DOWNLOAD Panasonic KX-TG7125RUS / KX-TG7125RUT / KX-TGA711RUS / KX-TGA711RUT Service Manual ↓ Size: 2.37 MB | Pages: 98 in PDF or view online for FREE

45

(M)

Sensitivity Receiver 

Confirmation

-

Follow steps 1 to 6 of (I).

7.Set DECT tester power to -90 dBm.
8.Confirm that the BER is < 1000 ppm.

IC7, IC10, L7, 

L3, L4, L6, 

C117, C118, 

C119, C120, 
C124, C125, 
R106, R109, 

DA1, C102, 

R102, R103, 

Q10, C110, 

C112, R111, 

C126, C127, 

R112

(N)

Timing Confirmation

-

Follow steps 1 to 6 of (I).

7.Confirm that the Timing accuracy is < ± 2.0 ppm.

IC7, IC10, L7, 

L3, L4, L6, 

C117, C118, 

C119, C120, 
C124, C125, 
R106, R109, 

DA1, C102, 

R102, R103, 

Q10, C110, 

C112, R111, 

C126, C127, 

R112

(O)* RSSI Level Confirmation

-

Follow steps 1 to 6 of (I).

7.Execute the command “readrssi”.
8. Confirm that the returned value is 22 ± A (hex).

IC7, IC10, L7, 

L3, L4, L6, 

C117, C118, 

C119, C120, 
C124, C125, 
R106, R109, 

DA1, C102, 

R102, R103, 

Q10, C110, 

C112, R111, 

C126, C127, 

R112

(P) Power RAMP Confirma-

tion

-

Follow steps 1 to 6 of (I).

7.Confirm that Power RAMP is matching.

IC7, IC10, L7, 

L3, L4, L6, 

C117, C118, 

C119, C120, 
C124, C125, 
R106, R109, 

DA1, C102, 

R102, R103, 

Q10, C110, 

C112, R111, 

C126, C127, 

R112

(Q)*

Audio Check

-

1. Link with Handset.
2. Input -45dBm/1kHz to MIC of Handset.

Measure the Level at Line I/F and distortion level.

3. Confirm that the level is -10 dBm ± 2 dBm and that the distortion level is < 5%

at TEL Line (600 

Ω Load).

4. Input -20 dBm/1 kHz to Line I/F.

Measure the level at Receiver of Handset and distortion level
(*Receive volume set to second position from minimum). 

5. Confirm that the level is -21 dBm ± 2 dBm and that the distortion level is < 5%

at Receiver (Volume Middle, 150 

Ω Load).

IC7, CN1, SA1, 
L1, L2, D3, Q3, 

Q4, R14, R15, 

R16, R17

(R)

Charging Check

-

1. Connect Charge Contact 12 

Ω/2 W resistor between charge+ and charge-.

2. Measure and confirm voltage across the resistor is 3.10 V ± 0.2 V.

R55, R56, C48, 

C49

(S)

TAM Operation 

Confirmation

-

1. TAM Confirmation (Execute the command “sendchar_VPI”)
2. Confirm the returned Value (Value is “D897RN”).

IC8, IC9, R89, 

R91, R92

Items

Check 

Point

Procedure

Check or 

Replace Parts

46

After the measuring, suck up the solder of TP.
The connection of adjustment equipment is as shown in Adjustment Standard (Charger Unit) (P.61).

Items

Check 

Point

Procedure

Check or 

Replace Parts

(A)

Charging Check

-

1. Connect Charge Contact 12 

Ω/2 W resistor between charge+ and charge-.

2. Measure and confirm voltage across the resistor is 3.3 V ± 0.2 V.

R2, R1 
R3, R4

47

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.47)

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

After the measuring, suck up the solder of TP.
*: PC Setting (P.63) is required beforehand.
The connections of adjustment equipments are as shown in Adjustment Standard (Handset) (P.64).

Items

Check 

Point

Procedure

Check or 

Replace Parts

(A)* 1.8 V Supply Adjustment

VDD1

1. Confirm that the voltage between test point VDD1 and GND is 1.8 V ± 0.02 V.
2. Execute the command “bandgap”, then check the current value.
3. Adjust the 1.8V voltage of VDD1 executing command “bandgap XX“(XX is the

value).

IC1, Q2, C10

(B)

DC/DC Supply Confir-

mation

VDD3

1. Confirm that the voltage between test point VDD3 and GND is 3.3 V ± 0.3 V

(Backlight is ON).

IC1, F1, C1, 

C2, C3, R1, 

Q1, D1, L1

(C) 2.5 V Supply Confirma-

tion

VDD2

1. Confirm that the voltage between test point VDD2 and GND is 2.5 V ± 0.1 V.

IC1, Q3, C5

(D)*

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.

