Date   
Re: Replacing Power LED/light on TEK 2465BCT

satbeginner
 

Re: 465B Attenuator servicing

NigelP
 

OK I think we bottomed out the IPA bit but what I really need to know is quite specific to the mechanics of the assembly. I may not have seen everything about this in the manual but the small bit I read implied that in order to service the actual attenuator board I need to remove the complete assembly of BOTH CH1 & CH2 attenuators including the mode switch which seems to come out as a complete system.

However looking at the mechs (and I have serviced similar Tek cam switches before) it would seem possible to undo just a few threaded bushes and remove the attenuator board on its own off the cam assembly without having to remove the whole lot as I've mentioned above? I do know that on some cam switches, if you are not careful you end up with some no-longer-captive nuts which can easily get mislaid!! Forewarned is fore-armed! I don't think the manual has an exploded mechnical assembly diagram which would shed light on this methodology, but I may have missed it.

Re: Replacing Power LED/light on TEK 2465BCT

Chuck Harris
 

I had no idea the part wasn't tektronix made!

Very useful information!

-Chuck Harris

satbeginner wrote:

Re: 497p front panel cal failure (CF and Ref Lvl)

radioconnection@...
 

Well, it did it once, then repeated attempts failed. Would bad power supply bypass caps on the PC boards cause problems? I have a few caps that are open or high ESR, all are decoupling caps on the power supply rails on various boards. Parts on order, but won't be here until next week from Mouser. Power supply voltages are good, and I don't see appreciable noise or ripple.

Re: Replacing Power LED/light on TEK 2465BCT

oakley@...
 

Thanks for all of the responses.

Originally, I glanced at the green "legend" to the right of the ON/OFF mechanical aperture switch and assumed that I was seeing the front of a green LED sitting behind a windowed membrane. Now after looking closer, it's just a colored legend, so the repair or replacement of the green LED just got much easier ;-)

Although my scope appears to be operating quite close to specification, there were no visible calibration stickers on the unit to gauge how long since its last cal. Any recommendations for calibration of my scope (people, place, labs)?

Tom

Re: Replacing Power LED/light on TEK 2465BCT

John Ferguson
 

Where are you?

I ask because Chuck Harris calibrated one of my?? 2445Bs?? as well as re-capping the PS and fixing some other problems.?? I am happy with the result and the cost was fair.

He lives in Maryland.

From South Florida, shipping was $39 each way FedEx ground.?? I was fortunate to still have the box that scope had shipped in from my Ebay source.?? His packing job was well thought out and the box heavy duty. It's now made at least three trips and maybe two more if I decide to have my 2465 calibrated too.

John

On 5/25/19 3:10 PM, oakley@... wrote:
Thanks for all of the responses.

Originally, I glanced at the green "legend" to the right of the ON/OFF mechanical aperture switch and assumed that I was seeing the front of a green LED sitting behind a windowed membrane. Now after looking closer, it's just a colored legend, so the repair or replacement of the green LED just got much easier ;-)

Although my scope appears to be operating quite close to specification, there were no visible calibration stickers on the unit to gauge how long since its last cal. Any recommendations for calibration of my scope (people, place, labs)?

Tom


Re: Replacing Power LED/light on TEK 2465BCT

Tony Fleming
 

If you like a green LED in the POWER-PUSH-BUTTON, one could put one in, but
it is a lot of work!
Or one could just put a small opening somewhere near by and wire green LED
that is powered from the scope.....

On Sat, May 25, 2019 at 2:10 PM <oakley@...> wrote:

Thanks for all of the responses.

Originally, I glanced at the green "legend" to the right of the ON/OFF
mechanical aperture switch and assumed that I was seeing the front of a
green LED sitting behind a windowed membrane. Now after looking closer,
it's just a colored legend, so the repair or replacement of the green LED
just got much easier ;-)

Although my scope appears to be operating quite close to specification,
there were no visible calibration stickers on the unit to gauge how long
since its last cal. Any recommendations for calibration of my scope
(people, place, labs)?

Tom



Re: 494P problems - ROM and 1st LO

Sparky99
 

Hi John,

Thanks for your very helpful reply - I investigated and found all the ROM's in sockets - although judging by the solder splashes on the pins this was not how it left the factory. ROM 1 is located on the GPIB board, and re-seating this still yields the same error. I'll investigate more, and also check ko4bb.com, and if it nothing else works see if I can get a replacement GPIB board.

Julian

Re: 494P problems - ROM and 1st LO

radioconnection@...
 

Packaging 7854 scope for shipment?

Brad Thompson
 

Hello--

I'm thinking of offering my 7854 FS and I'd appreciate advice on packaging it
for survival  on shipment to U.S. addresses. IIRC, packing the plug-ins and
keyboard separately is advisable,  as is double-boxing the mainframe.
I'd plan on swaddling the scope in multiple layers of bubble-wrap, with a sheet
of resilient foam to protect the front panel.

Our local pack-and-ship store has a bad reputation. Has anyone successfully used a
commercial mover that offers pack-and-ship services?

