Nokia 3210 Repair Manual page 41

Customer Care Europe & Africa

Technical Services Training Group

N200 COBBA faulty

Check 13MHz IF at N700, pin 23, 24 – if the generator level (-80dBm....-105dBm) is changing - amplitude of IF must also change

Check RXC signal at N700, pin 36 – if the generator level is changed – the amplitude of signal must also change

Check R725 if these signals are not measurable or too low in amplitude – see diagram below

Check VBB 2.8VDC at C117 (near CCONT)

Check VCOBBA 2.8VDC at C248 (near COBBA)

Check COBBACLK at J201: 3.6Vpp – see diagram below

If all signals and voltages are ok – set the phone in call mode with CMU/CMD

Check the RX/TX values while knocking (with a nonmetallic item) around COBBA

If any error appears – probably broken solderings under COBBA - change N200 if possible (if not underfilled)

If the errors persist after rework of COBBA – MAD or PCB might be the reason

NOTE:

If COBBA or MAD is underfilled – swap the phone, because these components are not changeable!

If COBBA was changed - SIMlock and IMEI entries must be rewritten with NOKIA Security Password, if this

procedure is permitted to you!

CONFIDENTIAL

NSE-8/9

Date: 05.09.2001

Checked by:

CC Training Group

41 (48)

Repairhints

Version 5.0 Approved

Approved by:

Technical Services