Advertisement
lunedµ 20 dicembre 1999
note: all the signal & voltage present
in this procedure has to be clear and
at correct level ; compare them with a
good pcb
Supply pcb using pcb test cable
cod.AE20101903, set pcb in test mode and
434# audio on speaker / headset way
Insert on J504 headset connector an headset
jack and check if 1KHz tone is udible on
Check for missing , dry joint
R1506 , C611 , R961 , C951 ,
NOTE: check if any components mentioned is correctly
positioned , has not dry joint and is not damaged . If all is ok
replace it . If problem is still the same send BOARD IN htc.
digit test commands:
481000# 1 KHz tone enabled
4707# max volume audio
headset speaker
NO
Is SPKR- signal
at 0,5 Vpp , 1,4
Vcc offset
present on
R1506?
YES
or unsoldered issues on:
C952 , L1005 , J504.
- MOTOROLA CONFIDENTIAL PROPRIETARY -
Dual band Modulus 3 level 3 debug rev 1.0
YES
Check SPKR- line for track between
R933 and R1506.
NO
Else , check for 0,6v presence on VR
977 with jack on and 2,7 V with jack
off ,in this way problem can be "
HEAD_INT " line faulty,check for
this VR977 , R977 , L1004 ,J504.
NO AUDIO RX
on headset ,
speaker ok
Check J504 ,
U900 for any
intermittent
issue
Page 15
Advertisement
