Panasonic KX-TG1843ALS, Service Manual

Page: 25 / 93

8 TROUBLESHOOTING BY SYMPTOM (BASE UNIT AND
CHARGER UNIT)
Ifyour 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 ofadjustment equipments are as shown in Adjustment Standard (Base Unit) (P.32).
Items Check
Point
Procedure Check or
Replace Parts
(
A
) 2.5V Supply
Confirmation
VDD4 1. Confirm that the voltage between test point VDD4 and GND is 2.5V ± 0.2V. D1, IC11, C4,
C7, R10, R11,
C30, C26, C28,
L12
( B ) 3.0V Supply
Confirmation
VDD3 1. Confirm that the voltage between test point VDD3 and GND is 3.0V ± 0.2V. C2, IC1, C3,
C8, Q2, R5,
C10, R18, R19,
C11
( C )* 1.8V Supply
Confirmation
VDD5 1. Confirm that the voltage between test point VDD5 and GND is 1.8V ± 0.1V. Q3, R6, C25,
D7, D8
( D )* BBIC Confirmation - 1. BBIC Confirmation (Execute the command “getchk”).
2. Confirm the returned checksum value.
Connection ofchecksum value and program number is shown below.
IC4, X1, C42,
C43, R40, C81,
C82, C84
25
KX-TG1843ALS / KX-TGA122AZS / KX-TGA121AZS