KENWOOD Equipment Modifications List
Service Notes
Standard service
Repair notes
Theory of operation
RF attenuator 10db step option
Poor or no reception with packet receive signal
Extended RF range and scanner modification
Mods for the late model TH-78A
Final module hints
All band modification
Play computer games using the display
Activate the AM detector for aircraft band
MARS mods for newer production runs
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
Extended range including MARS/CAP frequencies
Extended transmit and 800Mhz modifications
Adding an external 900Mhz antenna to the 440 module
MARS/CAP modifications
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
PLL unlock
Service notes on the receiver
Service notes on the transmitter
Meter lamp longer life
Audio tone on TX
Optional ceramic filter
Intermittent TX
Final module replacement
Memory Channel 7 indicator erratic
TX frequency response voice or DTMF
Transmit time delay
Final transistor replacement
Antenna input transformer replacement
Hum in SSB TX mode
Band pass filter change
VFO stability
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
Low pass filter optional changes
Noise blanker improvements
Intermittent PLL unlock in FM/AM
PLL unlock at high temperatures
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
Power supply failure, -6VDC
CW filter select control
IF unit Q2-Q7 protection
Speech processor alignment
General service notes
TA7201P substitution parts kit
Low voltage supply optional improvements
CW pitch tone filter
RF feedback
15 meter internal beat note
Intermittent transmit power output
PLL Unlock condition
AVR unit capacitor change
Signal to Noise ration improvements
SSB talk power improvement
Erratic display
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