[Kenwood] WB8 WTU de AG6CX re:TS-940S Question

Tue Mar 1 14:04:59 EST 2016

Gary and Clif, thanks for response.
I misspoke in my initial rant: it was the definition of "RV" I was/am confounded by. I was aware "VR" referred to the "trim-pot."
From main instruction manual, p.50,
Item 11-2 ADJUSTMENTS:
1. RV voltage adjustment (Control Unit)
Adjust voltage to 2.1 V with VR-1.
Ok. Easy enough to find VR-1 on control board, but instruction book entry failed to say where measurement of 2.1 v is taken. 
Heading to service manual, P 68 indeed leads to step 1 in measurement of adjusting RV and RB in the IF unit, and where to do it, (RV on term 13 pin2; RB on term 10, pin 5 stated corrected by Clif to pin 1).
But couldn't find where RV and RB were defined. What does RV and RB mean, and did I miss where they were discussed? 
Moving to Page 81, my version of the manual shows VR-1 in the lower right front corner for sure, just as on the board, as Clif says.
Page 80 in my service manual shows shaded pin 1 in uncircled "10" lower left hand corner of PLL unit. I don't see to 8.8 MHz filters on the page, but I guess we are telling about he same measurement point.
My frustration was about the operating manual telling me how to make adjustments without telling me where. Guess the service manual in one hand instruction manual in the other.
Thanks for your comments Clif and Gary. The "buzzer" is still illusive.
Thanks for your continued contributions to the blog.
73,
Ed McCann
AG6CX
**********
Sent from my iPhone
> On Feb 29, 2016, at 3:21 PM, clif at avvid.com <avvidclif at wildblue.net> wrote:
>> There is a VR-1 on almost every board in the radio. You have to know which one does what and that's outlined in the service manual.
>> Step one in the Voltage Adjustment on pg 68 shows that in the IF unit connector 10 pin 5 (incorrect it should be pin 1) is the measurement point and the adjustment point is VR-1 in the Control unit. The view on pg 80 shows CN10 to be behind the 8.8 filters and Pin 1 is shaded. On the Control unit VR-1 is by itself in the front right corner.
>> Clif Holland KA5IPF 
> www.avvid.com 
>>> ----- Original Message -----
> From: "Garey Barrell" <k4oah at mindspring.com>
> To: "Edward McCann" <edwmccann at yahoo.com>, "Kenwood" <kenwood at mailman.qth.net>
> Sent: Monday, February 29, 2016 3:15:21 PM
> Subject: Re: [Kenwood] WB8 WTU de AG6CX re:TS-940S Question
>> Ed -
>> I believe the 'buzzer' is the beep sound associated with key presses.
>> 'VR-1' is 'variable resistor' (trimpot) and is described in the service manual alignment 
> procedure(s). It is on the AVR board and happens to adjust the 28.5 VDC regulated voltage to 
> the PA.
>> --
> 73, Garey - K4OAH
> Rome, GA
>> Drake 2-B, 2-C/2-NT, 4-A, 4-B, C-Line
> and TR-4/C Service Supplement CDs
> <www.k4oah.com>
>> Edward McCann via Kenwood wrote:
>> Dennis:
>>>> Noted a question on this rig re: buzzer voltage some years ago.
>>>> Did anyone ever respond with what the "buzzer" is on the TS940S?
>>>> I haven't a clue!
>>>> Also an stymied by reference on p 50 of manual that advises adjusting RV voltage to 2.1 v with VR-1. Can't find a definition of "VR" let alone where the instruction book would have me measure the voltage.
>>>> You may have moved on to other rigs, but it would be very helpful if you happen to recall these arcane Kenwood moments!
>>>> Thanks,
>>>> Ed McCann
>> AG6CX
>> ______________________________________________________________
> Kenwood mailing list
> Home: http://mailman.qth.net/mailman/listinfo/kenwood
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:Kenwood at mailman.qth.net
>> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html