IC-730_serv.pdf

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1、. . HF ALL BAND TRANSCEIVER IC-73D MAINTENANCE MANUAL DIICOMI ICOM INCORPORATED 1-6-19. Kamikurazukuri Hirano-ku. Osaka. Japan Phone: (oo17931 Telex: ICOM TR J63649 ICOM a.oPE G.M.B.H. Himmelgeister Stress 100 4000 Duesseldorf 1 Weat Germany Phone:0211-346047 Telex:41-8688082 ICOM AMaleA, Ie. 2112 1

2、16th Mnue N.E. Bellevue. WA 90004 Phone:t2(6)454-8165 Telex:230-162210 !COM AMER BVUE 3331 TowelWOOd Dr . Suite 307 Dalla T_ 76234 Phone:1214)620-2781 ICOM CANADA LTD. 810 S.W. Marina Oriw VallCOUler. BC Canada Phone:I8(4)321-1833 Telex:21-464315 ICOM AUS1RALIA, PlY. Ltd. 7 Duke Street. Windsor 3181

3、 Victoria Australia Phone:(03)629-7582 Telex:71-35621 ICOMAS AA36621 for free by RadioAmateur.eu TABLE OF CONTENTS SECTION 1. SPECIFICATIONS . 1-1 SECTION 2. OPERATING CONTROLS . 2 - 1 - 4 SECTION 3. CIRCUIT DESCRIPTION . 3 - 1 - 8 SECTION SECTION SECTION SECTION SECTION SECTION 3 - 1 RECEIVING CIRC

4、UITS . . . . . . . . . . . . . . . . . . . . . . 3 - 1 3 -2 TRANSMITTING CIRCUITS. . . . . . . . . . . . . . 3 - 3 3 -31ST LOCAL OSCILLATOR CIRCUITS . 3-6 3 - 4 DISPLAY UNIT . 3-8 4. INSIDE VIEWS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 - 1 -4 5.

5、 BLOCK DIAGRAM . 5 - 1 6. OPTIONS INSTALLATION . 6 -1 - 9 7. MECHANICAL PARTS AND DISASSEMBLY . 7 - 1 -23 8. MAINTENANCE AND ADJUSTMENT. . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 -1 -19 8 - 1 MEASURING INSTRUMENTS REQUIRED FOR ADJUSTMENT 8-1 8 - 2 PLL ADJUSTMENT . , . . , . . . . . . .

6、 8 - 2 8 - 3 RECEIVER ADJUSTMENT . 8 -11 8 - 4 TRANSMITTER ADJUSTMENT . 8 -13 9. VOLTAGE (CIRCUIT) DIAGRAMS . 9 - 1 - 14 SECTION 10. PARTS LIST . 10 - 1 -20 SECTION 11. SCHEMATIC DIAGRAM . 11 - 1 SECTION 12. BOARD LAYOUT . SEPARATE for free by RadioAmateur.eu SECTION 1 SPECIFICATIONS GENERAL Number

7、of Semiconductors: Transistors 71 FET 15 IC (Includes CPU) 25 Diodes 212 Frequency Coverage: 3.5MHz -4.0 MHz 7.0MHz -7.3 MHz 10.0MHz - 10.5 MHz (Receive Only) 14.0MHz -14.35MHz 18.0MHz -18.5 MHz (Receive Only) 21.0MHz - 21.45MHz 24.5MHz - 25.0 MHz (Receive Only) 28.0MHz - 29.7 MHz Frequency Control:

8、 CPU based 10Hz step Pre-mixed synthesizer. Independent Transmit-Receive Frequency Available on same band. Frequency Readout: 6 digit 100Hz readout. Frequency Stability: Less than 500Hz after switch on 1 min to 60 mins, and less than 100Hz after 1 hour. Less than 1 KHz in the range of -10 C to +60 C

9、. Power Supply. Requirements: DC 13.8V 15% Negative ground Current drain lOA max. (at 200W input) AC power supply is available for AC operation. Antenna Impedance: 50 ohms Unbalanced Weight: 6.4 Kg Dimensions: 94mm(H) x 241mm(W) x 275mm(D) TRANSMITTER RF Power: SSB (A3J) 200 Watts PEP input CW (AI)

