E540; E541 - Oce 3121 Technical & Service Manual

33 E540

Cause
Drive belt for the
lead cam
The bin shift
motor M1
Bin: home sensor
MS1
Lead cam: home
position sensor
PI1
Tray control PBA

34 E541

Cause Step
1
DC control 2
PBA
Shift motor 3
ed.2
Step Checks
1 Does the bin unit move up or
down when SW2 or SW3 is
pressed? (On the tray control
PBA).
2 Is the drive belt correctly fitted? No
3 Disconnect J5 of the tray con-
troller PBA. Is the resistance
between J5-3 and J5-4 on the
harness side about 30 ohm?
4 Disconnect J8 of the tray con-
troller PBA. Is the resistance
between J16-3 and J16-4 × ohm
when MS1 is pressed and 0
ohm when released?
5 Connect to the tray controller
PBA: + to J8-6 and - to J8-5.
Does the meter reading alter-
nate between 5 V and 0 V, when
the lead cam is moving?
Checks
Switch OFF, then ON. Is the tray
now in the forward position?
Connect a meter to J104-7 + and to
J104-3 - on the DC control PBA.
The correct reading is 5V, when the
vane is blocking the sensor, and 0
V when the vane is out of the sen-
sor.
Connect a meter to J104-3 + and to
J104-8 - on the DC control PBA.
There should be continuity. (70 to
80 ohms).
Y/N Action
Yes Go to step 4.
Fit the belt correctly.
No Check the wiring to the
bin motor M1. If undam-
aged, replace the motor
M1.
No Replace the home sensor
MS1
Yes Replace the home posi-
tion sensor PI1
No Replace the tray control
PBA.
Y/N Action
Yes Go to step 4.
No Disconnect and recon-
nect the connector. If the
reading is normal, replace
the DC control PBA.
No Check the wiring; if it is
normal, replace the shift
motor.
Trouble shooting 33