DRUM UNIT hp Color 9850mfp II UNIT EXPLANATION 2-24 Symbol Name Function or method PS66 Encoder sensor K1 Detects the rotation of the encoder for the drum K Manages the drive of the drum motor K (M17) There are two sensors, PS 66 and PS67, at opposite of the encoder to cancel the rotational fluctuations due to the eccen- tricity of the encoder PS67 Encoder sensor K2 Detects the rotation of the encoder for the drum K Manages the drive of the drum motor K (M17) There are two sensors, PS 66 and PS67, at opposite of the encoder to cancel the rotational fluctuations due to the eccen- tricity of the encoder