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Re: tektronix 2445 help

 

How could?the discussion of this Tektronix 2445 repair be considered "clutter" to a Tektronix Scope Group?
No way, the discussion of this repair is a fantastic source of information and there isn?t problem at all to continue as an open source.
I seems a shame to take this discussion off?group because of one negative comment.
I agree, just ignore the negative comments and go on.
Regards, Carlos.

Em 07/07/2012 20:57, Tom Jobe < tomjobe@... > escreveu:

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Hi Tom,
How could?the discussion of this Tektronix 2445 repair be considered "clutter" to a Tektronix Scope Group?
I for one would like to read about what you guys are doing to fix this 2445.
Already you have both listed the U800 pin voltages found on your scopes, and you were working your way though the discrepancies between your voltage lists.
I seems a shame to take this discussion off?group because of one negative comment.
U800 problems are chronic on 24x5 scopes, so having the chance to see how knowledgeable people (such as yourself) attack the problem of identifying the actual problem is just too good to miss.
Please reconsider?taking this 2445 repair?discussion?off group!
tom jobe...

----- Original Message -----
From:
To:
Sent: Saturday, July 07, 2012 11:18 AM
Subject: Re: [TekScopes] Re: tektronix 2445 help

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The best price I have seen for the U800 chip is about $150 and they are hard to find. There is also the issue of an in experienced person safely removing a 24 pin dip in a multilayer board.
We are going to take the discussion offline so as to not clutter the group.
Tom
----- Original Message -----
From:
To:
Sent: Saturday, July 07, 2012 2:07 PM
Subject: RE: [TekScopes] Re: tektronix 2445 help

My take is the chip is bad because it has a piece of finger stuck to it? Buy a new chip sans finger and the scope will run again.
Rob
-----Original Message-----
From: [mailto:] On Behalf Of Alexandre Souza - Listas
Sent: Saturday, July 07, 2012 11:40 AM
To:
Subject: Re: [TekScopes] Re: tektronix 2445 help

3847K file just showing something useless? Wake up to life, Luciano! :oP Why can't you host the picture online or compress it better? :oP

---
Enviado do meu Motorola PT550
Meu site:

----- Original Message -----
From: "Lucianopep Luciano" <lucianopep@...>
To: <TekScopes@...>
Sent: Saturday, July 07, 2012 1:34 PM
Subject: Re: [TekScopes] Re: tektronix 2445 help [2 Attachments]

________________________________
Hello Tom photo 4193 pin 18 U800 pin 16 non have trace..and test point 59
pin 9 u 735 see Photo 4195 ..4196
Probe X1 set.

hi ..luciano :-)

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Can you put the good scope on U800 pins 18 (tp60), 16 (tp63), and test
point 59 (U735-9). Maybe take a quick picture of each.

The one measurement that has me puzzled is U800 pin 11. It is over 1.5
volts low and is a power input pin.

----- Original Message -- ---
>From: Lucianopep Luciano
>To: TekScopes@...
>Sent: Friday, July 06, 2012 6:32 PM
>Subject: Re: [TekScopes] Re: tektronix 2445 help
>
>
>
>
>
>
>
>________________________________
>
>Hello Tom What do you think? How about if I take once again the voltage
>all pins of U800
>and you send a photo as you set my Telk 2445?
>The values ??that I have highlighted are those that determine the fault?
>Thanks Tom. Luciano :-)
>
>
>?
>Here are the readings I get. I put them next to what you measured on your
>scope.
>
>
>pin 1 = -2,62 V -2.187
>pin 2= -1233mV +1.164
>pin3= +14,52 V +10.21
>pin4= +8,30V +38.7 - h or plate
>pin5= 0V 0
>pin 6= + 78,7V +84.3
>pin 7= +86,4V +86.3
>pin 8= + 76,4 V +60.3
>pin 9 =+73,7V +39.2 + hor plate
>pin10 = +15,01V +14.98
>pin 11= +3,95V +5.68 This one puzzles me. The measurement I got is what
>I would expect.
>pin12= +4,29V +4.27
>
>
>
>
>
>
>pin13=+7,90 mV +0.296
>pin 14= +4,96V +4.96
>pin 15= 0V 0
>pin 16= -1685mV -1.683
>pin17= +230mV -0.306
>pin18= -57,4mV -0.007
>pin19= +4,95V -4.98
>pin20= +24,7mV -.003
>pin21= -41,2mV -0.032
>pin 22= -1367mV +0 .035 H pos centered, yours is ok here.
>pin 23= 0V 0
>pin 24=+609mV -4.97 I need to review this one.
>
>
>
>>>
>
>

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