Troubleshooting By Symptom (Handset); Check Point (Handset) - Panasonic KX-TG1283JXS Service Manual

9 TROUBLESHOOTING BY SYMPTOM (HANDSET)

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 (Handset) (P.35)
9.1.

Check Point (Handset)

Please follow the items below when BBIC or EEPROM 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 (Handset) (P.40).
Items
(A)* 1.8V Supply Adjustment
(B) DC/DC Supply
Confirmation
(C) 2.5V Supply
Confirmation
(D)* BBIC Confirmation
(E)* EEP-ROM Confirmation
Check
Point
VDD1 1. Confirm that the voltage between test point VDD1 and GND is 1.8V ± 0.02V.
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).
VDD3 1. Confirm that the voltage between test point VDD3 and GND is 3.3V ± 0.3V
(Backlight is ON).
VDD2 1. Confirm that the voltage between test point VDD2 and GND is 2.5V ± 0.1V.
- 1. BBIC Confirmation (Execute the command "getchk").
2. Confirm the returned checksum value.
Connection of checksum value and program number is shown below.
- 1. EEP-ROM Confirmation (Execute the command "ChkTCA121XXrevYY").
XX: country code
YY: revision number
2. Confirm the returned checksum value.
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.39).
KX-TG1283JXS / KX-TG1283JXT / KX-TCA122CXS / KX-TCA122CXT / KX-TCA121CXS / KX-TCA121CXT
Procedure
35
Check or
Replace Parts
IC1, Q2, C40
IC1, F1, C1,
C3, C57, R1,
Q1, D1, L1,57
IC1, Q3, C4,
C5
IC1, X1,C7,
R19
IC3, IC1, R39,
R40, R91,
R90, R96,
Q10, Q11,
C113