Electrical Adjustment; Leds And Vr Settings; Setting Vrs - Canon LBP-CX Series Service Manual

D. Electrical Adjustment
1. LEDs and VR settings
a. LEDs
LEDs on the main PCBs allow visual checking of electrical signals. The following table indicates these LEDs
and their reasons for lighting.
PCB
LED Reason for lighting
DC controller LED201 Lights continuously when the laser beam is turned ON at more than
the specified intensity
Scanner driver
LED401 Lights continuously when the scanner motor is rotating at the specified
speed (SCNRDY is TRUE.)
DC power supply & LEDSOl Lights continuously when the main motor is rotating at the specified
main motor driver speed
Table 7-4 LEDs
b. Setting VRs
VR202 is the only VR in the DC controller that can be adjusted in the field. Adjust VR202 (only if neces-
sary) for proper laser power when a DC controller PCB or a laser unit is replace.
Note:
Removing the connectors with the power ON will overload the laser and damage it, so be certain to SWITCH THE
POWER OFF BEFORE REMOVING CONNECTORS. Improper adjustment will also damage the laser. Read
the section on laser power adjustment (see II. D. 3 in this Chapter) very carefully before beginning.
2. Checking the DC controller and AC driver (AC controller and the fixing roller heater safety circuits)
a. Connector locations on the DC controller, AC controller and fixing roller heater safety circuits
6
J201
1
3
J202
J203
LED201
J21s
1D
J215
~
D
J214
!O
1.0
J213 9
J212
~
D
J211:
0
J209 J205 J206 J207 J208 J210
1
0
f:::::\ ~
8
81e:1=2===:::i1 7
Figure 7-6 Connector locations on the
DC controller PCB
D
2 1
J102
CJ
1 5
J106
o:
J103
1 J10I 2
J105
{.------.\0
Figure 7-7 A Connector locations on the
AC controller PCB
o~
J104
0>8101
Figure 7- 7B Connector locations on the
fixing roller heater safety PCB
COPYRIGHT
©
BY CANON INC. CANOll LBP-CX SERIES REY.2 JULY 1985 PRINTED IN JAPAN (IMPRIME AU JAPON)
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