Kenwood-TK-290-Service-Manual电路原理图.pdf
© 2001-3 PRINTED IN JAPANB51-8423-10 (N)1023VHF FM TRANSCEIVERTK-290SERVICE MANUALPhoto is TK-290 K type.Does not come with antenna.Antenna is available as an option.CONTENTSGENERAL . 2SYSTEM SET-UP . 2OPERATING FEATURES . 3REALIGNMENT. 11CIRCUIT DESCRIPTION. 17SEMICONDUCTOR DATA. 25DESCRIPTION OF COMPONENTS . 26PARTS LIST. 28EXPLODED VIEW . 36PACKING . 37DISASSEMBLY FOR REPAIR . 38ADJUSTMENT . 39PC BOARD VIEWSFINAL UNIT (X45-3592-71) . 50CONTROL UNIT (X53-3930-XX). 51TX-RX UNIT (X57-5390-10) . 55SCHEMATIC DIAGRAM . 61BLOCK DIAGRAM. 67LEVEL DIAGRAM. 69TERMINAL FUNCTION . 70KNB-17A (Ni-Cd BATTERY) . 71KMC-25/26 (SPEAKER MICROPHONE) . 72KSC-19 (CHARGER) . 73KSC-20 (RAPID CHARGER) . 73KPG-36 (PROGRAMMING INTERFACE CABLE) . 73KRA-14 (HELICAL ANTENNA) . 73SPECIFICATIONS. BACK COVERCAUTIONWhen using an external power connector,please use with maximum final module protec-tion of 10VREVISEDAntenna(KRA-14 : Option)Cabinet assy(A02-2139-63)Knob assy (SEL)(K29-5282-04)Knob assy (VOL)(K29-5283-04)Panel assy(A62-0537-53)Knob assy(Side key)(K29-5441-04)2TK-290GENERAL / SYSTEM SET-UPINTRODUCTIONSCOPE OF THIS MANUALThis manual is intended for use by experienced techni-cians familiar with similar types of commercial grade com-munications equipment. It contains all required service in-formation for the equipment and is current as of the publica-tion data. Changes which may occur after publication arecovered by either Service Bulletins or Manual Revisions.These are issued as required.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, or chassis. If thepart number is not known, include the chassis or kit numberof which it is a part, and a sufficient description of the re-quired component for proper identification.PERSONNEL SAFETYThe following precautions are recommended for person-nel safety : DO NOT transmit until all RF connectors are verified se-cure and any open connectors are properly terminated. SHUT OFF and DO NOT operate this equipment nearelectrical blasting caps or in an explosive atmosphere. This equipment should be serviced by a qualified techni-cian only.SERVICEThis radio is designed for easy servicing. Refer to theschematic diagrams, printed circuit board views, and align-ment procedures contained within.NOTEWE CANNOT guarantee oscillator stability when usingchannel element manufactured by other than KENWOOD orits authorized agents.FCC COMPLIANCE AND TYPE NUMBERSModel Type acceptance number Frequency range ComplianceTK-290 ALH21893110 136174MHz Parts 22,74,80,90UnitX57-539X-XX X53-393X-XX X45-359X-XX DTMFModel replace or recharge the battery.Note : This indicator can be disabled by your dealer.Power switch/Volume controlTurn clockwise to switch ON the transceiver. Turn coun-terclockwise, until a click sounds, to switch OFF thetransceiver. Rotate to adjust the volume level.SelectorRotate this control to activate its programmable function(Page 8).Toggle switchSwitch the toggle position to activate its programmablefunction (Page 8).Top 1Top 2OrangeSide 1Side 2PTT (Push-To-Talk) switchPress this switch, then speak into the microphone to calla station.Press these PF (programmable function)keys to activate their programmable func-tions (Page 8)DTMF keypad (keypad models only)Press the keys on the telephone keypad to send DTMFtones.Universal connectorConnect the external speaker/microphone (optional)here. Otherwise, keep the supplied cover in place.1-2. DisplayAlphanumeric displayDisplays the operating group or channel number, or thegroup or channel name. When making a DTMF or 2 Tonecall, the display will alternate between CALL and thechannel. Also displays various menu functions.7 Segment displayDisplays the operating group or channel number. Alsodisplays tA (Talk Around), P1 (Priority1), P2 (Priority2), PP(Priority1 and Priority2), or HC (Home Channel); depend-ing on the function being used.A (Add) indicatorAppears when a channel is added to the scanning se-quence.SCN (Scan) indicatorAppears when Scan mode is active.MON (Monitor) indicatorAppears when the monitor function is active.LO (Low) indicatorAppears when low power is selected.OPT indicatorAppears when Operator Selectable Tone is enabled.AUX (Auxiliary) indicatorAppears when Aux is ON. Appears and blinks when theoptional scrambler board is enabled.Note : The alphanumeric and 7 segment displays can beinverted if a PF key or the toggle switch is programmedwith Invert Display (Page 8).ABSMA male typeantenna connectorBattery packrelease