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Motorola A835 Service Manual
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Motorola A835 Service Manual

Motorola A835 Service Manual

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Level 1 and 2 Service Manual
A835
Wireless Telephone
A835
GSM 900/1800/1900 and WCDMA 2100 MHz
Motorola Confidential Proprietary

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Summary of Contents for Motorola A835

  • Page 1 Level 1 and 2 Service Manual A835 Wireless Telephone A835 GSM 900/1800/1900 and WCDMA 2100 MHz Motorola Confidential Proprietary...

  • Page 3: Table Of Contents

    Product Overview ................10 A835 Companion Devices: Video Camera and Location Solutions ......10 General Operation .
  • Page 4 Contents A835 October 30, 2003 6809464A28 Motorola Confidential Proprietary...

  • Page 5: Introduction

    Available on a contract basis, Motorola Inc. offers comprehensive maintenance and installation programs which enable customers to meet requirements for reliable, continuous communications. To learn more about the wide range of Motorola service programs, contact your local Motorola products representative or the nearest Customer Service Manager. Product Identification Motorola products are identified by the model number on the housing.

  • Page 6: About This Service Manual

    Customer Service Manager. Audience This document aids service personnel in testing and repairing A835 telephones. Service personnel should be familiar with electronic assembly, testing, and troubleshooting methods, and with the operation and use of associated test equipment.

  • Page 7: Warranty Service Policy

    When ordering replacement parts or equipment, include the Motorola part number and description used in the service manual or supplement. When the Motorola part number of a component is not known, use the product model number or other related major assembly along with a description of the related major assembly and of the component in question.

  • Page 8: Specifications

    Specifications A835 Specifications Table 1. Specifications General Function Specification Frequency Range EGSM TX: 876 - 915 MHz Frequency (MHz) = 890 + (0.2 × n) where: 0 ≤ n ≤ 124 Frequency (MHz) = 890 + (0.2 × (n – 1024)) where: 955 ≤ n ≤ 1023 RX: 921 –...
  • Page 9 Level 1 and 2 Service Manual Specifications Table 2. GSM System General Function Specification Speech Coding Type Regular Pulse excitation / linear predictive coding with long term prediction (RPE LPC with LTP) Bit Rate 13.0 kbps RF Power Output 32 dBm nominal GSM, 30 dBm nominal DCS / PCS Receive Sensitivity -107 dBm GSM, -105 dBm DCS / PCS RX Bit Error Rate...

  • Page 10: Product Overview

    A835 Product Overview The A835 is a 3G device. It will deliver on the “promise” of 3G by providing high speed network access and rich multimedia content all in a superior voice-centric unit. Two companion devices, a video camera and a combination video camera with Assisted GPS provide additional value by offering unique business and entertainment solutions.
  • Page 11 Level 1 and 2 Service Manual Product Overview you’re on the phone • Future Capabilities: • Video Conferencing (2-Way Video Telephony) Location (AGPS) Applications: • Get to specific location, with appropriate choices of destinations and routes and guidance to destination •...

  • Page 12: General Operation

    General Operation A835 General Operation Controls, Indicators, and Input/Output (I/O) Connectors The A835 telephone’s Camera controls are located on the front of the phone, and on the keyboard as shown. Indicators, in the form of Earpiece Menu Key icons, are displayed on the...
  • Page 13 Level 1 and 2 Service Manual General Operation ➊ Signal Strength Indicator Shows the strength of the phone’s connection with the network. Strong No signal You cannot make or answer calls when the “no signal” indicator is displayed. ➋ Service Indicator Shows when a GPRS connection is available. Your service provider may indicate that a GPRS packet data connection is active.

  • Page 14: User Interface Menu Structure

    General Operation A835 User Interface Menu Structure Menu Navigation A835 telephones are equipped with a simplified icon and list-based user interface. Main Menu Settings Note: This is the standard phone menu layout. You • Media Center • Personalize • Other Settings or your service provider •...

  • Page 15: Alert Settings

    General Operation Alert Settings ® Motorola A835 phones incorporate the VibraCall discreet vibrating alert that helps avoid disturbing others when a ringing phone is unacceptable. Alerts can be set to ring only, vibrate only, vibrate then ring, or no ring or vibrate.
  • Page 16 General Operation A835 October 30, 2003 6809464A28...

  • Page 17: Tools And Test Equipment

    Digital Multimeter Used to measure battery voltage 1. To order in North America, contact Motorola Aftermarket and Accessories Division (AAD) by phone (800) 422-4210 or fax (800) 622-6210; Internationally, you can reach AAD by phone (847) 538-8023 or fax (847) 576-3023.

  • Page 18: Disassembly

    Disassembly A835 Disassembly This section describes how to disassemble a A835 telephone. Refer to Table 4 for a list of tools and equipment used. Many of the integrated devices used in this phone are vulnerable to damage from electrostatic discharge (ESD). Ensure you use adequate static protection when handling, shipping, and servicing the internal components.
  • Page 19 Level 1 and 2 Service Manual Disassembly We recommend that you store batteries in their protective cases when not in use. To remove the battery Ensure the phone is turned off. If the battery door is installed, remove it by pushing down the battery door release latch and lifting the door off the phone.

