Icom IC-F27SR Service Manual
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Icom IC-F27SR Service Manual

Icom IC-F27SR Service Manual

Pmr446 transceiver
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PMR446 TRANSCEIVER
S-14809XZ-C1
Oct. 2011

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Summary of Contents for Icom IC-F27SR

  • Page 1 PMR446 TRANSCEIVER S-14809XZ-C1 Oct. 2011...

  • Page 2: Ordering Parts

    8. READ the instructions of the test equipment throughly before connecting it to the transceiver. Icom, Icom Inc. and the Icom logo are registered trademarks of Icom Incorporated (Japan) in Japan, the United States, the United Kingdom, Germany, France, Spain, Russia and/or other countries.
  • Page 3 TABLE OF CONTENTS SECTION SPECIFICATIONS SECTION INSIDE VIEWS SECTION DISASSEMBLY INSTRUCTION SECTION CIRCUIT DESCRIPITON RECEIVER CIRCUITS............4-1 TRANSMITTER CIRCUITS .

  • Page 4: Specifications

    400 mA (approximately) RX Max. audio 330 mA (approximately) • Power supply requirement : 7.2 V DC nominal* (negative ground) *Only specifi ed Icom’s battery pack • Frequency stability : ±2.5 ppm (–25°C to +55°C) : 50 Ω nominal • Antenna impedance •...

  • Page 5: Inside Views

    SECTION 2. INSIDE VIEWS • MAIN-D UNIT (TOP VIEW) +5V LINE REGULATOR (Q75) +5V LINE REGULATOR (Q76) CPU5 LINE REGULATOR (IC54) APC AMP (IC1) TCXO PLL IC (X2) (IC2) 2ND IF BPF (FI2) 2ND IF BPF (For narrow mode only) (FI3) MIC GAIN CONTROLLER (IC62)
  • Page 6 • MAIN-D UNIT (BOTTOM VIEW) +5V LINE REGULATOR (Q74) AF AMP (IC55) TUNED BPF (D24, D26) POWER CTRL RF AMP (Q63) (Q22) AGC CTRL (Q21) POWER AMP (Q1) XTAL BPF (FI1) DRIVE AMP (Q2) 1ST IF MIXER PRE-DRIVE AMP (Q23) (Q3) IF DEMODULATOR IC PRE-AMP...

  • Page 7: Disassembly Instruction

    SECTION 3. DISASSEMBLY INSTRUCTION 1. REMOVING THE CHASSIS 2. REMOVING THE MAIN UNIT 1) Remove the antenna cap, antenna nut, top seal and 1) Remove the 9 screws and the side plate from the 2 knobs from the front panel. MAIN UNIT.

  • Page 8: Circuit Description

    SECTION 4. CIRCUIT DESCRIPTION 4-1 RECEIVER CIRCUITS 2ND IF CIRCUITS AND DEMODULATOR RF CIRCUITS The signal from the 1st IF circuits is applied to the IF The RX signal from the antenna is passed through the LPF demodulator IC which contains the 2nd IF mixer, 2nd IF and antenna SW, then filtered by the 2-staged tuned BPF AMP, FM detector, etc.

  • Page 9: Transmitter Circuits

    RX AF CIRCUITS 4-2 TRANSMITTER CIRCUITS The demodulated AF signal from the IF demodulator TX AF CIRCUITS IC is passed through the LPF, HPF which attenuates The audio signal from the internal or external microphone frequencies 300 Hz and below. The filtered AF signal is (MIC signal) is passed through the MIC gain SW and applied passed through the AF line SW, HPF which additionally to the MIC AMP.

  • Page 10: Frequency Synthesizer Circuits

    TX AMPLIFIERS 4-3 FREQUENCY SYNTHESIZER CIRCUITS The buffer amplified signal from the LO SW (D5) is amplified The RX VCO is composed of Q13, D11 and D12. The VCO by; the pre-AMP, pre-drive AMP, drive AMP, and power AMP output signal is buffer-amplified by two buffers and applied in sequence, to obtain TX power.

  • Page 11: Port Allocations

    4-5 PORT ALLOCATIONS • CPU (IC51) LINE LINE DESCRIPTION DESCRIPTION NAME NAME Tone signal (CTCSS/DTCS) A/D conversion select. CDEC ADSW H=RSSI input, L=BATV input decoding input. Noise level detect. Tone signal (5/2 TONE, DTMF, STONE NOIS BIIS) decoding/encoding . H=Squelch close Clock frequency shift.

