LG LG600G User manual

Service Manual Model : LG600G
Service Manual
LG600G
Date: May, 2008 / Issue 1.0
Internal Use Only

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1. INTRODUCTION ...............................5
1.1 Purpose .................................................. 5
1.2 Regulatory Information............................ 5
1.3 Abbreviations .......................................... 7
2. PERFORMANCE...............................9
2.1 H/W Features...........................................9
2.2 Technical Specification ..........................10
3. TECHNICAL BRIEF ........................15
3.1 SKY77517 TX-RX iPAC™ FEM for
Dual-Band GSM/GPRS (U501)..............15
3.2 Transceiver (AD6548, U502) .................17
3.3 26 MHz Clock (Crystal, X500)................19
3.4 Baseband Processor (AD6724, U104)...20
3.5 Display and Interface .............................27
3.6 Camera Interface(AIT701G, U402)........29
3.7 Keypad Switches and Scanning ............31
3.8 Microphone ............................................32
3.9 Main Speaker.........................................33
3.10 Headset Interface.................................34
3.11 Key Back-light Illumination...................35
3.12 LCD Back-light Illumination..................36
3.13 VIBRATOR...........................................37
4. TROUBLE SHOOTING ...................38
4.1 RF Component.......................................38
4.2 RX Trouble.............................................39
4.3 TX Trouble .............................................43
4.4 Power On Trouble..................................46
4.5 Charging Trouble ...................................48
4.6 Vibrator Trouble .....................................50
4.7 LCD Trouble...........................................52
4.8 Camera Trouble .....................................55
4.9 Speaker Trouble ....................................58
4.10 SIM Card Interface Trouble..................60
4.11 Earphone (Headset mic) Trouble.........62
4.12 KEY backlight Trouble .........................64
4.13 Receiver Trouble..................................66
4.14 Microphone Trouble .............................68
4.15 RTC Trouble ........................................70
4.16 Folder on/off Trouble............................71
5. DOWNLOAD.......................................72
5.1 Download ...............................................72
6. BLOCK DIAGRAM ..........................78
7. CIRCUIT DIAGRAM ........................79
8. BGA IC Pin Check ..........................85
9. PCB LAYOUT..................................89
10. ENGINEERING MODE ..................95
10.1 BB Test [MENU 1]................................96
10.2 RF Test [MENU 2]................................97
10.3 MF mode [MENU 3] .............................98
10.4 Trace option [MENU 4] ........................99
10.5 Call timer [MENU 5] .............................99
10.6 Fact. Reset [MENU 6] ..........................99
10.7 S/W version..........................................99
11. STAND ALONE TEST .................100
11.1 Introduction ........................................100
11.2 Setting Method...................................100
11.3 Means of Test ....................................101
12. AUTO CALIBRATION .................103
12.1 Overview ............................................103
12.2 Equipment List ...................................103
12.3 Test Jig Operation..............................104
12.4 Procedure ..........................................105
12.5 AGC ...................................................107
12.6 APC....................................................107
12.7 ADC ...................................................107
13. EXPLODED VIEW &
REPLACEMENT PART LIST ..... 109
13.1 Exploded View .................................. 109
13.2 Replacement Parts ............................111
13.3 Accessory ......................................... 124
Table Of Contents
LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes

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LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes

