Troubleshooting By Symptom (Base Unit And Charger Unit); Check Point (Base Unit) - Panasonic KX-TGCA20EX Service Manual

KX-TGC210/KX-TGC212/KX-TGC213/KX-TGC220/KX-TGC222/KX-TGCA20
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.
Symptom
You cannot dial.
You cannot hear the caller's voice.
You cannot use the handset a little away from base unit even if the
handset is within range of the base unit.
The acoustic transmit level is high or low.
The acoustic reception level is high or low.
Base unit and handset do not link to each other.
The unit cannot charge.
TAM does not work. (for KX-TGC220 only)
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.40)
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.
*: The Setting Method of JIG (P.51) is required beforehand.
The connections of simulator equipment are as shown in Adjustment Standard (Base Unit) (P.53).
Items
(A) 3.0 V Supply
Confirmation
(B) 1.8 V Supply
Confirmation
(C) Charge Pump 3.0V
Supply Confirmation
(D) Charge Pump 3.0V
Supply Confirmation
(E)* BBIC Confirmation
(F)* EEPROM Confirmation
(G)* BBIC Clock Adjustment
(H)* Hookswitch Check with
DC Characteristics
Check
Point
VDD3 1. Confirm that the voltage between test point VDD3 and GND is 3.0 V ± 0.2 V.
VDD1 1. Confirm that the voltage between test point VDD1 and GND is 1.8 V ± 0.02 V.
2. Execute the command "VDD", then check the current value.
3. Adjust the 1.8V voltage of VDD1 executing command "VDD XX"(XX is the
value).
VDD5 1. Confirm that the voltage between test point VDD5 and GND is 3.0 V -0.1/+0.3
V.
VDD4 1. Confirm that the voltage between test point VDD4 and GND is 3.0 V ± 0.2 V.
- 1. BBIC Confirmation (Execute the command "getchk").
2. Confirm the returned checksum value.
Connection of checksum value and program number is shown below.
ex.)
- 1. EEP-ROM Confirmation (Execute the command "sendchar EPV").
2. Confirm the returned Value. (Value for reference is written at "EEPROM C/
SUM" in Software_Version_Table.xls).
CKM 1. Confirm that the voltage between testpoint VDD4 and GND is less than 1.0 V.
2. Input Command " sendchar sfr", then you can confirm the current value.
3. Check X'tal Frequency. (10.368 MHz ± 100 Hz).
4. If the frequency is not 10.368 MHz ± 100 Hz, adjust the frequency of CKM
executing the command "sendchar sfr xx xx (where xx is the value)" so that
the reading of the frequency counter is 10.368000 MHz ± 5 Hz.
1. Connect Telephone Socket to Tel-simulator which is connected with 600 .
-
2. Set line voltage to 48 V and line current to 40mA at off-hook condition of
normal telephone.
3. Execute the command "hookoff"
4. Confirm that the line current is 40 mA ± 5 mA.
5. Execute the command "hookon".
6. Confirm that the line current is less than + 0.8 mA.
You don't have DECT Tester.
Check item (A) - (I).
Check item (A) - (G), (O).
-
Check item (O).
Check item (O).
Check item (A) - (I).
Check item (P).
Check item (Q).
Procedure
checksum value program number
9CF3 DE91EN
40
Remedy (*2)
You have DECT Tester.
(Model Number: CMD60)
Check item (A) - (I), (J) - (N).
Check item (A) - (G), (J) - (N), (O).
Check item (J) - (N).
Check item (O).
Check item (O).
Check item (A) - (N).
Check item (P).
Check item (Q).
Check or
Replace Parts
IC302, R321,
R322, C341,
C342 , R905,
D905
Q301, IC501,
R311, C311,
C516, C517
IC501, C512
IC501, C509
IC501, X501
IC501, RA611,
IC611, C611
IC501, X501,
C502
P101, Q141,
R141, R142,
Q142, R144,
R145, D101,
R160, R162,
R169, R170,
D141, Q161,
R151, IC501