Brother HL-2600CN Service Manual page 233

4.2.2 IOD2 PWB 2 (with Base)
1) Disconnect all the harness connectors (16 pcs.) connected to the IOD2 PWB 2.
2) Remove the IOD harness guide.
3) Remove the set screws ST3X6 (2 pcs.) to remove the IOD2 PWB 2 (with base) from
the printer.
4) Remove the set screws ST3X6 (4 pcs.) to remove the IOD2 PWB 2 from the (base).
When handling the IOD2 PWB 2 take care not to cause electrostatic damage to the PWB.
PRECAUTION 
Fig.7-30
Base
Fig.7-31
VII-21
IOD harness guide
IOD2 PWB 2 (with base)
IOD2 PWB 2