— 23 —
IC's
Unit [V]
Unit [V]
Ref.
No.
Pin
STBY
TALK
Note
Note
8
0.0
ROW01
0.0
ROW01
9
0.0
ROW02
0.0
ROW02
10
0.0
0.0
11
0.0
TONE_OUT
0.0
TONE_OUT
12
3.7
Dvcc
3.7
Dvcc
13
0.0
DGND
0.0
DGND
14
2.3
2.3
15
2.3
2.3
16
2.3
2.3
17
2.3
2.3
18
2.3
2.3
19
2.3
2.3
20
2.3
2.3
21
2.3
2.3
22
2.3
2.3
23
2.3
2.3
24
2.3
2.3
25
2.3
2.3
26
2.3
2.3
27
2.3
2.3
28
0.0
DGND
0.0
DGND
29
3.0
3.0
30
0.0
0.0
31
0.0
GND
0.0
GND
32
1.5
1.5
IC4
33
1.5
1.5
34
3.7
Vcc
3.7
Vcc
35
1.5
1.5
36
0.3
0.3
37
3.7
AVcc
3.7
AVcc
38
0.0
0.0
39
3.7
3.7
40
0.0
0.0
41
1.5
1.5
42
1.5
1.5
43
1.5
1.5
44
1.5
1.5
45
1.5
1.5
46
0.0
0.0
47
1.5
1.5
48
1.5
1.5
49
1.5
Vref
1.5
Vref
50
0.0
PLLGND
0.0
PLLGND
51
3.7
PLLVcc
3.7
PLLVcc
52
3.7
PLLVcc
3.7
PLLVcc
53
1.1-0.0
X'TAL
1.1-0.0
X'TAL
54
1.4-0.0
X'TAL
1.4-0.0
X'TAL
55
0.0
DGND
0.0
DGND
56
3.7
RESET
3.7
RESET
57
3.7
PDN
3.7
PDN
58
3.7
3.7
Ref.
No.
Pin
STBY
TALK
Note
Note
59
0.0
0.0
60
0.0
0.0
61
0.0
0.0
62
0.0
0.0
63
3.7
3.7
64
3.5-0.0
DATA_IN
3.5-0.0
DATA_IN
65
0.0
RX_MUTE
3.7
RX_MUTE
66
0.0
TX_MUTE
3.7
TX_MUTE
67
0.0
0.0
68
3.2-0.0
PLLENB
3.2
PLLENB
69
3.2-0.0
PLLDAT
0.0
PLLDAT
70
3.2-0.0
PLLCLK
0.0
PLLCLK
71
3.3
TX_CONT
0.1
TX_CONT
72
0.0
3.6
73
3.5-0.0
WD_OUT
3.5-0.0
WD_OUT
74
0.0
DGND
0.0
DGND
75
3.7
DVcc
3.7
DVcc
76
3.7
3.7
77
0.0
0.0
78
0.0
0.0
79
3.7
BELL_IN
3.7
BELL_IN
80
0.0
TALK
3.5
TALK
IC4
81
3.7
3.7
82
0.0
0.0
83
0.0
0.0
84
0.0
0.0
85
0.0
0.0
86
0.0
0.0
87
0.0
0.0
88
0.0
0.0
89
0.0
0.0
90
0.0
0.0
91
0.0
0.0
92
0.0
DGND
0.0
DGND
93
3.7
DVcc
3.7
DVcc
94
3.7
3.7
95
3.7
3.7
96
3.5
CHG_OUT
0.0
CHG_OUT
97
3.7
3.7
98
3.7
3.7
99
3.5
3.5
100
2.4
2.4
1
0.0
0.0
IC5
2
0.0
0.0
3
0.0
GND
0.0
GND
4
0.6
0.6
1
0.0
CLE(GND)
0.0
CLE(GND)
2
0.0
0.0
IC6
3
0.0
0.0
4
3.9
3.9
5
3.8
3.8
Summary of Contents for FT-8981
Page 1: ...SERVICE MANUAL PUBLISHED IN JAPAN May 2001 FILE NO 2B0 200104 FT 8981 CORDLESS TELEPHONE ...
Page 9: ... 8 BLOCK DIAGRAMS Base Unit ...
Page 10: ... 9 Handset ...
Page 12: ...Handset 12 13 FT8981 Sche p65 01 05 25 13 21 Page 9 Adobe PageMaker 6 5J Win ...
Page 27: ... 28 ELECTRICAL PARTS LOCATION Base Unit Main PCB ...
Page 28: ... 29 Handset Main PCB ...
Page 29: ... 30 WIRING DIAGRAMS Base Unit ...
Page 30: ... 31 Handset ...