without the prior written permission of Nokia is prohibited.
Nokia, Nokia Connecting People, and Nokia X and Y are trademarks or registered trademarks of Nokia
Corporation. Other product and company names mentioned herein may be trademarks or tradenames of
their respective owners.
Nokia operates a policy of continuous development. Nokia reserves the right to make changes and
improvements to any of the products described in this document without prior notice.
Under no circumstances shall Nokia be responsible for any loss of data or income or any special, incidental,
consequential or indirect damages howsoever caused.
The contents of this document are provided "as is". Except as required by applicable law, no warranties of
any kind, either express or implied, including, but not limited to, the implied warranties of merchantability
and fitness for a particular purpose, are made in relation to the accuracy, reliability or contents of this
document. Nokia reserves the right to revise this document or withdraw it at any time without prior notice.
The availability of particular products may vary by region.
IMPORTANT
This document is intended for use by qualified service personnel only.
• IF THE DEVICE CAN BE INSTALLED IN A VEHICLE, CARE MUST BE TAKEN ON INSTALLATION IN VEHICLES FITTED
WITH ELECTRONIC ENGINE MANAGEMENT SYSTEMS AND ANTI-SKID BRAKING SYSTEMS. UNDER CERTAIN FAULT
CONDITIONS, EMITTED RF ENERGY CAN AFFECT THEIR OPERATION. IF NECESSARY, CONSULT THE VEHICLE DEALER/
MANUFACTURER TO DETERMINE THE IMMUNITY OF VEHICLE ELECTRONIC SYSTEMS TO RF ENERGY.
• THE PRODUCT MUST NOT BE OPERATED IN AREAS LIKELY TO CONTAIN POTENTIALLY EXPLOSIVE ATMOSPHERES,
FOR EXAMPLE, PETROL STATIONS (SERVICE STATIONS), BLASTING AREAS ETC.
• OPERATION OF ANY RADIO TRANSMITTING EQUIPMENT, INCLUDING CELLULAR TELEPHONES, MAY INTERFERE
WITH THE FUNCTIONALITY OF INADEQUATELY PROTECTED MEDICAL DEVICES. CONSULT A PHYSICIAN OR THE
MANUFACTURER OF THE MEDICAL DEVICE IF YOU HAVE ANY QUESTIONS. OTHER ELECTRONIC EQUIPMENT MAY
ALSO BE SUBJECT TO INTERFERENCE.
• BEFORE MAKING ANY TEST CONNECTIONS, MAKE SURE YOU HAVE SWITCHED OFF ALL EQUIPMENT.
Cautions
• Servicing and alignment must be undertaken by qualified personnel only.
• Ensure all work is carried out at an anti-static workstation and that an anti-static wrist strap is worn.
• Ensure solder, wire, or foreign matter does not enter the telephone as damage may result.
• Use only approved components as specified in the parts list.
• Ensure all components, modules, screws and insulators are correctly re-fitted after servicing and
alignment.
• Ensure all cables and wires are repositioned correctly.
• Never test a mobile phone WCDMA transmitter with full Tx power, if there is no possibility to perform the
measurements in a good performance RF-shielded room. Even low power WCDMA transmitters may disturb
nearby WCDMA networks and cause problems to 3G cellular phone communication in a wide area.
• During testing never activate the GSM or WCDMA transmitter without a proper antenna load, otherwise
GSM or WCDMA PA may be damaged.
Nokia requires that service points have sufficient ESD protection (against static electricity) when servicing
the phone.
Any product of which the covers are removed must be handled with ESD protection. The SIM card can be
replaced without ESD protection if the product is otherwise ready for use.
To replace the covers ESD protection must be applied.
All electronic parts of the product are susceptible to ESD. Resistors, too, can be damaged by static electricity
discharge.
All ESD sensitive parts must be packed in metallized protective bags during shipping and handling outside
any ESD Protected Area (EPA).
Every repair action involving opening the product or handling the product components must be done under
ESD protection.
ESD protected spare part packages MUST NOT be opened/closed out of an ESD Protected Area.
For more information and local requirements about ESD protection and ESD Protected Area, contact your local
This product is of superior design and craftsmanship and should be treated with care. The suggestions below
will help you to fulfil any warranty obligations and to enjoy this product for many years.
• Keep the phone and all its parts and accessories out of the reach of small children.
• Keep the phone dry. Precipitation, humidity and all types of liquids or moisture can contain minerals that
will corrode electronic circuits.
