CONFIDENTIAL
Service & Analysis Center Europe
Training Team
version 1.0 / 19.10.1999 Page 37 of 41
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
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