User Guide

CCS Technical Documentation BB Description & Troubleshooting
Company Confidential RH-4
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No
Continue
Are the TP
Module keys
working?
No
Change TP Module.
Are the keys working
now?
Retest failing
TP Module
Yes
Check X305 (solder
joints). Is it OK?
Change X305No
Measure ROW0 and
ROW1 lines from
X305. Are voltage
level ~ 1.8V?
Measure SLEEPX-
signal fom testpoint
J403 when key is
pressed.
Is voltage level ~
1.8V?
When keypad is
pressed, are the
LED’s turned on?
Illumination
fault
Continue
Check lines ROW0
and ROW1 from
X305. If OK, change
Z300. If still fails,
change UPP
No
Yes
Yes
Yes
No
No