Troubleshooting By Symptom (Base Unit And Charger Unit) - Panasonic KX-TG6551CAM Service Manual

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 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 each other.
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.41)
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 (Base Unit) (P.53) is required beforehand.
The connections of simulator equipments are as shown in Adjustment Standard (Base Unit) (P.55).
Items
(A) 3.0 V Supply
Confirmation
(B) 1.2 V 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
VBAT 1. Confirm that the voltage between test point VDD3 and GND is 3.0 V ± 0.2 V.
VDDC 1. Confirm that the voltage between test point VDDC and GND is 1.2 V ± 0.1 V.
+3.0V 1. Confirm that the voltage between test point +3.0V 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).
CLK 1. Input Command " sendchar sfr", then you can confirm the current value.
2. Check X'tal Frequency. (13.824 MHz ± 100 Hz).
3. If the frequency is not 13.824 MHz ± 100 Hz, adjust the frequency of CLK
executing the command "sendchar sfr xx xx (where xx is the value)" so that
the reading of the frequency counter is 13.824 MHz ± 7 Hz.
1. Connect Telephone Socket to Tel-simulator which is connected with 600 Ω.
-
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),(T).
Check item (A)-(G),(Q),(T).
-
Check item (Q).
Check item (Q).
Check item (A)-(I).
Procedure
checksum value program number
82D2 DC01EN
41
KX-TG6551CAM/KX-TGA650RUM/KX-TGA651RUM
Remedy (*2)
You have DECT Tester.
(Model Number : CMD60)
Check item (A)-(I), (J)-(P),(T).
Check item (A)-(G), (J)-(P), (Q),(T).
Check item (J)-(P).
Check item (Q).
Check item (Q).
Check item (A)-(P).
Replace Parts
C304, C310,
C303, D301,
C341, F301,
Q301, L301,
Q302, IC301,
R301, R303,
R308, R306
IC601, C504,
IC501, X501,
RA504, R505
IC661, IC501,
R612, R606,
IC501, X501,
C508, C509
P101, D101,
R141, R142,
Q142, R144,
R145, D141,
R162, R165,
Q161, R161,
R164, R163,
R167, R651,
Check or
IC501
C521
R605
R152