260-1971-00/Repairs: Difference between revisions

Latest revision as of 06:07, 24 May 2021

Repair of push switches

Tektronix push switches like 260-1971-00 can fail when the end of the green plunger breaks, releasing the contact springs of the last 2 poles.

In that case the repair can be done even when mounted to PCBs, see repair section of DM501A.

Disassembling the Push Button

Remove spring retaining ring and spring.

Push and hold the latching bar with a small screw driver or toothpick and push in the green plunger slowly and carefully to be able to take away the contact springs. Otherwise the contacts might jump out of the pockets.

Assembling the Push Button

Slide in the green plunger with the rear holder pin in the right position until the the first two spring contact pockets reach the end of the push button housing.

Place spring contacts on both sides in the pocket with round edges facing away from the green plunger.

Hold the spring contact and push in the green plunger further util the next contact pockets are in place.

When the green plunger gets stuck while pushing in, push and hold the latching bar with a toothpick.

When all contact springs are in place and the green plunger is fully pushed inside the button housing, place spring and spring retaining ring on the green plunger.

Pictures

Dissasembling - Latching bar marked with red arrows
Removed left plunger and visible latching bar
Plunger with spring contacts in the contact pockets
Defect plunger on top and new plunger below
Example on how to replace the plunger in a DM501A

@@ Line 1: / Line 1: @@
 ==Repair of push switches==
-Tektronix push switches like 260-1971-00 can fail when the end of the green push bar breaks, releasing the contact springs of the last 2 poles.
+Tektronix push switches like 260-1971-00 can fail when the end of the green plunger breaks, releasing the contact springs of the last 2 poles.
 In that case the repair can be done even when mounted to PCBs, see repair section of DM501A.
-==Disassembling The Push Button==
+==Disassembling the Push Button==
- Remove spring retaining ring and spring.
+:Remove spring retaining ring and spring.
- Push and hold the locking bar with a small screw driver or toothpick and push in the green contact bar slowly and carefully to be able to take away the contact springs. Otherwise the contacts might jump out of the holders.
+:Push and hold the latching bar with a small screw driver or toothpick and push in the green plunger slowly and carefully to be able to take away the contact springs. Otherwise the contacts might jump out of the pockets.
-==Assembling The Push Button==
+==Assembling the Push Button==
- Slide in the green contact bar with the rear holder pin in the right position until the the first two spring contact pockets reach the end of the push button housing.
+:Slide in the green plunger with the rear holder pin in the right position until the the first two spring contact pockets reach the end of the push button housing.
- Place spring contacts on both sides in the pocket with round edges facing away from the green contact bar.
+:Place spring contacts on both sides in the pocket with round edges facing away from the green plunger.
- Hold the spring contact and push in the green contact bar further util the next contact pockets are in place.
+:Hold the spring contact and push in the green plunger further util the next contact pockets are in place.
- When the green contact bar gets stuck while pushing in, push and hold the locking bar with a toothpick.
+:When the green plunger gets stuck while pushing in, push and hold the latching bar with a toothpick.
- When all contact springs are in place and the green contact bar is fully pushed inside the button housing, place spring and spring retaining ring on the green contact bar.
+:When all contact springs are in place and the green plunger is fully pushed inside the button housing, place spring and spring retaining ring on the green plunger.
+==See Also==
+* [[Pushbutton switches]]
 ==Pictures==
 <gallery>
-Tek-260-1971-00-rep1.jpg | Dissasembling - locking bar marked with red arrows
+Tek-260-1971-00-rep1.jpg | Dissasembling - Latching bar marked with red arrows
-Tek-260-1971-00-rep2.jpg | Removed left contact bar and visible locking bar
+Tek-260-1971-00-rep2.jpg | Removed left plunger and visible latching bar
-Tek-260-1971-00-rep3.jpg | Contact bar with spring contacts in the contact pockets
+Tek-260-1971-00-rep3.jpg | Plunger with spring contacts in the contact pockets
-Tek-1260-1971-00-rep4.jpg | Defect contact bar on top and original contact bar below
+Tek-1260-1971-00-rep4.jpg | Defect plunger on top and new plunger below
-Tek-DM501A-rep-switch.jpg |Example on how to replace the contact bar in a [[DM501A]]
+Tek-DM501A-rep-switch.jpg |Example on how to replace the plunger in a [[DM501A]]
 </gallery>
+[[Category:Instrument repair reports]]