HP 2500C Series - Manual (Page 168)

Removal and Replacement of Parts (without Calibration) 7-18
Step 9. Remove the ink supply station cover by
unscrewing the screw near LCD and LED
connectors. Then lift up the cover. Set
the cover aside.
Note
There is an additional screw hole available for
the ISS cover.
Step 10. Locate the power knob and unlatch both
sides of the knob. Be careful not to break
the latches !