Nokia 8390 Manuales De Servicio

NSB-8

Troubleshooting Instructions

PAMS Technical Documentation

Page 78

 

ãNokia Corporation

Issue 1 01/02

All RF tunings should be performed in MJS-46 Jig. When using Test Jig MJS-46, the ref-
erence level attenuation is 0.1 dB + cable loss.

The reference level attenuation for Docking Station JBV-1 + MJF-6 adapter with antenna 
coupler CPL-6 is approximately 4 dB +cable loss.There can be minor differences between 
CPL-6 antenna couplers, but maximum distribution is +-0.3dBm. Attenuation can varie 
between antenna couplers. There is differences in attenuations between low and high 
channel, but those can be ignored.

When Docking Station with MJF-6 and CPL-6 inside the shield box JSX-1 is used, then 
calibration procedure is following:

• Measure one known phone in 

MJS-46 Module Jig in Ch 661, the output power 

(P1) should be 29.5dBm +- 0.2dB. Remember the jig loss 0.1dB and cable loss.

• Assemble the measured phone in to mechanics

• Put the phone in to the JBV-1 Docking Station, without 

JXS-1 Shield Box 

• Measure the output power 

(P2) in Ch 661

• The attenuation 

(A1) of the antenna coupler is: A1=(P1+0.5dBm)-P2

• (

Note! Mechanics will increase output power 0.5dB)

Typical coupler (CPL-6) attenuation is 4.0dB. If measurements are done without 

Shield Box, the same value can be used in TX and RX.

If using shielded box 

JSX-1, additional loss is needed separately for LO, MID and HI 

Channels. Typical loss values are: LO= 5.7dB, MID=2.3dB and HI=0.5dB 

When checking the phone’s functionality in the JBV-1 docking station with a coupler, 
the TX power may vary to some degree. TX power levels 14 and 15 should be ignored, as 
the coupler’s response is not reliable. The following table lists the TX output power toler-
ances, when CPL-6 is used for measuring: