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Subject: Re: [PolySix] Non-working attenuator

From: Bob Grieb <bobgrieb@yahoo.com>
Date: 2014-12-23

There is another switch that is also driven by P10 etc. does
That one work correctly? If so, then the problem should be with D3.
You can unplug the connector on the 367 bd that goes to the
Front panel and check between the different pins for the
Diode connection in each position of the atten switch.
That will confirm that everything in the cable and front
Panel is OK. Also check continuity from that connector to
The pins on the 8048. Go right to the pin of the chip,
Not the pin on the pcb, so that the chip itself is getting
The signal. You said the attenuator doesnt work.
Could you be more specific? Does any position of the
Switch make a difference?


Bob

From: tuk88@rocketmail.com [PolySix] <PolySix@yahoogroups.com>;
To: <PolySix@yahoogroups.com>;
Subject: [PolySix] Non-working attenuator
Sent: Tue, Dec 23, 2014 7:53:36 AM

 

Hi everyone,

at first thank you for all these topics and knowledge which are very important for every polysix user (and repairer). With all these messages, the polysix will still live in some years :)

I post this topic due to my non-working attenuator. I'm pissed of by this one because I check everything I can (following differents topics found here).

At first the KLM-367 was changed by a clone. I build everything and the attenuator never worked with the new card. I don't know if it worked with the old acid eaten card.

- So, I checked P10, P11, P12, P13 and D03 conductivity, between KLM-370 and KLM-367. Everything is OK.

- I checked the presence of D03 on the different chips on KLM367. It's OK too.

- I checked the conductivity of P10, P11, P12 and P13, between connector of KLM 367 and 8048 uC. OK.

- D03 and the others are presents on CN10 of KLM367.

- Every diode of attenuator swich are OK.

- D03 signal seems to be OK.



So, now I'm lost...

Has anybody and idea, where does this issue can come from ?

Thank you a lot !

Lucas