KX-FC278RU - Panasonic Fax Service Manual (repair manual). Page 2

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1 Safety Precautions -----------------------------------------------5

1.1. For Service Technicians ----------------------------------5
1.2. AC Caution---------------------------------------------------5
1.3. Personal Safety Precautions ----------------------------6

1.3.1. Moving Sections of the Unit-------------------------6
1.3.2. Live Electrical Sections ------------------------------6

1.4. Service Precautions ---------------------------------------7

1.4.1. Precautions to Prevent Damage from

Static Electricity ----------------------------------------7

2 Warning --------------------------------------------------------------8

2.1. About Lead Free Solder (PbF: Pb free) --------------8

2.1.1. Suggested PbF Solder -------------------------------8

2.2. Discarding of P. C. Board --------------------------------8
2.3. Insulation Resistance Test -------------------------------9
2.4. Battery Caution ---------------------------------------------9

3 Specifications ---------------------------------------------------- 10

3.1. Base Unit --------------------------------------------------- 10
3.2. Cordless Handset ---------------------------------------- 11
3.3. Charger Unit ----------------------------------------------- 11

4 General/Introduction ------------------------------------------- 12

4.1. Optional Accessories------------------------------------ 12
4.2. Translation Lists ------------------------------------------ 12

4.2.1. Base Unit ---------------------------------------------- 12
4.2.2. Cordless Handset ----------------------------------- 13

5 Features ------------------------------------------------------------ 14
6 Technical Descriptions---------------------------------------- 15

6.1. Connection Diagram------------------------------------- 15
6.2. General Block --------------------------------------------- 16

6.2.1. General Block Diagram ---------------------------- 17

6.3. Control (Facsimile) Section---------------------------- 18

6.3.1. ASIC (IC10) ------------------------------------------- 18
6.3.2. Flash Memory (IC16) ------------------------------- 18
6.3.3. Dynamic RAM (IC17)------------------------------- 18
6.3.4. Reset Circuit (Watch Dog Timer) ---------------- 19
6.3.5. Supervision Circuit for the Terminal Head

Temperature ------------------------------------------ 20

6.4. Facsimile Section ---------------------------------------- 21

6.4.1. Image Data Flow During Facsimile

Operation ---------------------------------------------- 21

6.4.2. Block Diagram---------------------------------------- 22
6.4.3. Thermal Head ---------------------------------------- 23
6.4.4. Scanning Block -------------------------------------- 25
6.4.5. Stepping Motor Drive Circuit---------------------- 26

6.5. Sensor and Switches------------------------------------ 28

6.5.1. Document Top Sensor (SW351)----------------- 29
6.5.2. Document Set Sensor (SW352) ----------------- 29
6.5.3. Paper Top Sensor (SW1001)--------------------- 30
6.5.4. Cover Open Sensor (SW1001) ------------------ 30
6.5.5. Film End Sensor (SW1003)----------------------- 31
6.5.6. Motor Position Sensor (SW1004) --------------- 31
6.5.7. Hook Switch (SW1501) ---------------------------- 32

6.6. Modem Section ------------------------------------------- 33

6.6.1. Function------------------------------------------------ 33
6.6.2. Modem Circuit Operation-------------------------- 39

6.7. NCU Section----------------------------------------------- 40

6.7.1. General ------------------------------------------------ 40
6.7.2. Bell Detection Circuit  ------------------------------ 40
6.7.3. On/Off Hook Circuit --------------------------------- 40

6.7.4. Pulse Dial Circuit------------------------------------ 40
6.7.5. Line Amplifier and Side Tone Circuit ----------- 40
6.7.6. CPC (Calling Party Control) Detection

Circuit ------------------------------------------------- 40

6.7.7. Auto Disconnect Circuit --------------------------- 41
6.7.8. Calling Line Identification Circuit (Russian

CID) ---------------------------------------------------- 42

6.8. ITS (Integrated Telephone System) and

Monitor Section ------------------------------------------ 43

6.8.1. Speakerphone Circuit ------------------------------ 43

6.9. Transmitter / Receiver (Cordless) ------------------- 43

6.9.1. Transmitter Block ----------------------------------- 43
6.9.2. Receiver Block--------------------------------------- 43

6.10. Operation Board Section ------------------------------ 44

6.11. LCD Section----------------------------------------------- 45

6.12. Power Supply Board Section ------------------------- 46
6.13. Cordless Handset---------------------------------------- 49

6.13.1. Block Diagram --------------------------------------- 49
6.13.2. Circuit Operation (Cordless Handset) --------- 50
6.13.3. Circuit Operation (Charger Unit) ---------------- 51

7 Location of Controls and Components ----------------- 52

7.1. Overview --------------------------------------------------- 52

7.1.1. Base Unit---------------------------------------------- 52
7.1.2. Cordless Handset----------------------------------- 52

7.2. Control Panel --------------------------------------------- 53

7.2.1. Base Unit---------------------------------------------- 53
7.2.2. Cordless Handset----------------------------------- 54

8 Installation Instructions -------------------------------------- 56

8.1. Installation Space ---------------------------------------- 56
8.2. Connections----------------------------------------------- 56

8.2.1. Base Unit---------------------------------------------- 56
8.2.2. Charger Unit------------------------------------------ 57

8.3. Battery Charge ------------------------------------------- 57
8.4. Installing the Ink film ------------------------------------ 58
8.5. Installing the Paper Tray ------------------------------- 59
8.6. Installing the Recording Paper ----------------------- 60
8.7. Battery Installation / Replacement------------------- 61

9 Operating Instructions---------------------------------------- 61

9.1. Setting Your Logo---------------------------------------- 61
9.2. Cordless Handset Programming--------------------- 62

9.2.1. Cordless Handset Features ---------------------- 62

10 Test Mode --------------------------------------------------------- 64

10.1. Facsimile Section---------------------------------------- 64

10.1.1. Button Code Table ---------------------------------- 65
10.1.2. Print Test Pattern------------------------------------ 66

11 Service Mode----------------------------------------------------- 67

11.1. Base Unit -------------------------------------------------- 67

11.1.1. Programming and Lists---------------------------- 67

11.2. Cordless Handset---------------------------------------- 71
11.3. The Example of the Printed List --------------------- 73

11.3.1. User Mode  ------------------------------------------- 73
11.3.2. Service Mode Settings ---------------------------- 74
11.3.3. History ------------------------------------------------- 75

12 Troubleshooting Guide --------------------------------------- 77

12.1. Troubleshooting Summary ---------------------------- 77

12.1.1. Precautions------------------------------------------- 77

12.2. Error Messages-Display ------------------------------- 78

12.2.1. Base Unit---------------------------------------------- 78