Epson LQ 1050 Technical Manual - Page 70
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REV.-A 2.3.2.9 Vx Voltage Supply Circuit -. { When the +24V power supply line reaches 18.6 V (18 V + 0.6 V), transistors Q30 and Q23 turn on and Vx (+5 V) is output. On the other hand, if the + 24V power supply line drops to 18.6 V or less, Q30 and Q23 turn off and the Vx voltage is shut off. q Reset Circuit Power Supply When the power is switched on or off, the circuit is reset so that it will not drive the printer until the power supply becomes stable. +24V + 5V A () R71 10K ZD 10 RDZOJSB2 Q23 A1015 I) R38 I-5 6. 2K I R69 3. 9K 030 C1815Y + d7 Figure 2-26. Vx Voltage Circuit 2-26 ,,
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REV.-A
2.3.2.9
Vx Voltage Supply Circuit
-.
{
When the
+24V
power supply line reaches 18.6 V (18 V + 0.6 V), transistors
Q30
and
Q23
turn on
and Vx
(+5
V) is output. On the other hand, if the +
24V
power
supply
line drops to 18.6 V or less,
Q30
and
Q23
turn off and the Vx voltage is shut off.
Reset Circuit Power Supply
When the power is switched on or off, the circuit is reset so that it will not drive the printer until
the power supply becomes stable.
+24V
ZD 10
I
RDZOJSB2
R38
6.
2K
+ 5V
A
Q23
A1015
(
)
R71
10K
I
)
I-5
030
C1815Y
R69
3. 9K
+
d7
Figure 2-26. Vx Voltage Circuit
2-26
,,