Vdc Power (Iit/Ips Lvps) Rap - Xerox DocuColor 12/DCCS50 Service Manual

-12 VDC Power (IOT LVPS) RAP
This RAP is used to repair short circuits in the -12 VDC Power circuit when directed by another
RAP.
Initial Actions
• Use BSD 1.2 in the following procedure:
Procedure
Disconnect P/J22 from the IOT LVPS and check for -12 VDC at P/J22-4. -12 VDC at P/J22-
4 on the IOT LVPS checked OK.
Y N
Replace the IOT LVPS (PL 9.3).
Disconnect the following connectors from their respective PWBs:
• P/J395 from the Half Tone PWB (PL
• P/J411 from the IOT Drive PWB (PL
Reconnect P/J22 to the IOT LVPS, and check for -12 VDC at P/J22-4. -12 VDC is measured
at P/J22-1.
Y N
Go to Flag 7 on BSD 1.2, and check the wires for a short circuit to ground.
Measure for -12 VDC at P/J22-4 after reconnecting P/J395, and
respective PWBs. Note what PWB, if any, loads down the -12 VDC. -12 VDC was OK after
reconnecting P/J395 to the Half Tone PWB.
Y N
Perform the following:
• Go to Wirenet +12/-12V DC involving the Half Tone PWB and disconnect all compo-
nents from the Half Tone PWB which are supplied with -12 VDC.
• Reconnect the components one-by-one to the Half Tone PWB, while checking which
component/circuit loads down the -12 VDC.
• Check the wiring to the suspected component for an open/short circuit.
• Replace the component, which loads down the -12 VDC.
Perform the following:
• Go to Wirenet +12/-12V DC involving the IOT Drive PWB and disconnect all components
from the IOT Drive PWB which are driven by -12 VDC (and not checked earlier in this
RAP).
• Reconnect the components one-by-one to the IOT Drive PWB, while checking which com-
ponent/circuit loads down the -12 VDC.
• Check the wiring to the suspected component for an open/short circuit.
• Replace the component, which loads down the -12 VDC.
Status Indicator RAPs
-12 VDC Power (IOT LVPS) RAP, +13.3 VDC Power
9.2).
9.2).
P/J411 one by one to their

+13.3 VDC Power (IIT/IPS LVPS) RAP

This RAP is used to repair failures in the +13.3 VDC Power (IIT/IPS LVPS) circuit when
directed by another RAP.
Initial Actions
• Use BSD 1.3 in the following procedure:
Procedure
Disconnect P/ J5. Go to Flag 1
on the harness side. ACH is measures between P/ J5-3 and P/ J5-2.
Y N
Go to the AC Power RAP.
Go to Flag 2 on BSD 1.3. Less than +1 VDC is measured at P/J11A-1.
Y N
Go to Flag 3 on BSD 1.3. Less than +1 VDC is measured at P/J11A-13.
Y N
Perform the following:
• Replace the IOT Drive PWB
• Replace the IOT CPU PWB
Replace the AC Driver PWB
Go to Flag 6 on BSD 1.3, and perform the following:
1. Check the wiring from P/J34 on the IIT/IPS LVPS to the PRE IPS and the CCD for an
open/short circuit.
2. Replace the IIT/IPS LVPS
3. Replace the PRE IPS PWB
4. Replace the IIT Driver PWB
1/05
2-8
manuals4you.com manuals4you.com
on BSD 1.3, and check for ACH between P/ J5-3 and P/ J5-2
(PL 9.2).
(PL 9.2).
(PL 9.3).
(PL 3.5).
(PL 3.5).
(PL 3.2).
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