• Do not use or store the phone in dusty, dirty areas. Its moving parts can be damaged.
• Do not store the phone in hot areas. High temperatures can shorten the life of electronic devices, damage
batteries, and warp or melt certain plastics.
• Do not store the phone in cold areas. When it warms up (to its normal temperature), moisture can form
inside, which may damage electronic circuit boards.
• Do not drop, knock or shake the phone. Rough handling can break internal circuit boards.
• Do not use harsh chemicals, cleaning solvents, or strong detergents to clean the phone.
• Do not paint the phone. Paint can clog the moving parts and prevent proper operation.
• Use only the supplied or an approved replacement antenna. Unauthorised antennas, modifications or
attachments could damage the phone and may violate regulations governing radio devices.
All of the above suggestions apply equally to the product, battery, charger or any accessory.
Our policy is of continuous development; details of all technical modifications will be included with service
bulletins.
While every endeavour has been made to ensure the accuracy of this document, some errors may exist. If
any errors are found by the reader, NOKIA MOBILE PHONES Business Group should be notified in writing/email.
Please state:
• Title of the Document + Issue Number/Date of publication
• Latest Amendment Number (if applicable)
• Page(s) and/or Figure(s) in error
Please send to:
NOKIA CORPORATION
Nokia Mobile Phones Business Group
Nokia Customer Care
PO Box 86
FIN-24101 SALO
Finland
E-mail: Service.Manuals@nokia.com
Note: A new battery's full performance is achieved only after two or three complete charge and
discharge cycles!
The battery can be charged and discharged hundreds of times but it will eventually wear out. When the
operating time (talk-time and standby time) is noticeably shorter than normal, it is time to buy a new battery.
Use only batteries approved by the phone manufacturer and recharge the battery only with the chargers
approved by the manufacturer. Unplug the charger when not in use. Do not leave the battery connected to
a charger for longer than a week, since overcharging may shorten its lifetime. If left unused a fully charged
battery will discharge itself over time.
Temperature extremes can affect the ability of your battery to charge.
For good operation times with Ni-Cd/NiMh batteries, discharge the battery from time to time by leaving the
product switched on until it turns itself off (or by using the battery discharge facility of any approved accessory
available for the product). Do not attempt to discharge the battery by any other means.
Use the battery only for its intended purpose.
Never use any charger or battery which is damaged.
Do not short-circuit the battery. Accidental short-circuiting can occur when a metallic object (coin, clip or
pen) causes direct connection of the + and - terminals of the battery (metal strips on the battery) for example
when you carry a spare battery in your pocket or purse. Short-circuiting the terminals may damage the battery
or the connecting object.
Leaving the battery in hot or cold places, such as in a closed car in summer or winter conditions, will reduce
the capacity and lifetime of the battery. Always try to keep the battery between 15°C and 25°C (59°F and 77°
F). A phone with a hot or cold battery may temporarily not work, even when the battery is fully charged.
Batteries' performance is particularly limited in temperatures well below freezing.
Do not dispose of batteries in a fire!
Dispose of batteries according to local regulations (e.g. recycling). Do not dispose as household waste.
RA-6
Nokia E90 Communicator; L3&4 Service Manual
Structure
Nokia E90 Communicator; L3&4 Service Manual Structure
1 General Information
2 Service Tools and Service Concepts
3 BB Troubleshooting and Tuning Guide
4 RF troubleshooting
5 Camera Module Troubleshooting
6 System Module
Glossary
RA-6 product features and sales package............................................................................................................1–5
Product and module list ........................................................................................................................................1–7
Mobile enhancements............................................................................................................................................1–8
Transceiver general specifications ..................................................................................................................1–9
Main RF characteristics for GSM850/900/1800/1900 and WCDMA1900/2100 phones ...............................1–9
Table 3 Data ............................................................................................................................................................1–8
Figure 1 View of RA-6.............................................................................................................................................1–5
RA-6 is a WCDMA/GSM dual mode handportable phone supporting EGSM850/900/1800/1900 and WCDMA2100.
RA-6 is a 3GPP Release 5 terminal supporting WCDMA/HSDPA, EGPRS and GPRS data bearers. For WCDMA HSDPA
the maximum bit rate is up to 3.6 Mbps for downlink and 384 kbps for uplink with simultaneous CS speech
or CS video (max. 64 kbps).
