Kenwood - All modification.pdf

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1、Modifications for the KENWOOD (AT-50)AT-50 Blows ACCY fuse in TS-50S English language (AT-50)AT-50 Blows ACCY fuse in TS-50S (Part 2) English language (AT-50)AT-50 Mechanical stability English language (DG-1)Service Note on DG-1 English language (DG-1)DG-1 Standard service procedure English language

2、 (DG-5)Repairing DG-5 English language (DG-5)Reparing DG-5 English language (DG-5)Theory of Operation English language (DG-5)DG-5 Standard service procedure English language (GENERAL) KENWOOD TH-series HT TNC Interconnection English language (GENERAL) Service manual rx section level diagrams English

3、 language (GENERAL) How to build COMPUTER INTERFACE English language (GENERAL) How to remove Display-Scratches English language (GENERAL) Kenwood 4 pin microphone connections to TNC English language (GENERAL) Kenwood 6 pin microphone connections to TNC English language (GENERAL) Kenwood 8 pin microp

4、hone connections to TNC English language (GENERAL) Kenwwod mic modification English language (GENERAL) Optional narrow ceramic filters English language (GENERAL) VFO-230 Operation on 240V AC English language (GENERAL) Service manual TX level diagrams English language (GENERAL) Power module heat sink

5、 compound English language (GENERAL) The MIC pin configurations English language (MC-44)MC-44DM Microphone audio improvements English language (MC-44)MC44/MC44DM Intermittent modulation English language (MC-45)Making the MC-45 Microphone work on the TR-7400A English language (MC-46)MC-46 DTMF Mic. W

6、ith older equipment English language (MC-48)MC-48B Mic element change English language (MC-50)VOX-3 Sensitivity and Delay English language (MC-55)MC-55 Change in mic element (T91-0328-08) English language (MC-60)Modifikation MC-60 German language (MC-60)Kenwood MC-60 Microphone Mod (Connect to ICOM

7、IC-746) English language (MC-60)Remove RFI in the MC60 English language (MC-85)Mod for MC-85 MIC and RC-1A phone English language (MC-85)Connect Kenwood MC-85 to Yaesu FT-100 English language (PS-430)No protection on Powersupply English language (PS-430)PS-430 Voltage increase with TH-205/215 Englis

8、h language (PS-50)PS-50 Improved Voltage Surge Protection English language (QR-666)QR-666 VFO stability English language (R-1000)Kenwood R-1000 muting English language (R-1000)R-1000 AGC, AM bandwidth changes English language (R-1000)R-1000 RF attenuator 10 dB step option English language (R-5000)Ke

9、nwood R5000 Modification Notes English language (R-5000)R-5000 No Freq. Change thru Computer Interface English language (R-5000)Increase the MW sensitivity for R-5000 English language (R-599)Service Notes on R-599A/D English language (R-599)Removing CB Band from R-599A/D English language (RC-10)RC-1

10、0 Hang up time/timeout timer settings English language (RC-10)RC-10 Alternator noise English language (RC-1A)Mod for MC-85 MIC and RC-1A phone English language (RM-76)RM-76 Battery Back Up Power English language (RM-76)RM-76 Microprocessor failure English language (SM-220)SM-220 Shield Installation

11、English language (SM-220)Feedback Between Pan display and IF Out English language (SM-230)SM-230 Bandscope attenuator English language (SM-230)SM-230 RTTY cross pattern attenuation English language (SMC-34)SMC-34 Distorted/muffled transmit audio English language (T-599)Service Notes on T-599A/D Engl

12、ish language (T-599)Reducing 120Hz hum in T-599D English language (TF-541)TF541E CP1-CP4 in the PLL unit. English language (TS-950)Kenwood TS-950S top with speaker lead, and bottom. 3. Unplug the top and bottom connectors from the DG-1 unit. 4. remove the Digital Unit assembly by removing 4 screws f

13、rom the chassis underside. 5. Disassemble the Digital Unit; remove 8 screw and slide off the cover. 6. Remove both PC Board, 4 screws each. 7. For those connector pins joining top and bottom foil paths; reheat pin, flow .031 diameter solder from the top to insure the solder joint through the PC Boar

14、d. 8. Wash the board to board Molex connectors with FRESH trichlorethelyne. Heat dry and inspect for flux residue. If necessary, reclean. Also remove the pin connectors from the DG-1 chassis, (note they insort from the Digital PC Board side) and clean in FRESH trichlor. Heat dry and spray with silic

15、one lubricant. Spray into the board mounted connectors with silicone. 9. Reassemble by reversing step 8,6 and 5. 10. Reinstall by reversing step 4, 3, and 2. How to solder on the DG-1 board. 1. Use a low power pencil, 35 W or less! 2. Use rosin code solder, small diameter. 3. Do not create solder br

16、idge or splotches. 4. Do not overheat or otherwise lift the foil from the board. 5. Wash excess flux away with FRESH trichloretheylyne and a small flux brush. Neatness counts - its YOUR radio. Note: 1. The best possible method of cleaning the Molex connectors is by ultrasonic cleaner and fresh solve

17、nt. Otherwise, use a spray. 2. In extreme cases, replace the Molex connectors, 6 pieces E40-0607-05. 3. For 15 See service manual for proper levels. Note: Operation of the circuits are essential before proceeding. Its been Kenwoods experience that when problems do occure with the DG-5 that spproxima

18、tely 90% of the problem will be caused by insufficent solder connectiond and not the actual components themselves. Note: We suggest the following procedure if BUFFERS, MIXERS and OSCILLATORS are working properly: See service manual for proper levels. Check A. All solder connections (loose or good).

