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Service of the Telephone EN/LZB 119 2506 R1A
Chapter 5
Service of the Telephone
Ericsson Cellular Phone AF738
AF778
i
EN/LZB 119 2506 R1A Service of the Telephone
SUBJECT .................................................................................... PAGE
Introduction.........................................................................................................5-1
Repair Flow .........................................................................................................5-2
Figure 5-1. Repair Flow.....................................................................................5-2
Table 5-1. Repair Actions ..................................................................................5-3
AF738 Internal Components ...............................................................................5-4
Figure 5-2. AF738 Internal Components ............................................................5-5
AF778 Internal Components ...............................................................................5-6
Figure 5-3. AF778 Internal Components ............................................................5-7
Common Telephone Failures ..............................................................................5-8
Table 5-2. Common Failures..............................................................................5-8
Required Tools ..................................................................................................5-11
AF738 Disassembly............................................................................................5-12
Main Disassembly ...........................................................................................5-12
AF778 Disassembly............................................................................................5-13
Main Disassembly ...........................................................................................5-13
Replacing The LCD/Lightguide Assembly.......................................................5-15
Figure 5-4. Removing Lightguide Assembly ....................................................5-15
Figure 5-5. Board Revision Level ....................................................................5-16
Figure 5-6. Replacing Lightguide Assembly ....................................................5-17
Replacing the Vibrator Motor Assembly (AF778 Only) ...................................5-18
Replacing the Vibrator Motor ..........................................................................5-18
Figure 5-7. Vibrator Motor Assembly ..............................................................5-19
Replacing the Vibrator Connector....................................................................5-19
Replacing the Vibrator Wires...........................................................................5-20
Replacing the Keypad......................................................................................5-20
Replacing the System Connector......................................................................5-20
Reassembly ........................................................................................................5-21
AF738 Reassembly..........................................................................................5-21
AF778 Reassembly..........................................................................................5-22
Torquing Instructions.......................................................................................5-24
Figure 5-8. Torquing Sequence ........................................................................5-24
Return to Service Checkout ..............................................................................5-24
ii
Service of the Telephone EN/LZB 119 2506 R1A
iii
Service of the Telephone EN/LZB 119 2506 R1A
Introduction
This chapter contains Level 3 repair procedures for the Ericsson AF738 and AF778
cellular telephones. Please follow the checkout procedures before returning the unit
to Ericsson Product Repair Center.
5-1
EN/LZB 119 2506 R1A Service of the Telephone
Repair Flow
See Figure 5-1 and Table 5-1 for Level 3 repair flow and actions.
From Customer
Visual Fail
Inspection
OK
Go/No Go Fail
Test
OK
Fail
On-The-Air Call
OK
Warranty Seal
Repair Fail
To Customer
OK
Warranty Seal
To higher level
of service
Figure 5-1. Repair Flow
5-2
Service of the Telephone EN/LZB 119 2506 R1A
Table 5-1. Repair Actions
Action Description
Visual Inspection Performed to identify mechanical faults on the phone.
Check for mechanical damages and dust in the
display.
Go/No Go Test Used to measure radio parameters according to
DAMPS specifications.
On-the-Air Call Made to a stationary telephone using a handsfree kit
to verify system connector functionality.
On-the-Air Call/HF Made to a stationary telephone using a handsfree kit
to check system connector functionality if there is
suspicion that HF doesn't work.
Repair Carried out on replaceable components. After repair
the phone is tested from inspection again
Warranty Seal Placed over the left torx screw at the bottom.
5-3
EN/LZB 119 2506 R1A Service of the Telephone
AF738 Internal Components
The following are the internal components of theAF738 cellular phone. See
Figure 5-2.
1. Flip
2. Side Volume Keys
3. Front Cover
4. Loudspeaker
5. LCD Display Assembly
6. Buzzer
7. Buzzer Gasket
8. Antenna Connector
9. Antenna
10. Back Cover
11. Battery Connector
12. Antenna Channel
13. System Connector
14. Microphone
15. PCB
16. Keypad
17. Microphone Duct
18. Hinge Inset
Please contact your Regional Service Manager for the latest spare parts list with part
numbers and pricing.
NOTE
The spare parts lists distributed by the Regional Service
Managers are more detailed than the information in this
manual. Please reference the item name and the phone model
when requesting spare parts information.
5-4
Service of the Telephone EN/LZB 119 2506 R1A
2
1
3
18
4
17
16
5
6
7
15
8
14
13
9
12
10
11
Figure 5-2. AF738 Internal Components
5-5
EN/LZB 119 2506 R1A Service of the Telephone
AF778 Internal Components
The following are the internal components of theAF778 cellular phone. See
Figure 5-3.
