Troubleshooting By Symptom (Handset) - Panasonic KX-TG7100FXS Service Manual

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.37)
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.50) is required beforehand.
The connections of adjustment equipments are as shown in Adjustment Standard (Handset) (P.52).
Items
(A)* 1.8 V Supply Adjustment
(B) DC/DC Supply Confir-
mation
(C) 2.5 V Supply Confirma-
tion
(D)* BBIC Confirmation
(E)* EEP-ROM Confirmation
(F) Charge Control Check &
Charge Current Monitor
Check
Check
Point
VDD1 1. Confirm that the voltage between test point VDD1 and GND is 1.8 V ± 0.02 V.
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 3.3 V ± 0.3 V
(Backlight is ON).
VDD2 1. Confirm that the voltage between test point VDD2 and GND is 2.5 V ± 0.1 V.
- 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 "ChkTGA711XXrevYY").
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.46).
- 1. Apply 3.5 V between J3(+) and J4(-) with DC power supply and set current limit
to 250 mA.
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.)
KX-TG7100FXS/KX-TG7100FXT/KX-TG7102FXS/KX-TGA711FXS/KX-TGA711FXT
Procedure
37
Check or
Replace Parts
IC1, Q2, C10
IC1, F1, C1,
C2, C3, R1,
Q1, D1, L1
IC1, Q3, C5
IC1, X1, C6,
C7, R19
IC1, IC3, R40,
R41, R42,
Q10, Q11,
R43, R44,
C37
IC1, Q4, Q5,
Q9, D6, D7,
D8, L4,
L5, R5, R6,
R7, R8, F1