14 TROUBLESHOOTING BY SYMPTOM (HANDSET)
If your unit has below symptoms, follow the instructions in remedy column. Remedies depend on whether you have DECT tester
or not.
*: Refer to Check Point (Handset) (P.59)
14.1. 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.63) is required beforehand.
The connections of adjustment equipments are as shown in Adjustment Standard (Handset) (P.64).
Items Check
Point
Procedure Check or
Replace Parts
(A)* 1.8V Supply
Confirmation
TP12 1. Confirm that the voltage between test point TP12 and GND is 1.8V ± 0.02V.
2. Adjust the 1.8V voltage of TP12 executing command “bandgap XX“(XX is the
value).
IC1, Q2, C40,
R4
(B) DC/DC Supply
Confirmation
TP10 1. Confirm that the voltage between test point TP10 and GND is 2.97V ± 0.3V
(Backlight is OFF)/4.40V ± 0.3V (Backlight is ON).
IC1, F1, C1,
C3, C57, C74,
R1, R2, R3,
Q1, D1, L1,
R57
(C) 2.5V Supply
Confirmation
TP11 1. Confirm that the voltage between test point TP11 and GND is 2.5V ± 0.1V. IC1, Q3, C4,
C5, R9, R10,
R11
(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
(E) Charge Control Check &
Charge Current Monitor
Check
- 1. Apply 6V between J3(+) and J4(-) 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
handset power supply and try again.)
IC1, Q4, Q5,
Q9, D6, L4,
L5, C73, C74,
R5, R6, R7,
R72, F1
(F)* Charge Detection (OFF)
Check
- 1. Stop supplying 6V to CHARGE(+) and CHARGE(-).
2. Execute the command “Backloff” then “charge”.
3. Confirm that the returned value is 0x00 (hex).
IC1, Q4, Q5,
Q9 D6, D7,
L4, L5, C73,
C74, R5, R6,
R7, R72, F1
59
KX-TCD300FXS / KX-TCD300FXT / KX-TCA130FXS / KX-TCA130FXT
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