Oki 4M - Manual (Page 54)

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3.3.11 Pressure Roller B (Back Up Roller)
(1) Dismount the upper cover assy. (See Section 3.3.4.)
(2) Dismount the high-voltage power supply board. (See Section 3.3.5.)
(3) Dismount the heat assy. (See Section 3.3.9.)
(4) Dismount the engagement with the left ground, then pressure roller B 1 . (Two bearing BUs
2 and two bias springs 3 also come off at the same time.)
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