  • Page 20: Removing And Replacing The Rear Housing

    Disassembly A835 Removing and Replacing the Rear Housing To remove the rear housing (Motorola model) Follow the procedures in this section to remove the: • Battery door • Battery Using the Torx driver and T-6 bit, remove the 2 screws shown in Figure 3. Set the screws aside for reuse.
  • Page 21 Level 1 and 2 Service Manual Disassembly To remove the rear housing (Siemens model) Follow the procedures in this section to remove the: • Battery door • Battery Torx driver and T-6 bit, remove the 4 screws as shown in Figure 4. Set the screws aside for reuse.
  • Page 22 Disassembly A835 Carefully lift the rear housing off of the phone. Rear Housing Rear Housing Latch Rear Housing Rear Housing Latch Latch Disassembly Tool Rear Housing Latches Figure 5. Rear Housing Removal (Siemens model) To replace the rear housing Align the rear housing with the phone (front housing).

  • Page 23: Removing And Replacing The Endo Assembly

    Level 1 and 2 Service Manual Disassembly Removing and Replacing the Endo assembly This phone contains static-sensitive devices. Use anti-static handling procedures to prevent electrostatic discharge (ESD) and component damage. To remove the Endo assembly Ensure the phone is off. Follow the procedures to remove the •...
  • Page 24 Disassembly A835 Carefully slide the front housing toward the antenna to release the bottom corner tab at the bottom edge of the phone. Carefully release the remaining snaps on the opposite side of the housing. Endo Assembly Figure 7. Removing the Endo Assembly To replace the Endo Assembly Insert the tabs at bottom end of the front housing into the rear housing.

  • Page 25: Removing And Replacing The Front And Rear Endo Housings

    Level 1 and 2 Service Manual Disassembly Removing and Replacing the Front and rear Endo housings To remove the Front and Rear Endo Housings Remove the Battery door, battery, Rear housing, and endo assembly as described in the procedures. Carefully use the flat end of the disassembly tool to pry the camera flex connector out of its socket (see Figure 8).
  • Page 26 Disassembly A835 Using the flat end of the disassembly tool, first disconnect the display assembly flex connector and then the keypad flex connector (see Figure 9). Display Flex Connector Keypad Flex Connector 031674o Figure 9. Removing the Display flex connector and Keypad flex connector...
  • Page 27 Level 1 and 2 Service Manual Disassembly Completely separate the front and rear endo housings. To Replace the Front and Rear Endo Housings Align the front and rear endo housings. Insert the keypad flex connector to its socket. Insert the display flex connector into its socket. 10.

  • Page 28: Removing And Replacing The Display Assembly

    Disassembly A835 Removing and Replacing the Display Assembly To remove the display assembly Follow the procedures to remove the: • Battery • Front Housing • Rear Housing • Front and rear Endo Assembly Peel the softkey connector strip away from the bottom of the display assembly, to disconnect the keyboard flex connector from the display.
  • Page 29 Level 1 and 2 Service Manual Disassembly • Front and Rear Endo Assembly • Rear Housing • Front Housing • USIM Card • Battery 6809464A28 October 30, 2003...

  • Page 30: Removing And Replacing The Keypad

    Disassembly A835 Removing and Replacing the Keypad To remove the keypad Follow the procedures to remove the: • Battery door • Battery • Endo assembly Use the plastic tweezers to lift the keypad out of the front housing. Keypad Front Housing Figure 11.

  • Page 31: Removing And Replacing The Camera

    Level 1 and 2 Service Manual Disassembly Removing and Replacing the Camera To remove the camera Ensure the phone is turned off. Remove the Battery door, battery, Front and rear housings, Endo assembly, and transceiver board as described in the procedures. Carefully lift the bottom of the camera away from the phone, sliding it off the phone’s antenna at the top.

  • Page 32: Removing And Replacing The Real-Time Clock (Rtc) Battery

    Disassembly A835 Removing and Replacing the Real-Time Clock (RTC) Battery Use only non-conductive tools, such as the plastic disassembly tool and the plastic tweezer, when removing and replacing the RTC battery. To remove the RTC battery Follow the procedures to remove the: •...

  • Page 33: Removing And Replacing The Microphone

    Level 1 and 2 Service Manual Disassembly Removing and Replacing the Microphone To remove the microphone Follow the procedures to remove the: • Battery Door • Battery • Front Housing • Endo assembly • Rear Housing Use the pointed end of the disassembly tool to gently pry the microphone from its socket in the shield spacer as shown in Figure 14.

