Nokia NPM-10 Series Troubleshooting Instructions page 25

CCS Technical Documentation
Measure Power Measure TX
on ANT with input power
No
Power Meter or at TX1 pin
RCT of Z700:
> 31 dBm Power ~ 32 dBm
Yes
Yes
With Scope check
Check R759, on Ant. switch
L702 Vant1 = 2.4 to 2.8V
Vant2 = 0 V
Yes
Check Z700
( Antenna switch )
Issue 1 03/2003
Measure Pout Measure Pin
No
No
at pin 6 of PA: at pin 7 of PA:
33 dBm ~ 0 dBm
Yes Yes
With Scope
check
Check L709
VPCTRL_G at
( Coupler )
pin 8 of N700:
( See figure 18 )
Yes
Check N700
( PA )
With Scope
check TXC
( See figure 18 )
Yes
Check V700
( detector )
+
discretes around
Figure 17: GSM850 transmitter troubleshooting chart
GSM850 band, Power level 5, Channel 190
Black trace: Txp
Green trace: Vpctrl @ R713 input
Blue trace: Vpctrl_G @ R713 output
Red trace: TXC
Figure 18: TXP, VPCTRL_G and TXC
Nokia Corporation
Troubleshooting Instructions RF
Measure Measure BAL
OUT_G_TX input to Z603
No No
Buffer input:
~ 1 dBm 0 dBm
Yes Yes
With Scope
Check Z603
check :
( TX SAW filter)
VTX_B_G =2.8 V
Yes
Check buffer
V702
NO
+
discretes around
NO
NO
Confidential
NPM-10
With Scope
check :
No
VTX= 2.8 V +
discretes around
Yes
Check TXIP and
TXQP
( See figure 19 )
Yes
Check
Base band
NO
NO
Check Mjoelner
+ the serial bus
Page 25
NO