Troubleshooting By Symptom (Base Unit And Charger Unit); Check Point (Base Unit) - Panasonic KX-TG1843ALS Service Manual

8 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.
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.25)
8.1.

Check Point (Base Unit)

Please follow the items below when BBIC or EEPROM or FLASH ROM is replaced.
Note:
After the measuring, sock up the solder of TP.
*: PC Setting (P.38) is required beforehand.
The connections of adjustment equipments are as shown in Adjustment Standard (Base Unit) (P.32).
Items
(A) 2.5V Supply
Confirmation
(B) 3.0V Supply
Confirmation
(C)* 1.8V Supply
Confirmation
(D)* BBIC Confirmation
Check
Point
VDD4 1. Confirm that the voltage between test point VDD4 and GND is 2.5V ± 0.2V.
VDD3 1. Confirm that the voltage between test point VDD3 and GND is 3.0V ± 0.2V.
VDD5 1. Confirm that the voltage between test point VDD5 and GND is 1.8V ± 0.1V.
- 1. BBIC Confirmation (Execute the command "getchk").
2. Confirm the returned checksum value.
Connection of checksum value and program number is shown below.
Procedure
25
KX-TG1843ALS / KX-TGA122AZS / KX-TGA121AZS
Check or
Replace Parts
D1, IC11, C4,
C7, R10, R11,
C30, C26, C28,
L12
C2, IC1, C3,
C8, Q2, R5,
C10, R18, R19,
C11
Q3, R6, C25,
D7, D8
IC4, X1, C42,
C43, R40, C81,
C82, C84