KX-UT113RU, KX-UT113RU-B, KX-UT123RU, KX-UT123RU-B (serv.man3) - Panasonic PBX Service Manual (repair manual). Page 2

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1 Safety Precautions -----------------------------------------------3

1.1. For Service Technicians  ---------------------------------3

2 Warning --------------------------------------------------------------3

2.1. About Lead Free Solder (PbF: Pb free) --------------3
2.2. Discarding of P. C. Board --------------------------------4

3 Specifications ------------------------------------------------------5
4 Technical Descriptions------------------------------------------6

4.1. Block Diagram ----------------------------------------------6
4.2. Circuit Operations ------------------------------------------7

5 Location of Controls and Components------------------ 15

5.1. Name and Locations ------------------------------------ 15

6 Installation Instructions--------------------------------------- 18

6.1. Connections ----------------------------------------------- 18

7 Test Mode---------------------------------------------------------- 20

7.1. Peer to Peer Test Mode -------------------------------- 20
7.2. KEYs and LEDs Test mode---------------------------- 22

8 Service Mode ----------------------------------------------------- 23

8.1. Factory Setting-------------------------------------------- 23
8.2. How to Change MAC Address Label---------------- 23

9 Troubleshooting Guide---------------------------------------- 25

9.1. No Operation ---------------------------------------------- 25
9.2. LCD Does Not Operate--------------------------------- 33
9.3. ASIC Does Not Work------------------------------------ 34
9.4. Handset Does Not work -------------------------------- 35
9.5. Headset Does Not work -------------------------------- 36
9.6. Speaker-Phone Does Not Work ---------------------- 37
9.7. Ethernet Does Not work -------------------------------- 38
9.8. LED Does Not Light ------------------------------------- 40

10 Disassembly and Assembly Instructions--------------- 41

10.1. Remove Main Board and Ope Board --------------- 41
10.2. Remove and Assembly for LCD   -------------------- 43
10.3. Assembly for Lead wire--------------------------------- 44

11 Maintenance ------------------------------------------------------ 45

11.1. Terminal Guide of the ICs Transistors and

Diodes------------------------------------------------------- 45

11.2. How To Replace a Flat Package IC ----------------- 46

12 Schematic Diagram--------------------------------------------- 48

12.1. UT123RU Main No.1 ------------------------------------ 48
12.2. UT123RU Main No.2 ------------------------------------ 52
12.3. UT123RU Main No.3 ------------------------------------ 54
12.4. UT123RU Main No.4 ------------------------------------ 55
12.5. UT113RU Main No.1 ------------------------------------ 58
12.6. UT113RU Main No.2 ------------------------------------ 62
12.7. UT113RU Main No.3 ------------------------------------ 64
12.8. UT113RU Main No.4 ------------------------------------ 65
12.9. Ope ---------------------------------------------------------- 68

12.10. Waveform -------------------------------------------------- 70

13 Printed Circuit Board ------------------------------------------ 73

13.1. Main Board------------------------------------------------- 73
13.2. Ope Board ------------------------------------------------- 75

14 Appendix Information of Schematic Diagram --------- 76
15 Exploded View and Replacement Parts List ----------- 77

15.1. IC Data------------------------------------------------------ 77
15.2. Cabinet and Electric Parts ----------------------------- 83
15.3. Accessories and Packing Materials ----------------- 84
15.4. Replacement Parts List --------------------------------- 85