latchMicrophoneDisplaySpeaker4TK-2902. Scan Operating2-1. Scan Types Single Group ScanYou can scan all valid (ADD) channels in the displayedgroup that can be selected with the group selector. Multiple Group ScanYou can scan all valid (ADD) channels in the all valid(ADD) group.2-2. Scan Start ConditionOne or more non-priority channels must be added to allchannels that can be scanned. The transceiver must be innormal receive mode (PTT off).When you activate the key or the toggle switch (to rightposition) programmed to the scan function, the scan starts.The scan icon “SCN” lights and “SCAN” or revert channel(programmable) is indicated on 7-digit alphanumeric display.2-3. Scan Stop ConditionThe scan stops temporarily if the following conditions aresatisfied.1) A carrier is detected, then signalling matches on chan-nels for which receive the signalling is set by the pro-gramming software.2) A carrier is detected on the channel for which receivingsignalling is not set by the programming software orwhen the monitor (signalling cancel) function is activated.2-4. Scan Channel Types1) Priority channel 1 is the most important channel for thescan, and always detects a signal during scan and whenthe scan stops temporarily.2) Priority channel 2 is the next important channel for thescan, and always detects a signal during scan and whenthe scan stops temporarily at a channel other than prioritychannel 1.3) Non-priority channels detects a signal during scan. Forthe channels that can be selected with the group or chan-nel selector when the scan does not occur, adds an indi-cator “A” lights.2-5. Priority Channel SettingPriority channels 1 or 2 can be set as follows with theprogramming software (KPG-38D).1) Specify priority channels 1 or 2 as fixed priority channels.2) Make selected channels, priority channels.3) Operator delectableSpecify the initial channel before the operator changes it.2-6. Scan Type According to the Priority Channel1) When no priority channels are set : Only the non-prioritychannels are scanned.If a non-priority channel stops temporarily, it stops untilthere is no signal on the channel.OPERATING FEATURES2) When one priority channel is set : Either priority channel1 or 2 is scanned.If a non-priority channel stops temporarily, a priority chan-nel signal is detected at certain intervals.If a priority channel stops temporarily, it stops until thereis no signal on the priority channel.3) When two priority channels are set : The non-prioritychannel, priority channels 1 and 2 are scanned.If a non-priority channel stops temporarily, priority chan-nel 1 and 2 signals are detected at certain intervals.If priority channel 2 stops temporarily, the priority chan-nel 1 signal is detected at certain intervals.If priority channel 1 stops temporarily, it stops until thereis no signal on priority channel 1.2-7. Revert ChannelThe revert channel is used to transmit during scanningand set by the programming software (KPG-38D).1) Priority 1The transceiver reverts to the priority channel 1.2) Priority 1 with talkbackThe transceiver reverts to the priority channel 1.If you press PTT during a resume timer (dropout delaytime, TX dwell time) or calling, you can transmit on cur-rent channel to answer to the call however revert channelis set to priority channel 1.After resume time, scan re-starts and transmission chan-nel is return to priority channel 1.3) Priority 2The transceiver reverts to the priority channel 2.4) Priority 2 with talkbackThe transceiver reverts to the priority channel 2.If you press PTT during resume timer (dropout delaytime, TX dwell time) or calling, you can transmit on cur-rent channel to answer to the call however revert channelis set to priority channel 2.After resume time, scan re-starts and transmission chan-nel is return to priority channel 2.5) Selected channelThe transceiver reverts to the channel before scanning orthe channel that you changed during scan.6) Last called channelThe transceiver reverts to the last called channel duringthe scan.7) Last used channelThe transceiver reverts to the last used (transmitted)channel during scan. “Last used” revert channel in-cludes talkback function.8) Selected with talkbackThe transceiver reverts to the channel before scanning orthe channel that you changed during scan.2-8. Scan EndWhen you reactivate the key or the toggle switch (to leftposition) programmed to the scan function during scanmode, the scan ends.The scan icon “SCN” and “SCAN” or revert channel (pro-grammable) display goes off.5TK-2902-9. Temporarily