Tuning Descriptions; St Batman Vhfpll - Nokia NPD-1 Series Troubleshooting - Rf

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NPD-1

Troubleshooting — RF

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.

Troubleshooting: First check that V701 has the proper orientation, then check C701,

C714, R703, R702, C715, R704, C716, L701, and C702. Also check power supplies to Bat-

man, particularly check for 2.7v on VR5 at C710, and on VR7 at C708, and check for 1.8v

on VIO. If no fault is found, replace N701 (Batman).

Page 8

Figure 2: Eagle PWB top (general placement)

Nokia Corporation

CCS Technical Documentation

Confidential

Issue 1 11/2002

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