Are there any problems with the Kenwood ts-440?
By James Holden
Are there any problems with the Kenwood ts-440?
I recently ran into some problems with my Kenwood TS-440S. Here is a list of my problems. 1. Garbled and Distorted RX audio like its “Under Water” 2. Intermitant operation. I would loose all display and all audio.
Why is VCO1 filled with glue on Kenwood ts-440?
VCO1 filled with glue. The problem Kenwood TS-440 is designed as a mobile transceiver. To withstand mobile use, some of the circuit boards are partly covered with glue (“goop”) in order to prevent components from vibrating and causing frequency instability.
What do you need to repair a ts440s?
Tools needed: A good DMM (Digital Multi-Meter), Set of Small regular Screwdrivers, small phillips screwdriver, magnifying glass of some sort, Fine tipped 25W solder pin, Solder, tweezers, pick, plenty of light, and a large work table / area. This is the TS-440S with no top cover. You can see the IF Board.
What can I substitute for the itt310te on a Kenwood ts-440?
The original varicap ITT310TE (D44, D46, D48, D50) can be substituted by BB139. The original switching diode MA858 (D45, D47, D49, D51) can be substituted by BA244. For C175, C182, C188, and C195 the factory value of 5 pF may be too low.
I recently ran into some problems with my Kenwood TS-440S. Here is a list of my problems. 1. Garbled and Distorted RX audio like its “Under Water” 2. Intermitant operation. I would loose all display and all audio.
VCO1 filled with glue. The problem Kenwood TS-440 is designed as a mobile transceiver. To withstand mobile use, some of the circuit boards are partly covered with glue (“goop”) in order to prevent components from vibrating and causing frequency instability.
Tools needed: A good DMM (Digital Multi-Meter), Set of Small regular Screwdrivers, small phillips screwdriver, magnifying glass of some sort, Fine tipped 25W solder pin, Solder, tweezers, pick, plenty of light, and a large work table / area. This is the TS-440S with no top cover. You can see the IF Board.
Where is the PLL Board on a ts440s?
After time this compound can get conductive and cause problems in the RF board and PLL board. If it is brown or shows a few volts when you probe it to ground then its bad. PLL board. Located under the IF board. VCO5 (cover removed see next page) Remove the PLL board from the TS440S. Remove all screws and unplug all cables.
