Unication NP88 POCSAG Manual de Serviço

SERVICE MANUALNP88 FLEXNP88 EncoreâPRO EncoreâNP88 FLXä

June 21, 2004 1-5NP88 FLEX GENERALProduct Overview( )( )( )( )is used to turn the pager on and read messages G uide listed

1-6 June 21, 2004GENERAL NP88 FLEXProduct OverviewWhen a battery i s first inserted into the pager, the pager powers up in the OFFstate. In this cold

June 21, 2004 1-7NP88 FLEX GENERALProduct OverviewThe pager indicators (also known as icons) are listed in Table 1-1.Status ScreenThe Status screen co

1-8 June 21, 2004 GENERAL NP88 FLEXProduct OverviewStandard FeaturesTone-Alert OperationThis is the standard operating modeofthepagerinwhich it respo

June 21, 2004 1-9NP88 FLEX GENERALProduct OverviewVIBRA-Page® OperationVIBRA-Page is a standard feature in NP88 FLEX pagers. The pager isequipped with

1-10 June 21, 2004 GENERAL NP88 FLEXProduct OverviewConfirmation AlertWhen switched from tone-only to silent mode, the pager vibra tes for a short pe

June 21, 2004 1-11NP88 FLEX GENERALProduct OverviewSelective Message EraseTheusercandeletethemessagecurrentlydisplayed.Asingleunprotectedmessageis era

1-12 June 21, 2004 GENERAL NP88 FLEXProduct OverviewAutomatic ResetThe eight-second paging alerts automatically stop unless manually reset (halted)by

June 21, 2004 1-13NP88 FLEX GENERALProduct OverviewDate FormatThe d ate can be shown in the U.S. style with the month followed by the day or inthe Eur

1-14 June 21, 2004GENERAL NP88 FLEXProduct Overviewspecific options that are available for group call, and the corresponding addressesthat are act

June 21, 2004 1NP88 FLEX ForewordForewordUnication maintainsaworldwide organization that is dedicated toprovide respon-sive, full-service customer sup

June 21, 2004 1-15NP88 FLEX GENERALProduct OverviewFLEX-Specific OptionsGroup Call/Independent Second AddressThegroupcall optionallowsmultiplepagersto

1-16 June 21, 2004 GENERAL NP88 FLEXProduct OverviewAutomatic Message FormattingThis system-driven feature allowstheusertoviewa10 characternumericmes

June 21, 2004 1-17NP88 FLEX GENERALTheory of OperationTheory of OperationThe NP88 FLEX pagers consists of a radio frequency (RF) receiver sectionand a

1-18 June 21,2004GENERAL NP88 FLEXTheory of OperationGeneral Circuit DescriptionThe following information describes the general theory of operation fo

June 21,2004 1-19NP88 FLEX GENERALTheory of OperationReceiverThe antenna receives the modulated RF paging signal and couples it to theamplifier/presel

1-20 June 21, 2004 GENERAL NP88 FLEXPaging Coding SchemesFLEX Paging Format, Code, and Code CapacityAFLEXtransmissioncycleis4minuteslonganddividedint

June 21, 2004 1-21NP88 FLEX GENERALPaging Coding SchemesEleven message blocks containing interleaved data follow the sync block. Data isinterleaved wi

1-22 June 21, 2004GENERAL NP88 FLEXMaintenanceMaintenanceRemoving/Replacing the Battery1. Locate the ribbed battery door lock on the side of the pa

June 21, 2004 1-23NP88 FLEX GENERALMaintenanceRemoving the Back Cover1. Hold the pager with the back cover facing up .Figure 1- 10.When performing the

1-24 June 21, 2004GENERAL NP88 FLEXMaintenance3. Twist the disassembly tool counterclockwise while lifting it up toward the backhousing.. The latch

2 June 21,2004Foreword NP88 FLEXComputer Software CopyrightsThe Unication products described in this manualmayincludecopyrighted Unicationcomputerprog

June 21, 2004 1 -25NP88 FLEX GENERALMaintenanc

1-26 June 21, 2004GENERAL NP88 FLEXMaintenanceRemoving the Receiver Board1. Removing the battery, battery cover, and back and front cover accordin

June 21, 2004 1-27NP88 FLEX GENERALMaintenanceRemoving the Light Guide and Snubber Pad1. Remove the battery, battery cover, back and front cover, and

1-28 June 21, 2004 GENERAL NP88 FLEXTroubleshootingTroubleshootingNP88 FLEX pagers combine leadless-component technology with a uniqueminiaturedesign

June 21, 2004 1-29NP88 FLEX GENERALTroubleshootingFLEX Pagers1. With the pager in the OFF mode, press the button eight (8) times within 3secondsto en

1-30 June 21, 2004 GENERAL NP88 FLEXTroubleshootingdistortion), and timing of pulses. The input and output oscilloscope check easilyisolates a defect

June 21, 2004 1-31NP88 FLEX GENERALTroubleshootingFigure 1-29. General Troubleshooting FlowchartMEASURE BATTERY VOLTAGE.STARTDECODES PROPERLY? ALIGNM

1-32 June 21, 2004GENERAL NP88 FLEXTroubleshootingPaging Sensitivity CheckPaging sensitivity is estimated by reducing the RF input signal level to th

June 21, 2004 1-33NP88 FLEX GENERALTroubleshooting9. Usingthetestencoder,initiatethepagingcode.Thepageremitsaninterruptedalert tone each time the pagi

1-34 June 21, 2004GENERAL NP88 FLEXTroubleshootingCircuit ChecksRefer to the applicable receiver section in this publication for identification of th

GENERAL

June 21, 2004 1-35NP88 FLEX GENERALTroubleshooting3. Refer to the applicable schematic waveform and voltage information in theappropriate supplement.4

1-36 June 21, 2004GENERAL NP88 FLEXTroubleshooting4. Ensure the pager is in self-diagnostic mode 5 (refer to "Self-Diagnostic Fea-ture").5.

