Nokia 2220 Servicehandbuch
RH-42
System Module
CCS Technical Documentation
Page 24
Nokia Corporation Confidential
Issue 2 09/2003
System Connector Lines
Battery Connector Lines
BSI and BTEMP lines are protected by spark gaps and the RC circuit (4k7 and 10n), in
which the resistors are size 0603.
which the resistors are size 0603.
MBUS and FBUS
The opening in the protective metal deck, underneath the battery, is so small that ESD
does not get into the MBUS and FBUS lines in the production test pattern.
does not get into the MBUS and FBUS lines in the production test pattern.
Transceiver Interfaces
The tables in the following sections illustrate the signals between the various transceiver
blocks.
blocks.
BB - RF Interface Connections
The BB and RF parts are connected together without a physical connector.
All the signal descriptions and properties in the following tables are valid only for active
signals, and the signals are not necessarily present all the time.
signals, and the signals are not necessarily present all the time.
Note: In the following tables, the nominal signal level of 2.78V is sometimes referred to as 2.7V.
System Connector signals that have EMC protection
Protection type
VIN
XMIXP
XMICN
XEARP
XEARN
HEADINT
MICP
ferrite bead (600
/199MHz)
/199MHz)
X
X
X
X
X
ferrite bead (420
/100MHz)
/100MHz)
X
spark gaps
X
X
X
X
X
X
PWB capacitors
X
X
X
X
X
X
RC-circuit
X
X
X
X
X
capacitor to
ground
ground
X
X
X
X
X