Delete/AddIt is possible to delete or add channel temporarily duringscan. When scan stops on unnecessary channel for ex-ample by interference of the other party, activate the delete/add function (for example press the key), then that channelis deleted temporarily and scan re-start immediately.When you would like to add the deleted channel tempo-rarily to scan sequence, select the desired (deleted) channelduring scan, activate the delete/add function (for examplepress the key) before scan re-start.That channel is added temporarily to scan sequence. Thetemporary deleted or added channels are returns to pre-setdelete/add, when the transceiver exits from scan mode.3. Optional FeaturesYou can use these features using the programming soft-ware (KPG-38D).3-1. Alphanumeric Display (Group/Channel Name)The programming software (KPG-38D) enables you to setthe alphanumeric display for group/channel name. The totaltext size of group and channel name are 7-digits.For example, If you set 2-digits for group name, then youcan use 5-digits for channel name. The characters can beused as shown in Figure 1.3-2. Beep TonesThe beep tones (power on tone, control tone, warningtone, alert tone) are individually programmable to the fixedlevel 0 to 31 or follow the mechanical volume position.3-3. Minimum VolumeThe minimum volume is programmable (0 to 31). Thetransceiver remains the minimum volume level however themechanical volume position is set to zero.ABCDEFGH IJKLMNOPQRSTUVWXYZ1234567890-All onFig. 13-4. Squelch Threshold LevelSquelch threshold level value.0 (Most loose)15 (Most tight)3-5. BCL (Busy Channel Lockout) OverrideYou can transmit in spite of Busy Channel Lockout situa-tion. For example : To make an emergency voice call.To transmit under busy channel lockout situation, pressPTT once more within approx. 500ms after the PTT release.3-6. Selective Call Alert LEDYou can select whether or not the LED on the transceiverflashes in an orange color when Selective call was occurred.3-7. 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 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.3-8. Busy LEDYou can program the enable or disable the busy “LED”function when a carrier is detected. “Disable” saves batterylife.3-9. TX LEDYou can program the enable or disable the transmission“LED” function.3-10. 2-Digit 7-Segment DisplayYou can use 2-digit 7-segment the display to display thechannel number or group number. It is useful when themain (7-digit 13-segment) display indicates group or channelname.3-11. Invert DisplayMain (7-digit 13-segment) display and sub (2-digit 7-seg-ment) display can be programmed to invert display.It is easy to read the display when the operator sus-pended the transceiver on a waste belt. The operator alsocan change the display between normal and invert usingkey. Refer the invert display function of key function.3-12. Clear to TranspondThe transceiver waits the transpond of 2-Tone/DTMF ifchannel is busy until channel open. This feature preventsthe interference to other party.3-13. External SpeakerIt can be selected if the receive sound is made by SP-MicSP or the main body SP at a SP-Mic mount.3-14. Noise Cancelling MICEnable or disable the noise cancelling function of the in-ternal microphone. It is not valid for the external SP/MIC.OPERATING FEATURES6TK-2903-15. Mode (Enable/Disable)The transceiver has many special modes mainly for main-tenance.· Self Programming mode· Panel Test mode· Clone mode· Firmware Programming mode· Version info.It is possible to set enable/disable for each mode. Werecommend to set these mode to Disable after set up tosave contents.3-16. IDThe transceiver is capable to have ID. The format isDTMF, MSK or ANI board (if installed). The timing that thetransceiver sends ID is programmable.Connect ID : Connect ID is send on beginning of trans-mission.Disconnect ID : Disconnect ID is send on end of trans-mission.Both : Connect ID is send on beginning of transmissionand disconnect ID is send on end of transmission.Off : Sending ID function is disabled.There is also “PTT ID” setting for each channel. Refer“PTT ID” of channel feature.When you use an ID code for ANI board, the ID code andtransmitting timing are configured to the optional ANI board.3-17. OST (Operator Selectable Tone)The transceiver is capable to have “OST” function and16 tone pair (QT/DQT) with max 7-digit name for each tonepair.“OST” Back UpThe transceiver is programmable the selected “OST”code is memorized or not. If you set to Disable (no