10、200 Watts input Continuously Adjustable Output power 10 Watts - Max. AM (A3) 40 Watts output Continuously Adjustable Output power 10 Watts -40 Watts . Emission Mode: A3J SSB (Upper sideband and Lower sideband) Al CW A3 AM Harmonic Output: More than 50dB below peak power output Spurious Output: More

11、than 50dB below peak power output Carrier Suppression: More than 50dB below peak power output Unwanted Sideband: More than 55dB down at 1000Hz AF input Microphone: Impedance 1300 ohms Input Level 120 millivolts typical Dynam1c : or Electret Condenser Microphone with Preamplifier RECEIVER Receiving S

12、ystem: Quadruple Conversion Superheterodyne with continuous Pass-Band Shift Control. Receiving Mode: AI, A3J (USB, LSB), A3 IF Frequencies: 1st 39.7315MHz 2nd 9.0115MHz 3rd 455KHz 4th 9.0115MHz with continuous Pass-Band Shift Control. Sensitivity: . SSB,CW AM Selectivity: SSB,CW AM CW-N Less than 0.

13、3 microvolts for 10dB S+N/N Less than 0.6 microvolts for 10dB S+N/N 2.4KHz at -SdB 4.8KHz at -6OdB 6.0KHz at -SdB 18.0KHz at -SOdB (when optional crystal filter installed) 600Hz at -6dB 1.5KHz at -SOdB (when optional AF filter installed) 150Hz at -SdB 1100Hz at -4OdB Spurious Response Rejection Rati

14、o: More than SOdB Audio Output: More than 2 Watts Audio Output Impedance: 8 ohms Specifications are approximate and are subject to change without notice or obligation. 1 - 1 for free by RadioAmateur.eu SECTION 2 OPERATING CONTROLS 2 -, FRONT PANEL OTRANSMIT INoICATOA- METER 5./lT(;H,- MOOE 5.IITCH-

15、, MIC co,mCTOA - (4 PHONES JA,CK- 5 MIC GAIN CCIN1AelL- re RF POWER CClN1ACIL- Il NB (Noi$8 BI.nker) 5.TC;H- 1 AF GAIN CONTROL- 8 RF GAIN CONTAOL- ItAGC 5WITC:H- l PREAMP SWITCH _ .J 2-2 1 ANTIVOX CCIN1AelL- l1 CW MONITOR N.B. WIDTH 5WITCH- !lFREOUENCY SET 2 - 3 REAR PANEL CONNECTIONS (4ANTENNA CCIN

16、EC:TaA-I (gIGROUNO TERMINAL POWER 50CK -I- DISPLAY SWITCH SWITCH SWITCH 1-7TRIT INDICATOR CONTROL SWITCH L _ 14 DIAL LOCK SWITCH L _ 2! TUNING RATE SWITCHES CONTROL KNOB L _ MEMORYIVFO WRITE BUTTON 2-1 3VOX DELAY CONTROL PROCESSOR SWITCH I-ill SWR SWITCH SET CONTROL GAIN CONTROL SWITCH BACK UP TERMI

17、NAL (4,EXTERNAL ALC 1=:lTERMINAL I SPEAKEA JACK HI-,:ev JACK 1!I_-IA(:CE55OAV SOCKET for free by RadioAmateur.eu FRONT PANEL 1. MODE SWITCH This switch selects the mode of operation for both transmit and receive. USB Upper Sideband, mainly for 10, 14, 18,21,24 and 28M Hz bands. LSB Lower Sideband, m

18、ainly for 3.5 and 7MHz bands. ON Continuous Wave, for CW operation on all bands. CW-N Narrow ON. The narrow crystal filter is auto- matically turned ON in this position to improve selectivity when receiving. (When optional crystal filter is installed). AM Amplitude Modulation. 2. POWER SWITCH The PO

19、WER SWITCH is a push-lock type switch which controls the input DC power to the IC-730. When the external AC power supply (lC-PS15) is used, the switch also acts as the AC power supply switch. When the switch is pushed in and locked, power is supplied to the set. When the switch is pushed again and r

