42114101 Rev.1
25 /
2.1.7 Operation Panel
The clock synchronization OPCLK of LSI is used to input the switch data and output the LED
data through the operation panel control IC.
LSI
Operation panel control IC
OPTXD
OPCLK
OPCLR-N
OPRXD
48
47
45
OPTD
OPCK
NPA2
OPRD
Command
and Data
latch
LED driver
Switch
controller
+5V
46
A 2-byte (15 bits + 1 even parity bit) command (OPTXD) is transmitted to the Operation panel
contol IC in synchronization with the OPCLK signal. The Operation panel control IC decodes
this command and when it is found to be legal, returns a 2-byte command response back to
the LSI which includes data on Switch information, LED status, receive command ACK/NAK and
1 odd parity bit.
Any transmission errors found cause the command to be reissued after the transmission of the
OPCLR-N signal.
Summary of Contents for ML490 Series
Page 1: ...42114101 Rev 1 1 135 ML490 491 PRINTER Maintenance Manual ODA...
Page 2: ...42114101 Rev 1 2...
Page 38: ...42114101 Rev 1 38 Drive gear Ink tank Ribbon cartridge Figure 2 6...
Page 48: ...42114101 Rev 1 48 Change arm Change lever Platen Release cam Figure 2 13 REAR TOP BOTTOM...
Page 96: ...42114101 Rev 1 96 9 Carriage Assy NK2 10 SUS Bearing portion of guide roller EM 30L B...
Page 119: ...42114101 Rev 1 119 6 8 9 7 1 2 3 11 10 4 5 Figure B 2 Printer General Assy...
Page 124: ...42114101 Rev 1 124 9 12 11 1 13 3 7 1 14 5 6 7 2 10 8 Figure B 4 Carriage Assy...
