Panasonic KX-TG7227UAJ / KX-TG7227UAM / KX-TG7227UAS / KX-TG7227UAT / KX-TG7228UAS / KX-TG7228UAT / KX-TGA721RUM / KX-TGA721RUS / KX-TGA721RUT / KX-TGA721UAJ / KX-TGA721UAM / KX-TGA721UAS / KX-TGA721UAT Service Manual ▷ View online
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KX-TG7227UA/KX-TG7228UA/KX-TGA721RU/KX-TGA721UA
9.1.4.3.
Check Table for RF part
Note:
(*1) Refer to Registering a Handset to the Base Unit (P.20)
(*2) Refer to RF-BBIC Interface Signal Wave Form (P.41)
(*3) Refer to Adjustment Standard (Base Unit) (P.61)
(*4) Refer to Adjustment Standard (Handset) (P.65)
(*2) Refer to RF-BBIC Interface Signal Wave Form (P.41)
(*3) Refer to Adjustment Standard (Base Unit) (P.61)
(*4) Refer to Adjustment Standard (Handset) (P.65)
9.1.4.4.
RF-BBIC Interface Signal Wave Form
No.
Item
BU (Base Unit) Check
HS (Handset) Check
1
Link Confirmation Normal
1. Register Regular HS to BU (to be
checked). (*1)
2. Press [Talk] key of the Regular HS to
establish link.
1. Register HS (to be checked) to Regular
BU. (*1)
2. Press [Talk] key of the HS to establish link.
2
Control signal confirmation
1. Check BBIC interface. (*2)
1. Check BBIC interface. (*2)
3
X’tal Frequency confirmation
1. Check X’tal Frequency. (*3)
(10.368 MHz ± 100 Hz)
1. Check X’tal Frequency. (*4)
(10.368 MHz ±100Hz)
4
Range Confirmation Normal
1. Register Regular HS to BU (to be
checked). (*1)
2. Press [Talk] key of the Regular HS to
establish link.
3. Compare the range of the BU (being
checked) with that of the Regular BU.
1. Register HS (to be checked) to Regular
BU. (*1)
2. Press [Talk] key of the HS to establish link.
3. Compare the range of the HS (being
3. Compare the range of the HS (being
checked) with that of the Regular HS.
SYCL
SYEN
SYDA
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KX-TG7227UA/KX-TG7228UA/KX-TGA721RU/KX-TGA721UA
9.1.5.
Check Handset Transmission
Cross Reference:
Signal Route (P.14)
9.1.6.
Check Handset Reception
Cross Reference:
How to Check the Handset Speaker or Receiver (P.69).
Signal Route (P.14)
Signal Route (P.14)
9.1.7.
Check Caller ID
Cross Reference:
Signal Route (P.14)
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KX-TG7227UA/KX-TG7228UA/KX-TGA721RU/KX-TGA721UA
9.1.8.
Bell Reception
9.1.8.1.
Base Unit
9.1.8.2.
Handset
Cross Reference:
Telephone Line Interface (P.10)
Check Link (P.35)
How to Check the Handset Speaker or Receiver (P.69)
Check Link (P.35)
How to Check the Handset Speaker or Receiver (P.69)
9.1.9.
Check TAM Operation
Cross Reference:
Power Supply Circuit (P.9)
Note:
(*1) When replacing FLASH MEMORY (IC11), TAM data need to be written to it. Refer to Base Unit of Things to Do after
Replacing IC or X'tal (P.66)
Replacing IC or X'tal (P.66)
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KX-TG7227UA/KX-TG7228UA/KX-TGA721RU/KX-TGA721UA
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.
(*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.44)
level in detail.
(*2) Refer to Check Point (Base Unit) (P.44)
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.
*: PC Setting (P.59) is required beforehand.
The connections of simulator equipments are as shown in Adjustment Standard (Base Unit) (P.61).
*: PC Setting (P.59) is required beforehand.
The connections of simulator equipments are as shown in Adjustment Standard (Base Unit) (P.61).
Items
Check
Point
Procedure
Check or
Replace Parts
(A) 3.3 V Supply Confirma-
tion
VDD3
1. Confirm that the voltage between test point VDD3 and GND is 3.3 V ± 0.2 V.
IC1, C31, C32,
R38, R39, C36,
C37
(B) 2.5 V Supply Confirma-
tion
VDD2
1. Confirm that the voltage between test point VDD2 and GND is 2.5 V ± 0.2 V.
Q9, C70, C71
(C) 1.8 V Supply Confirma-
tion
VDD1
1. Confirm that the voltage between test point VDD1 and GND is 1.8 V ± 0.1 V.
Q8, R72, D12,
C64, C68
(D)*
BBIC Confirmation
-
1. BBIC Confirmation (Execute the command “getchk”).
2. Confirm the returned checksum value.
2. Confirm the returned checksum value.
Connection of checksum value and program number is shown below.
IC7, R73, C62,
C63, X1, C72,
R75~R81, R62,
R63
(E)* EEPROM Confirmation
-
1. EEP-ROM Confirmation (Execute the command “ChkTG7220XXrevYY.bat”).
XX: country code
YY: revision number
YY: revision number
2. Confirm the returned checksum value.
3. The checksum is displayed in the last output line.
3. The checksum is displayed in the last output line.
Note:
“XX”, “YY”, and “checksum” vary depending on the country version. You can find
them in the batch file, PQZZ- mentioned in JIG and PC (P.59).
them in the batch file, PQZZ- mentioned in JIG and PC (P.59).
IC5, C51, R62,
R63, C50, Q25,
R134, R141,
C160
(F)* BBIC Clock Adjustment
CLK
1. Check X’tal Frequency. (10.368 MHz ± 100 Hz).
Input Command “rdeeprom 00 01 01”, then you can confirm the current value.
2. If the frequency is not 10.368 MHz ± 100Hz, Adjust the frequency of CLK exe-
cuting the command “setfreq xx (where xx is the value)” so that the reading of
the frequency counter is 10.368000 MHz ± 20 Hz.
the frequency counter is 10.368000 MHz ± 20 Hz.
IC10, C111,
C112, X1, R73,
C62, C63
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