  • Page 12: Parts List

    SECTION 5. PARTS LIST [MAIN-D UNIT] [MAIN-D UNIT] PARTS PARTS DESCRIPTION DESCRIPTION LOCATION LOCATION 1110002751 S.IC TA75S01F(TE85RF) 32.5/8.8 6200013010 S.COI 0.30-0.9-5TL 10.3N <COMO> 12.7/13.4 1140005991 S.IC MB15A02PFV1-G-BND-ERE1 42.9/24.7 6200002851 S.COI NLV25T-R82J 18.2/16.6 1110007320 S.IC NJM2591V-TE1-#ZZZB 45.8/38.9 6200012610 S.COI 0.40-0.9-2TL 2.8N <COMO> 18.2/13.4 IC51 1140015230 S.IC...
  • Page 13 [MAIN-D UNIT] [MAIN-D UNIT] PARTS PARTS DESCRIPTION DESCRIPTION LOCATION LOCATION R109 7030005530 S.RES ERJ2GEJ 100 X (10) 21.2/31.0 R386 7030005060 S.RES ERJ2GEJ 333 X (33K) 73.6/13.8 R110 7030004980 S.RES ERJ2GEJ 101 X (100) 22.1/25.4 R387 7030005030 S.RES ERJ2GEJ 152 X (1.5K) 73.6/15.6 R112 7030004970 S.RES ERJ2GEJ 470 X (47)
  • Page 14 [MAIN-D UNIT] [MAIN-D UNIT] PARTS PARTS DESCRIPTION DESCRIPTION LOCATION LOCATION 4030017720 S.CER C1005 JB 1H 331K-T 33.2/9.1 C210 4030017380 S.CER C1005 CH 1H 050B-T 35.4/25.1 4030017570 S.CER C1005 CH 1H 040B-T 39.1/14.2 C212 4030017460 S.CER C1005 JB 1H 102K-T 34.4/23.5 4030017460 S.CER C1005 JB 1H 102K-T 41.0/8.9 C213...
  • Page 15 [MAIN-D UNIT] PARTS DESCRIPTION LOCATION C381 4030016960 S.CER C1005 JB 1E 183K-T 68.4/8.0 C382 4030016960 S.CER C1005 JB 1E 183K-T 68.4/6.3 C383 4030017730 S.CER C1005 JB 1H 471K-T 70.2/4.6 C385 4030016930 S.CER C1005 JB 1A 104K-T 71.7/4.1 C388 4030017460 S.CER C1005 JB 1H 102K-T 20.9/3.5 C389 4030017460 S.CER C1005 JB 1H 102K-T...

  • Page 16: Mechanical Parts

    SECTION 6. MECHANICAL PARTS [ACCESSORIES] [CHASSIS PARTS] ORDER ORDER DESCRIPTION QTY. DESCRIPTION QTY. (Optional) BP-264 EXP [EUR-22] 2510001560 045P01202-02 (Optional) BP-265 EU [EUR-23] (Optional) BP-264 EXP [UK-02] 8900009640 OPC-963 (Optional) BP-265 EU [UK-03] 0880002840 EX-3289 #02 BC-192 EXP [EUR-22] 3310003640 2927 ANT <EIK> 0880002870 EX-3290 #02 BC-193 EX [EUR-23] 0880002840 EX-3289 #02 BC-192 EXP...
  • Page 17 MP23(C) MP20×2(C) MP1(C) MP19(C) ANT PCB MP31×2(C) MP16(C) MP18(C) MP22(C) MP33(C) MAIN UNIT S51(M) MP31×2(C) S54(M) MP17(C) MP36(C) R421(M) MP32(C) EP2(C) J52(M) MC51(M) MP2(M) J51(M) MP13(C) MP34×2(C) MP27(C) MP25(C) MP6(M) MP21(C) MP35(C) MP11(C) MP32(C) MP12(C) MP34×2(C) SP1(C) W1(C) MP15(C) MP14(C) MP10(C) MP2(C) UNIT ABBREVIATIONS...

  • Page 18: Board Layouts

    SECTION 7. BOARD LAYOUTS The combination of this page and next page shows the top side and bottom side of actual P.C. board. Int. SP • MAIN-D UNIT (TOP VIEW) [SPEAKER MICROPHONE JACK] CPU5- C419 C458 C413 C412 IC61 C239 R424 C232 C408...
  • Page 19 The combination of this page and next page shows the top side and bottom side of actual P.C. board. • MAIN-D UNIT (BOTTOM VIEW) R472 C334 R474 C391 R408 R473 C448 R406 R471 IC53 R128 C226 R146 C236 [VOLUME CONTROL] R456 C235 R147...

  • Page 20: Block Diagram

    SECTION 8. BLOCK DIAGRAM MAIN-D UNIT 446.00625-446.09375 MHz 2SK880 2SC4116 Q11:LDTC144EE RIPPLE LVIN BUFF HVD376B RX VCO Q13:2SC4226 15.3MHz D12:HVD350B IC60 D5:HVD142A D3:HVD142A RD07MUS2B NJM12902 CR-794 2SC5107 2SC5107 D6:HVD142A 2SC5107 2SC3356 RD01MUS1 D22:HVD142A VCON LOOP TX/RX DRIVE BUFF TCXO BUFF BUFF DRIVE HVD376B...

  • Page 21: Voltage Diagram

    SECTION 9. VOLTAGE DIAGRAM • MAIN-D UNIT (1/2) R303 IC60 R301 R302 C301 DISC 1.5k SDEC R304 NJM12902V VREF C TCSS/DTCS FILTER R314 IC57 R2A20178 R396 C365 R313 390k C304 270k 3.3k R397 C307 R321 VOUT3 VOUT2 180k R310 R311 R312 VOUT4 VOUT1...
  • Page 22 • MAIN-D UNIT (2/2) 7.5V TX 5.0V 5.0V ANT_BOARD RX 0V 4.26V VCOV TX 0.72V MMZ1005Y102C T 2SC4116 TX 0.64V RX VCO TX 1.6V M PZ2012S331A 0.47U 6 .8k 6.8k RX 0V HVD376B 0.76V 10.3N 2SC4226 0.001 0.001 MMZ1005A152ET 13.6N 13.6N 2.8N 2.8N...
  • Page 23 Highway 17 Delta, B.C., V4K 5B8, Canada : http://www.icomspain.com Phone : +1 (604) 952-4266 Fax : +1 (604) 952-0090 E-mail : icom@icomspain.com : http://www.icomcanada.com E-mail : info@icomcanada.com Blacksole House, The Boulevard, Altira Business Park, Herne Bay, CT6 6GZ, UK Phone : +44 (01227) 741741...
  • Page 24 S-14809XZ-C1 1-1-32, Kamiminami, Hirano-ku, Osaka 547-0003, Japan © 2011 Icom Inc.

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