KENWOOD RTX Service Manual

Notes by EB5AGV
-Pages are in .TIF format, as originally published by Kenwood Italy
-Right-click on links and save the pages for further viewing
-Missing TIF pages: 20, 21, 22, 23, 25, 35, 36, 77, 78 and 80 (you can get most of them from the original PDF file but with lower quality)
-Fully missing pages: 77, 78 and 80 - any help obtaining these will be appreciated!
-Supposedly blank pages: 58, 68 and 92 (they are missing but probably were blank)

-UPDATE 20/6/2011 - I have found the original TIF files for pages 20, 21, 22, 23, 25, 35 and 36 and have been added to this page.

-UPDATE 20/6/2011 - UPDATED combined version with all that is available (courtesy of Randy K9OR): UPDATED COMBINED PDF file


INDEX

POWER SUPPLY CIRCUIT

1. Power is Not Turned ON (For models containing an AC power supply)...............................5

...............................................................................................................................................6

2. Power is Not Turned ON (For models with an external power supply) .............................. ..7

3. Power is Not Turned ON (For models with a software sense type power switch) .................8

4. The Voltage Cannot be Adjusted .........................................................................................9

5. Example ............................................................................................................................10

.......................................................................................................................................11 | 12

6. Models That Can Use Two-way Power Supplies (TS-711, TS-811, etc.)...........................13

..............................................................................................................................................14

RECEPTION CIRCUIT

1. No Reception (No Noise),..................................................................................................15

..........................................................................................................................16 | 17 | 18 | 19

2. Signals are Not Received (Noise is Output) ........................................................................20

..............................................................................................................................................21

3. Receiver Sensitivity is Low..................................................................................................22

4. The Reception Frequency Fluctuates and The Reception Tone is Wrong..............................23

..............................................................................................................................................24

5. Frequency Shift .................................................................................................................25

..............................................................................................................................................26

6. The Reception Tone Breaks ...............................................................................................27

7. Receive Tone distortion........... ...........................................................................................27

8. The sound is low ................................................................................................................28

9. S-meter..............................................................................................................................28

10. Cross Modulation ............................................................................................................29

11. Mobile and Handy Transceivers........................................................................................30

........................................................................................................................................31 | 32


TRANSMISSION CIRCUIT.............................................................................................33

1. Transmission is Impossible..................................................................................................34

........................................................................................................................................ 35 | 36

2. No Transmission Power is Output (The ON-AIR Indicator Lights)......................................37

2. Low Power (The ON-AIR Indicator Lights).......................................................................37

..............................................................................................................................................38

4. Cannot Adjust Power (The power cannot be adjusted by the ALC)....................................39

5. ALC Meter........................................................................................................................40

6. The Max Power is Low......................................................................................................41

7. SWR Meter.......................................................................................................................41

8. RF Meter and Power Meter...............................................................................................42

9. Break IN...........................................................................................................................43

10. VOX...............................................................................................................................43

11. PROC (Processor)..........................................................................................................43

12. Transmission Tone Quality is Poor...................................................................................44

13. Defective PLL.................................................................................................................45

14. Power Fluctuation ..........................................................................................................45

15. High Noise.....................................................................................................................46

16. Mobile and Handy Transceivers......................................................................................46

.............................................................................................................................. 47 | 48 | 49


DIGITAL CIRCUIT

1. Display Error....................................................................................................................50

2. How to Check The Microcomputer..................................................................................50

3. Nothing is Displayed ........................................................................................................51

4. The Display is Dark .........................................................................................................52

5. Meaningless Display or Display Error................................................................................53

6. Keys are Not Accepted....................................................................................................53

............................................................................................................................................54

7. How to Find Missing (holes in a board, broken patterns, capacitors or coils).....................55

8. Checking Waveforms With the Power ON ......................................................................56

9. Mobile and Handy Transceivers........................................................................................57


PLL CIRCUIT

1. PLL.................................................................................................................................59

2. Unlock.............................................................................................................................60

3. How to Check the PLL Data Lines (1).............................................................................61

4. How to Check the PLL Data Lines (2).............................................................................61

5. Tips for Repair (For Repairing PLLs)...............................................................................62

6. DDS (Direct Digital Synthesizer).......................................................................................63

7. TS-440 PLL Checkpoints................................................................................................64

8. TS-440 Last Loop Checkpoint........................................................................................65

9. Quick Chart of PLL IC Input/Output Pins.........................................................................66

10. PLLs of Mobile and Handy Transceivers.........................................................................67


AUXILIARY CIRCUITS

1. Noise Blanker .................................................................................................................69

2. Notch Circuit...................................................................................................................70

3. Encoders.........................................................................................................................71

.....................................................................................................................................72 | 73

4. RF Attenuator..................................................................................................................74

5. Filter Switching................................................................................................................75

6. Automatic Antenna Tuner (AT)........................................................................................76

............................................................................................................................... 77 | 78 | 79


SERVICE MANUAL

1. Reading the Service Manual.............................................................................................80

2. Rules for Parts Lists.........................................................................................................81

3. Adjustment......................................................................................................................82

.....................................................................................................................................83 | 84

4. Reading Circuit Diagrams ................................................................................................85

5. Functions of Components.................................................................................................85

...............................................................................................................................86 | 87 | 88

6. Rules for Naming Terminals .............................................................................................89

7. Reading Level Diagrams...................................................................................................90

8. Options............................................................................................................................91


ADDITIONAL INFORMATION 1 (To prevent repeated repairs)

1. TS-930, TS-940.............................................................................................................93

2. TS-950S/SD Final Transistor Failure...............................................................................94

3. TS-440 Unlock (R-5000) ..............................................................................................95

4. TS-940 Unlock..............................................................................................................95

5. TS-790..........................................................................................................................95


ADDITIONAL INFORMATION 2 (Measurements)

1. How to Estimate the Voltage..........................................................................................96

2. How to Measure the Radio Frequency Carrier Level (200MHz or Higher)......................96

3. How to Measure the Level With a Spectrum Analyzer....................................................96

4. Observing the Harmonic Spurious..................................................................................97

5. Check the Characteristics of the Band-Pass Filter With the Spectrum Analyzer ..............98

6. How to Measure SSB Sensitivity; 10dB S/N Method ...................................................99


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