  • Page 34: Umts Subscriber Identity Module (Usim) Identification Label

    The MSN is an individual unit identity number and remains with the unit through- out its life. The MSN can be used to log and track a phone on Motorola's Service Center Database. The MSN is divided into 4 sections as shown in Figure 15.
  • Page 35 Level 1 and 2 Service Manual UMTS Subscriber Identity Module (USIM) Identifica- tion Label International Mobile Station Equipment Identity (IMEI) The International Mobile station Equipment Identity (IMEI) number is an individual number unique to the PCB and is stored within the unit's memory. The IMEI uniquely identifies an individual mobile station and thereby provides a means for controlling access to GSM networks based on mobile station types or individual units.

  • Page 36: Troubleshooting

    Troubleshooting A835 Troubleshooting Troubleshooting Chart Table 6. PF 0B91 Telephone: Level 1 and 2 Troubleshooting Chart Symptom Probable Cause Verification And Remedy 1. Telephone will not turn on or stay on. a) Battery either discharged or Measure battery voltage across a 50 ohm (>1 defective.
  • Page 37 Level 1 and 2 Service Manual Troubleshooting Table 6. PF 0B91 Telephone: Level 1 and 2 Troubleshooting Chart (Continued) Symptom Probable Cause Verification And Remedy b) Earpiece speaker defective. Temporarily replace the speaker with a known good speaker. Ensure good connection. Place a call and verify improvement in earpiece audio.

  • Page 38: Manual Test Mode

    Troubleshooting A835 Manual Test Mode Motorola PF 0B91 telephones are designed with a manual test mode capability. This allows service personnel to verify functionality and troubleshoot by entering keypad commands. To enter the manual test command mode, press the following from idle: M 0 4 8 2 6 3 * There must be no more than 2 seconds between each of the keys pressed in the sequence.
  • Page 39 Level 1 and 2 Service Manual Troubleshooting Table 7. Level 2 3G Handset Test Commands (Continued) Opcode Opcode Key Entry Description Field Field Value (Decimal) Mnemonic Format AUD_LPB 4 *<Loopback Enable audio Field 1 0 = PCAP loopback Type> * loopback 6 = CODEC loopback <Action>OK...

  • Page 40: Manual Test Mode Response Codes

    Troubleshooting A835 Table 7. Level 2 3G Handset Test Commands (Continued) Opcode Opcode Key Entry Description Field Field Value (Decimal) Mnemonic Format VERSION 57 *<version Retrieve SW Field 1 016000 = DSP Version Type>OK version 017000 = User (login) of process that created this file...

  • Page 41: Level 2 Troubleshooting Procedures

    Level 1 and 2 Service Manual Troubleshooting Level 2 Troubleshooting Procedures A fully charged battery is all that’s needed to perform the procedures described in this section. For each test, enter the Manual Test Command Mode as described in “Manual Test Mode” on page 38, then enter the codes listed. Vibrator Test (Suspend) 3*0*1...

  • Page 42: Part Number Charts

    A835 Part Number Charts The following section provides a reference for the parts associated with A835 telephones. Related Publications Motorola A835 Wireless Phone User Guide 6809468A81 (SJJN5396) Motorola A835 Wireless Phone Reference Guide 6809471A86 (SJJN5590) Exploded View Parts List Table 9. Parts List...

  • Page 43: Exploded View Diagrams

    Level 1 and 2 Service Manual Part Number Charts Exploded View Diagrams Figure 16. Exploded View Diagram (Siemens Model) 6809464A28 October 30, 2003...
  • Page 44 Part Number Charts A835 Figure 17. Exploded View Diagram (Motorola Model) October 30, 2003 6809464A28...

  • Page 45: Model Dependant Housing Part Numbers

    Level 1 and 2 Service Manual Part Number Charts Model Dependant Housing Part Numbers Table 10. Model Dependent Housing Part Numbers Item Description Part Number Front Housing Assembly Motorola 1589270N01 Front Housing Assembly Siemens 1588133N02 Rear housing Assembly Motorola 1589242N01 Rear Housing Assembly Siemens...
  • Page 46 1 and 2 A835 689464A28 Level 1 and 2 Service Manual Index Index Symbols housing cover rear, removing and replacing 28 accessories identification connector ports 12 international mobile station equipment identity 35 alert mechanical serial number 34 indicators 13 product 5...
  • Page 47 Index A835 MSN 34 replacing battery 18 battery cover 18 cover plate 34 names display assembly 34 product 5 keypad 30 microphone 33 Real Time Clock Battery 28 rear housing 28 operation 12 rear housing cover 28 alert settings 15...
  • Page 48 Level 1 and 2 Service Manual Index test equipment 17 text entry indicator defined 13 tools, disassembly 17 transceiver board, removing and replacing 20 troubleshooting chart 36 manual test mode 38 manual test mode commands 38 procedures 41 test command response codes 40 UMTS subscriber identity module (USIM) 34 USIM 34 vibrate alert...
  • Page 50 MOTOROLA, the Stylized M Logo, and all other trademarks indicated as such herein are trademarks of Motorola, Inc. Truesync is a trademark of Starfish Software, Inc.. ® Reg. U.S. Pat. & Tm. Off.  2003 Motorola, Inc. All rights reserved.

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