Lexmark 13P0150 - C 750dtn Color Laser Printer Service Manual page 69

Step Actions and Questions
3
Disconnect the VTB fan from J4 on the Engine Board and
check the voltages on J4 (refer to Table 2).
Are the voltages correct?
Table 2
Connector
Fan On
Pin No.
J4-1 +1.6 V dc
J4-2 0 V
J4-3 +3.1 V dc
J4-4 +24 V dc
Error Code 927
RIP Fan Service Check
Step Actions and Questions
1
Turn the power off and manually spin the fan and check that
it rotates freely.
Does the fan rotate freely?
2
Check the RIP Fan Cable connection to the Engine Board,
J2 for correct installation.
Is the cable installed correctly?
3
Disconnect the RIP fan from J53 on the Engine Board and
check the voltages on J53 (refer to Table 3).
Are the voltages correct?
Table 3
Connector
Fan On
Pin No.
J53-1 +1.6 V dc
J53-2 0 V
J53-3 +1.9 V dc
J53-4 +24 V dc
5060-XXX
Fan Disconnected
Fan Off
Fan Switch On
+3.3 V dc +3.3 V dc
0 V 0 V
0 V dc 0 V
+24 V dc +24 V dc
Fan Disconnected
Fan Off
Fan Switch On
+3.3 V dc +3.3 V dc
0 V 0 V
0 V dc 0 V
+24 V dc +24 V dc
Yes No
Replace the Replace the
"VTB Fan" on "Engine
page 4-37 Board" on
page 4-13
Fan Disconnected
Fan Switch Off
+3.3 V dc
0 V
+2 V dc *
+24 V dc
Yes No
Go to Step 2 Replace the
"RIP Fan" on
page 4-34
Go to Step 3 Install the
cable
correctly.
Replace the Replace the
"RIP Fan" on "Engine
page 4-34 Board" on
page 4-13
Fan Disconnected
Fan Switch Off
+3.3 V dc
0 V
+2 V dc
+24 V dc
Diagnostic Information
2-49