KX-TG6541RUB, KX-TGA651RUB, KX-TGA405RUB - Panasonic Telephone Service Manual (repair manual). Page 46

46

(K)* Frequency Offset Confir-

mation

-

Follow steps 1 to 3 of (I).

4.Confirm that the frequency Offset is < ± 50 kHz.

IC1, 

C802~C806, 
C808~C814, 
C819~C820, 

C822, 

C825~C827, 

C834, 

C860~C864, 

L801~L804, 

DA801, 

R801~R808

(L)* Frequency Drift Confir-

mation

-

Follow steps 1 to 3 of (I).

4.Confirm that the frequency Drift is < ± 35 kHz/ms.

IC1, 

C802~C806, 
C808~C814, 
C819~C820, 

C822, 

C825~C827, 

C834, 

C860~C864, 

L801~L804, 

DA801, 

R801~R808

(M)*

Sensitivity Receiver 

Confirmation

-

Follow steps 1 to 3 of (I).

4.Set DECT tester power to -88 dBm.
5.Confirm that the BER is < 1000 ppm.

IC1, 

C802~C806, 
C808~C814, 
C819~C820, 

C822, 

C825~C827, 

C834, 

C860~C864, 

L801~L804, 

DA801, 

R801~R808

(N)* Power RAMP Confirma-

tion

-

Follow steps 1 to 3 of (I).

4.Confirm that Power RAMP is matching.

IC1, 

C802~C806, 
C808~C814, 
C819~C820, 

C822, 

C825~C827, 

C834, 

C860~C864, 

L801~L804, 

DA801, 

R801~R808

(O) Audio Check and Confir-

mation

-

1. Link to BASE which is connected to Line Simulator.
2. Set line voltage to 48 V and line current to 40 mA.
3. Input -45 dBm/1KHz to MIC and measure Line output level.
4. Confirm that the level is -2.5 dBm ± 2 dBm and that the distortion level is < 5%

at TEL Line (600 

Ω Load).

5. Input -20 dBm/1KHz to Line I/F and measure Receiving level at REV+ and

REV-.

6. Confirm that the level is -23 dBm ± 2 dBm and that the distortion level is < 5%

at Receiver. (vol = 2)

IC1, C12, C96, 

C97, R215, 

R27, RA4, 

C11, C13, 

R28, D3, D4, 

MIC, R73, R74

(P) SP phone Audio Check 

and Confirmation

-

1. Link to Base which is connected to Line Simulator.
2. Set line voltage to 48 V and line current to 50 mA.
3. Set the handset off-hook using SP-Phone key.
4. Input -2.5dBm (600 

Ω)/1KHz to Line I/F and measure Receiving level at SP+

and SP-.

5. Confirm that the level is -15 dBm ± 2 dBm and that the distortion level is < 5%.

(vol = 3)

IC1, C12, C73, 

D13, D14, 
R73, R74, 

MIC, C11, 

C13, RA4, 

R27, R28, 
C96, C97, 

R215, C72

(Q) Charge Pump 3.0V Sup-

ply Confirmation

CP3.0V

1. Confirm that the voltage between testpoint CP3.0V and GND is 3.0V -0.1/

+0.3V.

C49, C52~C54

(R) Charge Pump 4.0V Sup-

ply Confirmation

CP4.0V

1. Confirm that the voltage between testpoint CP4.0V and GND is 4.0V -0.2V.

C50, C51, 

C55

Items

Check 

Point

Procedure

Check or 

Replace Parts