KX-AT7730RU (serv.man2) — Panasonic Telephone Service Manual (repair manual). Page 2

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2
KX-AT7730 Series
TABLE OF CONTENTS
PAGE
1 Safety Precautions -----------------------------------------------3
1.1. For Service Technicians  ---------------------------------3
2 Warning --------------------------------------------------------------3
2.1. Information for Users on Collection and 
Disposal of Old Equipment and used Batteries-----3
2.2. About Lead Free Solder (PbF: Pb free) --------------4
2.2.1. Suggested PbF Solder -------------------------------4
2.3. Discarding of P. C. Board --------------------------------4
3 Specifications ------------------------------------------------------5
4 Technical Descriptions------------------------------------------6
4.1. Block Diagram ----------------------------------------------6
4.2. Circuit Operations------------------------------------------7
4.2.1. KEY INPUT CONTROL CIRCUIT-----------------7
4.2.2. LED CIRCUIT ------------------------------------------8
4.2.3. DATA COMMUNICATION CIRCUIT --------------9
4.2.4. TONE GENERATION CIRCUIT ----------------- 10
4.2.5. HANDSET CIRCUIT-------------------------------- 11
4.2.6. SPEAKERPHONE CIRCUIT --------------------- 12
5 Location of Controls and Components------------------ 14
5.1. Name and Locations ------------------------------------ 14
6 Installation Instructions--------------------------------------- 16
6.1. Connections ----------------------------------------------- 16
7 Troubleshooting Guide---------------------------------------- 17
7.1. NO OPERATION ----------------------------------------- 17
7.2. HANDSET TROUBLE----------------------------------- 18
7.3. SPEAKER-PHONE TROUBLE ----------------------- 19
7.4. TONE DIAL TORUBLE --------------------------------- 20
7.5. THE ELECTRONIC VOLUME OF THE 
SPEAKER-PHONE DOES NOT WORK ----------- 20
7.6. THE ELECTRONIC VOLUME OF HANDSET 
DOES NOT WORK -------------------------------------- 20
8 Disassembly and Assembly Instructions--------------- 21
9 Maintenance ------------------------------------------------------ 23
9.1. How To Replace a Flat Package IC ----------------- 23
9.1.1. Preparation-------------------------------------------- 23
9.1.2. Removal Procedure--------------------------------- 23
9.1.3. Procedure --------------------------------------------- 23
9.1.4. Removing Solder From Between Pins --------- 23
10 Schematic Diagram--------------------------------------------- 24
10.1. for KX-AT7730X, XB / KX-AT7730SX, SXB ------- 24
10.2. for KX-AT7730NE, NEB / KX-AT7730HK, HKB--- 25
10.3. for KX-AT7730UE, UEB -------------------------------- 26
10.4. for KX-AT7730RU ---------------------------------------- 27
11 Printed Circuit Board ------------------------------------------ 28
11.1. COMPONENT VIEW------------------------------------ 28
11.2. BOTTOM VIEW------------------------------------------- 29
12 Appendix Information of Schematic Diagram --------- 30
13 Exploded View and Replacement Parts List ----------- 31
13.1. CABINET AND ELECTRICAL PARTS 
LOCATION------------------------------------------------- 31
13.2. ACCESSORIES AND PACKING MATERIALS --- 32
13.3. Replacement Parts List --------------------------------- 33
13.3.1. Cabinet and Electrical Parts ---------------------- 33
13.3.2. Accessories and Packing Materials------------- 34
13.3.3. Main Board Parts ------------------------------------ 34
14 History -------------------------------------------------------------- 45
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