Epson 890N Service Manual - Page 74

EPSON FX-890/2190 4.2.3 C524MAIN Board C A U T IO N „ The C524MAIN board has the mechanical drive power supply voltage (+42V, Vp) management circuit and an electrical characteristic of the components composed of this circuit is measured with the custom instruments and regulated at the assembly process. Never attempt to replace any components of this circuit on the board, and doing so resulted in damaging the unit. „ Be careful with the edges of the shield plate, as they are very sharp. „ Be sure to match the connector colors with each other. 1. Perform Pre-Disassembly. (p.70) 2. Remove the Upper Housing. (p.72) 3. Remove 5 CBS (M3x6) screws and 2 CBP (M3x12) screws securing the shield cover to the Printer Mechanism and lower housing. Then remove the shield cover. (See Figure 4-8) 4. Disconnect all the connectors connected to the C524MAIN board. (See Figure 4-9) CN No. Pins CN5 2 CN6 2 CN7 3 CN8 2 CN11 2 CN12 5 CN13 4 CN14 10 CN15 CN16 CN19 2 CN20 Table 4-4. Color Connected to Blue PG Detector Black Front PE Detector White Rear PE Detector White HP Detector Yellow Release Detector Red CR Motor White PF Motor - C524PSB/PSE/PSH Board (FPC) Printhead (FPC) Printhead White Fan (FPC) Panel CBP Screws (3x12) x2 Tightening Torque : 0.78-0.98 N.m No screw here (Screw for tightening the Upper Housing together must be installed later) Revision B CBS Screws (3x6) x5 Tightening Torque: 0.58-0.78 N.m Shield Cover Figure 4-8. C524MAIN Board Removal 1 Disassembly and Assembly Figure 4-9. C524MAIN Board Removal 2 Main Components Disassembly 74