20、eleased, power is cut to all circuits except the PA unit. (When the BC-10A is used, power will also be supplied to the CPU. 3. MIC CONNECTOR Connect the supplied microphone or optional microphone, IC-SM5 or IC-HM10 to this jack. If you wish to use a dif- ferent microphone. 4. PHONES JACK Accepts a s

21、tandard 1/4 inch headphone plug for headphones of 4 -16 ohms. Stereo phones can be used without modi- fication. 5. MIC GAIN CONTROL Adjusts the level of modulation according to the input of the microphone. Oockwise rotation increases the micro- phones gain. As the input will vary with different micr

22、o- phones and different voices, the knob should be turned until the Meter needle, in the ALC mode, begins to move slightly within the ALC zone. In SSB and AM modes, when the speech processor is in use, the MIC GAIN CONTROL sets the clipping limits, while the RF POWER CONTROL sets the RF drive level

23、to the maximum power level, where ALC starts at the saturation point of the amplifiers. 6. RF POWER CONTROL Controls the RF output power 10 Watts to maximum (SSB: 100 Watts PEP, CW: 100 Watts, AM: 40 Watts). Clockwise rotation increases the output power. 7. AF GAIN CONTROL Controls the audio output

24、level in the receive mode. Clock-. wise rotation increases the level. 8. RF GAIN CONTROL Controls the gain of the R F section in the receive mode. Clockwise rotation gives the maximum gain. As the control is rotated counterclockwise, the needle of the METER rises, and only signals stronger than the

25、level indicated by the needle will be heard. 2-2 9. T/R (TRANSMIT/RECEIVE) SWITCH This switch is for manually switching from transmit to receive and vice versa. Set the switch to RECEIVE (out) and the IC-730 is in the receive mode. Set the switch to TRANSMIT (in) and it switches to transmit. When sw

26、itch- ing with the PTT switch on the microphone or with the VOX switch set to ON, the T/R switch must be in the R ECE IV E position. 10. VOX SWITCH This switches the VOX circuit ON and OFF. When it is in the ON (in) position, in SSB, T/R switching is accomplished by means qf a voice signal. In CW op

27、eration, semi-break-in switching by means of keying is possible. 11. NB (NOISE BLANKER) SWITCH When pulse type noise such as automobile ignition noise is present, set this switch to the ON (in) position. The noise will be reduced to provide comfortable reception. The blanking time can be selected NA

28、RROW and WIDE, by the NB WIDTH switch under the access cover. It will be effective against any type noises. 12. AGC (AUTOMATIC GAIN CONTROL) SWITCH For changing the time-constant of the AGC circuit. With the switch in the AGC position (out) the AGC voltage is released slowly, and thus is suitable fo

29、r SSB reception. With the switch in the FAST (in) position, the AGC voltage is released faster, and the AGC is suitable for stations suffer- ing from fast fading or when operating in the CW mode. 13. PREAMP SWITCH Switches the preamplifier for the receiver. 14. MEMORYNFO WRITE BUTTON By pushing this

30、 button, A VFOs frequency is written into Memory, or one VFOs frequency is transferred to the other VFO. 15. MEMORY SWITCH Push this switch when you wish to write a frequency into memory, or to call a memorized frequency. 16. TUNING CONTROL KNOB Rotating the TUNING CONTROL KNOB clockwise in- creases

31、 the frequency, while rotating it counterclockwise decreases the frequency. The frequency is changed in 10Hz, 100Hz or 1KHz steps which is according to the TUNING RATE switches. One complete rotation of the tuning knob results in a 1 KHz frequency increase or decrease in 10Hz steps, 10KHz in 100Hz s

32、teps and 100KHz in 1KHz steps. 17. METER When in the receive mode the meter acts as an S meter regardless of the position of the meter select switch. Signal strength is indicated on a scale of S1-S9, and S9 to S9+6OdB. for free by RadioAmateur.eu In the transmit mode the meter has two functions whic

33、h are selected by the Meter Switch (18). They are as follows: Po; Indicates the relative output power. SWR can be measured by placing the switch located inside the top cover to the SWR position. ALC; In this position the meter functions when the RF output reaches a certain level. 18. METER SWITCH Se

