Pcba-Ret (B 590, B 570 Qe, B 540, B 520 & B 500 Embroidery Only) - Bernina B 590 Service And Maintenance Manual

4.2.8 PCBA-RET (B 590, B 570 QE, B 540, B 520 & B 500 Embroidery Only)
See ESD-related note
Disassembly:
• Remove the covers (see 4.1)
• Picture 1 - Remove SSU slide and knobs.
• Picture 2 - Disconnect PCBA-RET flat ribbon
cable.
• Picture 2 - Remove three screws c T10 (3x8).
• Lift PCBA-RET off.
• Picture 3 - Upper-thread sensor light barrier 1.
• Picture 3 - PCBA-Front cover flat ribbon cable
connector 2.
Assembly:
• Position PCBA-RET properly, taking care not to
jam the flat ribbon cable.
• Picture 2 - Refit PCBA-RET with three screws c.
• Picture 2 - Reconnect PCBA-RET flat ribbon
cable.
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