Kenwood-THK-2-Service-Manual电路原理图.pdf
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1、144MHz FM TRANSCEIVERTH-K2AT/K2E/K2ET 2003-8 PRINTED IN JAPANB51-8658-00 (S) 836SERVICE MANUALDISASSEMBLY FOR REPAIR . 2CIRCUIT DESCRIPTION . 6SEMICONDUCTOR DATA . 14COMPONENTS DESCRIPTION . 15PARTS LIST . 17EXPLODED VIEW. 23PACKING . 25ADJUSTMENT . 27TERMINAL FUNCTION . 43PC BOARDTX-RX UNIT (X57-67
2、4X-XX) (A/3) . 44TX-RX UNIT (X57-674X-XX) (B/3),(C/3) . 48CONTENTSSCHEMATIC DIAGRAM. 50LEVEL DIAGRAM . 55BLOCK DIAGRAM . 56BC-21 (WALL CHARGER) . 58PB-43N (Ni-MH BATTERY PACK) . 58BT-14 (BATTERY CASE) . 59PG-4Y (PROGRAMMING INTERFACE CABLE) . 59MCP-1A (MEMORY CONTROL PROGRAM) . 59SPECIFICATIONS . BA
3、CK COVERKnob (ENC)(K29-5159-03)Knob (VOL)(K29-5150-03)Cabinet assy(16key)(A02-3819-23)Helical Antenna(T90-1018-25)Key top (16key)(K29-9272-02)Front glass(B10-2746-03)Knob(PTT/LAMP/MON)(K29-9274-03)Knob (ENC)(K29-5159-03)Knob (VOL)(K29-5150-03)Cabinet assy(4key)(A02-3818-23)Helical Antenna(T90-1018-2
4、5)Key top (4key)(K29-9276-02)Front glass(B10-2746-03)Knob(PTT/LAMP/MON)(K29-9274-03)TH-K2AT/K2ET TH-K2ECap(SP/MIC/DC IN)(B09-0675-03)Cap(SP/MIC/DC IN)(B09-0675-03)TH-K2AT/K2E/K2ET2DISASSEMBLY FOR REPAIRHow to remove the case assembly from thechassis1. Remove two screws (z) holding the chassis.2. Pul
5、l out two knobs (x) and remove two round nuts (c).3. Pull out the SP and MIC parts of the cap from jacks (v).4. Turn the unit over with the bottom of the chassis facingupwards, and remove the chassis (n) from the caseassembly (b).5. Remove the speaker lead (m) from the connector (CN2) ofthe TX-RX PC
6、 board (TX-RX unit A/3).How to remove the PC board Numeric key PC board (TX-RX unit B/3)1. Remove three screws (,) on the numeric key PC board.2. Lift the numeric key PC board and remove it from theconnector (CN9) of the TX-RX PC board (.). PTT PC board (TX-RX unit C/3)3. Remove one screw on the PTT
7、 PC board (/).4. Pull the PTT PC board to the left and remove it from theconnector (CN6) of the TX-RX PC board (TX-RX unit A/3)(). TX-RX PC board (TX-RX unit A/3)5. Remove the SP/MIC jack cover ().6. Remove two screws () holding the shieldcover (antenna terminal section).7. Remove two screws () hold
8、ing the shieldcover (final amplifier section).8. Remove eight screws () on the TX-RX PCboard.9. Absorb solder from the antenna terminal ()with a solder absorber.Note: Do not melt the shadow plate () whenmoving the tip of the solder absorber closeto the antenna terminal.10. Remove the TX-RX PC board
9、from the chassis, then removethe encoder volume FPC () from the flat cable connectorof the TX-RX PC board.CN2CN9CN6xxccvmb,./nzTX-RX unit (B/3)TX-RX unit (C/3)TX-RX unit (A/3)TH-K2AT/K2E/K2ET3DISASSEMBLY FOR REPAIRSoldering the antenna terminal1. With the shield cover removed from the antenna termin
10、alsection, install two screws on the PC board and bring thePC board into contact with the chassis (z).2. Solder the antenna terminal with a soldering iron (x).3. Remove the two screws installed in step 1 above, and installthe two screws again on the PC board together with theshield cover (c).Replaci
11、ng the final FET (Q12)1. Remove the two screws holding the shield cover of thefinal FET section (z).2. Remove solder from the shield cover completely with asolder absorber. (E and E3 types only)3. Remove the shield cover (x).zxczx4. Apply the tips of soldering irons to all the four pins of the final
