Sub C Board C594 - 2093630

Secondary board (Sub-C Board C594) — 2093630

The secondary board (Sub-C Board C594, 2093630) fits Epson printers. It provides the electronic control of a sub-system of the machine and passes signals to the main board.

In the Epson Stylus Pro 7400/7800/9400/9800 service manual, the "C594 SUB-C Board" is "Relay Board 3" of the left ink compartment: connected to the main board via a 26-pin ribbon cable (Main CN23), it relays the left cartridge lever sensor, the four CSIC relays of the left cartridges, the paper feed encoder (PF Encoder), the ink circuit pressure sensor, the front sensor and the maintenance tank.

Technical specifications

• OEM reference: 2093630
• Manufacturer: Epson
• Part type: Secondary board (sub board)
• Manufacturer designation: "BOARD ASSY., SUB; C"; drawing name "C594 SUB-C Board" ("Relay Board 3" in the service manual)
• Connectors: CN1: 26-pin FFC ribbon to the main board (CN23); CN5: 2 pins ("I/C Lever Sensor L"); CN6, CN7, CN8, CN9: 7 pins (CSIC relays L1 to L4); CN10: 4 pins ("PF Encoder Sensor"); CN15: 3 pins ("Pressure Sensor"); CN16: 2 pins ("Front Sensor"); CN17: 7 pins (maintenance tank)
• Location: Left side of the printer, behind the "L Side Cover Assy"; secured by 4 M3x6 pan-head screws
• Adjustment after replacement: Service manual, required adjustment table: "Colorimetric Calibration" (Color ID) after replacing a Relay Board
• Note: The service manual does not give the part code: the association between 2093630 and "C594 SUB-C" is based on the part name and vendor data. The manual covers the 7400/9400 and 7800/9800, noting connector differences between the two variants. The Stylus Pro 7500 and 9500 listed above belong to an earlier generation (non-C594 boards): no source cites them for 2093630, check before ordering.
• Shipping: Shipped ready to install

Compatibility & use

• Epson STYLUS PRO 74xx
• Epson STYLUS PRO 75xx
• Epson STYLUS PRO 78xx
• Epson STYLUS PRO 94xx
• Epson STYLUS PRO 95xx
• Epson STYLUS PRO 98xx
• This board carries the paper feed encoder: a poorly seated ribbon cable on CN10 directly produces "0001000x" PF motor errors. Check this connector before blaming the encoder or the motor.
• The service manual gives two connector assignment tables (7400/9400 variant and 7800/9800 variant): go by the markings silkscreened on the board before reconnecting.

Function

• Relays the left ink compartment to the main board (26-pin ribbon cable to Main CN23)
• Connects the left lever sensor, the 4 CSIC relays of cartridges L1 to L4, the "PF Encoder" paper feed encoder, the ink pressure sensor, the front sensor and the maintenance tank
• Provides the electronic control of a sub-system
• Passes signals to the main board
• Acts as an interface between the firmware and the hardware

Signs of wear

• "SERVICE CALL 00010000" (PF Encoder check error): no PF encoder pulses at initialisation or during rotation — connector or encoder harness, A/B phases reversed; the PF encoder runs through CN10 on this board
• "SERVICE CALL 00010001" (PF Motor out-of-step), "00010003" (PF Motor out of position time-out), "0001001E" (PF servo parameter error): abnormal PF encoder pulses
• "SERVICE CALL 00010014" (Failure of pressurizing): pressure sensor disconnected or faulty ("Pressure Sensor" on CN15)
• "SERVICE CALL 00010020" (CSIC reading/writing error): explicit manual remedy, replace the Sub Board B/C
• Sub-system not driven
• Electronic errors
• Internal communication loss
• Erratic behaviour or machine stoppages

Replacing this part restores the machine to proper working order.

Related parts

• 2093628 — "BOARD ASSY., SUB; B" (C594 SUB-B, Relay Board 2, symmetrical board on the right side)
• 2093626 — "BOARD ASSY., SUB" (C594 SUB Board, Relay Board 1, on the carriage)
• PF Encoder Sensor / loop scale — paper feed encoder sensor connected on CN10; remedy for errors 00010000, 00010001, 00010003 and 0001001E
• Holder Assy IC Left — CSIC relays L1 to L4 of the left cartridges, connected on CN6 to CN9

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