Toner Sensor Pu (Ttr) - Brother MFC-9420CN Service Manual

5.1.54 Toner Sensor PU (TTR)

(1) Remove the setscrew (BT3x8 and BT3x6, 1 each) of the toner sensor PU (TTR).
(2) Disconnect the connector connecting to the toner sensor PU (TTR).
(3) Remove the toner sensor PU (TTR) from the frame.
<Confirmation Items>
• Is the grounding wire securely installed to the indicated position?
• Isn't any harness caught?
• Is the appropriate screw used?
• Is each output terminal of the HV power supply PU installed properly?
• After above confirmation, confirm the safety through the withstand voltage test or with
the insulation tester.
CAUTION:
Replacement of the toner sensor PU (TPD/TTR) requires the substantial disassembly and
also reassem-bly. As the inappropriate assembly procedures and the wrong use of screws
affect the product safety and the product performance, the appropriate assembly proce-dures
and the caution items must be respected. (This work requires the insulation withstand
voltage test and the measurement of the insulation resistance.)
BT3x6
Toner sensor PU (TTR)
BT3x8
Frame
Fig. 5-101
5-65
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