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1. INTRODUCTION
1.1 Purpose
This manual provides the information necessary to repair, calibration, description and download the
features of this model.
1.2 Regulatory Information
A. Security
Toll fraud, the unauthorized use of telecommunications system by an unauthorized part (for example,
persons other than your company’s employees, agents, subcontractors, or person working on your
company’s behalf) can result in substantial additional charges for your telecommunications services.
System users are responsible for the security of own system. There are may be risks of toll fraud
associated with your telecommunications system. System users are responsible for programming and
configuring the equipment to prevent unauthorized use. The manufacturer does not warrant that this
product is immune from the above case but will prevent unauthorized use of common-carrier
telecommunication service of facilities accessed through or connected to it.
The manufacturer will not be responsible for any charges that result from such unauthorized use.
B. Incidence of Harm
If a telephone company determines that the equipment provided to customer is faulty and possibly
causing harm or interruption in service to the telephone network, it should disconnect telephone
service until repair can be done. A telephone company may temporarily disconnect service as long as
repair is not done.
C. Changes in Service
A local telephone company may make changes in its communications facilities or procedure. If these
changes could reasonably be expected to affect the use of the this phone or compatibility with the
network, the telephone company is required to give advanced written notice to the user, allowing the
user to take appropriate steps to maintain telephone service.
D. Maintenance Limitations
Maintenance limitations on this model must be performed only by the manufacturer or its authorized
agent.
The user may not make any changes and/or repairs expect as specifically noted in this manual.
Therefore, note that unauthorized alternations or repair may affect the regulatory status of the system
and may void any remaining warranty.
1. INTRODUCTION
LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes

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1. INTRODUCTION
E. Notice of Radiated Emissions
This model complies with rules regarding radiation and radio frequency emission as defined by local
regulatory agencies. In accordance with these agencies, you may be required to provide information
such as the following to the end user.
F. Pictures
The pictures in this manual are for illustrative purposes only; your actual hardware may look slightly
different.
G. Interference and Attenuation
Phone may interfere with sensitive laboratory equipment, medical equipment, etc.Interference from
unsuppressed engines or electric motors may cause problems.
H. Electrostatic Sensitive Devices
ATTENTION
Boards, which contain Electrostatic Sensitive Device (ESD), are indicated by the sign.
Following information is ESD handling:
• Service personnel should ground themselves by using a wrist strap when exchange system boards.
• When repairs are made to a system board, they should spread the floor with anti-static matb which is
also grounded.
• Use a suitable, grounded soldering iron.
• Keep sensitive parts in these protective packages until these are used.
• When returning system boards or parts like EEPROM to the factory, use the protective package as
described.
LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes

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1. INTRODUCTION
1.3 Abbreviations
For the purposes of this manual, following abbreviations apply:
LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes
APC Automatic Power Control
BB Baseband
BER Bit Error Ratio
CC-CV Constant Current - Constant Voltage
DAC Digital to Analog Converter
DCS Digital Communication System
dBm dB relative to 1 milli watt
DSP Digital Signal Processing
EEPROM Electrical Erasable Programmable Read-Only Memory
ESD Electrostatic Discharge
FPCB Flexible Printed Circuit Board
GMSK Gaussian Minimum Shift Keying
GPIB General Purpose Interface Bus
GSM Global System for Mobile Communications
IPUI International Portable User Identity
IF Intermediate Frequency
LCD Liquid Crystal Display
LDO Low Drop Output
LED Light Emitting Diode
OPLL Offset Phase Locked Loop

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1. INTRODUCTION
LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes
PAM Power Amplifier Module
PCB Printed Circuit Board
PGA Programmable Gain Amplifier
PLL Phase Locked Loop
PSTN Public Switched Telephone Network
RF Radio Frequency
RLR Receiving Loudness Rating
RMS Root Mean Square
RTC Real Time Clock
SAW Surface Acoustic Wave
SIM Subscriber Identity Module
SLR Sending Loudness Rating
SRAM Static Random Access Memory
PSRAM Pseudo SRAM
STMR Side Tone Masking Rating
TA Travel Adapter
TDD Time Division Duplex
TDMA Time Division Multiple Access
UART Universal Asynchronous Receiver/Transmitter
VCO Voltage Controlled Oscillator
VCTCXO Voltage Control Temperature Compensated Crystal Oscillator
WAP Wireless Application Protocol

