Logic Components - Brother TD-4000 Service Manual

2.3.1

Logic Components

(1) CPU
CPU (U12) controls and manages the entire system, which is 32bits microcomputer
of NEC brand.
(2) Flash ROM
One 64M-bits flash ROM is used, where the program, font and downloaded data
are stored.
(3) SDRAM
TD-4000:
TD-4100N: 128M-bits
It is used when the program is executed, and when the received data is stored
temporarily.
(4) EEPROM
One 4Kbits EEPROM (U3) is used. This memory is used for write and storage of
baud rate information, Vendor ID code, Product ID code and mechanical
information.
If the main PCB is replaced, it is needed to write the serial number printed on the
EEPROM mounted on the main PCB and the mechanical configuration date.
For this operation, refer to
64M-bits
"APPENDIX 1 SERVICEMAN SOFTWARE
II - 11
TOOL".