Receiver Troubleshooting - Nokia 2255 Manual

Nokia Customer Care

Receiver Troubleshooting

Use Phoenix to perform the following steps for troubleshooting the receiver. Together
with the VCO frequency and level verification, this test should be the first test for a
non-working receiver. This test verifies the entire receiver chain, from input connector to
baseband output.
1. Inject a CW signal 881.82MHz or 881.22MHz (CH-384 offset by 300KHz) at a
fixed –75dBm power level, If you don't have Signal Generator, use the CALL BOX
in AMPS mode on Channel 374 or 394 (10 channels away from Channel 384).
2. Open the Phone Control dialog box.
Figure 18: Phone Control dialog box for Rx IF troubleshooting
3. Click the LOCAL button in the Phone State area to put the mobile terminal into
Local Mode.
4. Select the following values on the RF Main Mode dialog box:
Band = Cell (CDMA)
•
Channel = 384
•
Mode = Rx
•
ISSUE 1 10/2005
©2005 Nokia Corporation
RF Description and Troubleshooting
Company Confidential
2255 (RM-97)
Page 21