IC706MKIIG.pdf

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1、 KB2LJJ Radio Mods Database and Manuals Please read this information, so youll know how to help me, and make this site better. If you have any new modifications that are not listed on this site, please mail the modification to me. Any technical information like manuals, service notes, service manual

2、, diagrams or other stuff, I will be very happy if you will send it to me. If the information is on paper and you have access to a scanner or camera, then scan or photograph the information and send the picture to me. I have a good connection to the internet, so the size is no problem. KB2LJJ Privac

3、y Guarantee I will not give any guaranty on the radio modification. Remember it is Illegal to transmit out of band. The Radio Modification is for Informational purposes ONLY. Doing such modifications on your radio may void any warranty and damage your equipment. All mods found on this database are o

4、ffered by other amateur radio hams or captured by the Packet system. KB2LJJ takes no responsibility or liability for any damage done resulting from any modification. For more information please email to Page 1 SERVICE MANUAL HF/VHF/UHF ALL MODE TRANSCEIVER i706MKG IC-706MK2G 99.3.11 7:31 PM Page 1 I

5、NTRODUCTION This service manual describes the latest service information for the IC-706MKIIG HF/VHF/UHF ALL MODE TRANS- CEIVER at the time of publication. To upgrade quality, any electrical or mechanical parts and internal circuits are subject to change without notice or obligation. DANGER NEVER con

6、nect 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 con- necting the transceiver. DO NOT apply an RF signal of more th

7、an 20 dBm (100 mW) to the antenna connector.This could damage the trans- ceivers 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 requi

8、red 1110004080 S.ICPC2709TIC-706MKIIG MAIN UNIT 05 pieces 8810009020 Screw FH M2.6 x 5 ZK IC-706MKIIG Top cover10 pieces Addresses are provided on the inside back cover for your convenience. REPAIR NOTES 1. Make sure a problem is internal before disassembling the transceiver. 2. DO NOT open the tran

9、sceiver until the transceiver is disconnected from its power source. 3. DO NOT force any of the variable components.Turn them slowly and smoothly. 4. DO NOT short any circuits or electronic parts. An insu- lated tuning tool MUST be used for all adjustments. 5. DO NOT keep power ON for a long time wh

10、en the trans- ceiver is defective. 6. DO NOT transmit power into a signal generator or a sweep generator. 7. ALWAYS connect a 50 dB to 60 dB attenuator between the transceiver and a deviation meter or spectrum ana- lyzer when using such test equipment. 8. READ the instructions of test equipment thor

11、oughly before connecting equipment to the transceiver. VERSION NO. #02, #12 #03, #13 #04, #14 #05, #15 #08, #18 VERSION Europe France Spain U.S.A. Other SYMBOL EUR FRA ESP USA OTH TABLE OF CONTENTS SECTION 1SPECIFICATIONS SECTION 2INSIDE VIEWS SECTION 3CIRCUIT DESCRIPTION 3 - 1 RECEIVER CIRCUITS. 3

12、- 1 3 - 2 TRANSMITTER CIRCUITS. 3 - 4 3 - 3 PLL CIRCUITS. 3 - 6 3 - 4 LOGIC CIRCUITS. 3 - 8 SECTION 4ADJUSTMENT PROCEDURES 4 - 1 PREPARATION BEFORE SERVICING . 4 - 1 4 - 2 PLL ADJUSTMENTS. 4 - 2 4 - 3 TRANSMITTER ADJUSTMENTS . 4 - 2 4 - 4 RECEIVER ADJUSTMENTS. 4 - 8 4 - 5 SET MODE ADJUSTMENT. 4 - 10

13、 SECTION 5PARTS LIST SECTION 6MECHANICAL PARTS AND DISASSEMBLY SECTION 7SEMI-CONDUCTOR INFORMATION SECTION 8BOARD LAYOUTS 8 - 1 DISPLAY BOARD. 8 - 1 8 - 2 MAIN BOARD. 8 - 3 8 - 3 HPF AND DRIVER BOARD. 8 - 5 8 - 4 PA UNIT. 8 - 7 8 - 5 PLL UNIT. 8 - 9 8 - 6 FILTER BOARD. 8 - 11 SECTION 9BLOCK DIAGRAM

