KX-TG8051RUB, KX-TG8051RUW, KX-TG8051RU1, KX-TG8051UAB, KX-TG8051CAB, KX-TG8052RUB, KX-TG8052RUW, KX-TGA806RUB, KX-TGA806RUW, KX-TGA806RU1 - Panasonic Telephone Service Manual Supplement (repair manual). Page 15

15

(E)* Charge Detection (OFF) 

Check

-

1. Stop supplying 5.0 V to CHG (+) and CHG (-).
2. Confirm the indication of “charging” has been cleared.

IC1, Q4 Q9, 
Q5, Q6, R9, 

R4, R5, R33, 

C19, F1, C1, 

R30, R31, R8, 

R45

(F)* Battery Monitor Check

-

1. Apply 2.25 V between BATT+ and BATT-.
2. Execute the command 

sendchar PAD
sendchar LED 0
sendchar CRX 0 1
sendchar AD1
It assumes that the return value is XX.
a) 6c   XX   71: No need to adjust
b) XX: 6A ~ 6B: Need to adjust
XX: 72 ~ 74: Need to adjust
Write AD value of 2.25 V to EEPROM.
ex) read data: XX = 6A, write data: YY = 6A
read data: XX = 73, write data: YY = 73
EEPROM = 0009(Low Voltage) write “YY”
Execute the command “wreeprom 00 09 01 YY”.
EEPROM = 000A(No Voltage) write “YY -C”
Execute the command “wreeprom 00 0A 01 ZZ”.

ZZ = YY - C

No Voltage writing data limit is ‘00’.
c) XX: 00 ~ 69: Reject
XX: 75 ~ FF: Reject

IC1, F1, C1, 

R45

(G)

Battery Low 

Confirmation

-

1. Apply 2.40 V between BATT+ and BATT-.
2. Confirm that there is no flashing of Battery Icon.
3. Apply 2.25 V ± 0.08 V between BATT+ and BATT-.
4. Confirm that there is flashing of Battery Icon.

IC1, F1, C1, 

R45

(H)* BBIC Clock Adjustment

CLK

1. Apply 2.6 V between BATT+ and BATT- with DC power.
2. Input Command “sendchar sfr”, then you can confirm the current value.
3. Check X’tal Frequency. (10.368 MHz ± 20 Hz).
4. If the frequency is not 10.368 MHz ± 20 Hz, adjust the frequency of CLK

executing the command “sendchar sfr xx xx (where xx is the value)” so that the
reading of the frequency counter is 10.368000 MHz ± 5 Hz.

Note:

Clear the registered information for Base Unit before measurement, because the
Frequency will not possibly get stable due to the registered information.
Pressing the button of "3" "5" "7" "#"clears the registration.
Register to it on Base Unit after measurement. 

IC1, X1, C47

 

(I)*

Transmitted Power 

Confirmation

-

Remove the Antenna before starting step from 1 to 4.

1. Configure the DECT tester (CMD60) as follows;

<Setting>

• Test mode: PP
• RFPI: 0102030405
• Traffic Carrier: 5
• Traffic Slot: 4
• Mode: Loopback
• RF LEVEL = -70 dBm
• PACKET: PP32Z

2. Execute the command “sendchar TST 01 02 03 04 05".
3. Initiate connection from DECT tester.
4. Confirm that the NTP value at ANT is 19 dBm ~ 25 dBm.

IC1, 

C802~C803, 
C805, C806, 

C810, L809, 

C811, C814,  

R806, C825, 

DA801

(J)* Modulation Check and 

Adjustment

-

Follow steps 1 to 3 of (K).

4.Confirm that the B-Field Modulation is -350±50/ +350±50 kHz/div & Modulated
width   610 kHz using data type Fig 31.

IC1

(K)*

Frequency Offset 

Confirmation

-

Follow steps 1 to 3 of (I).

4.Confirm that the frequency Offset is < ± 20 kHz.

IC1

(L)*

Frequency Drift 

Confirmation

-

Follow steps 1 to 3 of (I).

4.Confirm that the frequency Drift is < ± 20 kHz/ms.

IC1

(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~C804, 
C826, C837, 
C820, C822,  

DA801, R807

(N)*

Power RAMP 

Confirmation

-

Follow steps 1 to 3 of (I).

4.Confirm that Power RAMP is matching.

IC1

Items

Check 

Point

Procedure

Check or 

Replace Parts