Panasonic KX-TG1283JXS, Service Manual

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8 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.27)
8.1. Check Point (Base Unit)
Please follow the items below when BBIC or EEPROM or FLASH ROM is replaced.
Note:
After the measuring, sock up the solder of TP.
*:
PC Setting (P.39) is required beforehand.
The connections of adjustment equipments are as shown in Adjustment Standard (Base Unit) (P.33).
Items Check
Point
Procedure Check or
Replace Parts
( A ) 2.5V Supply
Confirmation
VDD4 1. Confirm that the voltage between test point VDD4 and GND is 2.5V ± 0.2V. D1, IC11, C4,
C7, R10, R11,
C30, C26, C28,
L12
( B ) 3.0V Supply
Confirmation
VDD3 1. Confirm that the voltage between test point VDD3 and GND is 3.0V ± 0.2V. C2, IC1, C3,
C8, Q2, R5,
C10, R18, R19,
C11
( C )* 1.8V Supply
Confirmation
VDD5 1. Confirm that the voltage between test point VDD5 and GND is 1.8V ± 0.1V. Q3, R6, C25,
D7, D8
( 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.
IC4, X1, C42,
C43, R40, C81,
C82, C84
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KX-TG1283JXS / KX-TG1283JXT / KX-TCA122CXS / KX-TCA122CXT / KX-TCA121CXS / KX-TCA121CXT