Panasonic KX-TG8107UA, Service Manual

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KX-TG8107UA/KX-TG8108UA/KX-TGA810UA
9.3. 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.45)
9.3.1. Check Point (Handset)
Please follow the items below when BBIC or EEPROM 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 (Handset) (P.60).
Items Check
Point
Procedure Check or
Replace Parts
( A )* 1.8V Supply Adjustment 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).
IC1, Q2, C10
( B ) DC/DC Supply Confir-
mation
VDD3 1. Confirm that the voltage between test point VDD3 and GND is 3.6V ± 0.3V
(Backlight is OFF)/4.2V ± 0.3V (Backlight is ON).
IC1, F1, C1,
C2, C3, R1,
Q1, D1, L1, D2
( C ) 2.5V Supply Confirma-
tion
VDD2 1. Confirm that the voltage between test point VDD2 and GND is 2.5V ± 0.1V. IC1, Q3, C4,
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, C7,
C6, R19
( E )* EEPROM Confirmation - 1. EEPROM Confirmation (Execute the command “ChkTGA810XXrevYY.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).
IC1, IC3, R40,
R41, R42,
Q10, Q11,
R43, R44, C37
( F ) Charge Control Check &
Charge Current Monitor
Check
- 1. Apply 3.5V between J3(+) and TP21 with DC power supply and set current limit
to 250mA.
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, L4, L5,
R5, R6, F1,
R8, D7, D8, R7