For 2G and 2.5G networks the RA-6 is a Class A EGPRS DTM MSC 11 which means maximum download speed
of up to 236.8 kbps simultaneously with speech or Class B EGPRS MSC 32 which means a in maximum download
speed of up to 296kbit/s with EGPRS, and up to 107kbit/s with GPRS.
According to GSM standard 05.05 it responds to class 4 (max. 2W) in GSM 850 and EGSM 900 class 1 (1W) in
DCS 1800 and class 1 in PCS 1900. RA-6 supports EGPRS (EDGE) class B as well as Bluetooth 2.0 EDR standard.
RA-6 supports two way video calls with two integrated cameras, one on the front and one on the back.
RA-6 is an MMS (Multimedia Messaging Service) enabled multimedia computer with a large 2.6’’ QVGA (240
x 320 pixels) TFT colour display and an integrated 5 Megapixel auto focus camera. The MMS implementation
follows the OMA MMS standard release 1.2. The Browser is a highly advanced internet browser also capable
of viewing operator domain XHTML Mobile Profile (MP) content.
RA-6 uses Symbian 9.2 operating system and supports also MIDP Java 2.0 & CLDC1.1, providing a good platform
for compelling 3rd party applications.
Figure 1 View of RA-6
RA-6 product features and sales package
Communicator display and keypad
• Active matrix colour display (800 x 352), 16M colours
• 5-way rocker key, 2 soft keys beside screen, send and end keys
• Full keyboard with backlight (separate key to activate light), Application shortcut keys, Series60
application key, profile key
• Shortcuts to (chr+): Bluetooth, IR, help, volume control (call volume)
Cover display and ITU-T keypad
• Active matrix colour display (240 x 320), 16M colours •
• Full telephone keypad: Send and End keys, two separate Soft Keys, 5 way rocker, Power (including profile),
Application key, C key, Nib on the “5” key number keys. The Zero key has the wireless internet symbol
(long press activates web), silent profile activation in hash key
Hardware characteristics
• Communicator clamshell concept
• At least 128 MB free memory for user data and applications
• microSD (hot swap) memory card
• Integrated hands free speaker
• Internal Vibra
• Integrated GPS
• Integrated camera(s), 3Mpix with flash and autofocus, second camera QCIF for video calling
Connectivity
• Quad band GSM (850/900/1800/1900), WCDMA 2100
• GPRS/EGPRS (Class A, MSC 32)
• Dual mode transfer MSC11, SAIC rel v1
• HSDPA 3.6Mbit/s
• Mini USB type B interface with USB 2.0 full speed
• 3.5mm stereo headphone plug and TV out support (PAL/NTSC)
• Bluetooth wireless technology 2.0
• Infrared (SIR)
• IrDA
• 3GPP rel 5
Key features
UI and developer platform
• Series 60 Platform 3.1 Edition
• Symbian 9.2
• Java™ MIDP 2.0
Push email & PIM
• Intellisync Wireless Email
• Other emails :BlackBerry Connect, Mail for Exchange, Visto Mobile, Altexia
Front Camera ModuleCamera module CIF
Back Camera Module5MP camera with macro
Display Module
Engine Shield AssemblyPart of slide assembly
Slide AssemblyMechanical assembly
Core SW Module
Mobile enhancements
Table 1 Audio
EnhancementType
HeadsetsHS-47
HS-42
Wireless headsetsHS-25W
RA-6
Inductiove loopsetTBD
Table 2 Car
EnhancementType
Mobile Holder and antenna coupler
Mobile chargerDC-4
Nokia A/V adapter for legacy car kitsHF-6W
Car kitN616
Service tools............................................................................................................................................................2–5
Service concepts .................................................................................................................................................. 2–12
POS (Point of Sale) flash concept .................................................................................................................. 2–12
POS (Point of Sale) flash concept .................................................................................................................. 2–13
Module jig service concept............................................................................................................................ 2–14
Service concept for RF testing and RF/BB tuning........................................................................................ 2–15
Flash concept with FPS-10............................................................................................................................. 2–16
RF testing concept with RF coupler .............................................................................................................. 2–17
CU-4 flash concept with FPS-10..................................................................................................................... 2–18
The table below gives a short overview of service tools that can be used for testing, error analysis and repair
of product RA-6, refer to various concepts.
CA-31DUSB cable
The CA-31D USB cable is used to connect FPS-10 or FPS-11 to a PC. It is
included in the FPS-10 and FPS-11 sales packages.
