Topics

Lit switches.

Gary Robert Bosworth
 

On the front panel of most Tek 7000 series oscilloscopes are several pushbutton switches to select Vertical and Horizontal channels. They are usually grouped with the Vertical on the left side of the scope, and horizontal on the right. The buttons are translucent white to allow the selected switch button to glow bright. Most of these old scopes develop a problem of the switch not latching when you push them. The problem is usually due to small white plastic tabs from the back side of the button breaking off and falling to the rear of the switch where they will not allow the switch to be fully depressed. If you gently pull the buttons out to the front of the scope with a standard pliers, you will be able to look inside and see the trouble-making particles. All you have to do is use a toothpick to flick the little buggers out onto the tabletop, and the switch will be good as new. If all of the little tabs have broken off, and the button tends to fly out of the scope onto the table, all you need to do is apply a small amount of contact cement to the rear of the button in two places and it will adhere the button to the mating plastic that is the main working mechanism of the switch.

Dave Daniel
 

Some of the 7xxx-series 'scopes do not have illuminated mode switches.
In y collection, the 7904A and 7934 switches are not illuminated. The
7904 that I used to have does not have illuminated switches.

I had a different switch failure mode on my 7904A. The Vertical Mode
(left) switch assembly was not working. Pressing a button would not
release the currently-depressed button, and none of the buttons would
latch properly. I pulled everything apart and found that the switches
them selves consisted of sliding contact "carriers" that slid across the
PCB, and that one of these carriers had broken into several small
pieces, causing the switch to jam.

With the help of a list member (from whom I have not heard in a long
time), I was able to replace the broken carrier and repair the switch
assembly. This is where I also found out that Plastruct plastic welding
adhesive works well on certain kinds of plastic; I ended up with a
repaired contact carrier glued back together and a replacement carrier
as alternatives for repairing the switch assembly.

Somewhere I have a writeup on this which I created after I had the
'scope back in good working order.

DaveD

On 5/25/2017 7:34 PM, @grbosworth [TekScopes] wrote:

On the front panel of most Tek 7000 series oscilloscopes are several
pushbutton switches to select Vertical and Horizontal channels. They
are usually grouped with the Vertical on the left side of the scope,
and horizontal on the right. The buttons are translucent white to
allow the selected switch button to glow bright. Most of these old
scopes develop a problem of the switch not latching when you push
them. The problem is usually due to small white plastic tabs from the
back side of the button breaking off and falling to the rear of the
switch where they will not allow the switch to be fully depressed. If
you gently pull the buttons out to the front of the scope with a
standard pliers, you will be able to look inside and see the
trouble-making particles. All you have to do is use a toothpick to
flick the little buggers out onto the tabletop, and the switch will be
good as new. If all of the little tabs have broken off, and the button
tends to fly out of the scope onto the table, all you need to do is
apply a small amount of contact cement to the rear of the button in
two places and it will adhere the button to the mating plastic that is
the main working mechanism of the switch.

[Non-text portions of this message have been removed]

Adrian Nicol
 

As a newcomer to 7000 series 'scopes I was puzzled by the non-illumination of the buttons on my 7613 - especially when I saw a backplane pin (A9) assigned to '+5 Lights'!Turns out not all 'scopes support this but there is a Tek mod sheet 040-0686-01 that tells you how to add a 309K regulator running from the 8V supply in the PSU module to provide this function. I found it on Tekwiki but I think there is a thread somewhere on this group about it too.
I guess there are better and easier devices to fit these days, I will probably change to an adjustable one and set the voltage down a tad to prolong lamp life - getting to the switch to change a couple of them was, er, fun?

Adrian

On Friday, May 26, 2017 2:34 AM, "@grbosworth [TekScopes]" <TekScopes@...> wrote:


  On the front panel of most Tek 7000 series oscilloscopes are several pushbutton switches to select Vertical and Horizontal channels. They are usually grouped with the Vertical on the left side of the scope, and horizontal on the right. The buttons are translucent white to allow the selected switch button to glow bright. Most of these old scopes develop a problem of the switch not latching when you push them. The problem is usually due to small white plastic tabs from the back side of the button breaking off and falling to the rear of the switch where they will not allow the switch to be fully depressed. If you gently pull the buttons out to the front of the scope with a standard pliers, you will be able to look inside and see the trouble-making particles. All you have to do is use a toothpick to flick the little buggers out onto the tabletop, and the switch will be good as new. If all of the little tabs have broken off, and the button tends to fly out of the scope onto the table, all you need to do is apply a small amount of contact cement to the rear of the button in two places and it will adhere the button to the mating plastic that is the main working mechanism of the switch.

[Non-text portions of this message have been removed]

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Colin Herbert
 

I think the OP was concerning the illuminated switches on the mainframe, not the plug-ins. Or did I misunderstand?

Colin.



From: TekScopes@... [mailto:TekScopes@...]
Sent: 26 May 2017 16:55
To: TekScopes@...
Subject: Re: [TekScopes] Lit switches.





As a newcomer to 7000 series 'scopes I was puzzled by the non-illumination of the buttons on my 7613 - especially when I saw a backplane pin (A9) assigned to '+5 Lights'!Turns out not all 'scopes support this but there is a Tek mod sheet 040-0686-01 that tells you how to add a 309K regulator running from the 8V supply in the PSU module to provide this function. I found it on Tekwiki but I think there is a thread somewhere on this group about it too.
I guess there are better and easier devices to fit these days, I will probably change to an adjustable one and set the voltage down a tad to prolong lamp life - getting to the switch to change a couple of them was, er, fun?

