Fault Finding Chart For Vhf Vco - Nokia NSB-1 Series Troubleshooting Instructions

PAMS
Technical Documentation

Fault finding chart for VHF VCO

–RX cont mode.
N
PLUSSA pin 8:
800MHz
P:0dBm
VSYN_A–signal
from R708:2.8V
Check R708,C714
PLUSSA pin 18
C707,R712,R729.
Voltage in R729:
Original 06/98
Check
C709
N
Check
Goto BB
troublesh.
and C716.
Check PLUSSA (N401)
N
pin 54 (SCLK):2.8V
pin 55 (SDATA):2.8V
(PD):2.2V
pin 56 (SENA):2.8V
SENA is 0 during SCLK
Check
2.25V
N
Signal VSYN_D
PLUSSA pin
troublesh.:Check
9,22 and
R715 and
25:2.75V
R716:2.8V
Check
Change
R715,R716,C7
module G702
28 and C735
Troubleshooting Instructions
N
and SDATA
Change
PLUSSA
N
Goto BB
troublesh.
NSB–1/3
Goto BB
troublesh.
Page 17