Kenwood-TK-481-Service-Manual电路原理图.pdf

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1、 2001-3 PRINTED IN JAPANB51-8408-20 (N)1015800MHz/900MHz FM TRANSCEIVERTK-480/481SERVICE MANUALGENERAL . 2SYSTEM SET-UP . 2OPERATING FEATURES . 3REALIGNMENT. 11CIRCUIT DESCRIPTION. 14SEMICONDUCTOR DATA. 20DESCRIPTION OF COMPONENTS . 23PARTS LIST. 24EXPLODED VIEW . 30PACKING . 31ADJUSTMENT . 32TERMIN

2、AL FUNCTION . 40PC BOARD VIEWSDISPLAY UNIT (X54-3210-XX) . 41TX-RX UNIT (X57-5630-XX) . 47SCHEMATIC DIAGRAM . 53BLOCK DIAGRAM. 57LEVEL DIAGRAM (TK-480) . 59LEVEL DIAGRAM (TK-481) . 60KNB-16A/17A (Ni-Cd BATTERY) . 61KPG-36 (PROGRAMMING INTERFACE CABLE) . 61KSC-19 (CHARGER) . 61SPECIFICATIONS. 62CAUTI

3、ONWhen using an external power connector,please use with maximum final module pro-tection of 9V.CONTENTSREVISED IIPhoto is TK-480/481 K2 type.(Produced in Singapore)This service manual applies to products with 30100001 orsubsequent serial numbers.Knob (PTT)(K29-5157-03)Whip antenna(T90-0636-25) : TK

4、-480(T90-0640-25) : TK-481Knob (ENC)(K29-5232-03)Knob (VOL)(K29-5231-03)Panel assy(A62-0981-04)Cabinet assy(A02-3659-03) : K2Badge(B43-1139-04)Packing(G53-0841-02) : K22TK-480/481GENERAL / SYSTEM SET-UPINTRODUCTIONSCOPE OF THIS MANUALThis manual is intended for use by experienced techni-cians famili

5、ar with similar types of commercial grade com-munications equipment. It contains all required service in-formation for the equipment and is current as of this publica-tion date. Changes which may occur after publication arecovered by either Service Bulletins or Manual Revisions,which are issued as r

6、equired.ORDERING REPLACEMENT PARTSWhen ordering replacement parts or equipment informa-tion, the full part identification number should be included.This applies to all parts : components, kits, and chassis. Ifthe part number is not known, include the chassis or kitnumber of which it is a part and a

7、sufficient description ofthe required component, for proper identification.PERSONNEL SAFETYThe following precautions are recommended for person-nel safety : DO NOT transmit until all RF connectors are secure andany open connectors are properly terminated. SHUT OFF this equipment when near electrical

8、 blastingcaps or while in an explosive atmosphere. This equipment should be serviced by only qualified tech-nicians.SERVICEThis radio is designed for easy servicing. Refer to theschematic diagrams, printed circuit board views, and align-ment procedures contained within.NOTEWE CANNOT guarantee oscill

9、ator stability when usingchannel elements manufactured by companies other thanKENWOOD or its authorized agents.You must use the KPG-49D to program TK-480/481 trans-ceivers with a serial number of 30100001 or greater. Youcannot use the KPG-35D for those radios.TK-480/481 transceivers with a serial nu

10、mber of30100001 or greater have a red triangle in the KENWOODlogo label (B43-1139-04) on the front panel. You will alsofind the model name plate marked as “Ver 2.0” on the rearof the transceiver.Unit TX-RX unit Display unitModel up to32 memories each with a memory dial of up to 16 digits andan A/N o

11、f up to 10 digits per memory.a73 MonitorUsed to release signalling or squelch when operating as aconventional. It is also used to reset option signalling.a73 RedialPressing this key when System/Group is shown, displaysthe previously transmitted DTMF code. Pressing PTT atthis time, transmits the code

12、 that is currently displayed.a73 RF power lowUsed to temporarily switch transmission output to lowpower. Turning the function on enables:HiLow, LowLowKey states are backed up, except in the PC mode whenthey are reset.a73 ScanPress this key starts scanning. Pressing this key stopsscanning.a73 Scan De

13、l/AddUsed to select whether system scan routines are usedduring system scan. Each pressing of the key (to ON)toggles between lockout and lock. The scan routine isstarted when on lock. The DEL indicator flashes when thesystem is on lockout.a73 Scan temporary deleteThis key is temporarily deleted a sy

