HP V8.5 - Manual (Page 46)

THEORY OF OPERATION
5
5
-
2
V8.5e
Rev
2.2.2002
8-bit Parallel Data
Data Input
Interface
Data
Buffer
Non-
volitile
RAM
24 V C
Power
Supply
Motor
5 V DC
Power
Supply
Micro controller
Character generator
ROM (print mode)
Sensor Pod
Parallel
to serial
Thermal
Printhead
Input
Decoder
REM
REM
REM
REM
REM
MODE
Temperature Feedback
Figure 5-1. Functional block diagram