221/Repairs: Difference between revisions

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The 221 has a switching power supply. It has
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>
Regularly the T633 Transformer (part number [[120-0876-00]])  
More often than not, the T633 Transformer (part number [[120-0876-00]])  
is the problem on almost all of them.
is the thing to fail.<br>




[[Category:Instrument repair reports]]
[[Category:Instrument repair reports]]

Revision as of 11:32, 28 December 2021

(Common Problems)

The 221 has a switching power supply. It has a transformer coupled trigger circuit which produces a DC level base trigger. It gets fried when the battery gets old and draws too much current.

More often than not, the T633 Transformer (part number 120-0876-00) is the thing to fail.