Date   

Looking for a good, late R7603

Bill Perkins
 

I'm after a late R7603 and am in no hurry. I want one with a fan. I'm about to buy some service info so will be better able to spec what I think I want.

How. ever. there must be 50 people here who know far better than I so any and all info is welcome.

TIA
Bill @ PEARL-Inc.


Re: 2215 CRT problem, PSU filtering?

 

Hi Max,

I guess you mean A10, the main board. At least on my schematic.

Anyway, do you have access to an ESR meter? That would be a little easier than a shotgun approach.

But here are the caps to look at:

C937 1800 uF/ 75 V

C961 33 uF/ 160 V

C965 270 uF/ 40 V

C971, 972, 975, 976, 985    840 uF/ 12 V

Be sure to use caps from a reliable source. Avoid the china caps or ebay.


Have you checked the tightness for all the PC board mounting hardware?


Any way, good luck. Being in 50Hz land the RIFA caps should be the first step. Be sure to use safety caps.

Regards,

Tom

On 6/28/2020 6:22 PM, Maxsimmonds1337@... wrote:
Hey Tom,

Thanks for replying. I don't have any LED lights but I do have a florescence one (but that's spitting out crap at 50Hz so I assume it's fine). Either way, I took the scope to another room in the house and it's still the same. In fact, I'm facing a very similar problem to what's outlined here - https://groups.io/g/TekScopes/topic/7638108

I checked the grounding on the CRT tube, the resistance from the earth pin to the top of the tube, and it was in the order of ohms, so I cleaned up the ground clip contact, it reduced the resistance to sub-ohm, but this did not help.

So, I guess I had better start replacing some caps, the rifa ones looked cracked, so I'll start with these. The PSU filtering caps, are they all on A18?

Thanks again!

Max

--
This email has been checked for viruses by Avast antivirus software.
https://www.avast.com/antivirus


Re: Tek Purchased Power Supplies, Power One

 

REALLY??? You should know better!
The next time, before you ask 8,000 members from TekScopes for the answer to this trivial question, first try going to google. Type one word in the search field
tekwiki

The VERY FIRST HIT is the answer you seek
Dennis Tillman W7pF

-----Original Message-----
From: TekScopes@groups.io [mailto:TekScopes@groups.io] On Behalf Of Gary Robert Bosworth
Sent: Sunday, June 28, 2020 5:51 PM
To: TekScopes@groups io <TekScopes@groups.io>
Subject: Re: [TekScopes] Tek Purchased Power Supplies, Power One

How do I get to Tekwiki?


On Sun, Jun 28, 2020 at 1:36 PM Craig via groups.io <craigyard99= yahoo.com@groups.io> wrote:

Schematics for Tek part numbers 119-1303-00 and 119-1304-00 are now
archived on Tekwiki (Thank you Kurt).

These were purchased Power One supplies that are listed in Common
design Catalog 6 section 12-2.

Search Power One on Tekwiki.

I remember Power One being mentioned recently, maybe this will help
someone.

Best Regards to all,

Craig




--
Gary Robert Bosworth
@grbosworth
Tel: 310-317-2247





--
Dennis Tillman W7pF
TekScopes Moderator


Re: Tektronix 2230

Saroj Pradhan
 

Hi Leo
I made myself a old style transformer type power supply to connect to the
inverter section. Here are my findings.
1. Un loaded external power supply out put voltage---44v
2. Loaded external power supply voltage--- 38.7v
3. Got the trace.
4. Front panel knobs have effect.
5. Fan doesn't rotate.
6. Measured out put voltages at low voltage side which are
+7.7v at +8.6v
- 7.66v at - 8.6v
+ 4.58 at +5v
- 4.46v at - 5v
+91v at +100v
+26.9v at +30v
7 collector voltage of Q946 and Q947 is 37.6v
8 base voltage of Q946 and Q947 is 0.5v
9 voltage across R949 is 0. 85v which gives around 1.66A current at
emitter of Q946 and Q947. I think that is quite normal.
10 text in the screen wobbles.
11 I can see some noises on the trace and is significant in 2mv/div
12 put on the equipment for 30 minutes
Q946 and Q947 were hot but I could touch them.

What will be the cause of out of spec voltages at low voltage side. Low
voltage at tp950(38v) makes so much difference.
Check the fan motor with external 10v supply, the fan motor gives initial
torque but does not spin and draws nearly 500mA.
It seems some has already replaced Q947 and q946.
Please advise me what shall be my next step.
Thank you very very much for your time and suggestion. At least I could
conclude that there is no dead short in the inverter section.

