User Guide
RH-4 Company Confidential
BB Description & Troubleshooting CCS Technical Documentation
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Are the Flip
keys working?
No
Change A-Cover
Assy. Are the keys
working now?
Retest failing
A-Cover Assy.
Yes
Check X307 (solder
joints). Is it OK?
Change X307No
End
No
Yes
Measure ROW2,
ROW3 and ROW4
lines from X307. 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
Check lines ROW2,
ROW3 and ROW4
from X307. If OK,
change Z300. If still
fails, change UPP
Yes
Yes
No
N
o
No
Check L303 - l309
(solder joints).
Are they OK?
Change defect
part
No
Yes