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E. Video Interface Control
1. Outline
To connect the printer to an external device, such as a host computer, a video controller PCB
(interface PCB) is needed.
This section explains the kinds of interface signals exchanged between the printer and the
video controller PCB, and gives information concerning the sequence of printer operation mak-
ing use of interface signals.
a. Video interface signals
External device
(host computer, etc.)
Video controller
PCB
/BD
/PPRDY
/RDY
/VSREQ
/SBSY
/STS
/CCRT
/PCLK
/PDLV
/PFED
/SPCHG
/CBSY
/PRNT
/VSYNC
/PRFD
/CPRDY
VDO
/VDO
/CMD
/CCLK
CPSEL
/FPCS
/FPO
/FPI
FPCK
Figure 2-2-12
DC controller
PCB
LASER DRIVE
signal
(VDO, /VDO)
CHAPTER 2
Printer
Laser
driver
2 - 21
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