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GSM Service Manual Page 1
Service Manual
Rev 1.2
(Hermes GPRS 900/1800)
20 Sep. 2004
NewGen Telecom Proprietary
GSM Service Manual Page 2
Revision History
Version Release Date Author Comments
1.0 Nov. 12, 2003 Steve Bae 1st Draft version
1.1 Jan. 07, 2004 Min Kim Added repair chart
1.2 Jan. 12, 2004 Art Kim Update more in detail for level 1&2 AS
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GSM Service Manual Page 3
Contents
1. INTRODUCTION ..................................................................................................................................5
2. PRODUCT DESCRIPTION..................................................................................................................5
2-1. FEATURES...........................................................................................................................................5
3. PRODUCT DESIGN ..............................................................................................................................7
4. SYSTEM BLOCK DIAGRAM .............................................................................................................8
5. SCHEMATIC..........................................................................................................................................8
6. DRAWING OF PART PLACEMENT OF PCBA (PEDRO) ...............................................................8
7. BOM ........................................................................................................................................................8
8. GENERAL DESCRIPTION OF EACH FUNCTIONAL BLOCK ....................................................9
8-1. ANT (7010004000)............................................................................................................................9
8-2. ANT SWITCH MODULE (U204) ..........................................................................................................9
8-3. SAW BPF (F200, F201).....................................................................................................................9
8-4. TRANSCEIVER IC (U206) ...................................................................................................................9
8-5. POWER AMPLIFIER (U203) .................................................................................................................9
8-6. DIRECTIONAL COUPLER (U202).......................................................................................................10
8-7. PAC(PA CONTROL) CIRCUIT ............................................................................................................10
8-8. SYNTHESIZER BLOCK .......................................................................................................................10
8-9. LOOP FILTERS (FOR UHF VCO AND FOR TWO TX VCOS)................................................................10
8-10. TX IF FILTER ................................................................................................................................. 11
8-11. ANALOG BASE BAND IC (U300)..................................................................................................... 11
8-12. POWER MANAGEMENT IC (U500).................................................................................................. 11
8-13. BASE BAND PROCESSOR (U401)..................................................................................................... 11
9. PERIPHERAL DEVICES ...................................................................................................................12
9-1. CAMERA INTERFACE ........................................................................................................................12
9-2. AUDIO INTERFACE ............................................................................................................................12
9-3. MICROPHONE INTERFACE .................................................................................................................12
9-4. VIBRATOR INTERFACE ......................................................................................................................12
9-5. SIM CARD INTERFACE .....................................................................................................................12
9-6. LCDS AND BACKLIGHTING CIRCUIT .................................................................................................13
9-7. BATTERY (LI-ION) ............................................................................................................................13
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GSM Service Manual Page 4
9-8. LED BACKLIGHT FOR KEYPAD AND LIGHT SENSOR ...........................................................................13
10. GENERAL TROUBLESHOOTING GUIDE...................................................................................14
10-1. ENTERING TEST MODE ....................................................................................................................14
10-2. LIST OF ITEMS IN CIT (CUSTOMER INTERFACE TEST) MENU ...........................................................14
10-3. SERVICE DIAGRAM .........................................................................................................................15
10-4. REPAIR GUIDE.................................................................................................................................20
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GSM Service Manual Page 5
1. Introduction
This document titled "Service Manual" describes the product features of G1 model and, how
to find the defects and to repair within service level 1 and 2 when the phone is not operating
properly as expected. When a customer brings mobile phone for servicing, take a look at the
phone in detail, and carefully listen to the customer's explanation of symptoms. Most of time,
water and humidity could be the reason for phone's failure. After cleaning the board, blow some
hot air onto the circuit. This cleaning and blowing of hot air solves 30% of the mobile phone
problems. Many of time, proper cleaning of connectors and sockets also solve the problem. As
the components used on the mobile phone circuit are very small, one should use a luminary-
magnifier to be able to properly view them.
2. Product Description
G1 is a dual band dual mode GSM phone, which supports both E-GSM and DCS1800 bands.
And this product has many other features, which will be explained briefly hereafter.
2-1. Features
2-1-1. General Features
. 260K TFT LCD for Main display (dots matrix: 128 x 160 dots)
. 4K CSTN for Sub display (dots matrix: 96 x 64)
. Dual back lighting for both LCDs
. 300K integrated CMOS camera with LED flash
. 7 color LED call coming indicator
. Support both Chinese and English character on display
. Quarter wavelength type Stubby ANT
. 64 level polyphonic sound for ring tone
. Built-in vibrator supporting the VibraCall feature
. WAP browser
. SIM Card (3V only)
. Li-ion battery (600 mAh for Slim / 780 mAh for Standard capacity)
. Mono Headset Jack
. RS232C data interface for PC sync
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GSM Service Manual Page 6
2-1-2. Performance Characteristics
Parameters Operating System Note
GSM 900 DCS 1800
Rx Sensitivity -107 dBm -106 dBm Typical
Tx Power Out 33dBm nominal 30 dBm nominal
Tx Frequency range 890.2~914.8MHz 1710.2~1784.8MHz
Rx Frequency range 935.2~959.8MHz 1805.2~1879.8MHz
Power Class 4 1
No. of RF channel 124 374
Duplex frequency offset 45MHz 95MHz
Duplex offset (time RX-TX) 3 timeslot 3 timeslot
Channel spacing 200KHz 200KHz
Modulation type 0.3GMSK 0.3GMSK
Modulator type I/Q I/Q
Frequency error <