Brother TD-4000 Service Manual page 17

<For 220/230/240V model>
Oscillator circuit
7.6MHZ
Photo sensor for
detecting top edge
of media
Cutter home position
sensor
FEED, CUT button
Green LED, Red LED
Cover open sensor
POWER button
Key PCB
Cover left sensor
Fan motor unit
Lock
signal
+8V output
AC power supply
220/230/240V
Figure 2.3-2 Block Diagram of Main PCB (For 220/230/240V model)
16bits bus
CPU
850E/MA3
(NEC)
ROM: 256KB
RAM: 16KB
INT
+25V
output
Switching Power supply
power supply shunt PCB
II - 10
EEPROM
(4Kbits)
FROM 64Mbits
(Max. 64Mbits)
TD-4100N: TD-4000:
SDRAM 128Mbits SDRAM 64Mbits
(Max. 128Mbits) (Max. 64Mbits)
USB IC D12 USB IF
TD-4100N only
LAN IC LAN 9115 LAN IF
RS232C RS232C
IC IF
DC motor
Normal/reverse
drive circuit
Step motor
Bipolar constant current
drive circuit
Thermal head
temperature detect circuit
+25V power supply
voltage detect circuit
+25V output
(for drive power supply)
ON/OFF
current control signal
+2.5V power
supply circuit
+3.3V power
supply circuit
+5V output
Switch
DC motor
for full cut
For tape feed
driving
Thermal head
+2.5V output
(for CPU power supply)
+3.3V output
(for logic power supply)