Mita-Kyocera FS-6900 Service Bulletin

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The printer uses a bi-directional parallel interface for high-speed data transmission for the host
computer. This interface includes the buffers which are compatible with the IEEE 1284 stan­dards. The parallel interface provides support for the ECP and nibble modes in this standard.

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The pins of the parallel interface connector carry the signals listed below.

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1 nStrobe (STBIN1/2
2 Data1 (PAD0) 20 Ground GND
3 Data2 (PAD1) 21 Ground GND
4 Data3 (PAD2) 22 Ground GND
5 Data4 (PAD3) 23 Ground GND
6 Data5 (PAD4) 24 Ground GND
7 Data6 (PAD5) 25 Ground GND
8 Data7 (PAD6) 26 Ground GND
9 Data8 (PAD7) 27 Ground GND
10 nAck (ACKOUT) 28 Ground GND
11 Busy (BUSYOUT) 29 Ground GND
12 PError (PERROR) 30 Ground GND
13 Select (SELECT) 31 nInit (INIT
14 nAutoFd (AUTOFD
15 Not defined NC 33 Not defined Pull-up (1kΩ)
16 Logic ground GND 34 Not defined NC

†

Chssis ground (GND) 35 Not defined Pull-up (1kΩ)

17

††

Peri-logic H (VCC) 36 nSelect In (SELECTI)

18

†. Grounded through a chip bead or resistor.
††. Rat ed current is 0.5 A (fused).

) 19 Ground GND

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)32nFault (FAULT)

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Detailed descriptions of the parallel interface signals follow.

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Strobe* [nStrobe] 1 A negative-going Strobe* pulse causes the printer to read and latch

Data 0 [1] to Data 7 [8] 2-9 These eight signals form the data byte sent from the host compu ter

Acknowledge* [nAck] 10 This negative-going pulse acknowledges the previous character

the data on the Data 0 [1] to Data 7 [8] signal lines.

to the printer. Data 7 [8] is the most significant bit.

received by the printer. Acknowledge* pulses are sent only when
Busy is low.

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Busy [Busy] 11 This signal is high when the printer is busy and low when it is able

Paper Empty [PError] 12 This signal goes high when the printer runs out of paper.
On-Line [Select] 13 This signal is high when the printer is on-line and low when the

Auto-Feed [nAutoFd] 14 This signal is used in the Epson version of the Centronics interface

+5 V DC 18 This line is connected to the printer’s +5 V DC line (+5 V*0.5 V,

Prime [nInit] 31 This signal is used in the standard Centronics interface to enable

Error* [nFault] 32 When the high-speed parallel line control is on (FRPO O2=2), this

Auxiliary output 1 33 This signal line is not used.
Power Ready 35 This signal is high when the printer’s power is on.
Select In [NSelectIn] 36 This signal is used in some versions of the Centronics interface to

to accept more data. Every high-to-low transition is followed by an
Acknowledge* pulse.

printer is off-line. It goes low when the upper unit is raised, or
when the ON LINE key is pressed to set the printer off-line.Note ­The Paper Empty and On-Line signals are not used unless enabled
by the FRPO command ( O 2 parameter).

to receive a carriage return. In high-speed mode, it is used as an
interrupt.

250 mA maximum, fused).

the computer to reset the printer. It is ignored by the printer.

line returns error status.

enable the computer to force the printer on-line. In high-speed
mode, it is used as an interrupt.

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