Motorola CDMA 800/1900 MHz service manual Level 1 and 2 Troubleshooting Chart

Page 40

Troubleshooting

Q CDMA

Troubleshooting

Table 2. Level 1 and 2 Troubleshooting Chart

Symptom

Probable Cause

Verification and Remedy

 

 

 

 

 

 

Measure battery voltage across a 50 ohm (>1

 

a) Battery either discharged or

Watt) load. If the battery voltage is <3.25 Vdc,

1. Telephone will not turn on or stay on.

recharge the battery using the appropriate battery

defective.

 

charger. If the battery will not recharge, replace the

 

 

 

 

battery. If battery is not at fault, proceed to b.

 

 

 

 

 

Visually inspect the battery connectors on both the

 

 

battery and the telephone. Realign and, if

 

b) Battery connectors open or

necessary, either replace the battery or refer to a

 

misaligned.

Level 3 Service Center for the battery connector

 

 

replacement. If battery connectors are not at fault,

 

 

proceed to c.

 

 

 

 

 

Remove the transceiver board. Substitute a known

 

 

good transceiver board and temporarily

 

 

reassemble the unit. Press the PWR button; if unit

 

c) Transceiver board defective.

turns on and stays on, disconnect the dc power

 

source and reassemble the telephone with the

 

 

 

 

new transceiver board. Verify that the fault has

 

 

been cleared. If the fault has not been cleared then

 

 

proceed to d.

 

 

 

 

 

Replace the keyboard assembly. Temporarily

 

 

connect a +3.6 Vdc supply to the battery

 

d) keyboard assembly failure.

connectors. Depress the PWR button. If unit turns

 

 

on and stays on, disconnect the dc power source

 

 

and reassemble with the new keyboard assembly.

 

 

 

 

 

Check to make sure that the antenna pin is

2. Telephone exhibits poor reception or

 

properly connected to the transceiver board

erratic operation such as calls frequently

a) Antenna assembly defective.

assembly. If connected properly, substitute a

dropping or weak or distorted audio.

 

known good antenna. If the fault is still present,

 

 

proceed to b.

 

 

 

 

 

Replace the transceiver board (refer to 1c). Verify

 

b) Transceiver board defective.

that the fault has been cleared and reassemble the

 

 

unit with the new transceiver board.

 

 

 

 

 

Check general condition of flex and flex connector.

 

 

If the flex and connector are good, check that the

3. Display is erratic, or provides partial or

a) Connections to or from

flex connector is fully connected. If not, check

no display.

transceiver board defective.

connector to transceiver board connections. If

 

 

faulty connector, replace the transceiver board. If

 

 

connector is not at fault, proceed to b.

 

 

 

 

b) Transceiver board assembly

Replace the transceiver board (refer to 1c). Verify

 

that the fault has been cleared and reassemble the

 

defective.

 

unit with the new transceiver board.

 

 

 

 

 

4. Incoming call alert transducer audio

 

Replace the transceiver board (refer to 1c). Verify

Faulty transceiver board assembly.

that the fault has been cleared and reassemble the

distorted or volume is too low.

 

unit with the new transceiver board.

 

 

 

 

 

5. Telephone transmit audio is weak.

a) microphone obstructed by user

Verify transmit audio quality. If transmit audio

(usually indicated by called parties

while holding the phone

quality is still weak and microphone is not

complaining of difficulty in hearing voice).

 

obstructed, proceed to b.

 

 

 

 

b) keyboard assembly defective

Replace the keyboard assembly with a know good

 

 

keyboard assembly. Verify that the fault is cleared

 

 

and reassemble the unit with the new keyboard

 

 

assembly. If this does not clear the fault, reinstall

 

 

the original keyboard assembly and proceed to c

 

 

 

 