19、B. Solder all plated thru holes; 32 gauge wire inserted in plate holes tajes approximately 30 minutes to do and 15 very, very effective. Service suggestions: A heat gun and freeze spray often are very effective in locating cold or non-plated thru holes. A. Heat board with head gun (expands board). T

20、his often caused dormant or loose connection to appear. This modification is read 569 times. top of page 19-02-2000 (DG-5) Theory of Operation Author: Trio-Kenwood Communication, inc. Service bulletin no. 29 (8-2-1978) The DG-5 is a dynamic display type frequency counter. All this means is that fewe

21、r wires and decode drivers are needed for frequency displaying. We shall start the explanation of the DG-5 with the reference osc. (Q21). This circuit provides the timing pulses, calibration and scanning pulses for operation of the DG-5. The ten MHz ref. osc. is divided 1/10 by IC5 to provide calibr

22、ated one MHz output. It is then further divided by IC6 and IC7 1/100. The divided signal is then passed thru IC8 which consists of two sections, a 1/5 amd 1/2 divider. The divide by 1/5 section now gives a resultant 2KHz signal on its output. This is the scanning pulse. IC40 receives the scanning pu

23、lse which is a decode driver (Neg. Logic Type) is used to switch Q25-Q30 via terminals T1-T6 to put a plus voltage on display D1-D3 (LED Type). At the same time, outputs T1-T6 of IC41 are inverted by IC42 positive logic and the B.C.D information is presented to IC32-IC37 the and-orinvert gates which

24、 provide the conditional inputs for the multiplexer or distributor. IC38 provides Neg. Logic inversion for IC39, the decode driver. The multiplexer information starts with the heterodyne of three components, ref. osc., carrier and VFO input signals. IC26-IC31 are the multiplexer inputs. These are la

25、tches which store B.C.D informationuntil they are told to release their output by IC3 the strobe or latch signal. I will mention now, that if the HET or VFO input signal are absebt, that the blanking circuits will take effect. At this time the HET input is amplified and is wave-shaped by the Schmidt

26、 Trigger IC1 and IC1B. The carrier outputis then mixed with the belance mixer Q16 and Q17. Its output is then mixed again with VFO and its output appears on Q18 drain. Its buffered by Q19 and waved-shaped by IC2B. This output is placed on timing window IC2C. Two signals are presented to the timing w

27、indow; 1) signal to be measured, 2) gating signal .1 sec. in length (IC11 pin 8). The DG-5 contains two window circuits IC2C and IC1C. IC1C forms the HET counter window circuit and IC2C forms the preset counter circuit. With a gate signal the HET counter begins to count the pulses which pass thru th

28、e gate, and se does the preset counter circuit. The outputs of the timing windows are a ratio of signal input divided by gate pulse. Example, with a .1 sec. gating pulse the display would be updated once ever .2 sec period. If a 1.2MHz input was measured, the display would read 1200 in KHz. The gate

29、d output information of IC1C is then distributed on the HET counters IC-12-IC18. At this time it should be realized that IC41 the decode driver is used merely to supply a puls voltage to display and is controlled by 2 KHz scaning pulse. IC2D is gated with the same . 1 sec. pulse and the output signa

30、l to be measured is the ratio of signal input (VFO. ref. and carrier) divided by gate pulse. Both HET and preset B.C.D. information is presented to latch circuits which is then sent to decode driver IC39 for display information. Since only one decode driver is being used for all displays, the condit

31、ional inputs of IC32-IC37 must be turned on and off quickly in order not to be detectable by the human eye. This is done easily by the high speed TTL circuits. Note: The display scheme of the DG-1 and DG-5 are essentially the same. The theory of operation is therefore applicable to the DG-1 display

32、as well. This modification is read 567 times. top of page 20-02-2000 (DG-5) DG-5 Standard service procedure Author: Trio-Kenwood Communication, inc. Service Bulletin no. 54 (10-8-1979) (Supplement to the DG-5 Service Manual) Introduction A majority DG-5 failures are caused by nothing more than an in

33、termittent opening of a plated-through hole connecting top and bottom foil paths of the PC Board. Before any component level service is attempted, it is advisable to eliminate the possibility of an intermittent connection causing or complicating Counter failure. Procedure: 1. Disconnect all cables.

