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I am looking at the schematics right now to trace the expected signal on pin 2 of U5020, according to the datashet pin2 of the MC14051 is X6 IN/OUT. I have some trouble reading the schematics ar misleading (at least to me).

I have attached a pic of the service manual, could someone tell me which is pin2 pls ? I guess it's DC 10 according to pin-out, but not sure..

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To: tekscopes@...
From: nosek75@...
Date: Thu, 30 Jan 2014 15:17:18 +0100
Subject: RE: [TekScopes] 2465b powered up, Error 76 Fail 01 - DMM option

Dave,

thanks for chiming in, just for the record, I just checked again, and the chip is MC14051 on both 2465 (non b) and 2465B - don't have a clue why I ordered something different...

The 76-01 is indeed the only failure, so I am with you... either the chip is bad, which I am doubting more and more, or pin 2 is not getting any input....

Should I order one and swap it out and then go from there ?

Max

To: TekScopes@...
From: manuals@...
Date: Thu, 30 Jan 2014 08:07:33 -0600
Subject: Re: [TekScopes] 2465b powered up, Error 76 Fail 01 - DMM option

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Max

According to 2465B Options Service info on? DMM 76-01 is? "Malfunction of DMM or if this is the only failure , V/F input Multiplexer U5020 Input pin 2" .

?So I guess it could also imply that pin2 is not getting a signal OR the chip is bad????

Dave
ArtekManuals

On 1/30/2014 7:49 AM, Maxime Nosek wrote:

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Hi All,

back after long time....

After reading the 2465 (non B) manual telling me that my error would be the U5020 chip going bad I ordered one according to the manual...

Now I have opened up my 2465b in order to change the chip but of here's the trouble:

U5020 on the 2465 with DMM option is a MC14052BCP (SP8T) according to the manual (and of coarse the one I ordered!) while the U5020 on the 2465b is a MC14051BCP (DP4T).

Now I am totally willing to order the correct chip, but would like to know if someone here has the manual for the DMM option on the 2465b and could confirm that error 76 fail 01 refers to the same U5020 ...

Any help is highly appreciated!

Max

To: tekscopes@...
From: nosek75@...
Date: Wed, 9 Jan 2013 00:06:07 +0000
Subject: RE: [TekScopes] Thanks to all! PSU recap worked, 2465b powered up, Error 76 Fail 01

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Well,
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I couldn't find a service manual?for the DMM option for the 2465B unit, only for the 2465!
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A copy is attached. I am pretty sure the DMM module is the same or at least very similar, if anyone here more info on this matter it's highly appreciated.
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Will check further what the U5020 chip is, as I don't have any further errors on start-up.
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Cheers,
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Max
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To: tekscopes@...
From: nosek75@...
Date: Tue, 8 Jan 2013 21:19:58 +0000
Subject: [TekScopes] Thanks to all! PSU recap worked, 2465b powered up, Error 76 Fail 01

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Hi all,

thanks a lot to all of you that helped me with my cap issue in the PSU of my tek 2465B scope.

After recapping the boards and touching up some dry solder joints the Scope powered up for the first time!

While I must say that working on the PCB is a real pleasure as far as built quality is concerned, assembling the unit is quite a pita...

After start-up it goes in diag mode and shows me "DM TEST 76 FAIL 01", I haven't checked any further for now, hope it's nothing serious!

Is that midi three-tone normal ?

Cheers,

Max

--
Dave
Manuals@...

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