Toshiba e-STUDIO 2555C Service Manual page 107

9. High-voltage transformer (HVT)
A circuit generates the output control voltage Vc of the main charger bias, main charger grid bias,
1st transfer roller bias, 2nd transfer roller bias and developer bias.
10.Drum/TBU motor (M6)
This motor drives each drum and toner recovery auger. The drive of the motor is transmitted to each
drum by gears in the following 2 lines: Drum/TBU motor → K drum → C drum → Y drum
The gears and drum couplings are assembled with high precision in order to improve accuracy of
color overlay.
11. Mono/color switching motor (M3)
This motor switches ON/OFF the transmission of drive to the Y, M, C drums. When the motor rotates
normally or reversely, the gear of the motor moves the rack to shift the guides. And this movement of
the guides controls the transmission of the drive by engaging and disengaging gears which transmit
the drive to the Y, M, C drums. Additionally, the drum switching sensor detects the phase of the
guide to control the mono/color switching motor, and checks whether the drive is transmitted to the
Y, M, C drums or not.
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OUTLINE OF THE MACHINE
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