IC-FR3000_IC-FR3100_serv.pdf

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1、VHF FM REPEATER iC-fr3000 iC-fr3100 INTRODUCTION This service manual describes the latest service informa- tion for the IC-FR3000/IC-FR3100 VHF FM REPEATER. To upgrade quality, all electrical or mechanical parts and internal circuits are subject to change without notice or obligation. DANGER USE ONL

2、Y the specified AC voltage described on the AC power socket. Other voltages may causes repeater damage or personal injury. DO NOT expose the repeater to rain, snow or any liquids. DO NOT reverse the polarities of the power supply when connecting the repeater. DO NOT apply an RF signal of more than 2

3、0 dBm (100 mW) to the antenna connector. This could damage the repeaters front end. ORDERING PARTS Be sure to include the following four points when ordering replacement parts: 1. 10-digit order numbers 2. Component part number and name 3. Equipment model name and unit name 4. Quantity required 1110

4、003780 S.IC NJM2902V IC-FR3000 LOGIC UNIT 1 piece 8930056450 2368 6-keyIC-FR3000 CHASSIS5 pieces Addresses are provided on the inside back cover for your convenience. REPAIR NOTES Make sure a problem is internal before disassembling the repeater. DO NOT open the repeater until the repeater is discon

5、- nected from its power source. DO NOT force any of the variable components. Turn them slowly and smoothly. DO NOT short any circuits or electronic parts. An insu- lated tuning tool MUST be used for all adjustments. DO NOT keep power ON for a long time when the re- peater is defective. DO NOT transm

6、it power into a signal generator or a sweep generator. ALWAYS connect a 40 dB or 50 dB attenuator be- tween the repeater and a deviation meter or spectrum analyser when using such test equipment. READ the instructions of test equipment thoroughly before connecting equipment to the repeater. 1. 2. 3.

7、 4. 5. 6. 7. 8. VersionModel Europe U.S.A. Germany Symbol Frequency rangeAC supply USA FRG2 Power 50 W100 120 V 150 174 MHz 150 174 MHz 148 172 MHz IC-FR3000 IC-FR3100 GEN2 220 240 V GeneralGEN4 GEN74 50 W 220 240 V EUR2 25 W TABLE OF CONTENTS SECTION 1 SPECIFICATIONS SECTION 2INSIDE VIEWS SECTION 3

8、CIRCUIT DESCRIPTION 3 - 1 RECEIVER CIRCUITS . 3 - 1 3 - 2 TRANSMITTER CIRCUITS . 3 - 2 3 - 3 PLL CIRCUITS. 3 - 4 3 - 4 OTHER CIRCUITS. 3 - 5 3 - 5 POWER SUPPLY CIRCUITS . 3 - 5 3 - 6 PORT ALLOCATIONS . 3 - 6 SECTION 4ADJUSTMENT PROCEDURES 4 - 1 PREPARATION. 4 - 1 4 - 2 PLL ADJUSTMENT. 4 - 5 4 - 3 SO

9、FTWARE ADJUSTMENT . 4 - 6 SECTION 5PARTS LIST SECTION 6OPTION UNIT INSTALLATION SECTION 7 MECHANICAL PARTS AND DISASSEMBLY SECTION 8SEMI-CONDUCTOR INFORMATION SECTION 9 BOARD LAYOUTS 9 - 1FRONT UNIT. 9 - 1 9 - 2VR UNIT. 9 - 1 9 - 3TVCO UNIT. 9 - 1 9 - 4 RVCO UNIT. 9 - 1 9 - 5 LOGIC UNIT. 9 - 3 9 - 6

10、RX UNIT. 9 - 5 9 - 7 TX UNIT . 9 - 7 9 - 8 PA UNIT. 9 - 9 9 - 9REG UNIT . 9 - 11 9 - 10JACK1 UNIT. 9 - 11 9 - 11JACK2 UNIT. 9 - 11 SECTION 10 BLOCK DIAGRAM SECTION 11 WIRING DIAGRAM SECTION 12VOLTAGE DIAGRAM Measurement method Frequency range Type of emission Channel spacing Frequency stability Numb