14、SECTION 10VOLTAGE DIAGRAM I GENERAL Frequency coverage: Receive0.030 200.000 MHz* 430.000 470.000 MHz* Transmit1.800 1.999 MHz* 3.500 3.999 MHz* 7.000 7.300 MHz* 10.100 10.150 MHz 14.000 14.350 MHz 18.068 18.168 MHz 21.000 21.450 MHz 24.890 24.990 MHz 28.000 29.700 MHz 50.000 54.000 MHz* 144.000 148

15、.000 MHz* 430.000 450.000 MHz* *Depending on version. Mode : USB, LSB, CW, RTTY (FSK), AM, FM, WFM (WFM is for receiver only) Number of memory ch.: 107 (99 regular, 6 scan edges,1 call) Antenna connector: SO-239 2 (for HF/50 MHz and 144/440 MHz)/50 Power supply requirement : 13.8 V DC 15% (negative

16、ground) Frequency stability: Less than 7 ppm from 1 min. to 60 min. after power ON. After that, rate of stability less than 1 ppm/hr. at +25C (+77F). Temperature fluctuations 0C to +50C (+32F to +122F) less than 5 ppm. Current consumption: Transmitmax. power20 A Receivestandby1.8 A max. audio2.0 A U

17、sable temperature range : 10C to +60C (+14F to +140F) Dimensions: 167(W) 58(H) 200(D) mm (projections not included)6916(W) 2932(H) 778(D) inch Weight: 2.45 kg (5 lb 6 oz) CI-V connector: 2-conductor 3.5 (d) mm (1/8)/8 ACC connector: 13-pin I TRANSMITTER Output power: 1.850 MHz bandSSB/CW/RTTY/FM 510

18、0 W AM240 W 144 MHz bandSSB/CW/RTTY/FM 550 W AM220 W 440 MHz bandSSB/CW/RTTY/FM 220 W AM28 W Modulation system: SSBBalanced modulation AMLow level modulation FMVariable reactance modulation Spurious emissions: Below 47.5 MHzLess than 50 dB (typical) Above 47.5 MHzLess than 60 dB Carrier suppression:

19、 More than 40 dB Unwanted sideband supp. : More than 50 dB Microphone connector: 8-pin modular jack (600 ) KEY connector: 3-conductor 6.35 (d) mm (1/4) RTTY connector: 3-conductor 3.5 (d) mm (1/8) I RECEIVER Receive system: SSB/CW/AM/WFMDouble superheterodyne FMTriple superheterodyne Intermediate fr

20、equencies: *FM or FM-N mode only Receive sensitivity :(pre-amp ON) Note: SSB, CW and AM modes are measured at 10 dB S/N; FM mode at 12 dB SINAD. *Except 44.5 MHz, 89 MHz. Squelch Sensitivity : (pre-amp ON) SSBLess than 5.6 V FMLess than 0.32 V Selectivity*: SSB, CW, RTTYMore than 2.4 kHz/6 dB Less t

21、han 4.8 kHz/60 dB AM/FM-NMore than 8.0 kHz/6 dB Less than 30 kHz/40 dB FMMore than 12 kHz/6 dB Less than 30 kHz/60 dB *Without an optional filter unit and with mid bandwidth selected. Spurious and image rejection ratio: HF band70dB 50 MHz band65 dB (except IF through) 144/440 MHz band65 dB Audio out

22、put power : More than 2.0 W at 10% distortion (at 13.8 V DC)with an 8 load RIT variable range: 9.99 kHz PHONES connector: 3-conductor 3.5 (d) mm (1/8)/8 EXT SP connector: 2-conductor 3.5 (d) mm (1/8)/8 3rd IF 455 kHz* 455 kHz* MODE SSB/AM-N/FM AM/FM-N CW RTTY WFM 1st IF 69.0115 MHz 69.0100 MHz 69.01

