Read 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 online
KX-TG7227UAM
KX-TG7227UAS
KX-TG7227UAT
KX-TG7228UAS
KX-TG7228UAT
KX-TGA721RUM
KX-TGA721RUS
KX-TGA721RUT
KX-TGA721UAJ
KX-TGA721UAM
KX-TGA721UAS
KX-TGA721UAT
Metic Gray Version
Silver Version
Titanium Black Version
(for Ukraine)
2.2. About Lead Free Solder (Pbf: Pb free)--------------- 4
4 Technical Descriptions ----------------------------------------- 7
4.2. Circuit Operation (Base Unit) --------------------------- 8
4.3. Block Diagram (Handset)-------------------------------11
4.4. Circuit Operation (Handset)----------------------------12
4.5. Circuit Operation (Charger Unit) ----------------------13
4.6. Signal Route -----------------------------------------------14
6.2. Battery-------------------------------------------------------17
7.2. Handset Settings -----------------------------------------19
7.3. Registering a Handset to the Base Unit ------------20
7.4. Copying Phonebook Entries ---------------------------21
7.5. Dialling Mode (Tone/Pulse) ----------------------------21
7.6. Error Message---------------------------------------------21
7.7. Troubleshooting-------------------------------------------22
7.8. For Service Hint-------------------------------------------24
8.2. Copying Phonebook Items when Repairing -------29
8.3. How to Clear User Setting------------------------------31
9.2. Troubleshooting by Symptom (Base Unit and
9.4. How to Replace the Flat Package IC----------------50
9.5. How to Replace the LLP (Leadless Leadframe
10.2. How to Replace the Handset LCD -------------------58
11.2. Adjustment Standard (Base Unit)---------------------61
11.3. Adjustment Standard (Charger Unit)-----------------62
11.4. The Setting Method of JIG (Handset) ---------------63
11.5. Adjustment Standard (Handset) ----------------------65
11.6. Things to Do after Replacing IC or X'tal ------------66
11.7. RF Specification-------------------------------------------68
11.8. How to Check the Handset Speaker or
12.2. Schematic Diagram (Base Unit) ----------------------72
12.3. Schematic Diagram (Base Unit_Operation) -------74
12.4. Schematic Diagram (Handset) ------------------------76
13.2. Circuit Board (Base Unit_Operation)---------------- 81
13.3. Circuit Board (Handset) -------------------------------- 83
13.4. Circuit Board (Charger Unit)--------------------------- 85
14.2. CPU Data (Handset) ------------------------------------ 88
14.3. Terminal Guide of the ICs, Transistors and
15.2. Cabinet and Electrical Parts (Handset)------------- 92
15.3. Cabinet and Electrical Parts (Charger Unit) ------- 93
15.4. Accessories and Packing Materials ----------------- 94
15.5. Replacement Part List ---------------------------------- 97
2. If a lead wire assembly is supplied as a repair part, the entire lead wire assembly shall be replaced.
3. FASTON terminals shall be plugged straight in and unplugged straight out.
2. Ground the soldering irons.
3. Use a conductive mat on worktable.
4. Do not grasp IC or LSI pins with bare fingers.
2. Replace only with the same or equivalent type recommended by the manufacturer.
3. Dispose of used batteries according to the manufacture’s Instructions.
tains lead.
We will use PbF solder when discussing the lead free solder used in our manufacturing process which is made from Tin (Sn),
Silver (Ag), and Copper (Cu).
This model, and others like it, manufactured using lead free solder will have PbF stamped on the PCB. For service and repair
work we suggest using the same type of solder.