11、er of channels Antenna connector Power supply requirement Current drain (approx.) Operating temperature range Dimensions (proj. not included) Weight (approx.) RF output power (High/Low) Modulation system Maximum frequency deviation Spurious emissions Adjacent channel power Input impedance Receive sy

12、stem Intermediate frequencies Sensitivity (typical) Adjacent channel selectivity (typical) Spurious response Intermodulation (typical) Audio output power Audio output impedance IC-FR3000IC-FR3100 SECTION 1 SPECIFICATIONS 1 - 1 All stated specifications are subject to change without notice or obligat

13、ion. RECEIVERTRANSMITTERGENERAL EIA / TIA-603 ETS 300 086 USA2, GEN2, GEN4, GEN74, EUR2, FRG2: 150.000174.000 MHz GEN74: 148.000172.000 MHz Wide (25 kHz): 16K0F3E Middle (20 kHz): 14K0F3E Narrow (12.5 kHz): 8K50F3E USA2, GEN2, GEN4, GEN74, EUR2: 25/12.5 kHz FRG2: 20/12.5 kHz 2.5 ppm1.0 kHz Max. 32 c

14、hannel Type-N 2 (50 ) USA2, GEN2: 100120 V GEN4, GEN74, EUR2, FRG2: 220240 V 13.6 V DC (negative ground)13.2 V DC (negative ground) TX (at 50 W) 15.0 ATX (at 25 W) 10.0 A RX (max. audio) 2 A (stand-by)1 A 30C to +60C (22F to +140F)25C to +55C 410(W) 110(H) 360(D) mm; 16.1 (W)4.3 (H) 14.1 (D) inch 12

15、 kg; 26.5 lb 50/10 W25/5 W Variable reactance frequency modulation Wide: 5.0 kHz, Middle: 4.0 kHz, Narrow: 2.5 kHz 70 dBc typical0.25 W 1GHz, 1.0 W 1 GHz Wide, Middle: 70 dB, Narrow: 60 dB 600 Double-conversion superheterodyne system 1st: 31.65 MHz, 2nd: 455 kHz 0.5 V at 12 dB SINAD6 dBV (emf) at 20

16、 dB SINAD Wide, Middle: 70 dB, Narrow: 60 dB 70 dB 70 dB 2.5 W typical at 10% distortion with a 4 load 4 AC DC TX RX 2 - 1 JACK1 unit* FRONT unit JACK2 unit* TX unit RX unit PA unit REG unit LOGIC unit* SECTION 2INSIDE VIEWS BOARD LAYOUT *: Located under side of this point. PA UNIT Top view Pre-driv

17、e (Q4: 2SK3475) APC CTRL (IC1: TA75S01F Q9: DTC143ZU Q10: DTC114EU) +9 V switch (Q7: DTC114EU Q8: 2SA1362) +5 V regulator (IC7: TA78L05) Power amplifier (IC2:S-AV32 50 W type S-AV33 25 W type) 2 - 2 LOGIC UNIT Top view Bottom view Splatter filter (IC4: NJM2902V) CTCSS decoder (IC29: FX805LG) D/A con

18、verter (IC25: M62364) Mic mix amplifier (IC2: NJM2902V) Mic amplifier (IC1: NJM2902V) AF amplifier (IC17: LA4425A) Mic mute (IC13: BU4066) LED current CTRL (Q18, Q19, Q20: XP1114) Temperature switching circuit (IC32: TC4W53) MIC amplifier, Limitter (IC3: NJM2902V) ON-HOOK signal output (IC45: LM567M

19、) High-pass filter, De-emphasis circuts (IC9: NJM2902V) RESET (IC34: S-80842C) CPU (IC33: HD64F2238BF) Ringer detect circuit (IC48: TLP121) EEPROM (IC37: HN58X2464TI) DTMF decoder (IC30: TC4W53FU, IC31: LC7387M) 2 - 3 TX UNIT Top view *: Located under side of this point. RX UNIT Top view *: Located

20、under side of this point. PLL reference oscillator 12.8 MHz (X1: CR-759) PLL IC* (IC2: MB1511PFV) TX VCO circuit Mixer (IC6: NJM2107F) D/A converter* (IC5: M62364FP) RF amplifier (Q1: 2SC5337) PLL IC* (IC4: MB1511PFV) RX VCO circuit IF amplifier (Q3: 2SK1771) 2nd Lo oscillator 31.195 MHz (X2: CR-757