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2. PERFORMANCE
2.1 H/W Features
2. PERFORMANCE
LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes
Item Feature Comment
Standard Battery Li-ion, 3.7V 800mAh
Talk time Up to 200min : GSM Tx Level 7
Stand by time Up to 200 hours (Paging Period: 5, RSSI: -85 dBm)
Charging time Approx. 2.5 hours
RX Sensitivity GSM, EGSM: -102dBm, DCS: -102dBm, PCS: -102dBm
TX output power GSM, EGSM: 32.5dBm(Level 5),
DCS , PCS: 29.5dBm(Level 0)
GPRS compatibility Class 10
SIM card type 3V,1.8V Small
Display MAIN : TFT 128 ×160 pixel 65K Color
SUB : MONO STN 96 × 64
Hard icons. Key Pad
Status Indicator 0 ~ 9, #, *, Up/Down/Left/Right/Ok Navigation Key
Menu Key, Clear Key, Back Key, Confirm Key
Send Key, Volume Key, PWR Key, Camera Key, Hot Key
ANT Internal
EAR Phone Jack Yes (mono)
PC Synchronization Yes
Speech coding EFR/FR/HR
Data and Fax Yes
Vibrator Yes
Loud Speaker No
Voice Recoding Yes
Microphone Yes
Speaker/Receiver One way speaker
Travel Adapter Yes
MIDI SW MIDI (Mono SPK)
Camera VGA
Bluetooth Yes

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2. PERFORMANCE
2.2 Technical Specification
LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes
Item Description Specification
GSM850
TX: 824 + n x 0.2 MHz
1Frequency Band RX: 935 + n x 0.2 MHz (n=1~124)
PCS
TX: 1850 + (n-512) x 0.2 MHz
RX: 1930+ (n-1512) x 0.2 MHz (n=512~810)
2Phase Error RMS < 5 degrees
Peak < 20 degrees
3Frequency Error < 0.1 ppm
GSM850
Level Power Toler. Level Power Toler.
533 dBm 2dB 13 17 dBm 3dB
631 dBm 3dB 14 15 dBm 3dB
729 dBm 3dB 15 13 dBm 3dB
827 dBm 3dB 16 11 dBm 5dB
925 dBm 3dB 17 9 dBm 5dB
10 23 dBm 3dB 18 7 dBm 5dB
11 21 dBm 3dB 19 5 dBm 5dB
12 19 dBm 3dB
4Power Level PCS
Level Power Toler. Level Power Toler.
030 dBm 2dB 8 14 dBm 3dB
128 dBm 3dB 9 12 dBm 4dB
226 dBm 3dB 10 10 dBm 4dB
324 dBm 3dB 11 8 dBm 4dB
422 dBm 3dB 12 6 dBm 4dB
520 dBm 3dB 13 4 dBm 4dB
618 dBm 3dB 14 2 dBm 5dB
716 dBm 3dB 15 0 dBm 5dB

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2. PERFORMANCE
LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes
Item Description Specification
GSM850
Offset from Carrier (kHz). Max. [dBc]
100 0.5
200 -30
250 -33
400 -60
600 ~ 1,200 -60
1,200 ~ 1,800 -60
1,800 ~ 3,000 -63
3,000 ~ 6,000 -65
5Output RF Spectrum 6,000 -71
(due to modulation) DCS/PCS
Offset from Carrier (kHz). Max. [dBc]
100 0.5
200 -30
250 -33
400 -60
600 ~ 1,200 -60
1,200 ~ 1,800 -60
1,800 ~ 3,000 -65
3,000 ~ 6,000 -65
6,000 -73
GSM850, EGSM
Offset from Carrier (kHz) Max. [dBm]
Output RF Spectrum 400 -19
6(due to switching transient) 600 -21
1,200 -21
1,800 -24

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2. PERFORMANCE
LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes
Item Description Specification
DCS/PCS
Offset from Carrier (kHz) Max. [dBm]
Output RF Spectrum 400 -22
6(due to switching transient) 600 -24
1,200 -24
1,800 -27
7Spurious Emissions Conduction, Emission Status
GSM850
8Bit Error Ratio BER (Class II) < 2.439% @-102 dBm
PCS
BER (Class II) < 2.439% @-102 dBm
9RX Level Report Accuracy
10 SLR 8 3 dB
Frequency (Hz) Max.(dB) Min.(dB)
100 -12 -
200 0 -
300 0 -12
11 Sending Response 1,000 0 -6
2,000 4 -6
3,000 4 -6
3,400 4 -9
4,000 0 -
12 RLR 2 3 dB
Frequency (Hz) Max.(dB) Min.(dB)
100 -12 -
200 0 -
300 2 -7
500 * -5
13 Receiving Response 1,000 0 -5
3,000 2 -5
3,400 2 -10
4,000 2
*Mean that Adopt a straight line in between 300 Hz
and 1,000 Hz to be Max. level in the range.