CA-35SPower cable
CA-35S is a power cable for connecting, for example, the FPS-10 flash
prommer to the Point-Of-Sales (POS) flash adapter.
CU-4Control unit
CU-4 is a general service tool used with a module jig and/or a flash
adapter. It requires an external 12 V power supply.
The unit has the following features:
• software controlled via USB
• EM calibration function
• Forwards FBUS/Flashbus traffic to/from terminal
• Forwards USB traffic to/from terminal
• software controlled BSI values
• regulated VBATT voltage
• 2 x USB2.0 connector (Hub)
• FBUS and USB connections supported
When using CU-4, note the special order of connecting cables and
other service equipment:
Instructions
1 Connect a service tool (jig, flash adapter) to CU-4.
2 Connect CU-4 to your PC with a USB cable.
3 Connect supply voltage (12 V)
4 Connect an FBUS cable (if necessary).
5 Start Phoenix service software.
RA-6
Note: Phoenix enables CU-4 regulators via USB when it is
started.
Reconnecting the power supply requires a Phoenix restart.
FS-49Flash adapter
Flash adapter FS-49 is used for phone testing and flashing. FS-49 is
used with the generic flash adapter base SS-60/62 and control unit
CU-4 or interface adapter SS-46.
When flashing or system testing the phone, the adapter is attached to
replace the phone own battery.
All functions (as well as the calibration voltages, current and the
protections for over voltages, over current and voltage polarity), are
performed by CU-4.
Flash adapter FS-49 main features:
• VBATT supply interface
• USB / FBUS multiplexed interface to the phone
MJ-115Module jig
MJ-115 can be used for flashing as well as for RF, battery and system
testing.
MJ-115 main functions:
• CU-4 interface adapter to phone
• FBUS interface to phone
• UI Interface to phone
• WCDMA and GSM RF-interface
All functions are performed in CU-4 e.g. calibration voltages and
currents both all protections (over current, over voltage and voltage
polarity).
MJ-115 contains following interfaces to phone:
• VBATT interface
• UI interface containing Display connector
• WCDMA and GSM RF interfaces
• Bluetooth RF interface
• Earpiece interface
• IHF speaker interface
• Microphone interface
PCS-1Power cable
The PCS-1 power cable (DC) is used with a docking station, a module
jig or a control unit to supply a controlled voltage.
PKD-1SW security device
SW security device is a piece of hardware enabling the use of the
service software when connected to the parallel (LPT) port of the PC.
Without the device, it is not possible to use the service software.
Printer or any such device can be connected to the PC through the
device if needed.
RJ-150Soldering jig
RJ-150 is a soldering jig used for soldering and as a rework jig for the
engine module.
SA-125RF coupler
SA-125 is an RF coupler for WCDMA and GSM RF testing. It is used
together with the product-specific flash adapter.
SA-131RF coupler
SA-131 is a generic device for GPS testing.
SB-6Bluetooth tester
The SB-6 test box is a generic device to perform Bluetooth bit error
rate testing and doing cordless FBUS connection via Bluetooth.
Dead or jammed device troubleshooting............................................................................................................3–6
APE CPU troubleshooting.......................................................................................................................................3–7
APE memory troubleshooting...............................................................................................................................3–8
APE memorycard troubleshooting........................................................................................................................3–9
Flash programming 1 and 2............................................................................................................................... 3–10
Current measuring troubleshooting ................................................................................................................. 3–19
USB troubleshooting ........................................................................................................................................... 3–20
FM radio troubleshooting................................................................................................................................... 3–23
Hall sensor troubleshooting............................................................................................................................... 3–27
Certificate restoring for BB5 products............................................................................................................... 3–28
Power key troubleshooting................................................................................................................................ 3–33
Camera and PoC key troubleshooting ............................................................................................................... 3–35
ALS troubleshooting....................................................................................................................................... 3–42
Cover display and cover keyboard backlight troubleshooting.................................................................. 3–44
SMPS led driver troubleshooting .................................................................................................................. 3–48
Bluetooth troubleshooting................................................................................................................................. 3–49
Introduction to Bluetooth troubleshooting ................................................................................................ 3–49
Bluetooth settings for Phoenix..................................................................................................................... 3–49
Bluetooth self tests in Phoenix..................................................................................................................... 3–50
Bluetooth troubleshooting ........................................................................................................................... 3–52
Figure 10 BER test result..................................................................................................................................... 3–50
Figure 11 Bluetooth self tests in Phoenix......................................................................................................... 3–51
Figure 12 Single-ended output waveform of the Ext_in_HP_out measurement when earpiece is
This procedure is performed when the device certificate is corrupted for some reason.
