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Tek scope 2232 has died....

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Rinus Leeuw

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Mar 15, 2000, 3:00:00 AM3/15/00
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Hello

I have a tektronix digital storage oscilloscope which died.

Tektronix over here in Holland say: it's on his service-end and so not
repairable anymore.

So i took the advantage and opent it myself. The primaire power stage has
blown. It is a component marked: P6N55 by Motorola, so it the part number
would be: MTP6N55

After a while on the Internet I found something. It looks like P5N60. Is
this Power MOSFet replace-able by this one?

Can anyone give me an answer please? The scope is build in 1991, and has
lost his service in 1998. It seems to me to soon. Also Tektronix even have
problems to find their own servicemanual.... For those who knows, it handles
about Q901.

Thanx in advance!

Greetings,
Rinus Leeuw e-mail: Rin...@BigFoot.com


Jim Yanik

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Mar 15, 2000, 3:00:00 AM3/15/00
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In article <8aol11$ahe$1...@azure.nl.gxn.net>, Ri...@4leeuwen.tmfweb.nl says...
the FET you mention had a high failure rate. One mod that was implemented was
to remove the connector that plugs onto the FET,and solder the wires to the FET
directly. Also,the Electrolytics are likely showing high ESR,and causing a
higher PS dissipation.Here's spme TEK FET specs;


151-1136-00 MTP12N10E 100V 0.16ohm 14.0A
151-1141-00 IRF730,STP300H 400V 1.0 ohm 5.5A
151-1151-00 IRF710/MTP3N40 400V 3.6 ohm 1.5A
151-1152-00 IRF820/MTP475 500V 3.0 ohm 2.5A
151-1171-00 BUZ71A/MTP15N05E 50V 0.12ohm 14 A
151-1214-01 IRF830 500V 1.5 ohm 4.5A
151-1245-00 MTP6N60E 600V 1.2 ohm 6.0A
151-1286-00 MTP4N80E/BUK456-800 800V 3.0ohm 4.0A

You need to find a FET with equal or higher V,and a lower R,and equal or higher
current capability.I compiled these specs while I worked at TEK.

Jim Yanik,NRA member


Rinus Leeuw

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Mar 20, 2000, 3:00:00 AM3/20/00
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Jim Yanik heeft geschreven in bericht ...

|the FET you mention had a high failure rate. One mod that was implemented
was
|to remove the connector that plugs onto the FET,and solder the wires to the
FET
|directly. Also,the Electrolytics are likely showing high ESR,and causing a
|higher PS dissipation.Here's spme TEK FET specs;
|
|
| 151-1136-00 MTP12N10E 100V 0.16ohm 14.0A
| 151-1141-00 IRF730,STP300H 400V 1.0 ohm 5.5A
| 151-1151-00 IRF710/MTP3N40 400V 3.6 ohm 1.5A
| 151-1152-00 IRF820/MTP475 500V 3.0 ohm 2.5A
| 151-1171-00 BUZ71A/MTP15N05E 50V 0.12ohm 14 A
| 151-1214-01 IRF830 500V 1.5 ohm 4.5A
| 151-1245-00 MTP6N60E 600V 1.2 ohm 6.0A
| 151-1286-00 MTP4N80E/BUK456-800 800V 3.0ohm 4.0A
|
|You need to find a FET with equal or higher V,and a lower R,and equal or
higher
| current capability.I compiled these specs while I worked at TEK.
|
|Jim Yanik,NRA member
|

Thanx, I replace the FET with a BUZ91A (commonly available here) and it
works great now! I did replace all the electrolytics in the pwersupply.

Greetings


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