SERVICEMANUALALPHA GOLD6881020B80SERVICEMANUALSERVICEMANUAL
1-4GENERAL Product OverviewProduct OverviewThe Unication Alpha Gold pager are miniature, microcomputer-controlled FM receivers with
MAY 16, 2005 5-9 VHF Decoder Board PCB Diagram Alpha Gold Diagram PCB Diag
5-10 MAY 16, 2005 Alpha GoldDiagram PCB Diagram Figure
MAY 16, 2005 5-11 Alpha Gold Diagram PCB Diag
5-12 MAY 16, 2005 Alpha GoldDiagram PCB Diagram Figu
MAY 16, 2005 5-13 Alpha Gold Diagram PCB Diagr
5-14 MAY 16, 2005 Alpha GoldDiagram PCB Diagram Figure 5-14 Decoder Boa
MAY 16, 2005 5-15 Alpha Gold Diagram PCB Diagram Figure 5-15 Decoder Board LOW
5-16 MAY 16, 2005 Alpha GoldDiagram PCB Diagram Figure 5-16 Decoder Board POW
MAY 16, 2005 1 2 3 4 56ABCD654321DCBATitleNum
MAY 16, 2005
MAY 16, 2005 1-5Alpha Gold GENERAL AddressingEach pager can be programmed for multiple personal,
MAY 16, 2005 TitleNumber RevisionSizeA4Date:
Table 1-1 lists the indicators, their uses, and their meanings. Certain indicators, annunciators, are displayed at the far left of the screen during p
Set Time or Set Alarm SelectorSet Time and AlarmLocked Message Lock MessageCursor on Locked MessageUnlock MessageMaildrop Message with Alert EnabledMa
Delete All MessagesPrint MessagePrint All MessagesTruncated Non-Ideographic Message Non-Ideographic Message ContinuedAlphanumeric Missing Fragment Ind
Alpha Gold
GENERAL Alpha Go
Alpha Gold GENERAL Product OverviewThe Down directional button is used to scroll down through a message one line at a t
Table 0-2. Standard Features Paging FeaturePager TypeDescriptionMessage StoragePersonal Messages are located on the first line; older messages are loc
Real-Time Clock and Alarm Clock Displays the time and date, time-and-date stamps all messages, and gives an alarm indication at a preset time. The tim
Memory RetentionIf the Non-Volatile Memory option is selected, all messages and pager settings remain in memory when the pager is turned off. If the o
Table 0-3. Ideographic Features Paging FeaturePager TypeDescriptionErrored Message Character SymbolIf the Errored Data Indication programmable option
Memory CleanupErases all previously read, unprotected personal messages; all read maildrop messages; and all maildrop history files when the Delete Al
Programmable Pleasing AlertWhen this programmable option is set to custom, a menu in the Pager Programming Software is used to create a pleasing alert
Alternate PromptsThe power-up prompt and all source prompts can be customized and alternate prompts can be programmed for the following functions:• Ch
Table 0-7. Display Options Paging FeaturePager TypeDescriptionAuto BacklightCauses any button press to turn on the display backlighting in low-light
Table 0-8. Printing Options Paging FeaturePager TypeDescriptionManual PrintingIf enabled, messages can be printed by selecting the Print icon while th
Table 0-10. Over-the-Air Download Options Paging FeaturePager TypeDescriptionOTA Programming DisabledDisables over-the-air (OTA) programming. Pagers
a. When the circles are blinking:• Use the Up and Down buttons (F and G) to toggle between the set time and set alarm functions.• Use the Left and Rig
UsingthePrivate Time Function1.Select the Private Time (L) in the Function menu to display the Set Private Time screen (see Figure 1-10). 2.Use the L
Theory of OperationThe Unication Alpha Gold pager consist of a radio frequency (RF) receiver section and a microcomputer-controlled decoder section. A
General Circuit Description of Dual Conversion POCSAG PagersThe following information describes the general theory of operation for the Unication Alph
DecoderThe decoder consists of the microcomputer, Display module, external memoryThe Microcomputer performs the following:• Controls the receiver cir
MaintenanceThis section provides instructions for the disassembly of Unication Alpha Gold pager. Special tools are listed at the end of this section.
Replacing the Battery1. Position the new AA-size battery so the “+” and “−” markings on the battery match the polarity diagram in the battery compartm
4. Use the disassembly tool to disengage the first locking tab in the battery compartment by carefully prying outward (refer to Figure below).Alpha Go
5. After step 4 you can easily remove the back cover.Removing the Receiver Board1. Remove the battery door, battery, and back cover as described in th
2. Hold the decoder board down and gently pry the receiver circuit board up and away from the decoder circuit board at a point near the interconnect s
Removing the Decoder Board1. Remove the battery door, battery, back cover, receiver board and snubber pad as described in the earlier procedures.2. H
LCD Module Removal1. Remove the battery, battery door, latch band, back cover, receiver board, shock pad, and decoder board as described in the earlie
4. Carefully lift the front edge of the LCD module to expose the leads. 5. Apply heat with a soldering iron or hot air machine to the leads across bot
5. Place the LCD module in the fixture (refer to Figure below). 6. Slide the heat shield from left to right and from front to back to expose the leads
12. Connect the module switch pad to the frame locating pin by gently pressing them together. 13. Engage the light diffuser catches with the two slots
TroubleshootingUnication Alpha Gold pager's circuitry is contained in two individual sections. One section is the receiver board, and the other
Preliminary ChecklistUse the following table as a quick reference guide to determine the probable cause of some common pager problems and where to fin
Self-Diagnostic FeaturePOCSAG Pagers1. Ensure the pager is turned off. 2. Press the following sequence of buttons in rapid succession: Left H, Right I
6. Press the Read button ( ) to stop the alert.7. Press the Read button ( ) to enter self-diagnostic mode 4 (vibrator test). The pager vibrates and th
displayed. The or is displayed on the first line within 10 seconds of entering this test mode. The following is displayed upon successful test com
Failure analysis of RF board can be divide into following reasons • Sensitivity bad • Center frequency deviation • Local oscillator fail • Power circu
Sensitivity bad RF board sensitivity bad is the issue which often happened in pager, the issue might be happen with antenna matching, pre-a
MAY 16, 2005 1-iALPHA GOLD GENERAL ContentsAbout This Publication . . . . . . . . . . . . . . . . . . . . . . .