14、stem being scanned.If you press this key when scan is stopped (when a call isbeing received from another station), the system is tempo-rarily deleted and scanning restarts.This key operates even when “Scan Type” is set to “ListType System Scan”.a73 ScramblerIf a scrambler code (1 to 4) has been set

15、in the FPU, anunderscore (“_”) appears at the extreme right of the LCDdisplay when scrambler is active. Pressing this key changesON/OFF of scramble operation.Holding this key down for 2 seconds sets Scramble CodeSelect Mode.5TK-480/481OPERATING FEATURESa73 System up/downWhen the key is pressed each

16、time, the system numberto be selected is incremented/decremented and repeats ifheld for one second or longer.a73 Telephone disconnectPressing this key ends an RIC connection (disconnectsthe telephone line).a73 NoneSounds error operation beep, and no action will occur.Use this function when the trans

17、ceiver is required to bemore simple operated.2-4. DisplayAlphanumeric displayThe twelve-character dot matrix alphanumeric displayshows the system and group numbers. You can programsystem and group names with up to ten characters inplace of these numbers. The left display is used as a de-lete indicat

18、or ( ) and the right is used for the selectivecall ( ) or scrambler ( _ ) function. The delete/add indica-tor shows the systems locked out of the scanning se-quence. Selective call and scrambler are optional func-tions that can be programmed.3. Scan Operating3-1. System scanSystem scan can be select

19、ed with the “Scan” key by pro-gramming the scan feature. When the “Scan” key ispressed and the “SCN” mark appears, scan mode in en-tered. Scanning starts from the system following the cur-rently displayed system. When a call is received, scanningstops, and the system and group are displayed.When the

20、 system knob or programming key is touchedduring scanning, the scan stops and the revert system orgroup can be changed. Scanning resumes one second afterthe key is released.System scan consists of the following 2 types.a73 Fix system scanAll the set systems except locked-out ones are scanned.If the

21、DEL/ADD feature is assigned to the programmablekey, it can be controlled from the front panel.a73 List type system scanA scan list can be set for each system.The list to be scanned can be changed by changing thedisplay system.If many system have been set, the scan speed can beincreased by narrowing

22、the systems to be scanned withscan lists.3-2. System lockoutThe system lockout feature is used to lock systems outof the scan sequence, and can be selected by programmingin the following two ways:a73 Fixed lockoutThe system to be locked out is selected by programming.When a locked system is selected

23、, the Delete ( ) indicatorappears on the left of the SYSTEM indicator. The revert sys-tem is scanned even if it is locked out. If there is a lockedsystem, the Delete ( ) indicator flashes during fixed scan-ning.a73 User selectable lockoutIf the scan lockout feature is programmed to a key, theuser ca

24、n lock systems out of the scan sequence with thekey. To lock a system out of the scan sequence, press thekey when the system is displayed. The Delete ( ) indicatoris displayed on the left of the SYSTEM indicator.Sub displayDisplays the system, channel and group numbers. Alsodisplays various function

25、s, such as TA.P (Priority) indicatorThe P indicator ( ) appears when a selected channel isprogrammed as priority, in conventional operation.MON (Monitor) indicatorThe MON indicator appears when the button pro-grammed as MONITOR is pressed.SVC (Service) indicatorThis icon is not used on this transcei

26、ver.SCN (Scan) indicatorThe SCN indicator appears when using Scan mode.LO indicatorAppears when low power is selected.Handset indicatorThe handset indicator ( ) appears when the selectedgroup is programmed as telephone IDs.MAIL indicatorFlashes when a status message (FleetSync) is re-ceived. Lights

27、when a status message is stored in thestack memory.P96TK-480/481OPERATING FEATURESTo unlock a system, select the system and press the key.The Delete ( ) indicator disappears to indicate that the sys-tem has returned to the scan sequence. The revert systemis scanned even if it is locked out. If there

28、 a locked system,the Delete ( ) indicator flashes during fixed scanning. If allsystems are locked out, the scan stops and only the revertsystem is received.3-3. Drop-out delay time (Scan resume time)If a call is received during scan, the scan stops. The scanresume time can be programmed as 0 to 300

29、seconds inone-second increments. The default value is 3 seconds.3-4. Dwell timeThe dwell time is the time after transmission ends untilthe scan resumes in scan mode. It can be set 0 to 300 sec-onds by programming. The default value is 3 seconds.3-5. System/Group revertSystem/Group revert can be prog

30、rammed for one of thefollowing;a73 Last called revertThe system or group changes to the revert system orgroup when a call is received with the system or group be-ing scanned.a73 Last used revertIf a system/group call is received during scanning and thePTT button is pressed for transmission and respo

31、nse withinthe drop out delay time, the system or group is assigned asthe new revert system or group.a73 Selected revertIf the system/group was changed while scanning, thenewly selected system/group.a73 Selected + TalkbackIf the system/group was changed while scanning, thenewly selected system/group.