June 21, 2004 1-37NP88 FLEX GENERALTroubleshooting8. Check the RF takeover:a. Apply 1.3 Vdc to the battery contacts.b. Monitor M1 with ac voltmeter.c

1-38 June 21, 2004GENERAL NP88 FLEXTroubleshooting• If the bandwidth is still outside the prescribed limits , replace the IFCrystal Filter.• If the b

June 21, 2004 1-39NP88 FLEX GENERALTroubleshootinga. If yes, the backend is properly aligned; no further action is needed.b. If no, realign the backen

DECODER

June 21,2004 2-iNP88 FLEX DECODERContentsContentsModel Numbers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

June 21,2004 2-1NP88 FLEX DECODERModel NumbersModel NumbersRefer t o the applicable receiver section for a list of model numbers, their descrip-tions,

2-2 June21,2004DECODER NP88 FLEXOperating ModesOperating ModesThere are three basic modes of operation of the NP88 FLEX decoder:power-up, page search

June 21,2004 2-3NP88 FLEX DECODEROperating ModesData-decoding Interval - FLEX PagerWhen t he pager powers up, the receiver is turned on, and the decod

June 21,2004 1-ivNP88 FLEX GENERALContentsContentsAbout This Publicat

2-4 June 21,2004DECODER NP88 FLEXCircuit DescriptionCircuit DescriptionThe decoder section consists of five functional blocks:• Power Circuits• Suppor

June 21,2004 2-5NP88 FLEX DECODERCircuit DescriptionTheµCcontrols all major functions of the decoder, including processing of receiverdatapassingthrou

2-6 June 21,2004DECODER NP88 FLEXTroubleshootingTroubleshootingIf the pager failed the paging sensitivity check but passed the 10 dB rise measure-ment

June 21,2004 2-7NP88 FLEX DECODERTroubleshootingFLEX PagersNo Power-Up1. Ensure battery contacts are good.2. Check Support Module pin 40 for a high t

2-8 June 21,2004DECODER NP88 FLEXTroubleshootingNo Display or Bad Display on Power-UpCheck thesolder connection between the circuitboardand the Heat S

June 21,2004 2-9NP88 FLEX DECODERTroubleshootingNo Audible AlertEnsure the following before initiating this troubleshooting procedure:a. Verify the pa

2-10 June 21,2004DECODER NP88 FLEXTroubleshootingNo Vibrator AlertEnsure the following before initiating this troubleshooting procedure:a. Verify the

June 21,2004 2-11NP88 FLEX DECODERTroubleshootingNo BacklightingEnsure the following before initiating this troubleshooting procedure:a. Verify the lo

2-12 June 21,2004DECODER NP88 FLEXTroubleshootingGood Power-up Alert, but DOES NOT Page1. Ensure receiver connection is clean and free of debris.2. Fo

RECEIVER

June 21,2004 1-1NP88 FLEX GENERALAbout This PublicationAbout This PublicationUsing t his manual and the many suggestions contained in it assures prope

NP88 FLEX RECEIVERContents3VHF RECEIVERContentsSpecifications ...3-1

NP88 FLEX RECEIVERSpecifications!! 578 and 5846881020B803VHF RECEIVER 3VHF RECEIVERJune 21, 2004 3-1SpecificationsFLEXFrequency Stability±2.5

RECEIVER NP88 FLEXCircuit DescriptionThe following information describes the circuitry specific to the NP88 Flex 900MHz pager with a synthesizer rece

NP88 FLEX RECEIVERMixer Circuit Mixer is to mix RF signal (Fr) and first local oscillator signal (Flo), and it will bring the first intermediate

RECEIVER NP88 FLEXTuningSynthesized receivers are tuned to the middle of the bandsplit at the factory for optimal performance across the band. To ens

NP88 FLEX RECEIVEROscillator FrequenciesOscillator Frequencies- FLEX PagerTable 3-1. First and Second Oscillator Frequencies for FLEX 900MHz CARRIER

1-2 June 21,2004 GENERAL NP88 FLEXAbout This PublicationRevisionsAny changes that occur after manuals a re printed are described in PublicationRevisi

June 21, 2004 1-3NP88 FLEX GENERALSpecificationsSpecificationsPaging Sensitivity:Refer to specific receiver information.Spurious & Image Rejection

1-4 June 21,2004GENERAL NP88 FLEXProduct OverviewProduct OverviewTheU nication NP88FLEX pagers are miniature, microcomputer-controlledFMreceiversthato