CONFIDENTIAL
Service & Analysis Center Europe
Training Team
version 1.0 / 19.10.1999 Page 36 of 41
Low receiver signal strength indicator
Antenna faulty / wrong - Tuning
• Check the code of the antenna label (see below)
• Check the receiver signal indicator with a new antenna
• Retune the handset
Figure 123: Antenna codes
NMP
CODE
DESCRIPTION
TYPE CODE
(Stamped in
helix antenna)
NOTE
0660178 ANTENNA FXD
890-960/1710-1880 MHz
DGPxxxxx NSM-1*
0660160 ANTENNA FIXED HELIX
890-960 MHz
SGSxxxxx NSE-1/3*
0660145 HELIX 1710-1880 MHz PCN SPNxxxxx NSK-1/3*
No service
13MHz VCTCXO G650 out of range
• Check the 13MHz reference frequency pin 15 N600 (SUMMA) or pin 2 from G650, set first the module in
service mode, a frequency error higher +-50Hz can create deviation of the IF frequencies
X560 Antenna connector mechanical faulty
• Check the handset with the external antenna
• Check the resistor "0Ohm" from the internal antenna pad to the "in" pin from X560
B100 32,768KHz crystal
• Check the amplitude of the 32,768KHz square wave on pin 48 from CCONT
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