KENWOOD THK2AT Service Manual

KENWOOD THK2AT Service Manual
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Service Manual for KENWOOD THK2AT, downloadable as a PDF file.

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File size: 1.92 MB
Available language versions: English
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Sample pages

144MHz FM TRANSCEIVER

TH-K2AT/K2E/K2ET

B51-8658-00 (S) 836

SERVICE MANUAL

DISASSEMBLY FOR REPAIR ................................... 2

CIRCUIT DESCRIPTION ............................................ 6

SEMICONDUCTOR DATA ...................................... 14

COMPONENTS DESCRIPTION .............................. 15

PARTS LIST ............................................................. 17

EXPLODED VIEW .................................................... 23

PACKING ................................................................. 25

ADJUSTMENT ........................................................ 27

TERMINAL FUNCTION ........................................... 43

PC BOARD

TX-RX UNIT (X57-674X-XX) (A/3) ................... 44

TX-RX UNIT (X57-674X-XX) (B/3),(C/3) .......... 48

CONTENTS

SCHEMATIC DIAGRAM .......................................... 50

LEVEL DIAGRAM .................................................... 55

BLOCK DIAGRAM ................................................... 56

BC-21 (WALL CHARGER) ....................................... 58

PB-43N (Ni-MH BATTERY PACK) .......................... 58

BT-14 (BATTERY CASE) ......................................... 59

PG-4Y (PROGRAMMING INTERFACE CABLE) ..... 59

MCP-1A (MEMORY CONTROL PROGRAM) ......... 59

SPECIFICATIONS ................................. BACK COVER

Knob (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

(T90-1018-25)

Key top (4key)

(K29-9276-02)

Front glass

(B10-2746-03)

Knob

(PTT/LAMP/MON)

(K29-9274-03)

TH-K2AT/K2ET

TH-K2E

Cap

(SP/MIC/DC IN)

(B09-0675-03)

Cap

(SP/MIC/DC IN)

(B09-0675-03)

144MHz FM TRANSCEIVER

TH-K2AT/K2E/K2ET

B51-8658-00 (S) 836

SERVICE MANUAL

DISASSEMBLY FOR REPAIR ................................... 2

CIRCUIT DESCRIPTION ............................................ 6

SEMICONDUCTOR DATA ...................................... 14

COMPONENTS DESCRIPTION .............................. 15

PARTS LIST ............................................................. 17

EXPLODED VIEW .................................................... 23

PACKING ................................................................. 25

ADJUSTMENT ........................................................ 27

TERMINAL FUNCTION ........................................... 43

PC BOARD

TX-RX UNIT (X57-674X-XX) (A/3) ................... 44

TX-RX UNIT (X57-674X-XX) (B/3),(C/3) .......... 48

CONTENTS

SCHEMATIC DIAGRAM .......................................... 50

LEVEL DIAGRAM .................................................... 55

BLOCK DIAGRAM ................................................... 56

BC-21 (WALL CHARGER) ....................................... 58

PB-43N (Ni-MH BATTERY PACK) .......................... 58

BT-14 (BATTERY CASE) ......................................... 59

PG-4Y (PROGRAMMING INTERFACE CABLE) ..... 59

MCP-1A (MEMORY CONTROL PROGRAM) ......... 59

SPECIFICATIONS ................................. BACK COVER

Knob (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

(T90-1018-25)

Key top (4key)

(K29-9276-02)

Front glass

(B10-2746-03)

Knob

(PTT/LAMP/MON)

(K29-9274-03)

TH-K2AT/K2ET

TH-K2E

Cap

(SP/MIC/DC IN)

(B09-0675-03)

Cap

(SP/MIC/DC IN)

(B09-0675-03)

TH-K2AT/K2E/K2ET

DISASSEMBLY FOR REPAIR

How to remove the case assembly from the

chassis

1. Remove two screws (z) holding the chassis.

2. Pull 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 facing

upwards, and remove the chassis (n) from the case

assembly (b).

5. Remove the speaker lead (m) from the connector (CN2) of

the TX-RX PC 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 the

connector (CN9) of the TX-RX PC board (.).

PTT PC board (TX-RX unit C/3)

3. Remove one screw on the PTT PC board (/).

4. Pull the PTT PC board to the left and remove it from the

connector (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 (ç) holding the shield

cover (antenna terminal section).

7. Remove two screws () holding the shield

cover (final amplifier section).

8. Remove eight screws () on the TX-RX PC

board.

9. Absorb solder from the antenna terminal (~)

with a solder absorber.

Note: Do not melt the shadow plate (µ) when

moving the tip of the solder absorber close

to the antenna terminal.

10. Remove the TX-RX PC board from the chassis, then remove

the encoder volume FPC () from the flat cable connector

of the TX-RX PC board.

CN2

CN9

CN6

TX-RX unit (B/3)

TX-RX unit (C/3)

TX-RX unit (A/3)

TH-K2AT/K2E/K2ET

DISASSEMBLY FOR REPAIR

Soldering the antenna terminal

1. With the shield cover removed from the antenna terminal

section, install two screws on the PC board and bring the

PC 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 install

the two screws again on the PC board together with the

shield cover (c).

