36,230
edits
No edit summary |
No edit summary |
||
(5 intermediate revisions by 2 users not shown) | |||
Line 1: | Line 1: | ||
Cam switches are used in many Tek instruments, particularly in [[7000-series plug-ins]], but also in 400-series portable scopes. | '''Cam switches''' are used in many Tek instruments, particularly in [[7000-series plug-ins]], but also in [[TM500]] equipment and 400-series portable scopes. | ||
The lobes on the rotary cam encode the lookup table of which contacts should be open or closed in each rotational position of the shaft, | The lobes on the rotary cam encode the lookup table of which contacts should be open or closed in each rotational position of the shaft, | ||
which is typically rotated by a knob on the front panel of the instrument. | which is typically rotated by a knob on the front panel of the instrument. | ||
A benefit of this design is low parasitics compared to traditional rotary wafer switches. | A benefit of this design is low parasitics compared to traditional rotary wafer switches. | ||
For cleaning, Tek recommends swiping paper soaked in isopropyl alcohol between the contacts and pads. | |||
==Maintenance== | ==Maintenance== | ||
* [http://hakanh.com/dl/docs/kitinstructions/040-0541-00.pdf 040-0541-00: Cam switch repair kit (1970)] | * [http://hakanh.com/dl/docs/kitinstructions/040-0541-00.pdf 040-0541-00: Cam switch repair kit (1970)] | ||
* [[Media:Tekscope 1977 V9 N1.pdf | TekScope Vol. 9 No. 1, 1977]] p.14: Cam switch cleaning tips | |||
==Pictures== | ==Pictures== | ||
<gallery> | <gallery> | ||
Tek 7a19 frontright.jpg|Cam switch in [[7A19]] | Tek 7a19 frontright.jpg | Cam switch in [[7A19]] | ||
Tek 7a19 rearright.jpg|Cam switch in [[7A19]] | Tek 7a19 rearright.jpg | Cam switch in [[7A19]] | ||
Tek 7a19 att sw3.jpg|Cam switch in [[7A19]], contact fingers | Tek 7a19 att sw3.jpg | Cam switch in [[7A19]], contact fingers (isolated from spring lever) | ||
Cam-01.jpg | Cam switch with contacts on both sides of the PCB ([[7D15]]) | |||
Cam-02.jpg | 7D15 double-sided switch | |||
Cam-03.jpg | 7D15 double-sided switch | |||
Cam-04.jpg | 7D15 double-sided switch, bottom-side contacts | |||
Cam-05.jpg | 7D15 double-sided switch, through-board pins | |||
Tek cam switch cam.jpg | |||
</gallery> | </gallery> | ||
[[Category:Repair issues]] | [[Category:Repair issues]] | ||
[[Category:Electromechanical components]] |