1. Flip
2. Side Volume Keys
3. Front Cover
4. Loudspeaker
5. LCD Display Assembly
6. Vibrator Connector
7. Buzzer
8. Buzzer Gasket
9. Antenna Connector
10. Vibrator Boot
11. Vibrator Motor
12. Antenna
13. Antenna Straw
14. Back Cover
15. Battery Connector
16. System Connector
17. Microphone
18. PCB
19. Keypad
20. Microphone Duct
21. Hinge Insets
22. Battery Connector
23. Antenna Channel
Please contact your Regional Service Manager for the latest spare parts list with part
numbers and pricing.
NOTE
The spare parts lists distributed by the Regional Service
Managers are more detailed than the information in this
manual. Please reference the item name and the phone model
when requesting spare parts information.
5-6
Service of the Telephone EN/LZB 119 2506 R1A
2
1
3
21
4
20
19
5
6
7
18 8
9
17
16
12
10
11
15
14
13
Figure 5-3. AF778 Internal Components
5-7
EN/LZB 119 2506 R1A Service of the Telephone
Common Telephone Failures
Refer to Table 5-2 for a list of common failures, the probable cause of the failure, and
the component to be changed.
Many failures or problems with the phone may be software-related. The first thing
that should always be checked is software version of the phone. Please ensure that
the phone has the latest version of software (contact your Regional Service Manager
for further information).
Table 5-2. Common Failures
Possible
Symptom Failure Action
1. Phone not Damaged antenna Change antenna
getting signal Damaged antenna Change back cover
connector
Preferred system option Make sure option is set to
incorrectly set PREF SYS or PREF ONLY
Mask SID enabled (MENU 52)
Check Mask SID entries. Refer
to Chapter 4, Programming
MASK SIDs.
Damaged antenna Replace antenna
Damaged antenna Replace antenna connector
connector (Level 2 and higher only)
2. Top Indicator No RF signal Ensure you are in an area with
not lit some signal.
See items in #1s See items in #1
3. Phone number SUBNUMBER option is Make sure you have entered a
displays 1s and not programmed Mobile number in both the MIN
0s even after and SUBNUMBER fields. The
programming SUBNUMBER is what actually
gets displayed.
4. Top LED is Is it really red or is it If it is really orange, the VIB
always red even orange? ONLY feature is enabled (AF-
though battery is 778 only...MENU 16)
charged.
5-8
Service of the Telephone EN/LZB 119 2506 R1A
Table 5-2. Common Failures
Possible
Symptom Failure Action
5. I set the RING 2 options for RING VOL, The audio options allow for a
VOL to high, but TONE, etc. setting one option in handset
it sometimes mode and a different one in
gets set to low. handsfree mode.
6. Portuguese Certain packages only The Portuguese option is only
option is not available in certain packaged
available in my phones in certain markets.
phone
7. Display not lit Display Change display assembly
8. Display Display broken Change display assembly
segments
missing
9. Display locks up Shorted LCD connections Replace LCD assembly
10. Power levels are RF test adapter Make sure you are using the
low proper RF test adapter with the
phone.
AF-778 RF adapter requires a
shorter gold pin (only 2mm).
Refer to Chapter 4, Figure 4-1.
11. Side Volume Bad soldering Resolder switches
Keys not Bad switch positioning Desolder and reposition
functioning switches
Broken switches Exchange switches
12. Keypad keys not Bad or broken keypad Exchange keypad
functioning
13. Buzzer not Bad solder at buzzer Check and resolder
functioning
Broken buzzer Exchange buzzer
14. Vibrator not Broken vibrator motor Change vibrator motor
functioning*
Broken vibrator connector Change vibrator connector
Damaged wires from Change damaged wires
vibrator connector to
vibrator motor
Damaged boot assembly Check and replace boot
assembly
5-9
EN/LZB 119 2506 R1A Service of the Telephone
Table 5-2. Common Failures
Possible
Symptom Failure Action
15. Audio not Sound channel at flip may Clean or exchange flip*
functioning be clogged*
Contacts at system
connector may be broken Check and exchange system
Microphone broken connector
Earphone broken
Change microphone
Change front cover
16. Phone won't ON key may be damaged Check/exchange keypad
turn on System connector may be
damaged Check/exchange system
connector
17. Battery not Battery or system Check and exchange battery
charging connector may be
damaged
Peripherals not System connector may be Check and clean all contacts at
functioning damaged: system connector and contact
pads on PCB
Check/exchange system
connector
* On AF778 only
5-10
Service of the Telephone EN/LZB 119 2506 R1A
Required Tools
The following are the tools needed to perform Level 3 service on the Ericsson AF738
and AF778 cellular telephones: