Page 13: ...P6 T MP553 C MP503 C MP551 C MP553 C W502 C MP530 C MP531 C MP532 C MP533 C MP534 C MP526 C MP525 C MP524 C MP523 C MP522 C MP541 C MP535 C MP509 C MP510 C MP504 C MP508 C MP539 C MP506 C MP537 C MP510 C MP520 C MP521 C MP519 C MP527 C MP529 C MP528 C MP506 C MP537 C A A B B C C Unit abbreviations C CHASSIS PARTS T TUNER 1 UNIT B 6 2 ...

Page 14: ...ORS AND FET S B E C B E C B E C 2SA1586 GR 2SC4116 GR DTC144EUA T106 Symbol SG Symbol LG Symbol 26_ DIODES C A1 A2 A C A C A2 A1 C2 C1 1SS301 HSB88WSTR HSM88AS TR MA2S111 MA732 MA862 Symbol B3 Symbol Silver line Symbol C1 Symbol A Symbol 2C Symbol M1I ...

Page 15: ...190 H195 H0 V5 V10 V15 V0 V25 V30 V35 V20 V45 V50 V55 V40 V65 V70 V75 V60 V80 V90 V95 V100 V85 V105 V110 V115 V125 V130 V135 V120 V145 V150 V155 V140 V165 V170 V175 V160 V180 V190 V195 V200 V185 V205 V210 V215 V225 V230 V235 V220 V245 V240 V250 V255 V265 V270 V275 V260 V280 V285 V290 V300 V295 to ground Terminal to antenna Terminal to CHASSIS W501 KEY STAR 13 6 ANTC to TRANSCEIVER CHASSIS W502 ...

Page 16: ...93S CPU Q7 2SA1586 CPU CTRL IC15 MB95F108AHSPFM BUFF LATCH LATCH IC2 IC3 BU4094BCFV 2 IC3 IC4 BU4094BCFV 2 C NETWORK 13 6V REG IC20 TA7805F 5V Q8 2SC4116 BUFF D1 MA732 FWD PWR DET D11 MA732 D7 D8 D11 D12 MA732 4 TRANSCEIVER P D Q2 2SC4116 IC5 TC74HC393F BUFF DIV SWR DET ATT SECTION 9 BLOCK DIAGRAM B 9 1 ...

Page 17: ...0 0047 C207 0 0047 C206 0 0047 C205 0 0047 C212 0 0047 C213 0 0047 C214 0 0047 C215 0 0047 C216 0 0047 C217 0 0047 C218 0 0047 C5 COUT C1 C2 C3 C4 C_OUT C_IN CO1 CO2 CO5 CO3 CO4 µPA2004GR IC13 SK O7 O6 O5 O4 O3 O2 O1 VSS I7 I2 I3 I4 I5 I6 9 10 11 12 13 14 15 16 8 7 6 1 2 5 4 3 I1 C261 0 0047 C260 0 0047 C259 0 0047 C258 0 0047 C257 0 0047 C256 0 0047 C266 0 0047 C267 0 0047 C268 0 0047 C269 0 0047...

Page 18: ...ood Centre 150 6165 Highway 17 Delta B C V4K 5B8 Canada Phone 1 604 952 4266 Fax 1 604 952 0090 URL http www icomcanada com E mail info icomcanada com Unit 1 103 Garden Road Clayton VIC 3168 Australia Phone 61 03 9549 7500 Fax 61 03 9549 7505 URL http www icom net au E mail sales icom net au 146A Harris Road East Tamaki Auckland New Zealand Phone 64 09 274 4062 Fax 64 09 274 4708 URL http www icom...

Page 19: ...1 1 32 Kamiminami Hirano ku Osaka 547 0003 Japan S 14232HZ C1 2006 Icom Inc ...

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