Switch Circuit - Epson TM-U675 Service Manual

Confidential

Switch Circuit

The 24V supplied from the external power source is supplied to the required locations in this
circuit. The supply power source and application are described below. The 5V system is
controlled by the same switch.
Table D-14 Switch circuit
Type (circuit
network name)
24VB
24VC
24V(DM)
VCC
VCC-PWR
VCC_SEN
CN29
1 SIN2-1
1
2
2
F1
CN18
1
1
2 D16
2
3 D1F20
3
4
SH
MIN1
Appendix D-68 Product Overview
Switch
(On/Off)
OUTH
24VSW1
None
None
24VSW1
SEN_PWR
VCC
R207
R208
L3
1 2
3 4
C40
C41
Figure D-65 Switch Circuit
Control Use
GA (U30) Circuit power for impact head drive, autocutter drive,
MICR reading. ON at power up and cannot be turned
OFF.
GA (U30) Mechanical power for slip system and journal system.
None DM power, DK power
None Starts after power switch is turned ON.
GA (U30) 5 V used for slip system and journal system.
CPU (U3) Power for paper detection sensor for slip system.
Q44
VCC-PWR
1 8
S1 D1
2 7 VCC_SEN
G1 D1A
3 6
S2 D2A
4 5
G2 D2
3
2 24VSW1
1
Q51
24VB
C42
3 2
R244 Q61
C605
R245
Q45 F2
3 2 1 2
R176 Q46
R177
1 2 3
1
Q59
SEN_PWR
1
D1
2
D2
3
G
2
R243
3
1
Q17
3
C43
R96
R94
C44 Q24
3
1
24VC
D45
24VSW1
2 2 1
VCC-PWR2
6
D4
5
D3
4
S
1
Q60
2
24VA
2
D22
2 2 1 24VSW2
Rev.D