Xerox 3001 Service Manual page 177

CQ 27 Exposure RAP
This RAP is used if there is no exposure or an
excessive amount of exposure. No exposure
will give a black copy and an excessive amount
of exposure will give a washed out copy.
Initial Actions
Ensure that connectors P I 1 of the Control PWB
and P21 and P22 of the lamp ballast are
connected correctly.
Ensure that the exposure lamp sockets are not
damaged.
Ensure the opening in the Exposure Lamp is
facing the lllumination Sensor.
Do not leave the exposure lamp on for
an extended amount o f time. The drum
could be damaged by the light shock
Enter the code [15]. The Exposure Lamp
lights.
Y
N
The lamp filaments are on
Y N
There is
+
0.7 VDC between pins 4 (
+
)
and 3
(-)
of PI 1 on the Control PWB.
Go t o FLAG 1 and check the wiring
between the Control PWB and the
lamp ballast for an open circuit.
I
If there is no open circuit, replace
the Control PWB.
Replace the Lamp Ballast.
B
There is
+
24 VDC between pins 6 ( +)and
3 (-) of PI1 on the Control PWB.
Y N
Go t o FLAG 1 and check the wiring
between the Control PWB and the
lamp ballast for an open circuit.
If there is no open circuit, replace the
Lamp Ballast.
Press Stop then Start. The voltage
between pins 6 (
+
) and
3 (-) of
PI I on the
Control PWB goes from
+
24 VDC t o
+
0.6
VDC.
I
Replace the Control PWB.
Replace the lamp ballast.
If the problem still exists, replace the
exposure lamp.
D
Connect the multimeter (
+
) t o PI 5-5.
Block and unblock the lllumination
Sensor.
C
Return the value displayed in code [5] t o the
value recorded earlier. Perform the Elect-
rostatic Series (ADJ 9.2).
Connect the multimeter (
+
)
t o P I 1-7 on the
Lamp Ballast PWB and connect
(-)
t o ground.
WARNING
There will be a time delay between the time
the code [5] is entered and the time the main
drive motor starts t o turn. The motor will not
start until the fuser is at the correct
temperature.
Enter the code [5] and write down the value
displayed. Observe the multimeter. Scroll t o
a value of 9, continue scrolling past 9 t o a
value of 1.
The voltage decrease when code [51 is
scrolled from 9 t o I .
The voltage changes approximately 2 t o
3 VDC.
Y N
I
Replace the lllumination Sensor.
Replace the Control PWB.
CQ 27 Exposure RAP