1
LOCATION OF CONTROLS
4
2
DISPLAY
5
3
CONNECTION
6
3.1.
Connecting the Handset
6
3.2.
Connecting the Telephone Line Cord
6
3.3.
Connecting a Communication Device
7
4
SETTINGS
8
4.1.
Selecting the Dialing Mode
8
4.2.
Time Adjustment
9
4.3.
Setting the LCD Contrast
10
4.4.
Selecting the Ringer Volume
10
5
SPECIAL FEATURES
11
5.1.
FLASH Button
11
5.2.
Selecting the Flash Time
11
5.3.
Setting the Pin Code
12
5.4.
Dial Lock
13
5.5.
Call Restriction
14
5.6.
How to Release the Establishment of Dial Lock
15
6
DISASSEMBLY INSTRUCTIONS
16
7
TROUBLE SHOOTING GUIDE
17
7.1.
Service Hints
17
7.2.
Pulse Dialing Problems
17
7.3.
Tone Dialing Problems (Handset)
18
7.4.
No Ringing Sound When Ring Signal is Input.
18
7.5.
In Use LED is Not On
19
7.6.
When the both lines are held in the Conference mode;
Line LED are not Green
19
7.7.
Does Not Hold
20
8
BLOCK DIAGRAM
21
9
CIRCUIT OPERATION
22
9.1.
Reset Circuit
22
9.2.
Telephone Line Interface
23
9.3.
Ringer Circuit
23
9.4.
Tone Detect
23
9.5.
In Use Detector Circuit
24
9.6.
Hold Circuit
25
9.7.
Speakerphone Circuit
26
10 HOW TO SET THE FLASH TIME AND REDIAL TIME
27
10.1. Flash Time
27
10.2. Redial Time
27
11 IC BLOCK DIAGRAM
28
11.1. IC801
28
11.2. Speakerphone IC Data (IC601)
29
11.3. Ringer IC Data (IC1, IC22)
30
12 MODULE BLOCK DIAGRAM
31
12.1. LCD MODULE BLOCK
31
12.2. CONNECTOR PIN ASSIGNMENT
31
13 HOW TO REPLACE FLAT PACKAGE IC
32
13.1. Preparation
32
13.2. Procedure
32
13.3. Modification Procedure of Bridge
32
14 CABINET AND ELECTRICAL PARTS LOCATION
33
15 ACCESSORIES AND PACKING MATERIALS
34
16 TERMINAL GUIDE OF THE ICs TRANSISTORS AND DIODES
35
17 REPLACEMENT PARTS LIST
36
17.1. Base Unit
36
17.2. ACCESSORIES AND PACKING MATERIALS
40
18 FOR SCHEMATIC DIAGRAM (SCHEMATIC DIAGRAM (BASE
UNIT))
41
19 SCHEMATIC DIAGRAM (BASE UNIT)
42
19.1. Main (Suffix A)
42
19.2. Main (Suffix B)
46
19.3. Operation
50
CONTENTS
Page
Page
2
KX-T2378JXW
