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Manuals
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Epson Manuals
Printer
TM-L90 series
Service manual
Main Circuit Board (2 Of 3) (Drawing Number 2 - Epson TM-L90 series Service Manual
Epson tm-l90 series line-thermal printer
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:
Technical reference manual
(212 pages)
,
Developer's manual
(140 pages)
,
User manual
(112 pages)
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Contents
Table of Contents
Troubleshooting
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Table of Contents
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Confidential
Main Circuit Board (2 of 3) (Drawing Number 2)
A1
1
A1
A2
1
A2
A3
1
A3
A4
1
A4
A5
1
A5
A6
1
A6
A7
1
A7
A8
1
A8
A9
1
A9
A10
1
A10
A11
1
A11
A12
1
A12
A13
1
A13
A14
1
A14
A15
1
A15
A16
1
A16
A17
1
A17
A18
1
A18
A19
1
A19
A20
1
A20
A21
1
A21
nPGMCE
1
nPGMCE
nFNTCE
1
nFNTCE
nRD
1
nRD
nWR
1
nWR
nLCAS
1
nLCAS
nHCAS
1
nHCAS
nRAS2
1
nRAS2
D0
1
D0
D1
1
D1
D2
1
D2
D3
1
D3
D4
1
D4
D5
1
D5
D6
1
D6
D7
1
D7
D8
1
D8
D9
1
D9
D10
1
D10
D11
1
D11
D12
1
D12
D13
1
D13
D14
1
D14
D15
1
D15
Rev.B
VBUS
U7
A16
1
A15
A15
2
A14
A14
3
A13
A13
4
A12
A12
5
A11
A11
6
A10
A10
7
A9
A9
8
A8
A20
R89
1
2
9
A19
A21
10
NC/A20
nWR
11
WE
12
RESET
13
NC
BLOCK(7)
14
WP/ACC
R92
1
2
15
RY/BY
A19
16
A18
A18
17
A17
A8
18
A7
A7
19
A6
A6
20
A5
A5
21
A4
A4
22
A3
A3
23
A2
A2
24
A1
VBUS
U9
A16
1
A15
A15
2
A14
A14
3
A13
A13
4
A12
A12
5
A11
A11
6
A10
A10
7
A9
A9
BLOCK(8)
8
A8
A20
R94
1
2
9
A19
A21
10
NC/A20
nWR
11
WE
12
RESET
13
NC
14
WP/ACC
R95
1
2
15
RY/BY
A19
16
A18
A18
17
A17
A8
18
A7
A7
19
A6
A6
20
A5
A5
21
A4
A4
22
A3
A3
23
A2
A2
24
A1
VBUS
VBUS
C43
2
1
2
1
C44
48
A17
A16
47
BYTE
D0
46
VSS2
D15
D1
45
D15/A-1
D7
D2
44
D7
D14
D3
43
D14
D6
42
D6
D13
D4
41
D13
40
D5
D5
D5
D12
D6
39
D12
38
D4
D7
D4
37
VCC
D11
36
D11
D3
35
D3
D10
34
D10
33
D2
nWR
D2
D9
nRAS2
32
D9
31
D1
D1
D8
30
A1
D8
D0
A2
29
D0
nRD
A3
28
OE
A4
27
VSS1
26
nPGMCE
CE
25
A1
A0
VBUS
C502
N
P
C47
2
1
2
1
C48
A17
48
A16
1
47
BYTE
46
VSS2
D15
45
D15/A-1
D7
44
D7
D14
43
D14
D6
42
D6
D13
41
D13
40
D5
D5
39
D12
D12
D4
38
D4
37
VCC
D11
36
D11
D3
35
D3
D10
34
D10
33
D2
D2
32
D9
D9
D1
31
D1
D8
30
D8
D0
29
D0
nRD
28
OE
27
VSS1
26
nFNTCE
CE
25
A1
A0
BLOCK(12)
P
N
C501
1
2
C45
C46
1
2
U8
1
44
VCC
VSS
D15
2
43
D0
D15
D14
3
42
D1
D14
D13
4
41
D2
D13
D12
5
40
D3
D12
6
39
VCC
VSS
D11
7
38
D4
D11
8
37
D10
D5
D10
D9
9
36
D6
D9
10
35
D8
R90
D7
D8
13
32
NC
NC
14
31
NC
LCAS
15
30
WE
UCAS
nRD
16
29
RAS
OE
17
28
A9
NC
A8
A8
18
27
A0
A7
A7
19
26
A1
A6
A6
20
25
A2
A5
A5
21
24
A3
A4
22
23
VCC
VSS
VIO
Memory
Rewrite
R93
DSW2
DSWMEM
1
2
DSWMEM
TM-L90 Service Manual
VBUS
R91
nLCAS
nHCAS
Appendix F-13
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Table of Contents
Troubleshooting
Chapter 2 Troubleshooting Guide
14
Troubleshooting Using the ERROR LED
18
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