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2. PERFORMANCE
LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes
Item Description Specification
14 STMR 13 5 dB
15 Stability Margin > 6 dB
dB to ARL (dB) Level Ratio (dB)
-35 17.5
-30 22.5
16 Distortion -20 30.7
-10 33.3
033.7
731.7
10 25.5
17 Side Tone Distortion Three stage distortion < 10%
18 System frequency ≤2.5ppm
(13 MHz) tolerance
19 32.768KHz tolerance ≤ 30 ppm
At least 65 dBspl under below conditions:
20 Ringer Volume 1. Ringer set as ringer.
2. Test distance set as 50 cm
21 Charge Current Fast Charge : < 600 mA
Slow Charge : < 120 mA
Bar Number Power
5-85 dBm ~
4-90 dBm ~ -86 dBm
22 Antenna Display 3 -95 dBm ~ -91 dBm
2-100 dBm ~ -96 dBm
1-105 dBm ~ -101 dBm
0~-105 dBm
Battery Bar Number Voltage
03.56V 0.05 V
23 Battery Indicator 1 3.66V 0.05 V
23.74V 0.05 V
33.85V 0.05 V
43.86V 0.05 V ~

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2. PERFORMANCE
LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes
Item Description Specification
24 Low Voltage Warning 3.56 0.05 V (Call) every 1 minutes
3.50 0.05 V (Standby)
25 Forced shut down Voltage 3.35 0.05V
Li-Ion Battery
26 Battery Type Standard Voltage = 3.7 V
Battery full charge voltage = 4.2 V
Capacity: 830mAh
Switching-mode charger
27 Travel Charger Input: 100 ~ 240 V, 50/60 Hz
Output: 5.2 V, 800 mA

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3. TECHNICAL BRIEF
3.1 SKY77517 TX-RX iPAC™ FEM for Dual-Band GSM/GPRS (U501)
Description
The SKY77517 is a Transmit and receive front-end-module (FEM) with Integrated Power Amplifier
Control (iPAC™) for dual-band cellular handsets comprising GSM850 and PCS1900 operation.
Designed in a low profile, compact form factor, the SKY77517 offers a complete Transmit VCO-to-
Antenna and Antenna-to-Receive SAW filter solution. The FEM also supports class 12 General Packet
Radio Service (GPRS) multi-slot operation.
The module consists of a GSM850 PA block and a PCS1900 PA block, impedance-matching circuitry
for 50 Ω input and output impedances, TX harmonics filtering, high linearity and low insertion loss
PHEMT RF switches, diplexer and a Power Amplifier Control (PAC) block with internal current sense
resistor. A custom BiCMOS integrated circuit provides the internal PAC function and decoder circuitry
to control the RF switches. The two Heterojunction Bipolar Transistor (HBT) PA blocks are fabricated
onto a single Gallium Arsenide (GaAs) die. One PA block supports the GSM850 band and the other
PA block supports the PCS1900 band. Both PA blocks share common power supply pads to distribute
current. The output of each PA block and the outputs to the two receiver pads are connected to the
antenna pad through PHEMT RF switches and a diplexer. The GaAs die, PHEMT die, Silicon (Si) die
and passive components are mounted on a multi-layer laminate substrate. The assembly is
encapsulated with plastic overmold.
Band selection and control of transmit and receive modes are performed using two external control
pads. Refer to the functional block diagram in Figure 3.1.1 below. The band select pad (BS) selects
between GSM and PCS modes of operation. The transmit enable (TX_EN) pad controls receive or.
transmit mode of the respective RF switch (TX = logic 1). Proper timing between transmit enable
(TX_EN) and Analog Power Control (VRAMP) allows for high isolation between the antenna and
TX_VCO while the VCO is being tuned prior to the transmit burst.
The SKY77517 is compatible with logic levels from 1.2V to VCC for BS and TX_EN pads, depending
on the level applied to the VLOGIC pad. This feature provids additional flexibility for the designer in the
selection of FEM interface control logic.
3. TECHNICAL BRIEF
LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes
Figure 3.1.1 Functional Block Diagram

LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes
3. TECHNICAL BRIEF
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Table 3.1.3 Pad description
Table 3.1.4 SKY77517 Mode Control logic
Figure 3.1.2 SKY77517 FEM Package Pad configuration -20-Pad Leadless (Top view)
and Typical case marking
Pin Mame Description
1VCATT Battery input voltage
2VLOGIC Control logic level selection/Standby control
3VRAMP Analog power control voltage input
4TX_EN TX/RX select (mode control)
5BSBand Select (mode control)
6PCS_RX PCS Receive RF Output (1930-1990 MHz)
7GSM_RX GSM Receive RF Output (869-894 MHz)
8-1 GND RF and DC Ground
11 ANT RF_IN/RF_OUT to Antenna
12-16 GND RF and DC Ground
17 GSM_IN RF input 824-849 MHz
18 NC No Connect
19 PCS_IN RF input 1850-1910 MHz
20 GND RF and DC Ground
GND PADS GROUND GRID Ground Pads, module underside
Mode VLOGIC
Input Control Bits
TX_En BS
STANDBY 0 X1 X1
GSM_RX 1 0 0
PCS_RX 1 0 1
GSM_TX 1 1 0
PCS_TX 1 1 1

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3. TECHNICAL BRIEF
3.2 Transceiver (AD6548, U502)
The AD6548 provides a highly integrated direct conversion radio solution that combines, on a single chip, all radio
and power management functions necessary to build the most com-pact GSM radio solution possible. The only
external components required for a complete radio design are the Rx SAWs, PA, Switchplexer and a few passives
enabling an extremely small cost effective GSM Radio solution. The AD6548 uses the industry proven direct
conversion receiver architecture of the OthelloTM family. For Quad band applications the front end features four
fully integrated programmable gain differential LNAs. The RF is then down converted by quad-rature mixers and
then fed to the baseband programmable-gain amplifiers and active filters for channel selection. The Receiver
output pins can be directly connected to the baseband analog processor. The Receive path features automatic
calibration and tracking to remove DC offsets. The transmitter features a translation-loop architecture for directly
modulating baseband signals onto the integrated TX VCO.
The translation-loop modulator and TX VCO are extremely low noise removing the need for external SAW filters
prior to the PA. The AD6548 uses a single integrated LO VCO for both the receive and the transmit circuits. The
synthesizer lock times are optimized for GPRS applications up to and including class 12.
AD6548 incorporates a complete reference crystal calibration system. This allows the external VCTCXO to be
replaced with a low cost crystal. No other external components are required. The AD6548 uses the traditional
VCTCXO reference source. The AD6548 also contains on-chip low dropout voltage regulators (LDOs) to deliver
regulated supply voltages to the functions on chip, with a battery input voltage of between 2.9V and 5.5V.
Comprehensive power down options are included to minimize power consumption in normal use. A standard 3
wire serial interface is used to program the IC. The interface features low-voltage digital interface buffers
compatible with logic levels from 1.6V to 2.9V.
LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes
Figure 3.2.1 AD6548 Block Diagram

LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes
Notes:
1. Supply regulated by internal LDO3 and should not be connected to any other supply
2. Internally connected as Synth supply (Counters + SDM + Charge pump)
3. Supply regulated by internal LDO2 and should not be connected to any other supply
3. TECHNICAL BRIEF
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Table 3.2.2 AD6548/9 Pin Descriptions
No Name Description No Name Description
1VCC_FE Front end supply (IP) 17 VCC_REF Reference Oscillator Supply (IP)
2I I baseband input/output 18 VAFC/ AD6548 Crystal Freq control (IP)
N/C AD6549: Spare Pin
3IBIbaseband input/output 19 REFIN Crystal Connection
4VCC_BBI Baseband I, TX path supply (IP) 20 REFINB Crystal Connection
5SDATA Serial port data 21 REF_OP Reference Frequency Output
6SCLK Serial port clock 22 QB Q baseband input/output
7SEN Serial port enable 23 Q Q baseband input/output
8N/C Not connected 24 VCC_BBQ Baseband Q supply (IP)
9VLDO3 TX LDO Output (1) 25 RX1900B PCS 1900 LNA input
10 TXOP_LO Transmit O/P (850/900MHz) 26 RX1900 PCS 1900 LNA input
11 TXOP_HI Transmit O/P (1800/1900MHz) 27 RX1800B DCS 1800 LNA input
12 VCC_TXVCO TX VCO supply (1) 28 RX1800 DCS 1800 LNA input
13 VDD Serial interface supply 29 RX900B E-GSM LNA input
14 VBAT Battery I/P for LDO reg’s 30 RX900 E-GSM LNA input
15 VLDO1 LDO regulator Output (2) 31 RX850B GSM 850 LNA input
16 VLDO2 LO VCO Supply (3) 32 RX850 GSM 850 LNA input
GOMPLIANT TO JEDEC STANDARDS MO-220-VHHD-2

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3. TECHNICAL BRIEF
3.3 26 MHz Clock (Crystal, X500)
The 26 MHz clock (X500) consists of a XO( Crystal Oscillator) which oscillates at a frequency of 26 MHz. The
AD6548 requires only an external low cost crystal as the frequency reference. The circuitry to oscillate the crystal
and tune its frequency is fully integrated. The Oscillator is a balanced implementation requiring the crystal to be
connected across 2 pins. There is a programmable capacitor array included for coarse tuning of fixed offsets (e.g.
crystal manufacturing tolerance), and an integrated varactor for dynamic control. The oscillator is designed for use
with a 26MHz crystal. Dedicated control software ensures excellent frequency stability under all circumstances.
LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes
Figure 3.3 CRYSTAL CIRCUIT DIAGRAM
12
34
TSX-3225_26MHZ
X500
26MHz

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3. TECHNICAL BRIEF
3.4 Baseband Processor (AD6724, U104)
• AD6724 is an ADI designed processor
• AD6724 consists of
1. Control Processor Subsystem including:
32-bit MCU ARM7TDMI® Control Processor
39 MHz operation at 1.8V
1Mb of on-chip System SRAM Memory
2. DSP Subsystem including:
16-bit Fixed Point DSP Processor
91 MIPS[1] at 1.8V
Data and Program SRAM
Program Instruction Cache
Full Rate, Enhanced Full Rate and Half Rate
Speech Encoding/Decoding
Capable of Supporting AMR & PDC Speech Algorithms
3. Peripheral Functions
Parallel and Serial Display Interface
Keypad Interface
Flash Memory Interface
Page-Mode Flash Support
1.8V and 3.0V, 64 kbps SIM Interface
Universal System Connector Interface
Data Services Interface
Battery Interface (e.g. Dallas)
4. Other
Supports 13 MHz and 26 MHz Input Clocks
1.8V Typical Core Operating Voltages
264-Ball Package (17x17mm) , 0.65mm Ball pitch
5. The AD6724 baseband transmit section supports the following
mobile station GMSK modulation power classes:
GSM 900/850 power classes 4 and 5,
DCS 1800 power classes 1 and 2, and
PCS 1900 power classes 1 and 2
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3. TECHNICAL BRIEF
LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes
Figure 3.4 SYSTEM INTERCONECTION OF AD6720 EXTERNAL INTERFACE