Epson LQ 1050 - B/W Dot-matrix Printer - DC Supply Circuit

REV.-A
2.3.2.8 +12 VDC Supply Circuit
The 12 VAC from the transformer is half-wave recrified by diode D7 and is converted to +12
VDC.
As shown by Figure 2-25, the half-wave rectified voltages pass through the capacitor smoothing circuit
so that the ripple is small, and the average DC voltage rises when no load current flows and drops as
load current increases.
v
[“z z::
D7
3
&
.-
+ 12V
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1’
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t
II I
+ C4
CN1 O
1000
R12
25V
3. 3K
4
Figure 2-25. +12 VDC Circuit
2-25
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