Replacing the final FET (Q12)

1. Remove the two screws holding the shield cover of the

final FET section (z).

2. Remove solder from the shield cover completely with a

solder absorber. (E and E3 types only)

3. Remove the shield cover (x).

4. Apply the tips of soldering irons to all the four pins of the final

FET at the same time (c), heat them sufficiently, and remove

the 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 plate

installed on the foil side of the TX-RX PC board (TX-RX unit

A/3) and the PC board (b). If there is any space between

the radiation plate and PC board, eliminate it by applying

the tip of the soldering iron to the radiation plate.

7. Apply the tip of the soldering iron to the installation side of the

radiation plate of the TX-RX PC board, put a little amount of

solder to the radiation plate that is seen through a square hole

in the final FET installation section and melt the solder (n).

8. When the solder in step 7 is melted, place the final FET on

the PC board by aligning it with the silk of the final FET

installation section of the PC board (m).

9. Release the soldering iron and confirm that the final FET

and 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 its

original position and install two screws.

13. Solder the shield cover to the PC board. (E and E3 types

only)

14. Install the chassis on the case assembly and assemble them.

15. Readjust transmission power.

Note: Since the FET is sensitive to static electricity, always

wear a grounding band. Use a highly insulated ceramic

heater solder iron.

Radiation plate

TX-RX PC board

TH-K2AT/K2E/K2ET

DISASSEMBLY FOR REPAIR

Special care and attention required for assembly

1. Gluing to the key top (MIC element section)

You must also glue on the speaker storage area and heap

the glue up until wealthy glued on the speaker storage area

and the key top for waterproofing the MIC element side of

the key top. (Fig. 1)

Fig. 1

2. Bending the LCD hardware fixture (J21-8456-03) tabs

(1) Insert the tabs of the LCD hardware fixture into four holes

in the LCD installing position of the TX-RX PCB (TX-RX unit

A/3). (Fig. 2)

Heap the glue up until wealthy glued on the speaker

storage area and the key top (MIC element section).

Fig. 2

(2) By pressing the LCD hardware fixture from the component

side of the TX-RX PCB, you must bent all 4 tabs of the LCD

hardware fixture being visible from the foil side until the

bases of each tabs are folded at least 45 degrees (Fig. 3). If

the bending angle of the tabs of the LCD hardware fixture

is less than 45 degrees, a display error may occur.

Bending position

Min 45

degrees

3. PTT PCB (TX-RX unit C/3) installation procedure

Installing the PTT PCB on the TX-RX PCB and chassis are

as follows:

(1) Insert the PTT PCB connector (CN7) into the TX-RX PCB

connector (CN6) lightly.

(2) Push three parts of the PTT PCB to contact tightly with the

chassis. There may be a small gap between the connectors.

(Fig. 4)

Note: A double-side adhesive tape (J99-0376-04) is used

behind the PTT switch. When reassembling the PTT

PCB to the chassis, press the PTT PCB (under the PTT

switch) so that the tape hold the PCB and chassis

securely.

Fig. 3

CN6

Chassis

PTT switch

PTT PCB (C/3)

A bit

clearance

CN6

CN7

Chassis

PTT PCB (C/3)

PTT switch

Fig. 4

Push three parts of the PTT PCB

to contact tightly with the chassis.

(3) Tighten one screw in the PTT PCB.

TH-K2AT/K2E/K2ET

DISASSEMBLY FOR REPAIR

4. Packing (G53-1572-02) TX/BUSY lamp installation

procedure

(1) To assure waterproofing, install the packing in the chassis

groove as shown in Fig. 5. (z)

(2)Install the packing TX/BUSY lamp section on the chassis.

(x)

Packing

Chassis

5. Packing (G53-1572-02) bottom installation procedure

(1) Before installing the numeric key PCB (TX-RX unit B/3) on

the chassis, push three parts of the packing to contact tightly

with the chassis as shown in Fig. 6. If the packing is not in

contact with the chassis, there may be a gap between the

transceiver bottom case assembly and the battery, and

water may enter through the gap.

Fig. 5

Push three parts of the packing to

contact tightly with the chassis.

Clearance NG

Fig. 6

6. Cautions for installing the chassis on the case assembly

(1) Verify that the packing (G53-1572-02) TX/BUSY lamp section

is has been past through the hole in the illumination guide

section on the top of the case assembly. (Fig. 7)

LAMP

LOW

PTT

Fig. 7

(2)Align the speaker lead as shown fig.8. Do not place the

leads over the key top section, LCD section or SP/MIC/DC

IN cap section.

Do not fix this part of the

key top to the rib of the

case assembly.

7. Cautions for installing the key top on the case assembly

(1) Install the key top keypad section and the power switch

section on the rib of the case assembly.

(2) Do not fix the part between the key top keypad section and

the power switch section to the rib of the case assembly,

but install it as shown in Fig. 8.

The packing TX/BUSY lamp section is has

been past through the hole in the illumination

guide section on the top of the case assembly.

Fig. 8

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