Transmitter Troubleshooting Setup; Amps Tx Setup - Nokia 3155 Rf Description And Troubleshooting

Nokia Customer Care

Transmitter Troubleshooting Setup

Use the following sets of procedures to troubleshoot the transmitter using Phoenix. Due
to the compact layout of the mobile terminal, some of the major test points are not
accessible without destroying the shield frames and the EL lamp. For example, duplexers/
diplexer/couplers test points are blocked by the test jig, the PA test points are
underneath the shield frame, and the BBIQ points are underneath the EL lamp.
To minimize effort, check the following in order:
1. Tx power at the RF connector.
2. All Tx DC points.
3. All soldering jig points for the whole Tx chain.
4. UHF LO presence:
• If the UHF LO is present, check the N7000 output.
• If the UHF LO is not present, it is a synthesizer problem.
5. If there is no N7000 output:
a. Change the N7000.
b. If the problem persists, reflow the duplexers, diplexer, and couplers.
c. If the problem persists, change the PA.
6. If there are several failed mobile terminals with the same symptoms, it may be
necessary to break one to determine the cause.
Use the following sections to set up troubleshooting in Phoenix according to the band
you are using:
• "AMPS Tx
• "Cell Tx
• "PCS Setup" on page

AMPS Tx Setup

Use the following procedures to prepare for AMPS Tx troubleshooting using Phoenix.
1. Connect the RF test connector to a spectrum analyzer.
2. Connect the mobile terminal to the PC via a test jig. (The bottom connector is a
USB port.)
3. Connect a power supply to the mobile terminal.
4. Open the Troubleshooting menu, and click Phone Control.
The Phone Control dialog box appears.
ISSUE 1 07/2005
Setup" on page 13
Setup" on page 16
18
©2005 Nokia Corporation
3155/3155i (RM-41), 3152 (RM-61)
RF Description and Troubleshooting
Company Confidential Page 13