Regards
Saroj

On Sun, Jun 28, 2020, 1:00 PM Saroj Pradhan via groups.io <sarojman.Pradhan=
gmail.com@groups.io> wrote:

Hi satbeginner
Thank you for good suggestion.
I will find some suitable diode for cr907 and replace. By theime I am
looking for a power supply to connect to the inverter. I will get back to
you after I get and test the inverter.
Saroj




Re: Tektronix transformers question

 

Bob,
Please include a way to reach you and request that people contact you off list.
Dennis Tillman W7pF

-----Original Message-----
From: TekScopes@groups.io [mailto:TekScopes@groups.io] On Behalf Of Bob Albert via groups.io
Sent: Sunday, June 28, 2020 12:41 PM
To: tekscopes@groups.io; TekScopes@groups.io
Subject: Re: [TekScopes] Tektronix transformers question

I have a transformer salvaged from a 465B I think. If interested let me know.
Bob
On Sunday, June 28, 2020, 12:32:59 PM PDT, Albert Otten <aodiversen@...> wrote:

Hello Thomas,

Often a simple Google search for the part number brings you further, for instance 465(A) for the first transformer.
A lot of info can be found at Tekwiki, http://w140.com/tekwiki/wiki/Reference_material . For instance the IC has been used in 485, 7704(A) and some other scopes according to Tektronix_Integrated_Circuit_and_Hybrid_Circuit_Catalog.pdf.

Albert







--
Dennis Tillman W7pF
TekScopes Moderator


Re: What is the differences between Tek P6021 and TCP202 current probes?

Daniel Lu
 

Thank you! I will have A6302 a check!


Re: What is the differences between Tek P6021 and TCP202 current probes?

Daniel Lu
 

Thank you Mark, these are very useful information!


Re: Tek Purchased Power Supplies, Power One

Roy Morgan
 

On Jun 28, 2020, at 8:51 PM, Gary Robert Bosworth <@grbosworth> wrote:

How do I get to Tekwiki?
Click this link:

http://w140.com/tekwiki/wiki/Main_Page



Roy Morgan
K1LKY since 1958
k1lky68@...


Re: Tek Purchased Power Supplies, Power One

Gary Robert Bosworth
 

How do I get to Tekwiki?


On Sun, Jun 28, 2020 at 1:36 PM Craig via groups.io <craigyard99=
yahoo.com@groups.io> wrote:

Schematics for Tek part numbers 119-1303-00 and 119-1304-00 are now
archived on Tekwiki (Thank you Kurt).

These were purchased Power One supplies that are listed in Common design
Catalog 6 section 12-2.

Search Power One on Tekwiki.

I remember Power One being mentioned recently, maybe this will help
someone.

Best Regards to all,

Craig




--
Gary Robert Bosworth
@grbosworth
Tel: 310-317-2247


Re: Tektronix transformers question

momemeca
 

Hello Michael,
Along the same line of enquiry ... 120-0117-00?
I have one of those on my spares shelf but the assignment label on it fell off and I no longer know what it belongs to :-(
Also ... What is the Tektronix RPR Catalog and can I access it On-Line?

Many thanks and best regards,

Rick

On 29 Jun 2020, at 10:37, Michael W. Lynch via groups.io <mlynch003=yahoo.com@groups.io> wrote:

On Sun, Jun 28, 2020 at 08:39 AM, Thomas S. Knutsen wrote:


I have come into some Tektrinix transformers new in box, and are wondering
what they may be for. The parts no. is:

120-0800-01
120-0471-00
Per Tektronix RPR Catalog:

120-0471-00 is a Power Transformer for 453 and 454 scopes

--
Michael Lynch
Dardanelle, Arkansas



Re: Tektronix transformers question

Michael W. Lynch
 

On Sun, Jun 28, 2020 at 08:39 AM, Thomas S. Knutsen wrote:


I have come into some Tektrinix transformers new in box, and are wondering
what they may be for. The parts no. is:

120-0800-01
120-0471-00
Per Tektronix RPR Catalog:

120-0471-00 is a Power Transformer for 453 and 454 scopes

--
Michael Lynch
Dardanelle, Arkansas


Re: (OT) repair tools: Autotransformers/variacs

 

