Nokia 3210 Repair Manual page 34

Customer Care Europe & Africa
Technical Services Training Group
INTERNAL AUDIO FAILURE
Internal audio failure
Speaker does not work
(received audio)
Microphone
does not work
Change
N200 COBBA
© 2001 Nokia Mobile Phones
Check
connection L202, L203
Yes
to speaker pads
(0 Ohm)
OK
Check the mechanical
appearence and
impedance of speaker
(around 30 Ohm)
Check contact springs
Yes and impedance of microphone
(800 Ohm)
Ok
Check microphone bias
voltage 1.7V at C242
(audio loop enable)
Ok
Check audio signal
at C258, C259
Ok
Check 2.8V DC VBB at C117
and 2.8V DC VCOBBA at C248
Ok
Check
COBBACLK 13MHz 3.6Vpp at
OK
J201and COBBARESET at J343
during initialization
CONFIDENTIAL
NSE-8/9
Date: 05.09.2001
Change L202 or L203
nOK
Change speaker
nOK
Change microphone
nOK
Check voltage at R214
nOK
Follow signal back to
nOK
the microphone
continue with CCONT
nOK
chapter on page #17
Swap the phone because
MAD or PCB might
nOK
be the reason
Checked by:
CC Training Group
34 (48)
Repairhints
Version 5.0 Approved
Check resistance
between lines and
nOK
GND: >1MOhm
Change COBBA
(N200)
Check if the
nOK
connection X503 to
PCB is soiled
Change N200
nOK
COBBA
Approved by:
Technical Services