DOWNLOAD Panasonic KX-TG2511RUM / KX-TG2511RUN / KX-TG2511RUS / KX-TG2511RUT / KX-TG2512RUN / KX-TG2512RUS / KX-TG2521RUT / KX-TGA250RUM / KX-TGA250RUN / KX-TGA250RUS / KX-TGA250RUT Service Manual ↓ Size: 3.56 MB | Pages: 83 in PDF or view online for FREE

41

If your unit has below symptoms, follow the instructions in remedy column. Remedies depend on whether you have DECT tester
(*1) or not. 

(*1) A general repair is possible even if you don’t have the DECT tester because it is for confirming the levels, such as Acoustic
level in detail.
(*2) Refer to Check Point (Handset) (P.41)

Please follow the items below when BBIC or EEPROM is replaced.

After the measuring, suck up the solder of TP.
*: Connections (P.53) is required beforehand.
The connections of adjustment equipment are as shown in Adjustment Standard (Handset)

Symptom

Remedy (*2)

You don’t have DECT Tester.

You have DECT Tester. 

(Model Number: CMD60)

Battery strength is not indicated correctly by Battery icon.

Check item (A) - (D), (E) - (G).

Check item (A) - (D), (E) - (G).

You cannot hear the caller’s voice.

Check item (A) - (C), (H), (N).

Check item (A) - (C), (H - (L)) - (N). 

You cannot use handset little away from base unit even if the
handset is within range of the base unit.

-

Check item (I) - (M).

the Audio level is high or low.

Check item (N).

Check item (N).

The SP-Phone level is high or low.

Check item (O).

Check item (O).

Items

Check 

Point

Procedure

Check or 

Replace Parts

(A)* 1.8 V Supply Adjustment

1.8V

1.Confirm that the voltage between test point 1.8V and GND is 1.8 V ± 0.02 V.

2.Execute the command “VDD”, then check the current value.

3.Adjust the 1.8V voltage of 1.8V executing command “VDD XX“(XX is the 

value).

IC5, Q2, C1, 

C44, R45, 

C40, C45, F1

(B)*

BBIC Confirmation

-

1.BBIC Confirmation (Execute the command “getchk”).

2.Confirm the returned checksum value.

Connection of checksum value and program number is shown below.

IC5, X1

(C)* EEP-ROM Confirmation

-

1.EEP-ROM Confirmation (Execute the command "sendchar EPV").

2.Confirm the returned Value. (Value for reference is written at "EEPROM C/

SUM” in Software_Version_Table.xls).

IC5, IC3, 

RA40, C172

(D) Charge Control Check & 

Charge Current Monitor 

Check

-

1.Apply 5.0 V between CHG(+) and CHG(-) with DC power supply and set cur-

rent limit to 150 mA.

Confirm the indication of “charging” on LCD.

2.Confirm that the current limit LED of DC power supply is ON/OFF.

Confirm it after waiting over 1 minute at least.

(If charge control cannot be confirmed by this procedure, please use battery to hand-

set power supply and try again.)

IC5, Q4, Q9, 

Q6, R7, R30, 

R8, F1, C1,

R45, C5, C35, 

C150

(E)* Charge Detection (OFF) 

Check

-

1.Stop supplying 5.0 V to CHG (+) and CHG (-).

2.Confirm the indication of “charging” has been cleared.

Refer to (D)

1CF8

DBW2RP

ex.)

checksum value

program number

42

(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) XX: 70: No need to adjust
b) XX: 66 ~ 6F: Need to adjust
XX: 71 ~ 7A: 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

c) XX: 00 ~ 65: Reject
XX: 7B ~ FF: Reject

IC5, 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.

IC5, F1, C1, 

R45

(H)* BBIC Clock Adjustment

CKM

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 ± 100 Hz).
4. If the frequency is not 10.368 MHz ± 100 Hz, adjust the frequency of CKM exe-

cuting 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. 

IC5, X1, C47

 

(I)*

Transmitted Power 

Confirmation

-

Short Ant-Short to Ant-Short-GND.

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 ~ 24 dBm.

IC5, C801, 

C859, C860, 

C861, C862

(J)*

Modulation Check and 

Adjustment

-

Follow steps 1 to 3 of (I).

4.Confirm that the B-Field Modulation is -350 ± 50/+350 ± 50 kHz/div using data 

type Fig 31.

Refer to (I)

(K)*

Frequency Offset 

Confirmation

-

Follow steps 1 to 3 of (I).

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

Refer to (I)

(L)*

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.

Refer to (I)

(M)*

Power RAMP 

Confirmation

-

Follow steps 1 to 3 of (I).

4.Confirm that Power RAMP is matching.

Refer to (I)

(N)

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. Input -45 dBm (600 

)/1 kHz to MIC of Handset. Measure the Level at Line I/F

and distortion level.

4. Confirm that the level is -1.5 dBm ± 5 dB and that the distortion level is < 5 %

at TEL Line (600 

 Load).

5. Input -20 dBm (600 

)/1 kHz to Line I/F. Measure the Level at Receiver of

Handset and distortion level (Receive volume set to second position from mini-
mum).

6. Confirm that the level is -26.0 dBm ± 4 dB and that the distortion level is < 5 %

at Receiver (34 

 Load).

IC5, C14, R27, 

R23, C11, 

C13, R28, MIC

Items

Check 

Point

Procedure

Check or 

Replace Parts

43

(O)

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 -30 dBm (600 

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

and SP-.

5. Confirm that the level is -14 dBm ± 3 dB and that the distortion level is < 5 %. 

(vol = Max at SP (8 

 Load))

IC5, C14, D13, 

D14, MIC, 

C11, C13, 

R23, R27, R28

(P)

Charge Pump 3.0 V 

Supply Confirmation

CP3V

1. Confirm that the voltage between testpoint CP3.0V and GND is 3.0 V ± 0.3 V.

C49, C52, C54

(Q)

Charge Pump CP_LED 

3.0V Supply Confirma-

tion

CP_LED

1. Confirm that the voltage between testpoint CP_LED and GND is 3.0 V ± 0.3 V.

(Power is supplied when LED in on)

C51, C55 

Items

Check 

Point

Procedure

Check or 

Replace Parts

44

When the customer’s telephone line corresponds to the following conditions, and the transmission signal of SP-Phone is inter-
rupted, performing the next set up to a cordless handset will improve it to some extent.
Conditions

1. When customer’s line has less line loss.

ex.) The customer is using optical fiber, ISDN terminal adaptor, or PBX.
In this case, receiving signal is strong and it may affect transmission signal.

2. When the other party is talking from noisy place.

ex.) The other party is using cellular phone. The background noise is very loud.
In this case, the noise from the other party (i.e. surrounding noise) may affect transmission signal.

* Do not enter New Value if the Default Value is different from the table above.

(*1) Refer to Handset (P.22) of Engineering Mode to enter the Address or New Data. 

TGA251

TX 6dB Louder

02 C9

02 CA

F5
32

8A

19

TX 12dB Louder

02 C9

02 CA

F5
32

C0
0C

TX 6dB Lower

02 C9

02 CA

F5
32

AC

65