Genicom MatrixPrinter LA36 - Manual (Page 129)

5-42
(3) Main voltage regulation switching (Figure 5.41 C)
Smoothed DC voltage is converted to high-frequency on/off voltage by changing the frequency and duty of the
on/off voltage pulse (Table 5.2).
Table 5.2 Voltage regulation switching control
Frequency
20 kHz to
250 kHz
Regulation control
Frequency change
(duty also changed)
Switching control
Self-activated
flyback converter
Voltage
+5 V
+34 V
(4) Protection
a. Primary circuit protection
A fuse is equipped between the power inlet and the power switch. The fuse holder is near the power switch on
the power supply board. The fuse has the following fuse rating:
100 to 120 VAC input: 6.0 A, 125 VAC
220 to 240 VAC input: 3.15 A, 250 VAC
If the rectifier and smoothing circuits (Figure 5.41 B) or the main switching circuit (Figure 5.41 C) malfunctions
causing a short circuit, the fuse is blown to prevent a secondary failure.