Switch Circuit Board Assembly; Sub Circuit Board Assembly; Interface Circuit Board Unit - Epson TM-L90 series Service Manual

Confidential
DIP switch on the main circuit board (DSW2)
This DIP switch is used only at the factory. Always set this to OFF.

Switch Circuit Board Assembly

The switch circuit board assembly consists of three LEDs, one switch, and one DIP switch.

Sub Circuit Board Assembly

The next table shows the major components of the sub circuit board and their major functions:
Table F-4 Major components of the sub circuit board unit and their major functions
Block Location
Connector CNS1
CNS2
CNS3

Interface Circuit Board Unit

The interface circuit board unit serves as the core of the system that controls data send and
receive operations between the TM-L90 and host computer. Various interface circuit boards can
be used (including the EPSON UB series, except for the UB-P02 and UB-S03).
Rev.B
Signal name Description
PS —
DKD —
— —
TM-L90 Service Manual
Function
Connector for PS adapter connection
Connector for drawer connection
Cable for main circuit board connection
Overview of Electric Circuits Appendix F-5