All tunings (RF & Baseband, UI) must be done after performing the certificate restoring procedure.
The procedure for certificate restoring is the following:
• Flash the phone with the latest available software using FPS-8 or FPS-10.
Note: USB flashing does not work for a dead BB5 phone.
• Create a request file.
• Send the file to Nokia by e-mail. Use the following addresses depending on your location:
• APAC: sydney.service@nokia.com
• CHINA: repair.ams@nokia.com
• E&A: salo.repair@nokia.com
• AMERICAS: fls1.usa@nokia.com
• When you receive a reply from Nokia, carry out certificate restoring.
• Tune the phone completely.
Note: SX-4 smart card is needed.
• If the phone resets after certificate restoring, reflash the phone again.
Required equipment and setup:
•
Phoenix
• The latest phone model specific
• PKD-1 dongle
• SX-4 smart card (Enables BB5 testing and tuning features)
• External smart card reader
• Activated FPS-8 flash prommer OR FPS-10 flash prommer
• Flash update package 03.18.004 or newer for FPS-8 or FPS-10 flash prommers
• CU-4 control unit
• USB cable from PC USB Port to CU-4 control unit
• Phone model specific adapter for CU-4 control unit
• PCS-1 cable to power CU-4 from external power supply
• XCS-4 modular cable between flash prommer and CU-4
service software v 2004.39.7.70 or newer.
Phoenix
Note: The smart card reader is only needed when FPS-8 is used. FPS-10 has an integrated smart card
reader.
Note: CU-4 must be supplied with +12 V from an external power supply in all steps of certificate
restoring.
data package.
RA-6
Steps
1. Program the phone software.
iStart
iiUpdate the phone MCU software to the latest available version.
Page 3 –28COMPANY CONFIDENTIALIssue 1
Phoenix
If the new flash is empty and the phone cannot communicate with
and login. Make sure the connection has been managed correctly for FPS-8 or FPS-10.
Programming is completed when
The product type designator and MCU SW version are displayed in the status bar.
vi Close the
2. Create a
For this procedure, you must supply +12 V to CU-4 from an external power supply.
iTo connect the phone with
iiChoose Tools→Certificate Restore .
iii To choose a location for the request file, click Browse.
iv Name the file so that you can easily identify it, and click Open.
The name of the file and its location are shown.
vTo create the
vi When the file for certificate restore has been created, send it to Nokia as an e-mail attachment.
3. Restore certificate.
For this procedure, you must supply +12 V to CU-4 from an external power supply.
iSave the reply file sent by Nokia to your computer.
iiStart
iii Choose File→Scan Product .
• The display is in a normal mode when the phone is in active use.
• Display is in a partial idle mode when the phone is in the screen saver mode.
• The operating modes of the display can be controlled with the help of
Table 6 Display module troubleshooting cases
Display blankThere is no image on the display. The display looks
the same when the phone is on as it does when the
phone is off. The backlight can be on in some cases.
Image on the display not correctImage on the display can be corrupted or a part of
the image can be missing. If a part of the image is
missing, change the display module. If the image is
otherwise corrupted, follow the appropriate
troubleshooting diagram.
Phoenix
.
Backlight dim or not working at allBacklight LED components are inside the display
module. Backlight failure can also be in the
connector or in the backlight power source in the
main engine of the phone.
This means that in case the display is working
(image OK), the backlight is faulty.
Visual defects (pixel)Pixel defects can be checked by controlling the
display with Phoenix. Use both colours, black and
white, on a full screen.
The display may have some random pixel defects
that are acceptable for this type of display. The
criteria when pixel defects are regarded as a display
failure, resulting in a replacement of the display, are
presented the following table.
Table 7 Pixel defects
ItemWhite dot defectBlack dot
defect
1Defect countsRGBWhite Dot
Total
11
Total
1111
2Combined
defect counts
Issue 1COMPANY CONFIDENTIALPage 3 –37
Not allowed.
Two single dot defects that are within 5 mm of each other should be
1. Verify with a working display that the fault is not on the display module itself.
The display module cannot be repaired.
