Printronix P9012 Maintenance Manual page 39

BUFFERED ADDRESS BUS
BUFFERED DATA BUS
MCU REC
D0–7
DOT
COUNTER
HAM
COM
HSC
Figure 2–15. Mechanism Control Unit (MCU) Block Diagram (2 of 2)
Principles of Operation
SRAM
16K X 8
STATUS
REGISTER
D0–3 D4–7
BD0–3
PAPER FEED
BD0–3
FIRE
CONTROL
FIRE 0,1,2
LOGIC
AIRFLT
IL
NFLT
NPLAO
NPADO
NRIBFLT
PMD
RIBBON
CONTROL
PF1/2
(4)
PF3/4
NHCK
NUD/HRS
DCMOD
FAULT
I/F
MECH
DRIVER
I/F
(3)
MECH
DRIVER
I/F
DCU I/F
HAMMER
DRIVER
I/F
MECH
DRIVER
I/F
2–21