Xerox DocuColor 12/DCCS50

1/05
2-8
DocuColor 12/DCCS50
-12 VDC Power (IOT LVPS) RAP, +13.3 VDC Power
Reissue
Status Indicator RAPs
-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.
YN
Replace the IOT LVPS (PL 9.3).
Disconnect the following connectors from their respective PWBs:
• P/
J395 fr
om the Half Tone PWB (PL 9.2).
• P/J411 fro
m the IOT Drive PWB (PL 9.2).
Reconnect P/J22 t
o the IOT LVPS, and check for -12 VDC at P/J22-4. -12 VDC is measured
at P/J22-1.
YN
Go to Fl
ag 7 on
BSD 1.2, and check the wires for a short circuit to ground.
Measure for -12 VDC at P/J22-4 a
fter reconnecting P/J395, and P/J411 one by one to their
respective PWBs. Note what PWB, if any, loads down the -12 VDC. -12 VDC was OK after
rec
onnecting P/J395 to the Half Tone PWB.
YN
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
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.
Perform the following:
• Go to Wirenet +12/-12V DC involving the IOT Drive PWB and disconnect all components
fro
m 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 I
OT
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.
+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 BSD 1.3, and check for ACH between P/ J5-3 and P/ J5-2
on the harness side. ACH is measures between P/ J5-3 and P/
J5-2.
YN
Go to the AC
Powe
r RAP.
Go to Flag 2 on BS
D 1.3. Less than +1 VDC is measured at P/J11A-1.
YN
Go to F
lag 3 on BS
D 1.3. Less than +1 VDC is measured at P/J11A-13.
YN
Perform the following:
• Replace the IOT Drive PWB (PL
9.
2).
• Replace the IOT CPU PWB (PL 9.
2).
Replace the AC Driver PWB (PL 9.3).
Go to Flag 6 on BS
D 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 c
ircuit.
2. Replace the IIT/IPS LVPS (PL 3.
5).
3. Replace the PRE IPS PWB (PL 3.5).
4. Replace the IIT Driver PWB (PL 3.2).
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