Tuning Descriptions; St Batman Vhfpll - Nokia NPD-4 Series Technical Documentation Manual

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NPD-4

Troubleshooting — RF

CDMA RF CONN

GPS TCXO

GPS ENGINE CAN

GPS RF ASIC

SAW

FILTER

GPS

LNA

KEYPAD LED's

Tuning Descriptions

NOTE: Pass/Fail limits are not provided in this document as they may be changed.

This is one of the phone's self tests, which gives either a "pass" or "fail" result only. The

VHFPLL is inside the Batman IC. The phone checks the VHFPLL's lock detect bit. If this bit

indicates that the PLL is unlocked, the test will fail.

Manual Verification: Turn on the Cell or PCS receiver to any channel and probe at L701

(probing point 39 in Figure 6) using an RF probe connected to a spectrum analyzer tuned

to 256.2 MHz. If the PLL is locked, it will be stable in frequency. If it is unlocked, you may

have to use a wide span to see it since it may be far off frequency.

Page 8

Figure 2: Expedition (3585i) PWB top (general placement)

Nokia Corporation

CCS Technical Documentation

Confidential

PWB Spacer

GPS BB ASIC

VOLTAGE REGULATOR

LCD LED's

Issue 1 02/2003

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