If packing turns out to be a hassle, I'll list it for local pickup only.

Thanks in advance, and 73--

Brad  AA1IP
--
Sent from Postbox <https://www.postbox-inc.com>

Re: 494P problems - ROM and 1st LO

John Miles
 

Looks like there's a set of 494 images up there, all right. If the version #s don't match yours then you'll have to burn an entire set, but it sounds like someone has done you a favor (?) by installing sockets.

Of course, if someone else has replaced the ROMs, they may have done so in a failed attempt to fix the same error message. If so, it could indicate that the problem isn't really a bad ROM, but something else like an address decoder chip.

-- john, KE5FX

-----Original Message-----
From: TekScopes@groups.io [mailto:TekScopes@groups.io] On Behalf Of
radioconnection@...
Sent: Saturday, May 25, 2019 1:05 PM
To: TekScopes@groups.io
Subject: Re: [TekScopes] 494P problems - ROM and 1st LO

Any of these useful??

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

Re: 497p front panel cal failure (CF and Ref Lvl)

John Miles
 

Recap it, then follow the cal/adjustment procedure in the manual for the first LO and frequency control section and see how far you get.

-- john, KE5FX

-----Original Message-----
From: TekScopes@groups.io [mailto:TekScopes@groups.io] On Behalf Of
radioconnection@...
Sent: Saturday, May 25, 2019 11:19 AM
To: TekScopes@groups.io
Subject: Re: [TekScopes] 497p front panel cal failure (CF and Ref Lvl)

Well, it did it once, then repeated attempts failed. Would bad power supply
bypass caps on the PC boards cause problems? I have a few caps that are open
or high ESR, all are decoupling caps on the power supply rails on various
boards. Parts on order, but won't be here until next week from Mouser. Power
supply voltages are good, and I don't see appreciable noise or ripple.

Re: Packaging 7854 scope for shipment?

Tony Fleming
 

When I received mine it was bubble wrapped, that was in a box. Than a
second box that had a space about 1" or so around filled with the plastic
"peanuts" (for a lack of a better word). FedEx was great and no physical
damage was done to my scope!
I would use a heavier box on the outside and regular box inside. Insurance
is good also, so if something goes wrong.....

On Sat, May 25, 2019 at 3:24 PM Brad Thompson <brad.thompsonaa1ip@...>
wrote:

Hello--

I'm thinking of offering my 7854 FS and I'd appreciate advice on
packaging it
for survival on shipment to U.S. addresses. IIRC, packing the plug-ins and
keyboard separately is advisable, as is double-boxing the mainframe.
I'd plan on swaddling the scope in multiple layers of bubble-wrap, with
a sheet
of resilient foam to protect the front panel.

Our local pack-and-ship store has a bad reputation. Has anyone
successfully used a
commercial mover that offers pack-and-ship services?

If packing turns out to be a hassle, I'll list it for local pickup only.

Thanks in advance, and 73--

Brad AA1IP
--
Sent from Postbox <https://www.postbox-inc.com>



Re: Packaging 7854 scope for shipment?

Doug Bercich
 

Where are you located? (an approximation is fine)
Perhaps someone here on the list might be interested, and you’ll know it
went to a good home. ;-)

I absolutely adore my 7854!

I’d consider it just as a spare.

Best regards!

On Sat, May 25, 2019 at 3:24 PM Brad Thompson <brad.thompsonaa1ip@...>
wrote:

Hello--

I'm thinking of offering my 7854 FS and I'd appreciate advice on
packaging it
for survival on shipment to U.S. addresses. IIRC, packing the plug-ins and
keyboard separately is advisable, as is double-boxing the mainframe.
I'd plan on swaddling the scope in multiple layers of bubble-wrap, with
a sheet
of resilient foam to protect the front panel.

Our local pack-and-ship store has a bad reputation. Has anyone
successfully used a
commercial mover that offers pack-and-ship services?

If packing turns out to be a hassle, I'll list it for local pickup only.

Thanks in advance, and 73--

Brad AA1IP
--
Sent from Postbox <https://www.postbox-inc.com>



Re: Packaging 7854 scope for shipment?

redarlington
 

I'd ask a professional.

I'd also question anything they suggest that you think would not survive a
trip down a flight of stairs.

Really, pack it like you think it's going to be tossed down a flight of
stairs. Pack it so any internal boxes can't shift around and move up
against an external box or crate. The goal is to stop any impact on the
outside from reaching the scope.

If you think packing will cost more than the scope is worth, then don't
ship it (unless of course, somebody is willing to pay to do it right). I
suspect doing it "right" will cost well over $100 to ship a state or three
over.

You might get lucky with expanding foam packing around the scope, inside a
box, and then put that box inside a whole other box, and insulate it on all
sides with something that won't shift around.

Best of luck, and you might need it, and usually I have it when buying test
equipment.

