221/Repairs: Difference between revisions

221/Repairs (view source)

271 bytes added , 19 October 2023

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Failed C714

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-(Common Problems)
+=Common Problems=
+==Failing PSU==
 The 221 has a switching power supply. It has
-a transformer couple trigger circuit which produces
+a transformer coupled trigger circuit which produces
-a Dc level base trigger.It gets fried when the batter
+a DC level base trigger. It gets fried when the battery
-gets so old they draw to much current
+gets old and draws too much current.<br>
+<br>
+More often than not, the T633 Transformer (part number [[120-0876-00]])
+is the thing to fail.<br>
-Regularly the T633 Transformer (part number [[120-0876-00]])
-is the problem on almost all of them.
+==Failed capacitors==
+[https://www.youtube.com/@justanotherelectronicsblog5490/videos justanotherelectronicsblog@YouTube] found C714 short when [https://www.youtube.com/watch?v=bZ6agALKXjs fixing his 221]
+[[Category:Instrument repair reports]]