12、FET at the same time (c), heat them sufficiently, and removethe final FET (v). (Two persons should be required to do this.)5. Remove all PC boards from the chassis.6. Confirm that there is no space between the radiation plateinstalled on the foil side of the TX-RX PC board (TX-RX unitA/3) and the PC
13、 board (b). If there is any space betweenthe radiation plate and PC board, eliminate it by applyingthe tip of the soldering iron to the radiation plate.7. Apply the tip of the soldering iron to the installation side of theradiation plate of the TX-RX PC board, put a little amount ofsolder to the rad
14、iation plate that is seen through a square holein the final FET installation section and melt the solder (n).8. When the solder in step 7 is melted, place the final FET onthe PC board by aligning it with the silk of the final FETinstallation section of the PC board (m).9. Release the soldering iron
15、and confirm that the final FETand radiation plate have been soldered.10. Solder the four pins of the final FET with the soldering iron.11. Install all the PC boards.12. Reinstall the shield cover removed in step 3 above in itsoriginal position and install two screws.13. Solder the shield cover to th
16、e PC board. (E and E3 typesonly)14. Install the chassis on the case assembly and assemble them.15. Readjust transmission power.Note: Since the FET is sensitive to static electricity, alwayswear a grounding band. Use a highly insulated ceramicheater solder iron.Radiation plateTX-RX PC boardbcvmnTH-K2
17、AT/K2E/K2ET4DISASSEMBLY FOR REPAIRSpecial care and attention required for assembly1. Gluing to the key top (MIC element section)You must also glue on the speaker storage area and heapthe glue up until wealthy glued on the speaker storage areaand the key top for waterproofing the MIC element side oft
18、he key top. (Fig. 1)Fig. 12. Bending the LCD hardware fixture (J21-8456-03) tabs(1)Insert the tabs of the LCD hardware fixture into four holesin the LCD installing position of the TX-RX PCB (TX-RX unitA/3). (Fig. 2)Heap the glue up until wealthy glued on the speakerstorage area and the key top (MIC
19、element section).Fig. 2(2)By pressing the LCD hardware fixture from the componentside of the TX-RX PCB, you must bent all 4 tabs of the LCDhardware fixture being visible from the foil side until thebases of each tabs are folded at least 45 degrees (Fig. 3). Ifthe bending angle of the tabs of the LCD
20、 hardware fixtureis less than 45 degrees, a display error may occur.Bending positionNGNGMin 45degrees3. PTT PCB (TX-RX unit C/3) installation procedureInstalling the PTT PCB on the TX-RX PCB and chassis areas follows:(1)Insert the PTT PCB connector (CN7) into the TX-RX PCBconnector (CN6) lightly.(2)
21、Push three parts of the PTT PCB to contact tightly with thechassis. There may be a small gap between the connectors.(Fig. 4)Note: A double-side adhesive tape (J99-0376-04) is usedbehind the PTT switch. When reassembling the PTTPCB to the chassis, press the PTT PCB (under the PTTswitch) so that the t
22、ape hold the PCB and chassissecurely.Fig. 3CN6ChassisPTT switchPTT PCB (C/3)OKA bitclearanceNoclearanceNGCN6CN7CN7ChassisPTT PCB (C/3)PTT switchFig. 4Push three parts of the PTT PCBto contact tightly with the chassis.(3)Tighten one screw in the PTT PCB.TH-K2AT/K2E/K2ET5DISASSEMBLY FOR REPAIR4. Packi
23、ng (G53-1572-02) TX/BUSY lamp installationprocedure(1)To assure waterproofing, install the packing in the chassisgroove as shown in Fig. 5. (z)(2)Install the packing TX/BUSY lamp section on the chassis.(x)zxOKPackingNGPackingChassisChassis5. Packing (G53-1572-02) bottom installation procedure(1)Befo
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