Service Manuals, User Guides, Schematic Diagrams or docs for : . Rare and Ancient Equipment Ericsson Mobile Phones ERICSSON AF738, AF778 AECH2
<< Back | HomeMost service manuals and schematics are PDF files, so You will need Adobre Acrobat Reader to view : Acrobat Download Some of the files are DjVu format. Readers and resources available here : DjVu Resources
For the compressed files, most common are zip and rar. Please, extract files with Your favorite compression software ( WinZip, WinRAR ... ) before viewing. If a document has multiple parts, You should download all, before extracting.
Good luck. Repair on Your own risk. Make sure You know what You are doing.
Image preview - the first page of the document
>> Download AECH2 documenatation <<
Text preview - extract from the document
Technical Description EN/LZB 119 2506 R1A
Chapter 2
Technical Description
Ericsson Cellular Phone AF738
AF778
i
EN/LZB 119 2506 R1A Technical Description
SUBJECT .................................................................................... PAGE
General ................................................................................................................... 2-1
Mechanical ........................................................................................................2-2
Table 2-1. Phone Dimensions ............................................................................2-2
Keypad..............................................................................................................2-3
Figure 2-1.Keypad .............................................................................................2-3
Side Volume Keys .............................................................................................2-4
Figure 2-2. Side Volume Keys ...........................................................................2-4
LCD ..................................................................................................................2-4
Figure 2-3. LCD Display ...................................................................................2-4
Table 2-2. LCD Display Areas...........................................................................2-4
Top Indicator.....................................................................................................2-5
Table 2-3. Top Indicator Functions ....................................................................2-5
Vibrator Motor (AF778 Only)............................................................................2-6
Retractable Antenna ..........................................................................................2-6
1/4 Wave Antenna Operation .........................................................................2-6
Figure 2-4. AF778 1/4 Wave Antenna Connections............................................2-7
1/2 Wave Antenna Operation (AF778) ...........................................................2-7
Figure 2-5.1/2 Wave Antenna Connections ........................................................2-8
Transceiver PCB and Component Layout............................................................. 2-9
Major Components................................................................................................2-10
Figure 2-6. PCB Component Layout ................................................................2-10
Table 2-4. Component Table............................................................................2-11
Figure 2-7. Block Diagram ..............................................................................2-13
Radio Section .........................................................................................................2-15
General............................................................................................................2-15
Table 2-5. Frequencies.....................................................................................2-15
Duplexer..........................................................................................................2-16
Receiver ..........................................................................................................2-16
Receive Front End .......................................................................................2-17
IF Section ....................................................................................................2-17
Synthesizer ......................................................................................................2-18
VCTCXO ....................................................................................................2-18
BERTINDY.................................................................................................2-19
RX (Main) Synthesizer ................................................................................2-19
TX (Auxiliary) Synthesizer ..........................................................................2-20
MALIN .......................................................................................................2-20
Transmitter......................................................................................................2-20
Power Amplifier ..........................................................................................2-20
ii
Technical Description EN/LZB 119 2506 R1A
SUBJECT......................................................................................................... PAGE
Logic Section ......................................................................................................... 2-21
Processor/Control Interface ............................................................................. 2-21
GUSTAV.................................................................................................... 2-22
6303 Microprocessor................................................................................... 2-22
ROM .......................................................................................................... 2-22
RAM .......................................................................................................... 2-22
Bus Interface............................................................................................... 2-22
Decoder ...................................................................................................... 2-22
Serial Interface............................................................................................ 2-22
External Ports ............................................................................................. 2-22
Watchdog On/Off........................................................................................ 2-23
Beep, Alarm, Ring (BAR) ........................................................................... 2-23
Clock Generator.......................................................................................... 2-23
Silent Ring (AF778 Only) ........................................................................... 2-23
Internal Ports .............................................................................................. 2-23
Modem ....................................................................................................... 2-24
Baudclock................................................................................................... 2-24
Memories........................................................................................................ 2-24
RAM .......................................................................................................... 2-24
ROM .......................................................................................................... 2-24
EPROM (Flash) .......................................................................................... 2-25
EEPROM.................................................................................................... 2-25
User Interface ................................................................................................. 2-26
LCD ........................................................................................................... 2-26
Keyboard .................................................................................................... 2-26
Buzzer ........................................................................................................ 2-26
Illumination ................................................................................................ 2-27
Vibrator Motor (AF778 Only) ..................................................................... 2-27
Audio (Baseband) Section............................................................................... 2-27
Receive Audio ............................................................................................ 2-27
Transmit Audio ........................................................................................... 2-27
Power Supplies ............................................................................................... 2-28
Regulators................................................................................................... 2-28
Reset........................................................................................................... 2-28
On/Off Control............................................................................................ 2-28
Transient/ESD Protection............................................................................ 2-29
Charging Circuit ............................................................................................. 2-29
Rapid Charging ........................................................................................... 2-30
Figure 2-8. Rapid Charging............................................................................. 2-30
Trickle Charging ......................................................................................... 2-30
Connections On The Transceiver Board.............................................................. 2-31
Antenna Connector ......................................................................................... 2-31
iii
EN/LZB 119 2506 R1A Technical Description
SUBJECT..........................................................................................................PAGE
Battery Contacts ..............................................................................................2-31
Speaker Connector...........................................................................................2-31
LCD Contacts..................................................................................................2-31
Microphone Connector ....................................................................................2-31
Vibrator Connector (AF778 Only) ...................................................................2-31
Antenna Ground Strap (AF778 Only)...............................................................2-31
System Connector............................................................................................2-32
Figure 2-9. System Connector..........................................................................2-32
Table 2-6. System Connector Signals...............................................................2-32
Specifications .........................................................................................................2-33
iv
Technical Description EN/LZB 119 2506 R1A
General
The Ericsson AF738 and AF778 cellular telephones are small, lightweight phones
operating at 4.8v, powered by a 4-cell Nickel Metal Hydride (NiMH) battery. They
are class III cellular telephones for use with the AMPS cellular network.
Features of the phone include:
◦ Jabse Service Manual Search 2026 ◦ Jabse Pravopis ◦ onTap.bg ◦ Other service manual resources online : Fixya ◦ eServiceinfo