Ac And Dc Power Service Check - Lexmark 13P0195 - C 750dn Color Laser Printer Service Manual

5060-00x

AC and DC power service check

Before proceeding with this service check remove or disconnect any options that may be installed. Turn the
machine on. If it operates correctly, reattach one option at a time until the failing option is located.
Note: Before proceeding with this service check turn the printer on and check to see if the Power on LED on the
engine board is turned on.
Step Actions and questions
1 Is the Power on LED on the engine board turned on?
AC power service check
The printer appears to be inoperative when turned on with the Power on/Status LED off, the LCD
display is blank, the Fuser lamps do not come on and no motors turn.
Step Actions and questions
1 Main AC power—make sure the printer is receiving
main AC power.
Is the printer receiving AC power?
2 AC power check (wall outlet)—check the AC line
voltage at the AC outlet.
Is the AC line voltage correct?
3 AC power cord.
Is the power cord in good condition?
4 AC Power—Is the power cord plugged into an
approved AC outlet. It should not be plugged into a
power strip or interruptible power supply.
Is the power cord plugged into a correct AC outlet?
5 AC power check (AC line cord)—check the AC line
voltage at the end of the AC line cord.
Is the AC line voltage correct?
6 Low voltage power supply—turn the power off and
disconnect the LVPS from the RIP and engine boards.
Check for +5 V dc on the LVPS cables. engine board
+5 V dc: J9-2 and J9-3. RIP board +5 V dc: J23-13,
J23-14, and J23-15.
Is there approximately +5 V dc on all of these
connector pins?
2-112
Service Manual
Yes No
Go to "AC power Go to
service check" on service check" on
page 2-112. page
Yes No
Go to step 2 Inform the
customer that AC
power to the printer
is incorrect.
Go to step 3 Inform the
customer that the
AC line voltage is
incorrect
Go to step 4 If the cord is in
poor condition,
replace the cord
Go to step 5 Plug the power
cord into the
correct AC outlet. If
an outlet is not
available, inform
the customer.
Go to step 6 Replace the line
cord
Go to "DC power Replace the LVPS.
service check" on See
page 2-113. power supply
(LVPS) removal"
on page
"DC power
2-113.
"Low voltage
4-38.