General Instructions For Rx Troubleshooting - Nokia RM-237 Service Manual

RM-237
RF Troubleshooting and Manual Tuning Guide
In GSM, the input signal can be either a real GSM signal or a CW signal that is 67.771kHz up from the carrier
frequency.
For service tool usage instructions, refer to section Service Tools and Service Concepts.

General instructions for RX troubleshooting

Steps
1. Connect a test jig to a computer with a DAU-9S cable or to a FPS-10 flash prommer with a modular cable
(XCS-4).
Make sure that you have a PKD-1 dongle connected to the computer's parallel port.
2. Connect CU-4 with 12 V supply. The DC supply voltage is set to 3.7 V by default (in Phoenix).
3. Connect an RF cable between the RF connector of the module test jig (MJ-122) and measurement
equipment or alternatively use a 50 Ω (at least 2 W) dummy load in the module test jig RF connector,
otherwise the RF part may be damaged.
Note: Make sure that all connections are made to the correct RF connector.
4. Set Rx on.
i Set the phone module to the test jig and start
ii Initialize connection to the phone. (With the FPS-10 prommer use FPS10_USB or FPS10_TCP drivers,
depending on connection type. When using DAU-9S select FBUS).
iii From the File menu, choose product: File -> Choose Product -> xx-x* (* = type designator of the
phone, eg. RM-237), or press Ctrl + R to scan product.
iv From the toolbar, set operating mode to "Local".
5. EGSM900/1800/1900 troubleshooting
i From the Testing menu, activate the
RF Controls window:
ii In the
• Select band.
• Set Active unit to "Rx" (Default ).
• Set Operation mode to "Burst" (Default).
• Set Rx/Tx channel (see table below).
• Apply a frequency (see table below) to the RF-connector.
Note: Remember to compensate for cable attenuation, specific for MJ-122. You will find the values
in the Service tools section.
Apply a signal to the RF-connector (remember to compensate for cable attenuation). See values in
the table below.
Issue 1
RF Controls window: Testing -> GSM -> RF Controls .
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