2/ Construction; Summary-Block Diagram And Flowchart - Radio Shack TRS-80 Service Manual

2/ Construction
Summary -BIock Diagram and Flowchart
Figure 1 shows the block diagram and Figure 2 is a flowchart showing the sequence of its motion.
Parallel interface connector
Simplified BIock Diagram
Serial interface connector
Data strobe
Input
Acknowledge
data Busy
Status
RS-232-C
Receiver
driver
Sensor receiver
H solenoid
Dot sensor
Clock
generator
100VAC,
|2!f JN AIL ir
2:2f JN Nf or
Pa ra I I e I
240VTran
serial
Se
ect
switch
1IIIIIIIIIITI
for.in
Buffer
Power -
I
I
_______I
Home sensor
Rotaticm
detector
Feed drum
Figure 1
Print head
-4-
Electronics
Print mechanism