TS-430 Control Board: IC-2 Waveforms

IC-2 on the control board in an I/O expander chip.  It is a uPD8243c.  This chip is directly compatible with the 8049 processor, and uses instructions received from the processor on pins 8-11 to control 4 output ports. These 4 ports drive the multi-digit florescent display unit.

8243 Pinout

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TS-430 Control Board: IC-6 Waveforms

IC-6 is the static RAM chip that holds the band, frequency,mode, memories for long term storage.  It is used particularly when the radio is turned off in order to keep track of where you were operating.  When the rig is turned back on, data is read from the ram chip and the radio is set up in the last known state before it was turned off.

uPD5101 Ram Chip pinouts

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TS-430 Control Board: IC-4 Waveforms

IC-4 is an 8-Channel Data Selector switch that is used to read the status of various switches or buttons from the front of the rig, as well as the microphone.

The Processor (IC-1) chooses which data input line to read by setting an address on pins 11-13, and setting the Disable pin low. IC-4 then passes the state of the selected input line to the processor on pin 14.

TC4512 Pinout

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TS-430 Control Board: IC-5 Waveforms

**Note: All measurements below were using a x10 probe, but I forgot to set the scope to show that.  So rather than the 100mv/division that shows in the photos, I was actually using 1.0v/division.

IC-5 is an 8-Channel Data Selector switch that is used to read the status of various switches or buttons from the front of the rig, as well as the microphone.

The Processor (IC-1) chooses which data input line to read by setting an address on pins 11-13, and setting the Disable pin low. IC-5 then passes the state of the selected input line to the processor on pin 14.

TC4512 Pinout

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TS-430 Mode Switch Diagnosis

One of my followers of this blog wrote to ask for help with diagnosing his Kenwood TS-430 transceiver. The problem was reported as being “stuck” in USB mode, unable to switch to other modes.  While running through the diagnosis via email, it became clear that many of the functions/switches were not operating.

He had cleaned the switches and even gone so far as to swap them into a working radio to test them.  So the problem appeared to be something on the Control Board.

Using his Voltmeter, he was able to verify that the control voltages from the switches were present and changing appropriately at the input to the Control Board.

Control Board area of interest

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