Rf Unit - Huawei U8860 Maintenance Manual

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U8860

Maintenance Manual

9.3 RF Unit

The power supplies of the RF unit are as follows:

Signal

VREG_S2_1V35_A1

VREG_S4_2V2

VREG_S3_1V8

VBAT

VREG_L14_2P85

VCC2

Troubleshooting process:

Failure: The phone cannot initiate a call or be called.

Solution:

Maintenance procedure for transmission failure in W2100, W900, GSM900, and GSM1800

Maintenance procedure for transmission failure in W2100:

Firstly, ensure that the SIM card and antenna are installed properly, and then detect the phone

according to the following procedure.

Issue 1.0 (2011-11-14)

Voltage

1.3 V

2.2 V

1.8 V

3.7 V

2.85 V

3.4 V

Huawei Proprietary and Confidential

9 Principles and Troubleshooting

Description

Supplies power for QTR8615

Supplies 3.7 V voltage for WiFi and BT

Single pole, 10 throw power switch

PA VCC2

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