Adrian

On Friday, May 26, 2017 2:34 AM, "@grbosworth [TekScopes] <mailto:@grbosworth%20[TekScopes]> " <TekScopes@...> wrote:


On the front panel of most Tek 7000 series oscilloscopes are several pushbutton switches to select Vertical and Horizontal channels. They are usually grouped with the Vertical on the left side of the scope, and horizontal on the right. The buttons are translucent white to allow the selected switch button to glow bright. Most of these old scopes develop a problem of the switch not latching when you push them. The problem is usually due to small white plastic tabs from the back side of the button breaking off and falling to the rear of the switch where they will not allow the switch to be fully depressed. If you gently pull the buttons out to the front of the scope with a standard pliers, you will be able to look inside and see the trouble-making particles. All you have to do is use a toothpick to flick the little buggers out onto the tabletop, and the switch will be good as new. If all of the little tabs have broken off, and the button tends to fly out of the scope onto the table, all you need to do is apply a small amount of contact cement to the rear of the button in two places and it will adhere the button to the mating plastic that is the main working mechanism of the switch.



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Chuck Harris
 

Tektronix was pretty proud of the 7000 series's
itty-bitty lit buttons, and on screen display, but
not all of tektronix's customers (US Government)
wanted to pay for the feature so they optionally
removed it.

Remember, HP was slow to adopt such things, and Tek
had to compete with them on price and function.

-Chuck Harris

Adrian Nicol fenland787a@... [TekScopes] wrote:

As a newcomer to 7000 series 'scopes I was puzzled by the non-illumination of the
buttons on my 7613 - especially when I saw a backplane pin (A9) assigned to '+5
Lights'!Turns out not all 'scopes support this but there is a Tek mod sheet
040-0686-01 that tells you how to add a 309K regulator running from the 8V supply
in the PSU module to provide this function. I found it on Tekwiki but I think
there is a thread somewhere on this group about it too. I guess there are better
and easier devices to fit these days, I will probably change to an adjustable one
and set the voltage down a tad to prolong lamp life - getting to the switch to
change a couple of them was, er, fun?

Adrian

David DiGiacomo
 

On Fri, May 26, 2017 at 10:12 AM, Chuck Harris <cfharris@...> wrote:
Tektronix was pretty proud of the 7000 series's
itty-bitty lit buttons, and on screen display, but
not all of tektronix's customers (US Government)
wanted to pay for the feature so they optionally
removed it.
You are mixing up 2 different things. Yes, there were options to
remove readout from mainframes and plugins. However, the reason the 3
slot scopes didn't have the lights power connected, was because of the
limited power budget. If the customer added the lights power kit, it
was assumed that they would use caution in configuring their scope
with plugins that wouldn't draw too much power.

John Gord
 

When my (non-illuminated) 7104 Vertical Mode switch interlock action failed, I took a sleazy way out: I removed the button springs and attached a small tape tab to the bottom of each button. I manually pull out one button before pushing in another.

--John Gord


---In TekScopes@..., <kc0wjn@...> wrote :

Some of the 7xxx-series 'scopes do not have illuminated mode switches.
In y collection, the 7904A and 7934 switches are not illuminated. The
7904 that I used to have does not have illuminated switches.

I had a different switch failure mode on my 7904A. The Vertical Mode
(left) switch assembly was not working. Pressing a button would not
release the currently-depressed button, and none of the buttons would
latch properly. I pulled everything apart and found that the switches
them selves consisted of sliding contact "carriers" that slid across the
PCB, and that one of these carriers had broken into several small
pieces, causing the switch to jam.

With the help of a list member (from whom I have not heard in a long
time), I was able to replace the broken carrier and repair the switch
assembly. This is where I also found out that Plastruct plastic welding
adhesive works well on certain kinds of plastic; I ended up with a
repaired contact carrier glued back together and a replacement carrier
as alternatives for repairing the switch assembly.

Somewhere I have a writeup on this which I created after I had the
'scope back in good working order.

DaveD

On 5/25/2017 7:34 PM, grbosworth@... mailto:grbosworth@... [TekScopes] wrote:
>
> On the front panel of most Tek 7000 series oscilloscopes are several
> pushbutton switches to select Vertical and Horizontal channels. They
> are usually grouped with the Vertical on the left side of the scope,
> and horizontal on the right. The buttons are translucent white to
> allow the selected switch button to glow bright. Most of these old
> scopes develop a problem of the switch not latching when you push
> them. The problem is usually due to small white plastic tabs from the
> back side of the button breaking off and falling to the rear of the
> switch where they will not allow the switch to be fully depressed. If
> you gently pull the buttons out to the front of the scope with a
> standard pliers, you will be able to look inside and see the
> trouble-making particles. All you have to do is use a toothpick to
> flick the little buggers out onto the tabletop, and the switch will be
> good as new. If all of the little tabs have broken off, and the button
> tends to fly out of the scope onto the table, all you need to do is
> apply a small amount of contact cement to the rear of the button in
> two places and it will adhere the button to the mating plastic that is
> the main working mechanism of the switch.
>
>
>
>



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