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CONFIDENTIAL
Service & Analysis Center Europe
Training Team
version 1.0 / 05.11.1999 Page 20 of 37
Buzzer failures
B400 / board connections broken
•
Check the buzzer control signal from the MAD on pin 3 of N400 2,8Vpp 1KHz (use WINTESLA / testing / audio
Level 1, 1000Hz)
•
Check VDC_OUT 3,9V DC pin 1 N400 and "+" of buzzer
•
Check VBB 2,8V DC on pin 2 N400
•
Check the buzzer Signal on "-" of buzzer ≈ 5Vpp 1KHz
•
Check the board connection pin 6 of N400 to "-" of buzzer
•
Change the buzzer
Buzzer failure
check buzzer control signal
from MAD 2,8Vpp on N400
pin 3, use WINTESLA /
testing / audio / level 1,
1000Hz
check buzzer signal 5Vpp
on pin 6 of N400 and "-" of
B400 (use same settings)
Check 3,9V DC VDC_OUT
on pin 1 of N400 and "+" of
B400
Check connection to
VDC_OUT on V105 pin 1,
16
check VBB 2,8V DC on pin
2 of N400
oK
oK
not oK
swap the phone because
MAD or PCB should be the
reason
Check connection to VBB
2,8V DC on C117
change N400change B400
not oK
not oK
oK
oK
not oK