IC1, X1, C6, 

C7, R19

(E)* EEP-ROM Confirmation

-

1. EEP-ROM Confirmation (Execute the command “ChkTGA711XXrevYY”).

XX: country code
YY: revision number

2. Confirm the returned checksum value.

“XX”, “YY”, and “checksum” vary depending on the country version. You can find
them in the batch file, PQZZ- mentioned in JIG and PC (P.58).

IC1, IC3, R40, 

R41, R42, 
Q10, Q11, 
R43, R44,

C37

(F) Charge Control Check & 

Charge Current Monitor 

Check

-

1. Apply 3.5 V between J3(+) and J4(-) with DC power supply and set current limit

to 250 mA.

2. Confirm that the current limit LED of DC power supply is ON/OFF.
3. Decrease current limit of DC power supply to 100mA.
4. Confirm that the current limit LED of DC power supply is stable. (Current limiter

is ON.)

(If charge control cannot be confirmed by this procedure, please use battery to hand-
set power supply and try again.)

IC1, Q4, Q5, 

Q9, D6, D7, 

D8, L4, 

L5, R5, R6, 

R7, R8, F1

48

(G)* Charge Detection (OFF) 

Check

-

1. Stop supplying 3.5 V to J3 CHARGE(+) and J4 CHARGE(-).
2. Execute the command “Backloff” then “charge”.
3. Confirm that the returned value is 00 (hex).

IC1, Q4, Q5, 

Q9, D6, D7, 

D8, L4, 

L5, R5, R6, 

R7, R8, F1

(H)* Battery Monitor Check

-

1. Apply 2.25 V between BATT and GND.
2. Execute the command “readbatt”.

It assumes that the return value is XX.
a) 1E   XX   2C: No need to adjust
b) XX: 18 ~ 1D: Need to adjust
XX: 2D ~ 32: Need to adjust
Write AD value of 2.25V to EEPROM.
ex) read data: XX = 1D, write data: YY = 1D
read data: XX = 2D, write data: YY = 2D
EEPROM = 0004(Low Voltage) write “YY”
Execute the command “wreeprom 00 04 01 YY”.
EEPROM = 0005(No Voltage) write “YY - 1D”
Execute the command “wreeprom 00 05 01 ZZ”.
EEPROM = 000A(Low Voltage BL) write “YY - 16”
Execute the command “wreeprom 00 0A 01 WW”.

ZZ = YY - 1D, WW = YY - 16

No Voltage writing data limit is ‘00’.
c) XX: 00 ~ 17: Reject
XX: 33 ~ FF: Reject

IC1, F1, C1 

C3, R12

(I)

Battery Low Confirma-

tion

-

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

IC1, F1, C1 

C3, R12

(J)* BBIC Clock Adjustment

CLK

1. Apply 2.6 V between BATTERY(+) and BATTERY(-) with DC power.
2. Execute the command “conttx”.
3. Input Command “rdeeprom 00 01 01”, then you can confirm the current value.
4. Adjust the frequency of CLK executing the command “setfreq xx (where xx is

the value)” so that the reading of the frequency counter is 10.368000 MHz ± 10
Hz.

Note:

CLK is displayed only for a few seconds when executing the command “conttx”
after battery is inserted.

IC1, X1, C6, 

C7, R19, 
IC4, C57

(K)* Transmitted Power Con-

firmation

-

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

2. Execute the command “regcmd60 01 02 03 04 05".
3. Initiate connection from DECT tester.
4. Confirm that the NTP value at A201 is   19 dBm ~ 25 dBm.

IC1, IC4, C66,

C58, C57, 
C50, C52, 

C53, 

R52, C60,

C61

(L)* Modulation Check and 

Adjustment

-

Follow steps 1 to 3 of (K) above.

4.Confirm that the B-Field Modulation is -350 ~ -400/+320 ~ +370 kHz/div using
data type Fig 31.
5.Adjust the B-Field Modulation if required. (Execute the command “Readmod”
and “wrtmod xx”, where xx is the value.)

IC1, IC4, C66,

C58, C57, 
C50, C52, 

C53, 

R52, C60,

C61

(M) Frequency Offset Confir-

mation

-

Follow steps 1 to 3 of (K) above.

4.Confirm that the frequency Offset is < ± 45 kHz.

IC1, IC4, C66,

C58, C57, 
C50, C52, 

C53, 

R52, C60,

C61

(N) Frequency Drift Confir-

mation

-

Follow steps 1 to 3 of (K).

4.Confirm that the frequency Drift is < ± 30 kHz/ms.

IC1, IC4, C66,

C58, C57, 
C50, C52, 

C53, 

R52, C60,

C61

Items

Check 

Point

Procedure

Check or 

Replace Parts