DOWNLOAD Panasonic KX-PRL260RUB / KX-PRLA20RUB Service Manual ↓ Size: 6.3 MB | Pages: 87 in PDF or view online for FREE

61

1. Prepare the digital voltmeter, and set the selector knob to ohm meter.
2. Put the probes at the speaker terminals as shown below.

Channel No. 10: In the Test Mode on Base Unit and Handset.

Receive Frequency

1

1897.344 1897.344 1897.344 1897.344 

2

1895.616 1895.616 1895.616 1895.616 

3

1893.888 1893.888 1893.888 1893.888 

4

1892.160 1892.160 1892.160 1892.160 

5

1890.432 1890.432 1890.432 1890.432 

6

1888.704 1888.704 1888.704 1888.704 

7

1886.976 1886.976 1886.976 1886.976 

8

1885.248

1885.248

1885.248

1885.248

9

1883.520 1883.520 1883.520 1883.520 

Handset speaker (receiver)

Digital Voltmeter

Is the value between
(+) terminal and (–) terminal about 40 

Ω?

RECEIVER:

Is the value between
(+) terminal and (–) terminal about 8 

Ω?

NG

NO

OK

YES

Replace the speaker 
(receiver).

SPEAKER:

62

Ch.

Frequency (MHz)

Ch.

Frequency (MHz)

Ch.

Frequency (MHz)

0

2402

33

2435

66

2468

1

2403

34

2436

67

2469

2

2404

35

2437

68

2470

3

2405

36

2438

69

2471

4

2406

37

2439

70

2472

5

2407

38

2440

71

2473

6

2408

39

2441

72

2474

7

2409

40

2442

73

2475

8

2410

41

2443

74

2476

9

2411

42

2444

75

2477

10

2412

43

2445

76

2478

11

2413

44

2446

77

2479

12

2414

45

2447

78

2480

13

2415

46

2448

14

2416

47

2449

15

2417

48

2450

16

2418

49

2451

17

2419

50

2452

18

2420

51

2453

19

2421

52

2454

20

2422

53

2455

21

2423

54

2456

22

2424

55

2457

23

2425

56

2458

24

2426

57

2459

25

2427

58

2460

26

2428

59

2461

27

2429

60

2462

28

2430

61

2463

29

2431

62

2464

30

2432

63

2465

31

2433

64

2466

32

2434

65

2467

63

This description only applies to the model with Shield case.

• PbF (: Pb free) Solder
• Soldering Iron

Tip Temperature of 700 

°F ± 20 °F (370 °C ± 10 °C)

Note:
We recommend a 30 to 40 Watt soldering iron. An expert may be able to use a 60 to 80 Watt iron where someone with less 
experience could overheat and damage the PCB foil.

• Hot Air Desoldering Tool

Temperature: 608 

°F ± 68 °F (320 °C ± 20 °C)

• To replace the IC efficiently, choose the right sized nozzle of the hot air desoldering tool that matches the IC package.
• Be careful about the temperature of the hot air desoldering tool not to damage the PCB and/or IC.

1. Heat the IC with a hot air desoldering tool through the P.C.Board.

2. Pick up the IC with tweezers, etc. when the solder is melted completely.

• Be careful not to touch the peripheral parts with tweezers, etc. They are unstable. 

When it is hard to melt the solder completely, heat it with a hot air desoldering tool through the IC besides through the
P.C.Board.

3. After removing the IC, clean the P.C.Board of residual solder.

P.C.Board

IC

Hot Air Desoldering Tool

Tweezers, etc.

P.C.Board

IC

P.C.Board

Hot Air Desoldering Tools

64

1. Place the solder a little on the land where the radiation GND pad on IC bottom is to be attached.

2. Place the solder a little on the land where IC pins are to be attached, then place the IC.

• When placing the IC, the positioning should be done very carefully.

3. Heat the IC with a hot air desoldering tool through the P.C.Board until the solder on IC bottom is melted.

• Be sure to place it precisely, controlling the air volume of the hot air desoldering tool.

4. After soldering, confirm there are no short and open circuits with visual inspection.

Solder

Soldering Iron

P.C.Board

Land

IC

Solder

Soldering Iron

P.C.Board

Land

P.C.Board

IC

Hot Air Desoldering Tool