[Kenwood] (no subject)

Wed, 07 May 2003 22:33:50 -0400

Hello Dave,

This problem is covered in a Kenwood Technical Bulletin, ATB-0020 "TS-870S PLL
UNLOCK WHEN THE SO-2 IS INSTALLED"

The symptom is as you've described, resulting in an "ERR" on the display.  It is
caused by insufficient bias on Q501 on the PLL board.  The fix is to change the
value of R506 from 33K to 18Kohm, and then realign L518, L519, L520, L529 and
L530.  The realignment is performed by connecting an RF voltmeter to the "TP
55MHZ" point, and adjust all 5 coils for peak output.

The tech bulletin should be available from Kenwood's site.  If you can't find
it, let me know and I can send you a copy.

73 de Alan W2AEW

David Hildebrand wrote:

> I just installed a (used) SO-2 TCXO oscillator in my TS-870.  The
> installation seemed to go well but now, with the slide switch in position to
> activate the TCXO I get an "ERR....F E" message on the display and nothing
> else.  If I place the slide switch back in the normal position everything
> works fine.  I have done both a partial and a full re-set of the
> microprocessor but to no avail.  Anyone had a problem like this or a
> suggestion as to what might be going on?
> ----
> Dave  (VE9AV)
>
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>
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> Larry Wilson KE1HZ [email protected]
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--
Alan Wolke, W2AEW
"i usta cuDn't speL enjinere, noW i ar wuN"