J Power On And Lvps Control Signal Rap - Xerox WorkCentre 5687 Series Service Manual

01J Power On and LVPS Control Signal RAP

Use this RAP to check and identify power on and standby signals from the LVPS.
Ensure that the 01C AC Power RAP is performed before starting this RAP.
Procedural Notes
NOTE: Short circuit or overload of +3.3VSB (standby) will result in all the LVPS outputs off.
Short circuit or overload of +3.3V or +5V will result in all the LVPS outputs off, except +3.3VSB.
NOTE: For an explanation of the LEDs on the IOT PWB and their function, go to OF7 IOT
PWB Diagnostics RAP.
NOTE: +3.3VSB (standby) is generated from the LVPS when the machine is connected to the
AC supply. +3.3VSB is required to initialize the machine from standby to power on.
Procedure
Ensure that the machine is switched off, GP 14. Remove the rear cover, PL 8.10 Item 1.
Reconnect the power cord. Check CR36, Figure 1. CR36 is on.
Y N
Go to Flag 3. +3.3VSB is available at P/J27, between pin 6 and pin 14, on the IOT
PWB.
Y N
Disconnect P/J27. +3.3VSB is available at the disconnected end of the harness,
P/J27, between pins 6 and 14.
Y N
Go to 01C AC Power RAP.
Check the harness and connector P/J27, if necessary repair the harness/connector
or install a new LVPS and base module, PL 1.10 Item 3.
Check the pin to pin connections of P/J27. If the connections are good, install a new IOT
PWB, PL 1.10 Item 2. Perform OF7 IOT PWB Diagnostics RAP before a new IOT PWB is
installed.
Go to Flag 1. Monitor the voltage at P/J5, pin 19. Press the on/off switch, PL 1.10 Item 8.
The voltage changes to 0V.
Y N
Check the wiring to the switch, GP 7. If necessary, repair the wiring or install a new on/off
switch, PL 1.10 Item 8.
Monitor the voltage at P/J26, pin 7. Switch off the machine, then switch on the machine, GP
14. Go to Flag 2. The voltage changes from +2.3V to 0V.
Y N
Perform OF7 IOT PWB Diagnostics RAP before a new IOT PWB is installed, PL 1.10 Item
2.
Go to the 01H Short Circuits and Overloads RAP.
WorkCentre 5687 Family
Figure 1 LED location on IOT PWB
August 2007
2-55
Status Indicator RAPs
01J