21、) IF IC (IC2: TA31136FN) Noise amplifier (IC8: NJM2902V) Reference oscillator 12.8 MHz (X3: CR-732) 1st Mixer (IC1: GN2011) Lo amplifier* (Q8: 2SC4226, Q9: 2SC4703) SECTION 3CIRCUIT DESCRIPTION 3 - 1 3-1 RECEIVER CIRCUITS 3-1-1 RF CIRCUIT (RXUNIT) Received signals from the RX antenna connector enter

22、 the RX unit J1 and pass through a tuned bandpass filter (D3, D4, L2, L3, C5C8, C12, C13, C205, C206, C220, 221) which is controlled by the D/A converter IC (LOGIC unit; IC25). The filtered signals are applied to an RF amplifier (Q1). The amplified signals are applied to a bandpass filter (L6, L7, L

23、12, L13, C9C11, C14, C15, C21, C22, C24, C30, C207, C208), and are then applied to the 1st mixer circuit. 3-1-2 1ST MIXER AND 1ST IF CIRCUITS (RX UNIT) The 1st mixer circuit converts the received signals to a fixed frequency of the 1st IF signal with the PLL output frequency. By changing the PLL fre

24、quency, only the desired frequency will pass through a crystal filter at the next stage of the 1st mixer. The filtered signals are applied to the 1st mixer circuit (L8, L9, L10, IC1) and are then mixed with the 1st LO signal from the PLL circuit to produce a 31.65 MHz 1st IF signal. The 1st IF signa

25、l passes through a MCF (Monolithic Crystal Filter; FI1) to suppress out-of-band signals. The filtered sig- nal is applied to the 2nd mixer circuit (IC2, pin 16) via the buffer amplifier (Q3). 3-1-3 2ND IF AND DEMODULATOR CIRCUITS (RX UNIT) The 2nd mixer circuit converts the 1st IF signal to a 2nd IF

26、 signal. A double-conversion superheterodyne system improves the image rejection ratio and obtains stable receiv- er gain. The amplified signal is applied to the 2nd mixer section of the FM IF IC (IC2, pin 16), and is then mixed with the 2nd LO signal for conversion to a 455 kHz 2nd IF signal. IC2 c

27、ontains the 2nd mixer, limiter amplifier, quadrature detector, active filter and noise amplifier circuits, etc. The local oscillator section and X2 generate 31.195 MHz for the 2nd LO signal. The 455 kHz 2nd IF signal is applied to a ceramic bandpass filter (narrow; FI5, wide; FI6) where unwanted sig

28、nals are suppressed and are then applied to a limiter amplifier sec- tion in the system IC (IC2, pin 5). The 2nd LO signal is then amplified at the limiter amplifier section (IC2, pin 5) and applied to the quadrature detector section (IC2, pins 10, 11 and X1) to demodulate the 2nd IF signal into AF

29、signals. The AF signals are output from pin 9 (IC2) and are then applied to the AF amplifier circuit on the LOGIC unit. 3-1-5 AF AMPLIFIER CIRCUIT (LOGIC UNIT) The AF amplifier circuit amplifies the demodulated AF sig- nals to drive a speaker. The AF signals from the FM IF IC (RX unit; IC2, pin 9) a

30、re applied to a buffer amplifier (IC9, pins 8, 9). The amplified signals pass through the high-pass filter (IC9, pins 5, 7, 12, 14) which removes CTCSS or DTCS signals. The filtered AF signals are output from pin 7 (IC9), and are applied to the de-emphasis circuit (IC9, pins 1, 2) with fre- quency c

31、haracteristics of 6 dB/octave, and then passed through a low-pass filter (IC10, pins 1, 3, 5, 7). The filtered signal is applied to a volume control (VR unit; R1) to control the audio level. IC2 contains the 2nd mixer, limiter amplifier, quadrature detector, active filter and noise amplifier circuit

