CONFIDENTIAL
Service & Analysis Center Europe
Training Team
version 1.0 / 19.10.1999 Page 38 of 41
No RX (no rx calibration…RSSI reading highest value)
N600 SUMMA faulty / poor soldering
• check the UHF- and VHF oscillator frequency
• check the control-lines for the PLL, pin 5, 6, 7 from N600 (see the diagrams below)
• check the UHF-VC on pin 21 N600 1,9V-3.2V depending of the channel
• check the VHF-VC on pin 12 N600 2,6V
• check the 5V VCP supply voltage drop over R606 (normal 0,2V)
• change the N600 SUMMA
Figure 14: PLL-SCKL Signal
Figure 15:PLL-SDAT Signal
Figure 16:PLL-SENA Signal
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