Read Panasonic KX-DT521RU Service Manual Supplement online
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TABLE OF CONTENTS
PAGE
PAGE
1 Technical Descriptions------------------------------------------3
1.1. Circuit Operations ------------------------------------------3
1.1.1. LCD Circuit ----------------------------------------------3
1.1.2. Reset Circuit --------------------------------------------3
1.1.3. Analog Circuit ------------------------------------------4
1.1.2. Reset Circuit --------------------------------------------3
1.1.3. Analog Circuit ------------------------------------------4
2 Troubleshooting Guide------------------------------------------6
2.1. No Operation ------------------------------------------------6
2.2. ASIC1(IC300) Does Not Operate -------------------- 12
2.3. LCD Does Not Operate --------------------------------- 13
2.4. DXDP Does Not Work ---------------------------------- 14
2.5. Audio Problem -------------------------------------------- 15
2.6. Handset Does Not Work-------------------------------- 15
2.2. ASIC1(IC300) Does Not Operate -------------------- 12
2.3. LCD Does Not Operate --------------------------------- 13
2.4. DXDP Does Not Work ---------------------------------- 14
2.5. Audio Problem -------------------------------------------- 15
2.6. Handset Does Not Work-------------------------------- 15
2.6.1. Receive ------------------------------------------------ 15
2.6.2. Send ---------------------------------------------------- 16
2.6.2. Send ---------------------------------------------------- 16
2.7. Headset Does Not Work-------------------------------- 17
2.7.1. Receive ------------------------------------------------ 17
2.7.2. Send ---------------------------------------------------- 18
2.7.2. Send ---------------------------------------------------- 18
2.8. Speaker-Phone/Ringer Does Not Work ------------ 18
2.8.1. Receive / Ringer ------------------------------------- 18
2.8.2. Send ---------------------------------------------------- 19
2.8.2. Send ---------------------------------------------------- 19
2.9. LED Does Not Light ------------------------------------- 20
3 Schematic Diagram--------------------------------------------- 21
3.1. Main No.1 -------------------------------------------------- 21
3.2. Main No.2 -------------------------------------------------- 23
3.2. Main No.2 -------------------------------------------------- 23
4 Printed Circuit Board ------------------------------------------ 25
4.1. Main Board------------------------------------------------- 25
4.1.1. Component View ------------------------------------ 25
4.1.2. Bottom View ------------------------------------------ 26
4.1.2. Bottom View ------------------------------------------ 26
5 Exploded View and Replacement Parts List ----------- 27
5.1. Replacement Parts List --------------------------------- 27
5.1.1. Main Board Parts ------------------------------------ 27
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