Re: Tek 2247A [SN B029000] Recap and diode part list ?


Darren Ting
 

Hi Mike,
Noted and thanks.
Maybe I should just leave them as it is.  Hard to find bipolar replacement. Hope those 20years old caps still can hold on

Sent from Yahoo Mail on Android

On Sat, 19 Mar, 2016 at 2:08, 2465bct@metachaos.net [TekScopes]<TekScopes@yahoogroups.com> wrote:  
Ting,

You cannot, as a general rule, replace a bipolar capacitor with a polarized
capacitor. Usually, the result is an exploding capacitor!

A bipolar capacitor is used because both positive and negative voltage
differentials are expected in a circuit. A polarized capacitor can only be
used when it is only possible for a positive voltage differential to exist (or
a negative, but then you just turn it around). Since bipolar capacitors are
more expensive than polarized capacitors, no design would have used one unless
absolutely necessary.

So, NO don't do that!

Mike

Hi David,
There are two Capacitors  A18C2204 and A18C2248
[CAP,FXD,ELCTLT:100UF,20%,63V] in this 2247A  using bi-polarized cap, does
it save to replace with normal polarized cap?
Any idea why need to use bi-polarized cap in PSU?
Hope to hear your advice

Thanks

From: "David davidwhess@gmail.com [TekScopes]" <TekScopes@yahoogroups.com>
To: TekScopes@yahoogroups.com
Sent: Tuesday, 15 March 2016, 10:48
Subject: Re: [TekScopes] Tek 2247A [SN B029000] Recap and diode part list ?

  I have no idea what the original diodes were other than fast recovery
rectifiers.

From the looks of the design, the MUR160G should work fine as a
replacement for all of them. It will not run any cooler however.

On Mon, 14 Mar 2016 22:18:53 +0000 (UTC), you wrote:
>>Hi David,
>>
>>Those diode belong to Hitachi V-1060 label as D1013,D1503,D1504,D1531,D1541.  All located at high voltage area.  
>>ALL mounted 2cm above PCB surface but still show overheating sign. This unit is Fan less and very basic without readout. 
>>Recently gwt another 2247A with much advance features. Plan to recap both and intent to upgrade those diode make it run cooler
>>
>> On Tue, 15 Mar, 2016 at 5:49, David davidwhess@gmail.com [TekScopes]<TekScopes@yahoogroups.com> wrote:
>>
>>What oscilloscope model and exactly which diode is this?
>>
>>On Mon, 14 Mar 2016 15:18:39 +0000 (UTC), you wrote:
>>
>>>Hi David
>>>
>>>Hope you can advice me on this for my another scope using diode AU01,AU01,RU3AMLF-B1 Base on service manual.
>>>Could all those replace with MUR160G as well?
>>>Because it look char and going to burn anytime 
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Best regards,
2465bct mailto:2465bct@metachaos.net

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