Basic setting: Connect probe of scope with frequency counter, put probe on TP4, adjust SG to center frequency and out put signal from normal Loa
Power circuit is abnormal Measure the voltage of TP3 by multi-meter, the value should be 1.2 ~ 1.5V, if it is abnormal, to check battery volt
DECODER
6881020B80MAY 16, 2005 2-iAlpha Gold
MAY 16, 2005 2-1Alpha Gold DECODER Operating ModesOperating ModesThere are four basic modes of operation for the Unication
2-2 MAY 16, 2005DECODER Alpha Gold Operating ModesPage Alert/Display ModeA button press or an incoming message changes t
MAY 16, 2005 2-3Alpha Gold DECODER Circuit DescriptionCircuit DescriptionThe decoder co
2-4 MAY 16, 2005 DECODER
MAY 16, 2005 2-5Alpha Gold DECODER TroubleshootingTroubleshootingThis section contains the following common conditions r
2-6 MAY 16, 2005 DECODER Alpha Gold TroubleshootingSTARTCHECK FOR VCC AT U9 PINS 2 (1.3 V).FAILOKOKOKOKFAILFAILOKFAILFAI
MAY 16, 2005 2-7Alpha Gold DECODER TroubleshootingGood Power-up Alert, But No DisplayRefer to the flowchart in Figure 2
2-8 MAY 16, 2005 DECODER Alpha Gold TroubleshootingGood Power-up Alert, But Cannot PageRefer to the flowchart in Figure
MAY 16, 2005 2-9Alpha Gold DECODER TroubleshootingButtons Do Not Respond Refer to the flowchart in Figure 2-4 and the foll
2-10 MAY 16, 2005 DECODER Alpha Gold Troubleshooting2. Verify the backlighting is activated correctly by pressing the Fun
MAY 16, 2005 2-11Alpha Gold DECODER TroubleshootingNo Vibrator AlertsUse the following instructions and the flowchart in F
2-12 MAY 16, 2005 DECODER
MAY 16, 2005 1-1ALPHA GOLD GENERAL About This PublicationAbout This PublicationUsing this service manua
VHF RECEIVER
MAY 16, 2005 3-iAlpha Gold
MAY 16, 2005 3-1Alpha Gold VHF RECEIVER SpecificationsSpecificationsAARD406/7X ReceiversFrequency Stability:(-10°C to
3-2 MAY 16, 2005 VHF RECEIVER Alpha Gold Circuit Description The following information describes the circuitry specific t
MAY 16, 2005 3-3Alpha Gold VHF RECEIVER Mixer Circuit Mixer is to mix RF signal (Fr) and first local oscillator signal
3-4 MAY 16, 2005 VHF RECEIVER Alpha Gold Tuning Synthesized receivers are tuned to the middle of the bandsplit at the
MAY 16, 2005 3-5Alpha Gold VHF RECEIVER Oscillator Frequencies - POCSAG PagerOscillator Frequencies - POCSAG Pager
UHF RECEIVER
1-2MAY 16, 2005GENERAL
MAY 16, 2005 4-iAlpha Gold
MAY 16, 2005 4-1Alpha Gold UHF RECEIVER SpecificationsSpecificationsAARE ReceiversFrequency Stability:5 ppm of refere
UHF RECEIVER Alpha Gold SpecificationsCircuit Description The following information describes the circuitry specific t
MAY 16, 2005 4-3Alpha Gold UHF RECEIVER SpecificationsMixer Circuit Mixer is to mix RF signal (Fr) and first local os
4-4 MAY 16, 2005 UHF RECEIVER
MAY 16, 2005 4-5Alpha Gold UHF RECEIVER Oscillator FrequenciesOscillator Frequencies
Diagram
MAY 16, 2005 1-3Alpha Gold
MAY 16, 2005 5-iAlpha Gold
MAY 16, 2005 Alpha Gold Diagram PCB Diagram Figure 5-1 Receiver
MAY 16, 2005 Alpha GoldDiagram PCB Diagram Figure 5-2 Receiver Board
MAY 16, 2005 Alpha Gold Diagram PCB Diagram Figure 5-3 Receiver
MAY 16, 2005 Alpha GoldDiagram PCB Diagram Figure 5-4 Receiver B
MAY 16, 2005 Alpha Gold Diagram PCB Diagram Al
MAY 16, 2005 Alpha GoldDiagram PCB Diagram Fig
MAY 16, 2005 Alpha Gold Diagram PCB Diagram Figure 5-7
MAY 16, 2005 Alpha GoldDiagram PCB Diagram Figure 5-8
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