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1 Safety Precautions----------------------------------------------- 4

1.1. For Service Technicians --------------------------------- 4
1.2. AC Caution -------------------------------------------------- 4
1.3. Personal Safety Precautions --------------------------- 5
1.4. Service Precautions--------------------------------------- 6

2 Warning -------------------------------------------------------------- 7

2.1. About Lead Free Solder (PbF: Pb free)-------------- 7
2.2. Insulation Resistance Test ------------------------------ 8
2.3. Battery Caution--------------------------------------------- 8
2.4. Discarding of P. C. Board-------------------------------- 8

3 Specifications ----------------------------------------------------- 9
4 General/Introduction -------------------------------------------10

4.1. Optional Accessories ------------------------------------10
4.2. Translation Lists-------------------------------------------10

5 Features ------------------------------------------------------------11
6 Technical Descriptions ----------------------------------------12

6.1. Connection Diagram -------------------------------------12
6.2. General Block ---------------------------------------------13
6.3. Control Section--------------------------------------------15
6.4. Facsimile Section-----------------------------------------21
6.5. Sensors and Switches-----------------------------------27
6.6. Modem Section -------------------------------------------31
6.7. NCU Section -----------------------------------------------38
6.8. ITS (Integrated Telephone System) and

Monitor Section -------------------------------------------41

6.9. TAM Interface Section (KX-FT982/KX-FT984

only)----------------------------------------------------------41

6.10. ATAS (Automatic Telephone Answering

System) Section (KX-FT988 only)--------------------42

6.11. Operation Board Section -------------------------------43

6.12. LCD Section -----------------------------------------------44
6.13. Power Supply Board Section --------------------------45

7 Location of Controls and Components ------------------48

7.1. Overview----------------------------------------------------48
7.2. Control Panel ----------------------------------------------48

8 Installation Instructions ---------------------------------------50

8.1. Installation Space-----------------------------------------50
8.2. Connections------------------------------------------------50
8.3. Installing the Recording Paper ------------------------51
8.4. Documents the Unit can Send ------------------------52

9 Operating Instructions-----------------------------------------52

9.1. Setting Logo -----------------------------------------------52
9.2. Character Entry -------------------------------------------53

10 Test Mode ----------------------------------------------------------54

10.1. DTMF Single Tone Transmit Selection--------------55
10.2. Button Code Table----------------------------------------56
10.3. Print Test Pattern -----------------------------------------57

11 Service Mode -----------------------------------------------------58

11.1. Programing and Lists ------------------------------------58
11.2. The Example of the Printed List ----------------------62

12 Troubleshooting Guide ----------------------------------------69

12.1. Troubleshooting Summary -----------------------------69
12.2. Error Messages-Display --------------------------------70
12.3. Error Messages-Report ---------------------------------72
12.4. Remote Programming -----------------------------------94
12.5. Troubleshooting Details ---------------------------------97

13 Service Fixture & Tools-------------------------------------- 129
14 Disassembly and Assembly Instructions ------------- 130

14.1. Upper Cabinet Section-------------------------------- 131
14.2. Lower Cabinet Section-------------------------------- 134
14.3. Operation Panel Section ---------------------------- 137
14.4. Installation Position of the Lead Wires------------ 140

15 Maintenance ---------------------------------------------------- 142

15.1. Maintenance Items and Component Locations- 142
15.2. Gear Section -------------------------------------------- 144
15.3. Jams------------------------------------------------------- 150
15.4. Cleaning -------------------------------------------------- 151

16 Miscellaneous-------------------------------------------------- 153

16.1. Terminal Guide of ICs Transistors and Diodes - 153
16.2. How to Replace the Flat Package IC ------------- 155
16.3. Test Chart ------------------------------------------------ 156

17 Schematic Diagram ------------------------------------------ 158

17.1. Digital Board (PCB1): KX-FT982/KX-FT984 ---- 158
17.2. Digital Board (PCB1): KX-FT988------------------- 162
17.3. Analog Board (PCB2): KX-FT982/KX-FT984 --- 166
17.4. Operation Board (PCB3/PCB203) ----------------- 168
17.5. Power Supply Board (PCB4)------------------------ 169

18 Printed Circuit Board ---------------------------------------- 171

18.1. Digital Board (PCB1) ---------------------------------- 171
18.2. Analog Board (PCB2)  -------------------------------- 173
18.3. Operation Board (PCB3/PCB203) ----------------- 175
18.4. Power Supply Board (PCB4)------------------------ 177

19 Appendix Information of Schematic Diagram ------- 178
20 Exploded View and Replacement Parts List --------- 179

20.1. Cabinet and Mechanical Parts Location---------- 179
20.2. Replacement Parts List------------------------------- 187

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1. Before servicing, unplug the AC power cord to prevent an electric shock.
2. When replacing parts, use only the manufacturer's recommended components.
3. Check the condition of the power cord. Replace if wear or damage is evident.
4. After servicing, be sure to restore the lead dress, insulation barriers, insulation papers, shields, etc.
5. Before returning the serviced equipment to the customer, be sure to perform the following insulation resistance test to prevent

the customer from being exposed to shock hazards.

• Repair service shall be provided in accordance with repair technology information such as service manual so as to pre-

vent fires, injury or electric shock, which can be caused by improper repair work.

1. When repair services are provided, neither the products nor their parts or members shall be remodeled. 
2. If a lead wire assembly is supplied as a repair part, the lead wire assembly shall be replaced. 
3. FASTON terminals shall be plugged straight in and unplugged straight. 

• ICs and LSIs are vulnerable to static electricity.

1. Cover plastic parts boxes with aluminum foil.
2. Ground the soldering irons.
3. Use a conductive mat on worktable.
4. Do not grasp IC or LSI pins with bare fingers.

For safety, before closing the lower cabinet, please make sure of the following precautions.

1. The earth lead is fixed with the screw.
2. The AC lead is connected properly to power supply unit.
3. Wrap the earth lead around the core 5 times.
4. Wrap the AC lead around the core 5 times.