KX-TGA915EXS - Panasonic Telephone Service Manual (repair manual). Page 22

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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 (USB Adaptor) (P.22)

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

After the measuring, suck up the solder of TP.
*: PC Setting (P.28) is required beforehand.
The connections of simulator equipments are as shown in Adjustment Standard (USB Adaptor) (P.30).

Items

Check 

Point

Procedure

Check or 

Replace Parts

(A)* 1.8 V Supply Adjustment

+1.8 V

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

the value).

Q2, C4, R26

(B) 3.2 V Supply Confirmation

+3.2 V

1. Confirm that the voltage between test point +3.2 V and GND is 3.35 V ±0.3 V 

(Backlight is OFF)/4.3 V ± 0.3 V (Backlight is ON).

IC4, C51, C37, 

C1, C2, C3

(C) 2.5 V Supply Confirmation

+2.5 V

1. Confirm that the voltage between test point +2.5 V and GND is 3.0 V ±0.1 V.

IC9, C50

(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, R59, R60, 

R42, D1, Q9, 

R53, C25, 
C28, C20, 
C21, R52, 
C26, C23, 

R27, C24, X1, 

C29, C27, Q8, 

R49, R50, 
R51, R39, 

R40, Q7, R41, 

D2, IC2, R8, 

R38

(E)* Flash ROM or EEPROM 

Confirmation

-

1. Flash ROM or EEPROM Confirmation (Execute the command 

“ChkTGA915PEXrevYY.bat”).
YY: revision number

2. Confirm the returned checksum value.
3. The checksum is displayed in the last output line.

“YY” and “checksum” vary depending on the country version. You can find them 
in the batch file, PQZZ- mentioned in JIG and PC (P.28).

IC5, IC1, R9, 

R10, R11, 

C42, Q4, R12

(F)*

BBIC Clock Adjustment

RFCLK

1. Apply 2.5 V between D (+) and D (-) 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 RFCLK executing the command “setfreq 00 xx (where 

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

IC1, X1, C35, 

R12, IC20, 

R127, R128