34、lects meter function in the transmit mode. 19. TRANSMIT INDICATOR Illuminates when the transceiver is in the transmit mode. 20. FREQUENCY DISPLAY The frequency of the IC-730 is displayed on a luminescent display tube. Since the 1 MHz and 1 KHz decimal points are displayed, the frequency can easily b

35、e read. The frequencies indicated are the carrier frequencies of each mode in AM, USB, LSB and CW. Remember, if you turn the R IT SWITCH ON to change the receive frequency and rotate the RIT CONTROL knob, the frequency displayed will not change. 21. NORMAL/SPLIT (TRANSCEIVE/SPLIT) SWITCH Selects the

36、 relationship of the two VFOs. In the NORM (out) position, one VFO is for both transmit and receive. In the SPT (in) position, one VFO is for transmit and the other is for receive. 22. VFO SWITCH You can select either of the built-in two VFOs with this switch. It also selects the relationship of the

37、 two VFOs with the NORMAL/SPLIT switch. The switch performs the following operations according to its position. A. (NORMAL) Selects the A VFO for both transmit and receive. A. (SPLIT) Selects A VFO for receive and B VFO for transmit. B. (NORMAL) Selects the B VFO in both transmit and receive. B. (SP

38、LIT) Selects B VFO for receive and A VFO for transmit. 23. TUNING RATE SWITCHES The small vernier marks on the tuning knob are changed to correspond to 10Hz, 100Hz or 1KHz steps which is selected by pushing the switch either 10Hz, 100Hz or 1 KHz. 2-3 24. DIAL LOCK SWITCH After the IC-730 is set to a

39、 certain frequency for rag chewing, mobile operation, etc., push the DIAL LOCK switch the VFO is electronically locked at the displayed frequency, thus inactivating the operation of the tuning knob. To change frequency, the dial lock must first be disengaged by pushing and releasing the DIAL LOCK sw

40、itch again. 25. RIT SWITCH Switches the RIT circuit ON and OFF. 26. RIT CONTROL Shifts the receive frequency 800Hz either side of the trans- mit frequency. When the RIT is ON, the RIT INDICATOR is illuminated. Rotating the control to the (+) side raises the receive frequency, and rotating to the (-)

41、 side lowers the receive frequency. The frequency shifted by turning the RIT Control is not indicated on the frequency display. 27. RIT INDICATOR Illuminates when R IT is turned ON. 28. BAND SWITCH The BAND SWITCH is an 11 position rotary switch used for selecting one of the 500KHz segments. The sel

42、ectable bands are 3.5KHz, 7MHz, 10MHz, 14MHz, 18MHz, 21 MHz, 24MHz and 28MHz. (28MHz band is separated to four 500KHz segments.) 29. PASS-BAND SHIFT (TUNING) CONTROL Allows continuous shifting of the pass-band from upper or lower side in SSB and CWo This will reduce interference by a nearby signal.

43、When the optional crystal filter F L-3O is installed, this control allows continuous tuning of the pass-band selectivity by moving the filter up to 800Hz from the upper or lower side in SSB and CWo Not only improves selectivity, but also can improve the audio tone. Normal position is in the center p

44、osition and is 2.4KHz wide in SSB. CONTROLS UNDER THE ACCESS COVER 30. SPEECH PROCESSOR SWITCH Switches the speech processor circuit ON and OFF. This circuit enables greater talk power and better results in D X operation. 31. SWR SWITCH When measuring SWR, calibration SET and SWR reading functions a

45、re selected with this switch. When reading SWR make sure the METER switch on the front panel is in the R F position. 32. SWR SET CONTROL This control calibrates the meter needle to the SWR SET position when you want to determine the value of SWR. The METER switch must be in the RF position and the s

46、et must be transmitting a carrier. for free by RadioAmateur.eu 33. VOX GAIN CONTROL This control adjusts input signal level via the microphone to the VOX circuit. For VOX operation in SSB, adjust the . control so that the VOX circuit will operate with normal speech. 34. VOX DELAY (VOX time constant) CONTROL This controls the transmit to receive switching time. Ad- just it so transmit to receive switching will not occur during short pauses in normal speech. 35. ANTI-VOX CONTROL In VOX (SSB) oper