KENWOOD Equipment Modifications List

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AT-930 Service Notes
BS-8 Alignment with TS-180S
DG-1 New display tube

Service Notes

Standard service

DG-5 Repair

Repair notes

Theory of operation

Standard service

HMC-1 Not to be used with TH-205AT / TH-215A
MC-45 Modification for use with TR-7400A
MC-46 DTMF operation with older equipment
MC-55 Change the microphone element
PS-50 Improve voltage surge protection
R-1000 Muting

RF attenuator 10db step option

R-5000 No frequency change by computer interface
R-599A/D Service Notes
RM-76 Microprocessor failure
SMC-25 Modification for use with the TR-2400
T-599A/D Service notes
T-599D Reducing 120hz hum
TH-205 Protection fuse replacement with diode
TH-215 Protect fuse replacement with diode
TH-25 Automatic power off
TH-27A Extended RF range and enable AM detector for aircraft band

Poor or no reception with packet receive signal

Extended RF range and scanner modification

TH-28A Extended RF tuning range modification
TH-47A Extended RF tuning range and scanned modification
TH-45 Automatic power off
TH-78A Enable expanded RF range and cross band repeat

Mods for the late model TH-78A

TH-79 Extended RF tuning range
TL-922 T/R relay sticking with slow power-up condition
TM-201 Increase TX audio
TM-401 Increased TX audio
TM-321 9600 baud modification for Packet
TM-221A No TX in high power due to voltage drop

Final module hints

TM-721A Low or no VHF power output
TM-2550 DCL call sign data
TM-2570 Low TX power output
TM-411 Low or no receiver sensitivity
TM-421 9600 baud modification for Packet
TM-732 Extended range on UHF receive

All band modification

Play computer games using the display

Activate the AM detector for aircraft band

MARS mods for newer production runs

TM-733 Cross band repeat modification
TM-741 All band modification

Play computer games using the display

Activate the AM detector for aircraft band

Cross band repeat modification

Extended receiver modifications through 999Mhz

Extend receiver range with dedicated 900Mhz antenna

Automatic transmit when pressing DTMF keys

Extend transmit range

Adjustable microphone audio

TM-742 MARS/CAP modifications

Extended range including MARS/CAP frequencies

Extended transmit and 800Mhz modifications

Adding an external 900Mhz antenna to the 440 module

TM-942 MARS/CAP modifications

Extended range including MARS/CAP frequencies

Extended transmit and 800Mhz modifications

MARS/CAP modifications

Adding an external 900Mhz antenna to the 440 module

TR-751 9600 baud modification for Packet
TM-941A Extended RF tuning & cross band repeat
TR-2200A Service notes
TR-2400 Tone encoder RFI

Unwanted noise tone or burst at TX

Display or keyboard problems

RX low intermittent or distorted

Unlock condition

Scratchy TX

Volume control replacement

Battery charger failure

TR-2600A PLL unlock troubleshooting

PLL unlock

TR-7200A Service notes
TR-7400A Service notes on the PLL and LED display

Service notes on the receiver

Service notes on the transmitter

Meter lamp longer life

TR-7600 Alternator whine

Audio tone on TX

Optional ceramic filter

TR-7625 Alternator whine

Audio tone on TX

Optional ceramic filter

Intermittent TX

Final module replacement

TR-7730 TX frequency response voice or DTMF
TR-7800 Memory loss

Memory Channel 7 indicator erratic

Optional ceramic filter

TR-7850 RF LED meter low reading

Memory Channel 7 indicator erratic

TR-7930 Rx interference
TR-7950 Rx interference
TR-8300 Alignment
TR-8400

TX frequency response voice or DTMF

Transmit time delay

TR-9000 Optional ceramic filter
TR-9130 Low drive level
TS-120 VOX operation pick-up time

Final transistor replacement

Antenna input transformer replacement

Hum in SSB TX mode

Repair notes

Band pass filter change

VFO stability

TS-140 Intermittent loss of transmit power
TS-180S DFC hum with PS-30 power supply

IF #2 output level change

Increase of RX audio output

Low 40 Meter ALC

Trouble sheet

CW delay during VOX memory operation

Use with a power amplifier

VFO stability

Low pass filter optional changes

TS-430S Notch control

Noise blanker improvements

Intermittent PLL unlock in FM/AM

PLL unlock at high temperatures

TS-440S ACC #2 data jack wiring interface

Installing the IF-232

Operating with the MC-85

Notch filter low frequency improvements

Protecting Q33

Case screws binding in the heat sink

CW sidetone improvements

Receive audio mods to improve audio quality

TS-520 Service notes
TS-520S CW frequency shift

Power supply failure, -6VDC

CW filter select control

TS-530S Low voltage supply optional improvements

IF unit Q2-Q7 protection

TS-690S Extend RF tuning range
TS-700A Service notes on the power supply

Service notes on the transmitter

Service notes on the receiver

TS-820S AUX band installation

CW filter select control

Speech processor alignment

General service notes

Service notes on the transmitter

Service notes on the receiver

TA7201P substitution parts kit

TS-850S Extend RF range
TS-830S Frequency shift

Low voltage supply optional improvements

TS-930s SSB transmit tone quality

PLL unlock

CW pitch tone filter

RF feedback

15 meter internal beat note

Intermittent transmit power output

TS-940S LCD clock display erratic operation

PLL unlock

PLL Unlock condition

AVR unit capacitor change

Signal to Noise ration improvements

SSB talk power improvement

Erratic display

TS-950SD General coverage transmit modifications
VFO-120 Dial lamp switching circuit

 

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