Sub Board 6100A - 2093626

2093626 – Sub board (Sub Board 6100A) – Epson Stylus Pro

The sub board (Sub Board 6100A, 2093626) is fitted to Epson printers. It ensures the electronic control of a machine sub-system and passes the signals to the main board.

Epson distributors reference it "BOARD ASSY.,SUB 6100A,STANDARD" for the Stylus Pro 7800, 9800, 7880, 9880, 7450 and 9450. In the Epson Stylus Pro 7400/7800/9400/9800 service manual, it is the "C594 SUB Board", known as "Relay Board 1", fitted on the carriage: it receives three 31-pin flat cables from the main board and distributes the signals to the print head, the cutter solenoid and the sensors mounted on the carriage (ink mark, CR encoder, paper edge, CR and PG home positions).

Technical specifications

• OEM reference: 2093626
• Manufacturer: Epson
• Part type: Sub board (PCB)
• Manufacturer designation: "BOARD ASSY.,SUB 6100A,STANDARD"; schematic name "C594 SUB Board" ("Relay Board 1" in the service manual)
• Connectors: CN1, CN2, CN4: 31-pin FFC flat cables from the main board (CN17/CN18/CN20); CN5, CN6: 31-pin FFC flat cables to the print head; CN7: 2 pin (cutter solenoid); CN8: 4 pin ("Ink Mark" sensor); CN9: 5 pin (CR encoder sensor); CN10: 4 pin ("P Edge" sensor); CN12: 2 pin ("PG HP" sensor); CN13: 2 pin ("CR HP" sensor)
• Location: On the carriage, behind the "CR Cover Assy" (removal: H Top Cover, unlocking and centring the carriage, CR Cover Assy screws); fixed by 3 M3×8 pan head screws and 1 M3×14 screw which also secures the earth lug
• Adjustment after replacement: Service manual, required adjustments table: "Colorimetric Calibration" (Color ID) after replacing a Relay Board
• Note: The Epson service manual designates this board "BOARD ASSY., SUB" / "C594 SUB Board" without giving the 2093626 code; the association with "SUB 6100A, STANDARD" comes from distributors. Common nickname among sellers: "Sub CR Board". The Stylus Pro 7500 and 9500 listed above belong to an earlier generation (non-C594 boards) and are not cited by any source for 2093626: 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
• When refitting, follow the numbers printed on the FFC flat cables and on the board (CN1/CN2/CN4 on the main board side, CN5/CN6 on the head side) and do not pinch the harnesses under the CR Cover.
• The service manual first targets the connected sensors and cables (CR encoder, CR HP, PG HP) for the error codes below: only suspect the SUB board after checking these elements.

Function

• Relay between the main board (3× 31-pin flat cables) and the print head (2× 31-pin flat cables) — electronic hub of the carriage
• Connects the cutter solenoid and the carriage sensors: ink mark ("Ink Mark"), carriage encoder ("CR Encoder"), paper edge ("P Edge"), home positions "CR HP" and "PG HP"
• Ensures the electronic control of a sub-system
• Passes the signals to the main board
• Acts as an interface between the firmware and the hardware

Signs of wear

• "SERVICE CALL 00010004" (CR Encoder check error): carriage encoder signal missing or inconsistent — the CR encoder is routed through CN9 of this board
• "SERVICE CALL 00010005" (CR Motor is out of step) and "00010007" (CR Motor out of position time-out): abnormal CR encoder pulses; the 00010005 also cites a disconnected cutter solenoid (CN7)
• "SERVICE CALL 0001001D" (CR servo parameter error): dirty encoder or encoding strip, poorly connected harness
• "SERVICE CALL 0001000A" (Carriage home position detection error, CR HP sensor on CN13) and "0001000C" (PG home position detection error, PG HP sensor on CN12)
• Sub-system not driven
• Electronic errors
• Loss of internal communication
• Erratic behaviour or machine stops

Replacing this part restores the machine to proper working order.

Related parts

• 2093628 — "BOARD ASSY., SUB; B" (C594 SUB-B, Relay Board 2, right ink compartment)
• 2093630 — "BOARD ASSY., SUB; C" (C594 SUB-C, Relay Board 3, left ink compartment)
• BOARD ASSY.,ENCODER,CR;B — carriage encoder sensor connected on CN9
• BOARD ASSY.,INK MARK / BOARD ASSY.,PW — carriage sensors connected on CN8 ("Ink Mark") and CN10 ("P Edge")

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