Canon NP6251 Service Manual page 151

Turning off the roller electrode
• High-voltage DC remote signal (DCBTP) is '0' and roller bias signal (ROED) is
'0'
Switch circuit goes OFF.
High-voltage transformer drive circuit goes OFF.
DC transformer T402 goes OFF.
The above condition deprives the roller electrode of bias.
Signal*
HVT output
DC bias ON
DC bias OFF
Roller bias ON
Roller bias OFF
* Output from the DC controller PCB (connector No.).
Table 4-202 Combination of Developing DC/Roller Electrode Bias Output Signals
COPYRIGHT © 1997 CANON INC.
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Switching signal
DCBTP ACBTP
J114A-10 J114A-3
'1' '1'
'0' '0'
'1' '0'
'0' '0'
CANON NP6350/NP6251 REV. 0 JULY 1997 PRINTED IN JAPAN (IMPRIME AU JAPON)
CHAPTER 4 IMAGE FORMATION SYSTEM
ROED ACON
J114A-1 J114A-7
'1' '0'
'0' '0'
'1' '0'
'0' '0'
Control signal
DCBC
J114A-2
3~11V
2V
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