23、06 MHz 69.0105 MHz 70.7000 MHz 2nd IF 9.0115 MHz 9.0100 MHz 9.0106 MHz 9.0105 MHz 10.7000 MHz 1 - 1 SECTION 1SPECIFICATIONS FM 0.5 V 0.25 V 0.18 V 0.18 V FREQUENCY 0.5 1.8 MHz 1.8 28 MHz* 28 29.999 MHz 50 MHz band 144 MHz band 440 MHz band SSB/CW/RTTY 0.16 V 0.16 V 0.13 V 0.11 V 0.11 V AM 13 V 2 V 2

24、 V 1 V 1 V 1 V All stated specifications are subject to change without notice or obligation. Predrive amplifier (Q101: 2SK2854) HPF board D/A converter (IC2201: M62352GP) ?PA AND PLL UNITS FILTER board MAIN CPU clock (X2161: CR-636) MAIN CPU * (IC 2001: HD6433337YA56F) MAIN board 3rd IF filter for F

25、M * (FI791: SFPC455E-TC01) MIC amplifier (IC931: PC5023GS-077-E1) AF selector switch * (IC861: BU4052BCFV-E2) Tx FM PLL IC * (IC1011: LC7153M-TLM) Balanced modulator * (IC1041: NJM1496V) Discriminator (X791: CDB455CX24) FM IF IC * (IC791: TA31136FN) RX preamplifier (IC151: PC1658G) 1st mixer (D271:

26、HSB88WSTR) 1st IF filter (FI511: FI-261) 2nd mixer * (D551: HSB88WSTR) 2nd IF filter (FI561: FL-23) Space for optional filters FL-100, FL-101, FL-103 FL-233, FL-232 Power amplifers (Q171, Q172, Q231: SRFJ7044) DDS IC (IC101: SC-1246) BFO DDS IC (IC901: SC-1287) PLL IC * (IC461: LMX2306TMX) VCO1 * (Q

27、301: 2SK508) VCO2 * (Q331: 2SK508) PA unit DRIVER board Drive amplifers (Q161, Q211: MRF1508TI) Predrive amplifer (Q121: MXR9745) AF power amplifer (IC231: LA4425A) PLL unit AF volume controller (IC201: M5282FP) VCO3 * (Q361: 2SK508) Reference oscillator (X621: CR-275A 30.00000 MHz) *Located under s

28、ide of the point ?MAIN AND FILTER BOARDS 2 - 1 SECTION 2INSIDE VIEWS 3-1 RECEIVER CIRCUITS 3-1-1 HF/50 MHz RF CIRCUIT (FILTER, MAIN AND HPF BOARDS) HF/50 MHz RF filters pass only the desired band signals and suppress any undesired band signals. The HF/50 MHz RF circuit has 7 low-pass filters and 8 h

29、igh-pass filters for specified band use. HF/50 MHz RF signals from the ANT1 connector, pass through one of 7 low-pass filters as below, the transmit/ receive switching relay (FILTER board; RL1) and low-pass filter (FILTER board; L1, L2, C1C5), and are then applied to the MAIN board via J1 (FILTER bo

30、ard). The signals from the FILTER board are applied to or bypass the 20 dB attenuator (R122, R125, R126). The signals pass through the high-pass filter (L132, L133, C132C137) to suppress strong signals below 1.6 MHz and are then applied to the HPF board via the “SAF” terminal. (1) 0.032 MHz and 3040

31、 MHz The signals pass through a low-pass filter (L101, L102, C101C105), and then applied to the preamplifier circuit on the MAIN board. (2) 230 MHz The signals from the low-pass filter (L101, L102, C101C105) are applied to one of 6 high-pass filters as at right above and are then applied to the prea

32、mplifier circuit on the MAIN board. (3) 4060 MHz The signals pass through the low-pass filter (L172, L173, C172C176) and the high-pass filter (L174, L175, C177C181) via D171 and are then applied to the preampli- fier circuit on the MAIN board. 3-1-2 VHF AND UHF RF CIRCUITS (PA UNIT) The VHF and UHF