32、 The transceiver “talks back”on the current receive group.3-6. Scan message waitThe time for staying with the home repeater that re-ceives a signal during system scan and monitoring datamessages can be programmed. If there is no signal from thehome repeater, the system is scanned for about 50ms. Ift

33、here is a signal, three data messages are monitored. Nor-mally, three data messages are monitored for each system,and it can be increased in multiples of three data messagesper line to up to eight lines.If the repeater data message indicates that there is nocall, data monitoring is terminated and th

34、e home repeater ofthe next system is scanned.3-7. Group scan operationGroup scan can be programmed for each group. In addi-tion to the ID codes of the selected group, the ID codes ofthe other groups that are permitted for group scan are de-coded. (The two fixed ID and block decode codes are alwaysde

35、coded.)If, during group scanning, a call is received with one ofthe selectable group ID codes for which group scan is en-abled, the group display indicates the group number that thecall came in with. That group then becomes the new se-lected group. Group scan resumes after the specified drop-out del

36、ay time or dwell time shared by the system scanelapses.3-8. In Conventional system.If QT or DQT is set for the channel, the channels, includ-ing signalling, are scanned.In case of the priority group is set in conventional sys-tem, if a group scan (including group scan during a systemscan) temporaril

37、y stops (receiving) in a group that does nothave priority, a look back is performed to the priority group.Look back is performed according to the look back time Aand B settings. If a call is received on the priority group, re-ception immediately switches to the priority group.4. Details of Features4

38、-1. Time-out timerThe time-out timer can be programmed in 15 secondsincrements from 15 seconds to ten minutes. If the transmit-ter is keyed continuously for longer than the programmedtime, the transmitter is disabled and a warning tone soundswhile the PTT button is held down. The alert tone stopswhe

39、n the PTT button is released.4-2. Sub LCDYou can use 3-digit the display to display the systemnumber, channel number or group number. It is useful whenthe main (12-digit) display indicates system, group or chan-nel name or other functions.4-3. Selective Call Alert LEDYou can select whether or not th

40、e LED on the transceiverflashes in an orange color when selective call was occurred.4-4. PTT IDPTT ID provides a DTMF ANI or MSK ID to be sent withevery time PTT (connect ID at beginning of transmission,disconnect ID at end of transmission, or both).You can program PTT ID “on” or “off” for each grou

41、pchannel (DTMF). The contents of ID are programmed foreach transceiver.The transceiver is capable to have ID. The format isDTMF. The timing that the transceiver sends ID is program-mable.BOT : Connect ID is sent on beginning of transmission.EOT : Disconnect ID is sent on end of transmission.Both : C

42、onnect ID is sent on beginning of transmissionand disconnect ID is sent on end of transmission.There is also “PTT ID” setting for each channel.7TK-480/481OPERATING FEATURES4-5. Radio passwordWhen the password is set in the transceiver, user can notuse the transceiver unless enter the correct passwor

43、d.This code can be up to 6 digits from 0 to 9 and input withthe keypad or selector, and “S” key.4-6. Battery WarningThis transceiver has battery warning feature. If the lowvoltage is detected during transmission, the transceiverwarns it by flashing red “LED”.Then more low voltage is detected during

44、transmission,the transceiver stops transmission and warns it by flashingred “LED” and beep.Please notice “standard” for the battery exchange,charging time by flashing red LED and beep.4-7. Minimum VolumeThe minimum volume is programmable (off (0) to 31).The transceiver remains the minimum volume lev

45、el how-ever the mechanical volume position is set to zero.4-8. Call indicatorThe call indicator can be programmed for each group. Intrunked system, it can be set to respond to a selectable de-code ID or one of two fixed IDs, except block IDs. When acall is received with a selectable decode ID, the c

46、all indicatorflashes. When a call is received with a fixed ID, the call indi-cator lights continuously.On a conventional system, the call indicator can be pro-grammed to light for each QT or DQT code. It keeps flashingwhile a call is being received. It is turned off by pressing anyfront panel key.4-

47、9. Free system ringbackThis feature is available only when a telephone intercon-nected ID code is selected. If a busy tone sounds when thePTT button is pressed, the transceiver enters this mode au-tomatically.When the PTT button is released, a beep sounds for400ms to indicate that the mode has been entered. If thescan is on, it is resumed (the “SCN” mark goes on). Wh