Xerox WorkCentre 5790 Series Service Manual page 299

09-365 Relative Humidity Sensor Failure RAP
09-365 Average humidity reading is out of limits.
Also use this RAP if the relative humidity sensor is suspected of working incorrectly. A faulty
relative humidity sensor can cause image quality problems.
Initial Actions
Ensure that the electricity to the machine is switched off while performing tasks that do
not need electricity. Refer to GP 14. Disconnect the power cord. Electricity can cause
death or injury. Moving parts can cause injury.
Switch off the machine, then switch on the machine,
Procedure
Enter dC330 code 09-365, relative humidity sensor, Q09-365. Press start. Observe the dis-
played state of Q09-365. Figure 1. Open the bypass tray, gently blow on the relative humidity
sensor PWB. Observe again the displayed state of Q09-365. The
changed.
Y N
Go to Flag 1. Check for +5V at P/J7
Y N
Go to:
• 01E +5V Distribution RAP.
• 01B 0V Distribution RAP.
Go to Flag 1. Check for +5V at P/J46
Y N
Check the wiring between P/J7
necessary, REP 1.2.
Install a new relative humidity sensor / ambient temperature sensor, (35 ppm)
Item 4, (40-90 ppm) PL 9.20 Item 4.
If the fault continues, perform OF7
installed, PL 1.10 Item 2.
If possible, check the relative humidity of the external environment using a hygrometer. Com-
pare with a reading from the sensor Q09-365. Refer to the NOTE above
ter is not available refer to Table 1 for the approximate expected humidity value. Compare the
expected values with Q09-365. If the value of Q09-365 is very different from the expected
reading.
Install a new relative humidity sensor / ambient temperature sensor, (35 ppm)
(40-90 ppm) PL 9.20 Item 4.
If the fault continues, perform OF7 IOT PWB Diagnostics RAP before a new IOT PWB is
installed, PL 1.10 Item 2.
If the fault is intermittent, perform the steps that follow:
• Check the wiring, GP 7. Repair if necessary,
• Make sure that the P/Js are correctly and securely connected.
Xerox® WorkCentre® 5790 Family
WARNING
GP 14.
displayed
pin 3 on the IOT PWB. +5V is present.
pin 1. +5V is present.
on the IOT PWB and P/J46, GP 7. Repair wiring as
IOT PWB Diagnostics RAP before a new IOT PWB is
Table 1. If a hygrome-
PL 9.22 Item
REP 1.2.
NOTE: The actual value is not critical. If the reading from Q09-365 is approximately within the
range indicated in column 4,
External Average relative
environment humidity
Wet 80%
Ambient 50%
Dry 10%
state has
PL 9.22
4,
May 2013
2-267
Table 1, the sensor is good.
Table 1 Relative humidity values
Cold machine relative Warm machine relative
humidity humidity
80% 40% to 50%
50% 15% to 30%
10% 1% to 7%
P/J46
Figure 1 Component location
Relative humidity
sensor Q09-365 /
ambient temperature
sensor Q09-375
Status Indicator RAPs
09-365