33、RF circuits pass and amplify only the desired band signals and suppresses any undesired band signals. The both RF circuits have a preamplifier and band- pass filters respectively. VHF RF CIRCUIT The VHF RF signals from the ANT2 connector pass through the low-pass filter (L263L265, C274C276) and ante

34、nna switching circuit (D291D293). The signals are applied to the bandpass filter (D403, D409, D408), and are then amplified at the preamplifier circuit (Q403). The ampli- fied signals are then applied to the another bandpass filter (D407, D406, D410). UHF RF CIRCUIT The UHF RF signals from the ANT2

35、connector pass through the high-pass filter (L316, L317, C326C327), low- pass filter (L313L315, C322C324) and antenna switching circuit (D341, D342, D343). The signals are amplified at the preamplifier circuit (Q453) between the 2 bandpass filters (D454, D453 and D454, D456). The filtered signals ar

36、e applied to the MAIN board via J481 (PA unit) and are then applied to the preamplifier circuit. D403, D408, D409, D406, D407, D410, D454, D453, D454 and D456 are varactor diodes that tune the ceinter frequen- cy of an RF passband for wide bandwidth receiving and good image response rejection. On th

37、e VHF band, receiving signals are above 129 MHz, the switching diodes (D404, D405) are turned off by the control signal “2MBL” from PLL unit, then the varactor diodes (D408, D407) are disconnect- ed. Used RF high-pass filter (HPF board) Used RF low-pass filter (FILTER board) 3 - 1 SECTION 3CIRCUIT D

38、ESCRIPTION RECEIVER CONSTRUCTION 1st LO: 69.0415 MHz 530.0115 MHz BPF LPFHPF 1st mixer D271 2nd LO: 60.0 MHz 2nd mixer D511 to AM demod. circuit (D761) to FM demod. circuit (IC791) ANT1 0.0360 MHz LPF ANT2 60470 MHz Crystal filter FI511 69.0115 MHz Crystal filter NB gate FI561 to WFM detector circui

39、t (IC631) to BFO circuit (IC1041) 9.0115MHz NB circuit FILTER BOARD PA UNIT HPF BOARD MAIN BOARD SSB, CW filter FI671 AM, FM-N filter FI681 Optional filter-1 Optional filter-2 amp. Pre-amp. IC151 Frequency (MHz) 0.032 MHz 24 MHz 48 MHz 815 MHz Frequency (MHz) 1522 MHz 2230 MHz 3060 MHz Control signa

40、l L5 L6 L7 Control signal L1 L2 L3 L4 Entrance coil RL15 RL13 RL5 RL9 Entrance coil RL11 RL7 RL3 Frequency (MHz) 0.032 MHz 24 MHz 48 MHz 815 MHz Frequency (MHz) 1522 MHz 2230 MHz 3040 MHz 4060 MHz Control signal L5H L6H THH B7H Control signal THH L2H L3H L4H Entrance coil D111 D121 D131 D141 Entranc

41、e coil D151 D161 D111 D171 3-1-3 PREAMPLIFIER CIRCUIT (MAIN BOARD) The preamplifier circuit in the IC-706MKIIG has approx. 15dB gain over a wide-band frequency range. When the preamplifier is turned ON, the signals from the RF circuit are applied to the preamplifier (IC151) via D2182. Amplified or b

42、ypassed signals are applied to the 1st mixer circuit (D271). 3-1-4 1ST MIXER CIRCUIT (MAIN BOARD) The 1st mixer circuit mixes the receive signals with the 1st LO signal to convert the receive signal frequencies to a 69 or 70.7 MHz 1st IF signal. The signals from the preamplifier circuit, or signals

43、which bypass the preamplifier, are passed through a low-pass fil- ter and then applied to the 1st mixer (D271). The 1st LO signals (69.0415539.0115 MHz) enter the MAIN board from the PLL unit via J281. The LO signal is amplified at IC281, filtered by a low- pass filter, and then, applied to the 1st mixer. 3-1-5 1ST IF CIRCUIT (MAIN BOARD)