F 12 Vdc Half-Wave Rectifier-Smoothing Circuit - Epson LQ-1050 Technical Manual

REV.-A
2.2.6 +12 VDC Half-Wave Rectifier-Smoothing Circuit
The power from this circuit is mainly supplied to the RS-232C Interface on the optional interface board.
Both the + 12 V and – 12 V lines have their own half-wave rectifier circuits. The smoothing circuits
consist of capacitors C23 and C24, and include dummy resistors R27 and R28 which control the rise
of voltage when the * 12 V lines have no load, as well as current limiting resistors R25 and R28. (Refer
to Figure 2-20.)
Fig. 2-20. Half-Wave Rectifier-Smoothing Circuit
2-20