Xerox 3050 Service Manual page 232

1.4 Main Power Interlock RAP
Ensure that the Actuator on the
(12 Feb 92)
Upper Rear Cover correctly actuates
the switch.
Use this RAP to locate problems in the
interlock circuitry that controls the coil
Procdure
circuit for the Main Power Relay (K1).
Switch off, then switch on, the copier.
Except for the Media Feed
Interlock
CR24
on the
LVpS/
Driver
PWB (A2)
1 s lit,
Switch (S29), each interlock switch in the
Y
chain has two poles. One set of poles is
connected in series with the Media Feed
Shelf lnterlock Switch and to the coll of the
Main Power Relay (K1).
The other pole on each switch Is individually
connected to
+
26 VDC
and to the logic.
When the switch is opened, the
+
26 VDC
is
removed from logic, telling the logic which
interlock switch was opened. The logic then
displays a status code.
The
+
26 VDC output from the single pole of
I
the Media Feed Shelf lnterlock Switch is also
monitored by the logic; the loss of this signal
produces status code
(E5.051
if the copier is in
the run mode at the time.
The problem may occur
If
there
i s
a
malfunction in one of the poles, that i s wired
in series, of any of the interlock switches or
in the associated wires.
NOTE:
The
component locator drawings and
the circuit diagram ere on the following
pages.
Initial Actions
Check the Connectors on each
interlock switch for damage, and
ensure that each connector
is
seated
correctly.
Check that all the following interlock
switches are actuated:
Right Side Door
Upper Rear Cover (Developer Cover)
e
Document Handler
Cutter Cover.
On copiers WtTagIMOD: 28, ensure that
plug S23 PIJ 1 is seated correctly.
Set the DMM to read
+
26 VDC. Connect
the
(-)
lead to frame ground.
Check that
+
26 V D C is present at each of
the following places:
Connector lnterlock Swltch
A2 P 2 16-9 Right Side Door
A2 P201-8 Developer Cover
A2 P201-15 Document Handler
A2P2
1 1-1
2 Cutter Cover
If
+
26 VDC i s not present at the indicated
pin, check the indicated interlock switch
for continuity while you manually actuate
the switch.
If the switch does not have continuity,
replace the switch. If the switch has
continuity, check the associated wires for
an open circuit.
A
Set the DMM to read 26 VDC. Connect the
(
+
)
lead to A2 P 2
12-5.
Connect the
(-)
lead to
frame ground.
There is
+
26
VDC.
Y N
I
Replace the LVPSl Driver P W B (A2).
Go to FLAG 1 and check the wires for
continuity. If the wires are good, replace the
Main Power Relay
(K1).
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1.4 Main Power Interlock RAP
2-1 40 3050