34、2. Remove cabinet; 2 screws at the rear, 2 screws with star washers on the bottom. 3. Disassemble display from chassis; 4 countersunk screws on the side rails. 4. The display unit has 2 through holes without leads, and the Counter main Board has 82 through holes without leads passing through them. I

35、deal service would be to first remove all solder from these holes using devices as a Pace Sodr-X Tractor, EREM Soldovac, or WIK-IT braid. Then pass a length of #24 tinned bare wire into each clean through hole, solder, and clip flush. For the 10 holes listed under ICs solder sparingly so as not to c

36、reate a solder bridge under the component. For the remaining 72 holes, inspect each pinned connection from both sides to insure (1) no bridge and (2) a good solder joint. 5. Wash the Display to Counter Board PC Board connectors (male and female) with FRESH trichlorethelyne. Heat dry and inspect for

37、flux residue. Spray the connectors with silicone. 6. Similarly, clean and coat the rear panel RCA jacks as in step 5. 7. Reassemble, reversing step 3,2,1. How to solder on the DG-5 PC Board 1. Use a low power pencil, 35W or less! 2. Use rosin core solder, small diameter. 3. Do not create solder brid

38、ge or splotches. 4. Do not overheat or otherwise lift the foil from the board. 5. Wash excess flux away with FRESH trichlor. and a small flux brush. Neatness counts - its YOUR radio. Through hole accounting Display unit - 2 Counter unit - 82 Total 84 Locations: a. Under; IC2, 4, 13, 20-25, 34 1 each

39、 Total - 10 b. Adjacent or between; IC3, 13-14, 15-16, 22-23 IC1-2, 6, 18 IC12 - 1 each - 2 each - 3 each Total - 13. c. Located between rows; IC13-18, 20-25 20-25, 26-31 IC26-31, 32-37 IC32-37, 38-39 - 5 - 10 - 15 - 25 Total - 55 d. At rear panel; FS7805 regulator 2SD235 transistor - 1 - 3 Total -

40、4 e. Display unit - 2 Additional Point 1. R126 the sleeve of this plug is the common ground for PTT, transmit audio, and receive audio. A miniature stereo plug is used for transmit audio and PTT. Connect the middle ring of the plug to the TNC audio out through a 0.2 uf cap (for DC isolation). Connec

41、t the sleeve of the plug to the TNC PTT. The plugs tip is unused. Set the TNC audio for 50 to 80 mv audio output into a 2K ohm impedance. This modification is read 950 times. top of page 19-07-1998 (GENERAL) Service manual rx section level diagrams Author: Trio-Kenwood Communication, inc. Service Bu

42、lletin no. 941 (28-10-1988) Introduction This bulletin will explain the development and use of Kenwood Service Manual receiver section level diagrams. Since they list typical RF and audio levels, the diagrams provide the most efficient means of locating a faulty RX circuit in a transceiver. In the p

43、ast, Kenwood has recorded RF levels in volts (V), decibels (dB), and more recently dBu and dBm. Conversion tables and an equation are provided at the end of this text so you can change the RF levels to the form of your choice. Using the level diagrams require basic test equipment and a couple of tes

44、t fixtures. One fixture is an 8 ohm non inductive load that replaces the internal speaker. The other is an injection probe. It is used to inject RF from your signal generator into specific sections of the receiver. Both fixtures are discussed at the end of this text. How the rx section level diagram

45、 is developed This section will describe how the level diagrams are made for CW and SSB transceivers. It will then discuss the different methods used for FM transceivers. A working transceiver is tuned to its center frequency. For HF rigs, this would be 14.200MHz. A Standard Signal Generator (SSG) s

46、et to the same frequency is connected to the antenna terminal of the transceiver. The SSG is set to a level that will not allow the AGC circuits to function (no S-METER reading). For HF rigs, this would typically be 0dB (0.5V). An 8 ohm load is inserted into the external speaker jack and the AF gain

47、 control is adjusted to obtain 0.68V across the load (measured with an AF VTVM). The AF gain setting is not changed from this point on. The SSG is replaced with a 50 ohm load to terminate the antenna input. An injection probe is connected to the SSG. The ground clip is attached to the chassis of the

48、 transceiver. The probe is placed at the first point listed on the level diagram just past the antenna input. The SSG level is adjusted until the audio output is again 0.68V. The SSG level is then listed on the diagram as a typical reference for that point. This process is repeated until all measuri

49、ng points are assigned a reference level. NOTES After each mixer stage, the SSG must be adjusted to the respective IF frequency. As an example, after the first mixer on the TS-940S, the frequency would be set to 45.05MHz. After the second mixer, the frequency would be set to 8.83MHz. The levels in the audio stage of the receiver are measured with an AF VTVM. These measurements are made when the SSG is connected to antenna terminal (just after the AF gain is set). FM rx section level diagrams FM transceiver level diagrams are made in the sam