32、s, etc. The local oscillator section and X2 generate 31.195 MHz for the 2nd LO signal. The output AF signals from a volume control (VR unit; R1) pass through the analog switch IC (IC16, pins 1, 7), and are then applied to the AF power amplifier (IC17, pins 1, 4) to drive a speaker. 2ND IF AND DEMODU

33、LATOR CIRCUITS (RX UNIT) FI5 2nd IF filter 455 kHz IF amp. QUAD. detector Active filter DISC signal to LOGIC unit J1 X1 RSSI 2nd Mixer X2 1st IF from the IF amplifier (Q3) RSSI signal to the CPU 87531 161311109 IC2 TA31136FN Noise comp. Noise amp. 12 FI6 N-DET to the CPU SQL signal to the LOGIC unit

34、 J1 NARROW WIDE 3 - 2 3-1-6 RECEIVER MUTE CIRCUITS (LOGIC UNIT) NOISE SQUELCH The noise squelch circuit cuts out AF signals when no RF signals are received. By detecting noise components in the AF signals, the squelch circuit switches the AF mute switch. Some noise components in the AF signals from

35、the FM IF IC (RX unit; IC2, pin 9) are passed through the SQL level con- troller (VR unit; R2). The level controlled signals are applied to the active filter section in the FM IF IC (RX unit; IC2, pin 8). Noise components about 10 kHz are amplified and out- put from pin 7 (RX unit; IC2). The filtere

36、d signals are converted to the pulse-type signals at the noise detector section and output from pin 13 (RX unit; IC2). The NDET signal from the FM IF IC (RX unit; IC2) is applied to the CPU (IC33, pin 40). The CPU analyses the noise con- dition and controls the AF mute signal via “AFMUTE1” line (IC4

37、0, pin 4) to the AF mute switch (IC16, pin 5). TONE SIGNALS The tone squelch circuit detects AF signals and opens the squelch only when receiving a signal containing a matching subaudible tone (CTCSS or DTCS). The CTCSS signal passes through a low-pass filter circuit (IC8, pins 1, 3, 5, 7, 8, 10), a

38、nd is then applied to the signal amplifier (IC8, pins 13, 14). The amplified signal is applied to the CTCSS decoder IC (IC29, pin 16) and the detected sig- nal is applied to the CPU (IC 33) via the serial signal line. The DTCS signal passes through a low-pass filter circuit (IC12, pins 1, 3, 8, 10),

39、 and is then applied to the signal amplifier (IC12, pins 12, 14). the amplified signal is applied to the DTCS decoder which is inside the CPU (IC33, pin 52) via the “DTCSI” line. The 2/5TONE signals are passes through a low-pass filter circuit (IC12, pins 5, 7), and are then applied to the 2/5 TONE

40、decoder which is inside the CPU (IC33, pin 51) via “25TI” line. The DTMF signal is pass through the DTMF switch IC (IC30 pin 7), and is then applied to the DTMF decoder(IC31). The decoded signal is applied to the CPU (IC33, pins 82, 85, 86). The CPU analyzes the DTMF signal. The DTMF switch (IC30) s

41、elects the signal from telephone line or RX unit. 3-2 TRANSMITTER CIRCUITS 3-2-1 AF AMPLIFIER CIRCUIT (LOGIC UNIT) IN CASE OF THE AF SIGNALS FROM THE MIC JACK The AF signals from the MIC jack (FRONT unit; J7) are amplified at the AF amplifier (IC1). The amplified signals are mixed with the “E_MOD1”,

42、 “E_MOD2” and “TELAFO” sig- nals at IC2. The mixed signals pass though the high-pass fil- ter (IC2, pins 1, 2, 6, 7) via the pre-emphasis circuit (IC2, pins 8, 9). TONE SIGNALS CIRCUITS (LOGIC UNIT) DTMF SW LPF LPF LPF AMP AMP CTCSS DTCS 2/5TONE DTMF CTCSS DETECTOR DTMF DECODER CPU; IC33 DATA BUS DATA BUS DISC signal from RX unit To the AF amplifier AMP IC9 IC8 IC12 IC31 IC30 IC12 IC12 IC8 IC29 DTCSI 25TI AF AMPLIFIER CIRCUITS (LOGIC UNIT) AMP AMP AMP AMPSW-D SW-C S