Xerox 3050 Service Manual page 59

B C
I
Go to the E5.04 RAP.
NOTE: In the next step the Cutter Home
Sensor connector (01 PI) must be
disconnected. +26 VDC is present
momentarily, when the code LO7231 is
entered and the Start button ispressed.
In order t o obtain an accurate
measurement, set the Multimeter t o V,
DC, PEAK HOLD,
+ ,
200V. Connect the
(
+
)
lead to A2 P211 pin 1 of the LVPSI
Driver PWB. Connect the
(-)
lead t o the
GND test point. Enter the code [0723] in
order to check the motor signal.
There is approximately
+
26 VDC at pin 1
of A2 P211 when
the
motor is energized.
Y N
I
Replace the LVPSI Driver PWB (A2).
Go t o FLAG 2 and FLAG 3, check for an
open circuit in the wires to the Cutter
Drive Motor connector.
If there is no open circuit, manually
rotate the Cutter Bar in order t o ensure
that the Cutter bar rotates without
binding.
If the bar is binding, clean the control
cams and stationary blade in the area
where the blade is i n contact with the
cams. Then, lubricate the cams with a
small amount of Molykote 557 (USO, XCI,
XLA 70H37; R X 70P61).
If the problem continues, replace the
Cutter Drive Motor (MOT 1).
D
LVPSI DRIVER PWB (A2)
Press the Stop button. Prepare t o check the
feedback signal that is generated by the
Cutter Drive Motor tachometer. The
tachometer generates a voltage.
Set the
Multimeter t o V, DC, PEAK HOLD,
+,
20 V.
Connect the ( + ) lead t o A2 P211 pin 2 of the
LVPSI Driver PWB. Enter the code [0723] i n
order t o check the tachometer feedback
signal.
The voltage is approximately (
+
5.0 VDC at
pin 2 of A2 P 2 l l when the motor is
energized.
N
Go t o FLAG 3 and check for an open
circuit i n the wire to the Cutter Drive
Motor connector.
If there is no open circuit, replace the
Cutter Drive Motor (MOT
1).
Ensure t o
reconnect the Cutter Home Sensor
connector (Ql PI).
Replace the LVPSI Driver PWB (A2). Ensure to
reconnect the Cutter Home Sensor connector
(Q1 P1).
110)
. . I
LVPS PWB
12/97
2-1 9~
LL.30 Cutter Fault (WITagl MOD 31) RAP