SUB-A BOARD ASSY - 2122765

2122765 – Sub-A board (Sub-A Board Assy) – Epson Stylus Pro GS6000

The sub board (Sub-A Board Assy, 2122765) is fitted to Epson printers. It ensures the electronic control of a machine sub-system and passes the signals to the main board.

The service manual describes it as a relay board between the main board and the right-hand side parts: right cover sensors, sub-tank sensors, pump motors, lever sensor, rear paper sensor and carriage home position sensor. Its removal requires unlocking the carriage, hence its nickname “CR board”.

Technical specifications

• OEM reference: 2122765
• Manufacturer: Epson
• Part type: Sub board
• Manufacturer designation: SUB-A BOARD ASSY. (dealer nickname: CR board)
• Main board link: 3 FFC cables J1 / J2 / J3 to CN20 / CN21 / CN22 of the MAIN BOARD
• Other connectors: J4 to J19: sensors, pump motors, CR HP sensor
• Fixing: 5 M3×6 screws
• Location: Right-hand side, carriage and maintenance station area
• Shipping: Shipped ready to install

Compatibility & use

• Epson STYLUS PRO GS6000
• Never insert the FFC cables at an angle; label the cables before disconnecting them

Function

• Relays the right-hand side cover, sub-tank, lever and rear paper sensors to the main board
• Powers and controls the pump motors
• Passes the carriage home position sensor signal (CR 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

• Right-hand side sensors not read: covers reported open, sub-tanks not detected
• Errors 1133 to 1137 (CR HP sensor) or 1920 to 1927 (sub-tank sensors) that may trace back to this relay board
• 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

• 2122761 — SUB-B board (left-hand side relay)
• 2122762 — SUB-C board (cartridge / CSIC relay)
• 2122766 — SUB-D board
• 2124353 — GS6000 main board (MAIN BOARD ASSY)

♻️ DG Spare Parts – European specialist in spare parts for large-format printers and plotters.