Nokia NSD-1 SERIES, Руководство по разборке и устранению неисправностей

Страница: 38 / 38

NSD–1
Disassembly / Troubleshooting Instructions
PAMS Technical Documentation
Page 38 Issue 2 09/00
Nokia Mobile Phones Ltd.
Test Point values
NOTE: Test Point layout pictures are at the back of the binder.
Test Point
Designator
Signal Name General Characteristics General Signal Destination
100 AFC VCTCXO Control voltage PDM from MAD4
101 VR1 2.7v supply to VCTCXO CCONT to VCTCXO
102 19.2 MHz 19.2 MHz from VCTCXO buff-
er VCTCXO Buffer to CAFÉ and
PLL IC’s
103 TX_LIM_ADJ Detector demand voltage PDM from MAD4 Pin 128 de-
tector circuit at RF output
104 800 MHz PA
Output
RF output from PA check for
short with phone switched
OFF RF output from PA to Isolator
105 Tx VHF LO VHF LO to TIF
(PCS 416.2 MHz / CELL
CDMA 346.2 MHz / AMPS
347.1 MHz) LO from PLL to TIF IC
106 Tx UHF LO
1 GHz
UHF LO to Odyssey up con-
verter IC LO from 1 GHz VCO to Odys-
sey up converter IC
107 Rx VHF LO 256.2 MHz VHF LO to RIF LO from PLL to RIF
108 LIM_P 450 KHz signal from RIF RIF 450 KHz output to CAFÉ
109 RSSI dc voltage indicating signal
level into receiver RIF output to CCONT Pin A1
A to D converter
110 LIM_P 450 KHz signal into CAFÉ RIF 450 KHz output to CAFÉ
111 RX_GS 0v or 2.7v for LNA OFF or ON Voyager down converter LNA
control from MAD4 Pin 2
112 RX_IF_AGC Dc voltage proportional to sig-
nal level into receiver in
CDMA mode AGC control voltage from
MAD4 Pin 133 to RIF Pin 7
113 1900 MHz PA
Output
RF output from PA
Check for short with phone
switched OFF RF Output from PA to Isolator
114 FILT_SEL 0v or 2.7v for PCS High band
or Low band Filter control line from MAD4
Pin 129
115 Tx UHF LO
2GHz
UHF LO to Apache
Up converter IC UHF LO from VCO to Apache
up converter N601 Pin 6
116 Penta P5 0v or 2.7 from Penta P5 to
PCS LNA for LNA OFF or ON Control for PCS LNA from
Penta N303 Pin 9