Modifications for the Kenwood TS-430

Picture(s) of Kenwood - TS-430

19-07-1998 TS-430S Noise blanker improvements English language (5 Kbytes)
19-07-1998 Kenwood ts-430 AGC mod English language (1 Kbytes)
19-07-1998 Transmit enable for mars/cap frq for the TS-430S English language (1 Kbytes)
19-07-1998 Mods for the kenwood TS430S for amtor English language (1 Kbytes)
19-07-1998 TS430 power fault - ANSWERS English language (5 Kbytes)
19-07-1998 TS-430S Intermittent PLL Unlock in FM/AM English language (9 Kbytes)
19-07-1998 TS-430S PLL Unlock at High Temperatures (Revision) English language (6 Kbytes)
19-07-1998 TS-430 extended coverage. Include 0-150 KHz English language (0 Kbytes)
19-07-1998 TS-430S Reset the microprocessor English language (0 Kbytes)
26-01-2000 Kenwood TS-430S, no display, no RX/TX with certain modes English language (2 Kbytes)
23-03-2000 No signal on the meter English language (0 Kbytes)
09-04-2000 TS-430S 500KHz Hetrodyne English language (10 Kbytes)
09-04-2000 TS-430 Notch Control English language (167 Kbytes)
09-04-2000 TS-430S AM Wide/Narrow filter selection English language (97 Kbytes)
09-04-2000 TS-430 receiver internal beat English language (22 Kbytes)
15-04-2000 TS-430S Low/intermittent RX English language
24-07-2001 Circuit Improvements for the TS-430S English language (11 Kbytes)
26-07-2001 Some repair hints for TS-430 English language (1 Kbytes)
05-10-2001 General coverage in transmission for the Kenwood TS-430S English language (0 Kbytes)
 View all modification in one click. This can be a very big file.!! (363 Kbytes)

15-04-2000
TS-430S Low/intermittent RX
Author: Trio-Kenwood Communication, inc.


Service Bulletin no. 902 (18-10-1985)

Low or intermittent receive on the TS-430S may be caused by a poor contact on one or more of the LPF relays. In most cases the following procedure will correct this problem without having to replace relays. The procedure has two steps; first initial cleaning of the contact by passing a relatively high current thru them (about 500 mA), and then installing a contact maintenance circuit that will apply a relatively low current (about 8 mA) whenever a new band is selected.

Procedure:

  1. Initial contact cleaning procedure.
    Parts List:
    56 ohm 5W ceramic resistor (R92-0622-05) 2 mA

    1. Press and hold the "UP" bandswitch of the TS-430S (ensure the 1 MHz switch is ON).
    2. Apply 13.8V DC to the antenna terminal thru a 28 ohm, 10W resistor for approximately 1 minute. This will cycle thru all the relays and burn any axidation/contamination from the contacts.


  2. Contact maintenance circuit installation.
    Part List:

    Terminal Strip (E22-0371-05)
    C1, C2 (CK45D2H473M) .47 F 500V
    C3 (C91-0117-05) .01 F 50V
    L1 (L33-0259-05) 470 H
    R1 (RD14CB2E102J) 1 Kohm Watt
    Small length of hookup wire . 6 inches

    1. Disconnect the center lead of the coaxial cable from the antenna terminal.
    2. Install the contact maintenance circuit as shown in the accompanying diagrams. Attach the terminal lug strip with one of the filter unit over screws.
    3. Solder the 0v lead to the "JP" terminal of the Filter Unit.



This procedure should may be performed only to those units received for this specific repair symptom. Time required for this procedure is 1 hour or less.

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