Epson TM-L90 series User Manual

Rev.B Overview of Electric Circuits Appendix F-1
TM-L90 Service Manual
Confidential
Appendix F
Overview of Electric Circuits
General Description
The figure below shows a block diagram of the electric circuits for the TM-L90.
Switch board
(with DIP switch)
I/F circuit board
Power
switch
Powercontrol
circuit
Volatile RAM
(U8)
DRAM
Font ROM
(U9)
Flash EEPROM
Program ROM
(U7)
Flash EEPROM
CPU
(U4)
BUS
VI0
VBUS
Paper feed motor drive
circuit
Auto cutter motor
drive circuit
Sensor circuits
Thermal head drive circuit
Thermal head
Printer mechanism
VI0
+5V power system
+3.3V power system
+24V power system
DKD driver
I/F circuit board
interface
Switch board
interface
Host
interface
Drawer
Power supply
CN7
CN6
CN4
CNS3CNS1
CNS2
CN11,12,13
CN10
CN8
CN9
Main circuit board unit
TM-L90
+24V
Sub board

Epson TM-L90 series Specifications

General

Brand	Epson
Model	TM-L90 series
Category	Printer
Language	English