40

May 15, 2006

6809495A97-O

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Contents Digital Wireless Telephone Page Contents Introduction Product IdentificationProduct Names Regulatory Agency ComplianceAudience Computer Program CopyrightsScope Warranty Service Policy ConventionsOut-of-Box Failure Policy Product SupportParts Replacement Accessories and Aftermarket Division AADSpecifications General Function SpecificationFeatures Product OverviewPersonal Information Management QcelpControls, Indicators, and Input/Output I/O Connectors General OperationMenu Navigation Undo/Back KeyStatus Icons Home Screen DisplayActive Roam Line5. Signal Strength Battery Charge Indicator Battery FunctionBattery Removal Operation Tools and Test Equipment General Test Equipment and ToolsDisassembly Removing the Battery Door Battery door latchRemoving and Replacing the Battery BatteryRemoving and Replacing the Rear Housing Housing screw locationsRear housing Disassembly tool Removing the Rear Housing LatchesRemoving the Motor/Vibrator Assembly Removing the Motor/Vibrator AssemblyAntenna carrier Access slot Snap Removing and Replacing the AntennaDisassembly tool Daughter board Removing the Daughter BoardRemoving the Camera Assembly Camera connectorRear housing Speaker carrier Latch Disassembly tool Removing and Replacing the Speaker CarrierDisassembly tool Flex connector Removing and Replacing the Main BoardMain board Keyboard Disassembly tool Removing the Main Board and KeyboardRemoving and Replacing the Keyboard Main board Grounding gasket KeyboardKeyboard Main board Disassembly tool Keyboard Disassembly tool Main board060793o Aligning the Keyboard Adhesive Tape 6809495A97-O May 15 Keyboard Assembly Fixture Apply Main Board to Key Board conductive gasket as shown Removing the Display Assembly Display catchDisplay Flex Display assembly Front housing Removing the Display AssemblyRemoving and Replacing the Keypad Keypad latches Alignment HolePersonality Transfer Phone IdentificationIdentification Troubleshooting Level 1 and 2 Troubleshooting ChartProgramming Software Upgrade and Flexing Exploded View Diagram Exploded View May 15 6809495A97-OExploded View Parts List Exploded View Parts ListAccessories Accessories6809497A97-O May 15 Index-1 Index

CDMA 800/1900 MHz specifications

Motorola has long been recognized as a key player in the telecommunications industry, especially with its contributions to mobile communications technology. Among its impressive portfolio, the Motorola CDMA 800/1900 MHz stands out as a significant offering, particularly in the realm of Code Division Multiple Access (CDMA) technologies. This article delves into the main features, technologies, and characteristics of this versatile mobile communication standard.

The CDMA 800/1900 MHz spectrum refers to the frequency bands used for CDMA network deployment, specifically at 800 MHz and 1900 MHz. These frequencies allow carriers to provide robust mobile coverage, enhanced network capacity, and better call quality. The dual-band capability offers a versatile solution for both urban and rural environments, as 800 MHz is known for its ability to penetrate buildings and cover larger areas, while 1900 MHz is effective in densely populated regions.

One of the standout features of Motorola's CDMA technology is its ability to accommodate multiple users on the same frequency channel. This is achieved through code-based separation, where unique codes are assigned to each user. This allows many calls to occur simultaneously without interference, enhancing network efficiency and user experience. Additionally, CDMA technology provides significant improvements in voice quality and clarity, thanks to its advanced error correction algorithms.

Another notable aspect of the Motorola CDMA 800/1900 MHz is its support for various technologies that enhance functionality. The integration of features such as 1xRTT, EV-DO, and later evolutions introduced functionalities like packet data services and faster download speeds. EV-DO (Evolution Data Optimized) significantly boosts data transmission rates, making it ideal for mobile broadband services and applications, such as video streaming and online gaming.

Security is a critical concern in telecommunications, and Motorola's CDMA technology offers robust security measures. The encryption algorithms used in CDMA help protect user data and maintain privacy during voice calls and messaging, ensuring a secure communication environment.

In summary, Motorola CDMA 800/1900 MHz epitomizes reliable and efficient mobile communication. Its dual-band functionality provides expansive coverage and enhances user experience through simultaneous voice and data services. Advanced technologies such as EV-DO and robust security measures further contribute to its appeal. As the telecommunications landscape continues to evolve, the legacy of Motorola's CDMA technology remains a significant part of mobile communication history.
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