Main Board Operating Principle - Epson TM-U950 Technical Manual

CONFIDENTIAL

Main Board Operating Principle

Power supply circuit for the TM-U950
The 24 V DC at CN6 (when IM-403/405 is not connected) or at CN9 (when IM-403/405 is
connected) is filtered and supplied to the +24 V line and the +5 V regulator circuit. The +5 V
regulator circuit uses the switching method to convert the +24 V input into a +5 V output. The
switching regulator IC (U9) switches the +24 V DC. The voltage is smoothed by L18, D13, and
C49, and is supplied as the +5 V output.
Figure 2-45. Power Supply Circuit for the TM-U950
Power supply circuit for the TM-U950P
The 24 V DC at CN6 is filtered and supplied to the +24 V line and the +5 V regulator circuit. The
+5 V regulator circuit uses the switching method to convert the +24 V input into a +5 V output.
The switching regulator IC (U9) switches the +24 V DC. The voltage is smoothed by L18, D13,
and C49, and is supplied as the +5 V output.
( TO
POWER SW )
CN1
+24V
IN
+24V
GND
+24V
NC
FG
CN6
2-30 Mechanism Configuration and Operating Principles
1
1
2
2
D14
1
F1
L12
C28
2
1
1
2
2
3
3
R10
4
SH
C10
FG
Figure 2-45a. Power Supply Circuit for the TM-U950P
+24V
U9
1 2
VIN SW
R224 G
3
N
F/B
C27
D
4
+
D13
C51
_
GP
+5V
L18
+
C49
_
SG
Rev. A