HP 750 - Manual (Page 155)

Troubleshooting C4705-90000 8-37
17. Drop Detector
The purpose of this test is to:
D Checkthe test signal.
D Checkif the drop detector is sensing ghost drops due to noise interference.
D Verify that the drop detector senses correctly.
The drop detector test performs these two tests:
D Blocked sensor test.
D Open sensor test.
Perform the drop detector test as follows:
1 In the Service Tests submenu, scroll to 17 Drop detector " and press Enter.
SERVICE TESTS
17 Drop detector
2 If the Drop DT Status: Good / Press Enter" message is displayed on the frontĆpanel,
then press Enter and go to step 4 to continue with the test.
3 If the Drop DT Status: Bad / Press Enter" message is displayed on the frontĆpanel, then
go to step 16 to troubleshoot the problem. Press Enter if you want to continue with the
test.
4 The Blocked Sensor Test / Open Sensor Test" message is displayed on the frontĆpanel.
5 Press the Up Arrow to perform the blocked sensor test.
If you want to perform the open sensor test, then go to step 10.
6 The Press Enter then Blocksensor" message is displayed on the frontĆpanel and
carriage moves to the right side of the plotter. Press Enter.
7 When the BlockSensor Now!!" message is displayed on the frontĆpanel, blockthe drop
detect sensor, which is located in the service station.
8 If the test passes, the Sensor Good / Press Enter" message is displayed on the
frontĆpanel.
9 If the test fails, the Sensor Bad / Press Enter" message is displayed on the frontĆpanel.
Go to step 16 to troubleshoot the problem.
The test is continued on the next page.