Xerox DocuColor 12/DCCS50, Service Manual

Page: 45 / 1617

1/05
2-9 DocuColor 12/DCCS50
+24 VDC Power (IOT LVPS) RAP
Status Indicator RAPs
Reissue
+24 VDC Power (IOT LVPS) RAP
This RAP is used to repair short circuits in the +24 VDC Power circuit when directed by another
RAP.
Initial Actions
• Use BSD 1.2 in the following procedure:
Procedure
Disconnect P/J23 from the IOT LVPS and check for +24 VDC at P/J23 -1,2,3 on the IOT
LVPS. +24 VDC at P/J23 -1, 2, 3 on the IOT LVPS ( PL 9.3 ) checked OK.
Y N
Replace the IOT LVPS ( PL 9.3 ).
Disconnect the following connectors from their respective PWBs:
•
P/J800 from the Tray PWB ( PL 9.3 )
• P/J14 from the AC Driver PWB ( PL 9.3 ).
• P/J411 from the IOT Drive PWB ( PL 9.2 ).
Reconnect P/J23 to the IOT LVPS ( PL 9.3 ) and check for +24 VDC at P/J23 -1,2,3. +24 VDC
is measured at P/J23 -1,2,3.
Y N
Go to BSD 1.2, Flag 1 , Flag 2 and check the wires for an open circuit or a short circuit to
ground.
Measure for +24 VDC at P/J23 -1,2,3 after reconnecting P/J800 , P/J14 , and P/J411 one by
one to their respective PWBs. Note what PWB, if any, loads down the +24 VDC. +24 VDC
was OK after reconnecting P/J800 to the Tray PWB.
Y N
Perform the following:
•
Go to Wirenet +24 VDC involving the Tray PWB and disconnect all components from
the Tray PWB which are driven by +24 VDC.
• Reconnect the components one-by-one to the Tray PWB, while checking which com-
ponent/circuit loads down the +24 VDC.
• Check the wiring to the suspected component for an open/short circuit.
• Replace the component which loads down the +24 VDC.
+24 VDC was OK after reconnecting P/J14 to the AC Driver PWB.
Y N
Perform the following:
•
Go to Wirenet +24 VDC involving the AC Driver PWB and disconnect all components
from the AC Driver PWB which are driven by +24 VDC.
• Reconnect the components one-by-one to the AC Driver PWB, while checking which
component/circuit loads down the +24 VDC.
• Check the wiring to the suspected component for an open/short circuit.
• Replace the component which loads down the +24 VDC.
Perform the following:
•
Go to Wirenet +24 VDC involving the IOT Drive PWB and disconnect all components from
the IOT Drive PWB which are driven by +24 VDC.
• Reconnect the components one-by-one to the IOT Drive PWB, while checking which com-
ponent/circuit loads down the +24 VDC.
• Check the wiring to the suspected component for an open/short circuit.
• Replace the component which loads down the +24 VDC.
Disconnect P/J24 from the IOT LVPS and check for +24 VDC at P/J24 -2,3. +24 VDC at P/
J24 -2, 3 on the IOT LVPS ( PL 9.3 ) checked OK
Y N
Replace the IOT LVPS ( PL 9.3 ).
Perform the following:
•
Disconnect P/J14 from the AC Driver ( PL 9.3
)
• Check for +24 VDC at P/J24 -2,3 at the IOT LVPS ( PL 9.3 ).
• Go to BSD 1.2, Flag 3 , and check for open/short circuits.
• Reconnect P/J23 to the AC Driver ( PL 9.3 ) and check for +24 VDC at P/J23 -1,2,3.
• Go to Wirenet +24 VDC involving the AC Driver PWB and disconnect all components from
the AC Driver PWB which are driven by +24 VDC (and not checked earlier in this RAP).
• Reconnect the components one-by-one to the AC Driver PWB, while checking which
component/circuit loads down the +24 VDC.
• Check the wiring to the suspected component for an open/short circuit.
• Replace the component which loads down the +24 VDC.
• Go to the Interlock Relay Failure RAP . Check for a short circuit of +24 VDC.