2. Check that the cellular engine is working normally.
iTo check the functionality, connect the phone to a docking station.
iiStart
iii Read the phone information to check that also the application engine is functioning normally (you
3. Proceed to the display troubleshooting flowcharts.
Use the Display Test tool in
• If a phototransistor is broken, replace it with a typical phototransistor.
• After replacing the phototransistor or if calibration values are lost for some other reason, ALS re-tuning is
required.
• Before starting the ALS calibration procedure, perform the 'Pull-up resistor calibration' in dark lighting
conditions, and write the measured 'correction' value to the phone. After this ALS calibration procedure
is performed, and the default co-efficient value '1' is written to the phone.
• Make sure that you have completed Display and keypad backlight troubleshooting first before
starting ALS troubleshooting.
Here are some hints for ALS troubleshooting; the following troubleshooting diagram refers to these:
•
Phoenix
office environment 100-2000 lx. The luminance value depends strongly on the light source and the angle
of the phone, so these values are only a rough guideline.
• LED driver control voltage measurement points can be found from the LED driver troubleshooting
section. When backlight brightness is set to 100%, both GENOUT signals are low, and enable PWM is 100%.
•
Phoenix
calibration is done first. See the following procedure.
LED control tool also shows you luminance. The correct luminance in darkness is <20 lx, and in
has an ambient light sensor calibration tool for changing calibration values. The pull-up resistor
Steps
1. Cover the light guide (upper part of the A-Cover).
There are two main Bluetooth problems that can occur:
ProblemDescription
Detachment of the BT antenna.This would most likely happen if the device has
been dropped repeatedly to the ground. It could
cause the BT antenna to become loose or partially
detached from the PWB. (see next page for details
about BT antenna HW and Mechanics)
A malfunction in the BT ASIC, BB ASICs or Phone’s BT
SMD components.
The main issue is to find out if the problem is related to the BT antenna or related to the BT system or the
phone’s BB and then replace/fix the faulty component.
This is unpredictable and could have many causes
i.e. SW or HW related.
Bluetooth settings for Phoenix
Steps
1. Start
2. From the File menu, choose Open Product, and then choose the correct type designator from the
3. Place the phone to a flash adapter in the local mode.
4. Choose Testing→Bluetooth LOCALS .
5. Locate JBT-9’s serial number (12 digits) found in the type label on the back of JBT-9.
6. In the
7. Place the JBT-9 box near (within 10 cm) the BT antenna and click Run BER Test.
Phoenix
Product list.
In addition to JBT-9, also SB-6, JBT-3 and JBT-6 Bluetooth test boxes can be used.
Bluetooth LOCALS
Counterpart BT Device Address line.
This needs to be done only once provided that JBT-9 is not changed.
When measuring with a single-ended probe each output is measured against the ground.
Internal handsfree output is measured using a current probe, if a special low-pass filter designed for
measuring a digital amplifier is not available. Note also that when using a current probe, the input signal
frequency must be set to 2 kHz.
The input signal for each loop test can be either single-ended or differential.
Required equipment
The following equipment is needed for the tests:
• Oscilloscope
• Function generator (sine waveform)
• 'Active speaker' or 'speaker and power amplifier'
• Sound level meter
• Current probe (Internal handsfree DPMA output measurement)
• Phoenix service software
• Battery voltage 3.7 V
Test procedure
Audio can be tested using the Phoenix audio routings option. Three different audio loop paths can be
activated:
• External microphone to Internal earpiece
• External microphone to Internal handsfree speaker
• Internal microphone to External earpiece
Each audio loop sets routing from the specified input to the specified output enabling a quick in-out test.
Loop path gains are fixed and they cannot be changed using Phoenix. Correct pins and signals for each test
are presented in the following table.
Phoenix audio loop tests and test results
The results presented in the table apply when no accessory is connected and battery voltage is set to 3.7 V.
Earpiece, internal microphone and speaker are in place during measurement. Applying a headset accessory
during measurement causes a significant drop in measured quantities.
The gain values presented in the table apply for a differential output vs. single-ended/differential input.
Figure 12 Single-ended output waveform of the Ext_in_HP_out measurement when earpiece is connected.
If a special low-pass filter designed for measuring digital amplifiers is unavailable, the measurement must be performed with a
current probe and the input signal frequency must be 2kHz.
Figure 13 Differential output waveform of the Ext_in_IHF_out out loop measurement when speaker is connected.