On Sun, Jun 28, 2020 at 09:44 AM, mosaicmerc wrote:


nteresting...I did use my (3 year old) Variac last year to develop  a thermal
sensor/display circuit for 3 phase bus-bars in electrical panel/switchgear.
The circuit had to be low current, compact and  have good heat tolerance
being in an enclosed panel. So I designed a transformer less, capacitive
coupled  power supply that was viable from 110VAC thru 330VAC . My Variac 
is a 0-130VAC unit, so I also used a 1:3 transformer  salvaged from some old
gear to step up the test voltages.
Interesting... I did use my variac to implement an inexpensive variable HV DC supply, with three diodes and three capacitors forming a rectifier / tripler, able to go from zero to over 500 VDC.
I used this to regenerate the electrolytic caps in my old 547 scope, after disconnecting them from their circuits.
This arrangement can also make a wife a widow if not used carefully, but so is everything inside a 500 series oscilloscope.

Ernesto


FS: Tek R7903 service manual $12 shipped to US -- rev C MAR 1978

John Griessen
 

This can go media mail, shipping included in price. Has change notices in back from JUN 1978.

--
John Griessen


Re: 2215 CRT problem, PSU filtering?

Maxsimmonds1337@...
 

Hey Tom,

Thanks for replying. I don't have any LED lights but I do have a florescence one (but that's spitting out crap at 50Hz so I assume it's fine). Either way, I took the scope to another room in the house and it's still the same. In fact, I'm facing a very similar problem to what's outlined here - https://groups.io/g/TekScopes/topic/7638108

I checked the grounding on the CRT tube, the resistance from the earth pin to the top of the tube, and it was in the order of ohms, so I cleaned up the ground clip contact, it reduced the resistance to sub-ohm, but this did not help.

So, I guess I had better start replacing some caps, the rifa ones looked cracked, so I'll start with these. The PSU filtering caps, are they all on A18?

Thanks again!

Max


Re: Tektronix transformers question

snapdiode
 

Sphere is a good place.

https://www.sphere.bc.ca/test/tek-transformers.html#catalog

Might not have everything listed but it's a start.


Tek Purchased Power Supplies, Power One

Craig
 

Schematics for Tek part numbers 119-1303-00 and 119-1304-00 are now archived on Tekwiki (Thank you Kurt).

These were purchased Power One supplies that are listed in Common design Catalog 6 section 12-2.

Search Power One on Tekwiki.

I remember Power One being mentioned recently, maybe this will help someone.

Best Regards to all,

Craig


Re: Tektronix transformers question

Bob Albert
 

I have a transformer salvaged from a 465B I think.  If interested let me know.
Bob

On Sunday, June 28, 2020, 12:32:59 PM PDT, Albert Otten <aodiversen@...> wrote:

Hello Thomas,

Often a simple Google search for the part number brings you further, for instance 465(A) for the first transformer.
A lot of info can be found at Tekwiki, http://w140.com/tekwiki/wiki/Reference_material . For instance the IC has been used in 485, 7704(A) and some other scopes according to Tektronix_Integrated_Circuit_and_Hybrid_Circuit_Catalog.pdf.

Albert


Re: Tektronix transformers question

Albert Otten
 

Hello Thomas,

Often a simple Google search for the part number brings you further, for instance 465(A) for the first transformer.
A lot of info can be found at Tekwiki, http://w140.com/tekwiki/wiki/Reference_material . For instance the IC has been used in 485, 7704(A) and some other scopes according to Tektronix_Integrated_Circuit_and_Hybrid_Circuit_Catalog.pdf.

Albert


Re: TDS7104 hard disk dead and blank screen

joeschm@...
 

Has anyone had any success cloning the harddrive in the tds7104?

I have tried a few options including a raw clone using clonezilla. I tell it specifically to clone the boot record. The disk image looks good but the tds7104 can't find the OS.

Any thoughts would be greatly appreciated.

Thanks


Re: (OT) repair tools: Autotransformers/variacs

mosaicmerc
 

Interesting...I did use my (3 year old) Variac last year to develop  a thermal sensor/display circuit for 3 phase bus-bars in electrical panel/switchgear. The circuit had to be low current, compact and  have good heat tolerance being in an enclosed panel. So I designed a transformer less, capacitive coupled  power supply that was viable from 110VAC thru 330VAC . My Variac  is a 0-130VAC unit, so I also used a 1:3 transformer  salvaged from some old gear to step up the test voltages.