Nokia 6150 Service & Repair Hints page 37

Figure 13: Sleepclock signal
No RX (no rx calibration...RSSI reading fixed value)
MAD / COBBA / R263 faulty
•
Check if the 13MHz IF frequency on pin 22,23 COBBA change the amplitude if the generator frequency level
are change
•
Check if the RXC impulse on pin 36 N600 (SUMMA) change the amplitude if the generator frequency level
are change
•
Check R263 if any or low signal are measurable
•
Change MAD
•
Change COBBA (Think about SIM-LOC data and new update after change it)
No RX (no rx calibration...RSSI reading high difference)
Z560 Duplexer faulty / poor soldering
•
Check the rx signal on the ANT pin and on the out going pins RX-G or RX-D
•
Check that the signal attenuation between duplexer "in" and "out" is around 2dbm-5dbm depending on the
receiver band
•
Resolder the duplexer or change it
No RX (no rx calibration...RSSI reading highest value)
Z600 / Z601 faulty / poor soldering
•
Check the 73MHz IF frequency on Z600
•
Check the components C511, C512, L503, L504 if the signal amplitude is different between the two lines
•
check the soldering of Z600 or change it
•
check the 13MHz IF frequency on Z601, around 3dbm attenuation between signal-in and signal-out
•
check the soldering of Z601 or change it
version 1.0 / 19.10.1999
CONFIDENTIAL Service & Analysis Center Europe
Training Team
Page 37 of 41