User Guide

RH-4 Company Confidential
BB Description & Troubleshooting CCS Technical Documentation
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Phone is
dead
Start
Is the power key
working?
Measure voltage
from S302. Is it
HIGH?
Check
R306,C310,S30
2 and line. If OK,
change UEM
Measure voltage
from S302 when
pressed. Is it
HIGH?
Check S302. Is
it OK?
Phone is
jammed
Change S302
No No
No
Yes
Yes
Yes
No
Is the volume
UP key working?
Measure ROW0
line from S300.
Is it ~1.8V?
Check S300 and line.
If OK, change Z300.If
still FAIL, change
UPP
Measure COL0
from S300 when
pressed. Is there
50us pulse?
Check S300 and
COL0 line. If OK,
change Z300.If still
FAIL, change UPP
No No
Yes
Change UPP
Yes
No
Is the volume
Down key
working?
Measure ROW1
line from S301.
Is it ~1.8V?
Check S301 and line.
If OK, change Z300.If
still FAIL, change
UPP
Measure COL0
from S301 when
pressed. Is there
50us pulse?
Check S301 and
COL0 line. If OK,
change Z300.If still
FAIL, change UPP
No No
Yes
Change UPP
Yes
No
Continue
Yes
Yes
Yes