-Bob N3XKB

On Sat, May 25, 2019 at 2:24 PM Brad Thompson <brad.thompsonaa1ip@...>
wrote:

Hello--

I'm thinking of offering my 7854 FS and I'd appreciate advice on
packaging it
for survival on shipment to U.S. addresses. IIRC, packing the plug-ins and
keyboard separately is advisable, as is double-boxing the mainframe.
I'd plan on swaddling the scope in multiple layers of bubble-wrap, with
a sheet
of resilient foam to protect the front panel.

Our local pack-and-ship store has a bad reputation. Has anyone
successfully used a
commercial mover that offers pack-and-ship services?

If packing turns out to be a hassle, I'll list it for local pickup only.

Thanks in advance, and 73--

Brad AA1IP
--
Sent from Postbox <https://www.postbox-inc.com>



Re: OT: App that keeps track of "Or Best Offer" auctions on eBay to tell you what a seller will accept.

Kevin Oconnor
 

@Jim Potter
I should have been clearer. What I meant was that, as a competitor trying to figure out what an item sold for and to price the same or similar item, past fixed price sales are misleading. An item may routinely sell for 25% of the fixed price listing through offers and you will never know that ( the opaque part). The discount seller can suppress competition this way.
I also see numerous sellers with outrageous shipping and undervalued fixed pricing. Since FVF does not include shipping, their skirt the eBay fee structure but still make a hefty profit if there is ever a buyer. This is against eBay policy, but they don’t do anything about it.
K

Re: "Volts/Div" knob for Tek 2235 needed [ Tek part No : 366-2148-01]

donald collie
 

Thankyou Tom, i`ll drop him a line..................Don

On Sat, May 25, 2019 at 6:43 PM tom jobe <tomjobe@...> wrote:

One of the members of Tekscopes makes new replacement volt/div knob
skirts for the 2235. I have bought some of them from him and they are
very nice.
He also carries some hard to find good used/tested parts for the 2235
such as the main transformer (T948?), the high voltage multiplier
(U975?), etc.
This link shows what he has in stock for sale on eBay at the moment, he
must be out of those 2235 knob skirts temporarily.

https://www.ebay.com/sch/shockcore/m.html?item=273836542787&hash=item3fc1ee0b43%3Ag%3AHUcAAOSwZQRYf5YX&rt=nc&_trksid=p2047675.l2562
He is a great guy to do business with as his 100% eBay customer
satisfaction rating shows.
I have bought several sets of his new replacement 2235 volt/div knob
skirts and they work perfectly.
About he only way you can make a mess of the knob skirt replacement is
to use too much glue.
A few very tiny dabs of glue/epoxy at the smallest diameter of the knob
register is all you need, and there is a notch that orients the skirt to
the knob just like the original had.
The member name he uses on Tekscopes escapes me at the moment, but you
can contact him through any of his eBay auction pages such as this page
for his 2235 main transformers.

https://www.ebay.com/itm/Tektronix-120-1601-01-SwitchmodeTransformer-for-2213A-2215A-2235-Oscilloscope/273836542796?hash=item3fc1ee0b4c:g:bAQAAOSwnrJbfX~4
tom jobe...








On 5/24/2019 9:44 PM, donald collie wrote:
I only really need the clear plastic skirt on this knob [minimum], or two
complete knobs [maximum], as I can probably repair the other one, which
has
a cracked skirt. Willing to pay for these. Probably also used on other
22xx
types.
Also : I replaced the chopper MOSFET in the psu with a NZ$1-60 generic
type. It gets very hot to my way of thinking - too hot to hold your
finger
on the heatsink near it- does anyone know if an exact replacement is
necessary - perhaps a faster type with lower losses. The MOSFET`s molex
socket shows signs of being quite hot over some time [browning]
Thankyou in anticipation for your
reply.........................................................Donald
ZL4GX





Re: Replacing Power LED/light on TEK 2465BCT

Alberto I2PHD
 

On 2019-05-25 16:12, Dan Rae via Groups.Io wrote:

And the Hours counter can be set to
zero or any number you like as part of the calibration process, so...
How can I make my 2465B display the hours count ? Are the debug commands of the firmware listed somewhere ?

TNX

--
/*73 Alberto I2PHD*
<<< http://www.weaksignals.com >>>/

How do posts make it to the email list

Kevin Oconnor
 

I have been on this list for a long time. It just dawned on me that there are aspects about it I don’t understand. How can there be a reply to my specific post within the same email digest that my post was published in? (Same digest #) Doesn’t it have to be published, then read, then replied to in another digest?
Kevin

Re: How do posts make it to the email list

keantoken
 

You can choose to receive messages in a digest or individually. If you receive them individually, you get them as soon as they're posted. If you choose digest, you get them all at once at whatever interval the digest is set to.

On Saturday, May 25, 2019, 4:55:30 PM CDT, Kevin Oconnor <@KO3Y> wrote:

I have been on this list for a long time. It just dawned on me that there are aspects about it I don’t understand. How can there be a reply to my specific post within the same email digest that my post was published in? (Same digest #) Doesn’t it have to be published, then read, then replied to in another digest?
Kevin