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DM501A/Repairs: Difference between revisions
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As the PT-100 is connected with only 2 wires, each sensor has to be trimmed with R1001 (offset). | As the PT-100 is connected with only 2 wires, each sensor has to be trimmed with R1001 (offset). | ||
==Switch Repair== | |||
The contact bar in switches can break. Replacing the contact bar and contacts can be done without desoldering the switches. | |||
Refer to the the pictures and the [[260-1971-00/Repairs| repair]] section of switch assembly [[260-1971-00]]. | |||
==R10 ([[307-1015-00]] input voltage divider) Repair== | |||
Fault pattern: V<sub>DC</sub>, V<sub>AC</sub> and resistance (exept the lowest range) are 2% to low. | |||
Fault: R10. Some resistors are to low (900 kΩ and 90 kΩ). The "stuff" inside has become liquid. The liquid has a low resistance. | |||
Solution: Open R10. Clean R10 inside with isopropanol and in a ultrasonic bath. | |||
==See Also== | |||
* [[Pushbutton switches]] | |||
==Pictures== | |||
<gallery> | |||
Tek-DM501A-rep-switch.jpg| Replace the push button plunger and spring contacts on a DM501A | |||
Tek-1260-1971-00-rep4.jpg| Defect push button plunger on top and new one below | |||
</gallery> | |||
[[Category:Instrument repair reports]] | [[Category:Instrument repair reports]] | ||