Author Topic: Tektronix 2465B PSU tips?  (Read 310 times)

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Offline jonpaul

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Tektronix 2465B PSU tips?
« on: August 15, 2019, 03:29:11 pm »
Bonjour to all:

Have a late SN 2465B with bad power supply.
Any advise appreciated:

Pitfalls in removing it?
 Dummy load to debug?
Will it run with just a few loads connected?
Besides usual lytics and X2 caps, other parts (power res, power diodes, transistors) prone to fail?
Recent BOM for recapping?

MANY THANKS

Jon
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Online tautech

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Re: Tektronix 2465B PSU tips?
« Reply #1 on: August 16, 2019, 08:42:22 am »
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Offline jonpaul

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Re: Tektronix 2465B PSU tips?
« Reply #2 on: August 17, 2019, 09:47:27 am »
Bonjour TauTech:  I know the 2465B teardown thread very well.
It is now 61 pages back to 2011.

But our forum search does not provide a search in a thread capability.

Can you please mention the pages or post numbers in the enormous thread which highlight PSU removal and troubleshooting?

Many Thanks

Jon
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Re: Tektronix 2465B PSU tips?
« Reply #3 on: August 17, 2019, 09:54:38 am »
Bonjour TauTech:  I know the 2465B teardown thread very well.
It is now 61 pages back to 2011.

But our forum search does not provide a search in a thread capability.
Oh yes it does !
Open topic and use Search box at top right of page.
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Online tautech

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Re: Tektronix 2465B PSU tips?
« Reply #4 on: August 18, 2019, 12:14:37 am »
PSU posts around #180
As always the leaking SMD caps particularly on the A5 PCB need addressing with care to fix any corroded traces nearby.
Post #380 mentions damage to a SMD resistor possibly caused be leaking caps.
Post #403 is worth a look.
Others of note:
425
460
464
Page 20
P21
537
566
569
572
594-605
611
648
656
682
687
689
829
840
845
860
870
874
973
1050
1091-1096
1163
1170-1173
To P50, more as I get time.
1281
1270-1314
1329-1332
1441
1515
« Last Edit: August 18, 2019, 07:55:00 am by tautech »
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Offline med6753

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Re: Tektronix 2465B PSU tips?
« Reply #5 on: August 18, 2019, 12:32:06 am »
PSU removal and re-cap:

https://www.eevblog.com/forum/testgear/tektronix-2465b-oscilloscope-teardown/msg1658102/#msg1658102


Inventory of parts required to perform the re-cap in the attachment.
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Offline jonpaul

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Re: Tektronix 2465B PSU tips?
« Reply #6 on: August 18, 2019, 10:37:22 am »
Bonjour and many thanks for the notes, exactly what I needed. The teardown thread is massive

Re A5 SMD lytics leak damage I have fixed 3 units.  NVRAMs replaced and in process of CAL, one is finished.

The PSUs on  4 units on my bench are fine, I am expecting to receive the bad PSU 2465B next week.
I have not worked on the 2465B PSU before so this will be a new challenge. This unit has A5 reworked but besides PSU the NVRAM is dead and it needs CAL.

Will update as work proceeds.

Jon

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