HP 750 - Manual (Page 156)

700
750C
750C
Plus
755
CM
8-38 Troubleshooting C4705-90000
10 If you want to perform the open sensor test, then at step 5 press the Down Arrow.
11 The Testing open sensor in black mode" message is displayed on the frontĆpanel.
12 When the test is completed, the blk false #/2000" message is displayed on the
frontĆpanel.
13 The Testing open sensor in black mode" message is displayed on the frontĆpanel.
14 The Testing open sensor in color mode" message is displayed on the frontĆpanel.
15 When the test is completed, the blk false #/2000 / clr false #/2000" message is displayed
on the frontĆpanel.
If the blk or clr false value (#) is less than 5 then press Enter.
If the blk or clr false value (#) is more than 5 then the test has failed.
Go to step 16 to
troubleshoot the problem.
16 If any of the drop detector tests fail:
1 Check if the drop detector cable is connected to the main PCA.
2 Try replacing one of the following components:
D Service Station (which includes the drop detector assembly) ' page 6Ć42.
D Cable assembly ' page 6Ć47.
D Power Supply PCA ' page 6Ć11.
D Main PCA ' page 6Ć9.
Only replace one component at a time and perform the “Drop Detector” test again before
replacing another component. Using this procedure you will be able to determine exactly which
component failed.