Panasonic KX-TG8021BXS, Service Manual

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KX-TG8021BXS/KX-TG8021BXT/KX-TGA800BXS/KX-TGA800BXT
9.2. Troubleshooting by Symptom (Base Unit and Charger Unit)
If your unit has below symptoms, follow the instructions in remedy column. Remedies depend on whether you have DECT tester
(*1) or not.
Note:
(*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 (Base Unit) (P.45)
9.2.1. Check Point (Base Unit)
Please follow the items below when BBIC or EEPROM or FLASH is replaced.
Note:
After the measuring, suck up the solder of TP.
*:
PC Setting (P.58) is required beforehand.
The connections of simulator equipments are as shown in Adjustment Standard (Base Unit) (P.60).
Items Check
Point
Procedure Check or
Replace Parts
( A ) 3.0 V Supply Confirma-
tion
VDD3 1. Confirm that the voltage between test point VDD3 and GND is 3.0 V ± 0.2 V. IC1, C31, C32,
R38, R39, C36,
F1, C37, D1
( B ) 1.8 V Supply Confirma-
tion
VDD1 1. Confirm that the voltage between test point VDD1 and GND is 1.8 V ± 0.1 V. Q8, C75, C614,
C61
,
C64, C68,
IC7
( C ) Charge Pump
2.5V Supply Confirma-
tion
VDD5 1. Confirm that the voltage between test point VDD5 and GND is 2.5 V -0.1/+0.3
V.
IC7, C625
( D ) Charge Pump
3.0V Supply Confirma-
tion
VDD4 1. Confirm that the voltage between test point VDD4 and GND is 3.0 V ± 0.2 V. IC7, C422
( E )* 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.
IC7, X1, R77,
R79, R80
( F )* EEPROM Confirmation - 1. EEP-ROM Confirmation (Execute the command “ChkTG7320XXrevYY.bat”).
XX: country code
YY: revision number
2. Confirm the returned checksum value.
3. The checksum is displayed in the last output line.
Note:
“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).
IC7, RA402,
C51, R657,
IC401