![Brother HL 2030 Service Manual Download Page 64](http://html.mh-extra.com/html/brother/hl-2030/hl-2030_service-manual_55555064.webp)
CHAPTER 3 THEORY OF OPERATION
Confidential
3-4
< HL-2070N >
DATA[0]
DATA[1]
DATA[2]
DATA[3]
DATA[4]
DATA[5]
DATA[6]
DATA[7]
DATA[8]
DATA[9]
DATA[10]
DATA[11]
DATA[12]
DATA[13]
DATA[14]
DATA[15]
ADR[12]
ADR[13]
ADR[14]
ADR[15]
ADR[16]
ADR[17]
ADR[18]
ADR[19]
ADR[20]
ADR[21]
ADR[1]
ADR[2]
ADR[3]
ANALOG
ANALOG
ANALOG
ANALOG
ANALOG
ANALOG
ADR[23]
ADR[22]
ADR[8]
ADR[9]
ADR[10]
ADR[4]
ADR[5]
ADR[6]
ADR[7]
ADR[11]
TP156
0V
VDD3
R87
33k
VDD3
R116
180
2-1D/2-4F/2-4D
ADR[23-1]
2-4D
SDCSN0
2-4D
SDCLK0
2-5C/2-7D
ROMCSN0
2-1B/2-5D/2-7D
IORDN
0V
C91
0
C79
C10P
R78
3.3k
R74
100
X3
AT-49 33.333333MHZ
1
2
TP103
0V
C18
C5P
R11
4.7k
R12
100
TP10
X2
AT-49 48.00MHZ
1
2
C17
C5P
3-4D
SCAN_CTL
3-6C
SCANNER_FGS
3-6C
MAIN_CTL
3-7C
MAIN_F/R
3-8E
MAIN_FGS2
3E
USBVCC
2-1B/2-5C
IOWEN
5F
DBRXD
5F
DBTXD
3-5F
FAN12V
3-5F
FAN24V
2-1E/2-4F
DATA[15-0]
PI1
SG-206S
A
K
E
C
3D
VBDN
3-1A
HEATERON
3-1A
RLYOFFN
3-1A
HTLIMITN
3-2F
PNLLED0
3-2F
PNLLED1
3-2F
PNLLED2
3-2F
PNLLED3
3-2E
SOL1
3-2E
SOL2
3-2D
HVPWMDEV
3-2D
HVPWMTRCV
3-2D
HVPWMTRCC
3-2D
HVPWMCHG
3-2B
REG_FRONT_SEN
3-2D
REG_REAR_SEN
3-2F
FRONT_COVER_SEN
3-2F
PNEW_SEN
3-2B
PEDG_SEN
3-2F
PNLSW0
3-2B
THM1
3-2C
FB_TR
3-2C
FB_TRCCV
3-2C
FB_GRID
3-2C
FB_DEV
3-2C
FB_VCLN
R85
10k
R153
10k
R150
10k
R146
10k
VDD3
R86
10k
R151
10k
R148
10k
0V
TP150
TP223
TP208
TP146
TP145
TP148
TP127
TP149
TP151
TP152
TP153
TP206
TP154
TP195
TP112
TP134
TP138
TP125
TP166
TP162
TP158
TP113
TP171
TP179
TP175
TP183
TP170
TP178
TP174
TP182
TP169
TP176
TP173
TP181
TP168
TP177
TP172
TP180
TP123
TP107
TP100
TP115
TP124
TP48
TP37
3-2C
GRIDC
VDD3
TP54
3-5A/3-7A
SENSE
TP70
3-8C
MAIN_FGS
3-7C
MAIN_START
3-2C
TNR_SEN
0V
C16
C22P
C15
C22P
TP9
R9
1k
R10
3.3k
3-3B
TNRLED
2-1B
LAN_INT
6F
PHRXD
5F
PHTXD
2-1B
LAN_RST
2-1A
LAN_CSN
TP95
TP108
TP88
R40
10k
R47
10k
@R43
10k
2-5A
CDCC_RSTN
2-5B
CDCC_DATA
2-5B
CDCC_REQN
2-5A
CDCC_INTN
2-5B
CDCC_CLK
0V
0V
0V
0V
0V
TP44
TP28
TP25
TP46
TP50
TP41
TP35
TP36
TP47
TP26
TP45
TP34
TP27
0V
VDD1.9
0V
TP19
VDD3
VDD3
0V
0V
0V
VDD3
VDD3
C45
C103
C34
C103
C29
C103
VDD3
VDD3
0V
@SW1
123
0V
TP72
C22
C103
C58
C103
0V
C69
C103
C106
C103
C105
C103
C21
C103
C24
C103
C71
C103
C40
C103
C25
C103
C23
C103
C108
C103
C47
C103
C107
C103
C82
C103
0V
C111
C103
C109
C103
VDD3
VDD1.9
C28
C103
C110
C103
C26
C103
C83
C103
TP118
TP114
VDD3
R19
0
R21
0
0V
TP17
TP20
TP61
TP64
TP58
0V
R139
10k
R137
10k
R136
10k
R135
10k
R144
10k
R142
10k
R141
10k
0V
R114
10k
R134
10k
U6
MB87S1200
DATA0
30
DATA1
31
DATA2
32
DATA3
33
DATA4
34
DATA5
35
DATA6
36
DATA7
37
DATA8
38
DATA9
39
DATA10
40
DATA11
41
DATA12
42
DATA13
43
DATA14
44
DATA15
45
EXINTN0
205
EXINTN1
201
SCKOUT
161
SCKIN
159
SSCG0
166
SSCG1
167
SDBKUPN
214
DBRXD
131
PHRXD
186
VCKOUT
58
VCKIN
56
VBDN
118
PNLSW0/PNLDIN
73
UCKOUT
155
UCKIN
157
USBVCC
173
HTLIMITN
54
TNRLED
71
ADR1
2
ADR2
3
ADR3
4
ADR4
5
ADR5
6
ADR6
7
ADR7
8
ADR8
9
ADR9
10
ADR10
11
ADR11
12
ADR12
16
ADR13
17
ADR14/BA0
18
ADR15/BA1
19
ADR16/RASN
20
ADR17/CASN
21
ADR18/WEN
22
ADR19/DQM0
23
ADR20/DQM1
24
ADR21
25
ADR22
26
ADR23
27
LANRST
207
MDMRSTN
203
ROMCSN0
211
ROMCSN1
210
EXCSN0
206
EXCSN1
202
EXCSN2
204
IOWEN
209
IORDN
208
SDCLK0
216
SDCSN0
215
SDCKE
213
DBTXD
132
PHTXD
187
PNLLED0/PNLRSTN
74
PNLLED1/PNLCLK
75
PNLLED2/PNLDO
76
PNLLED3
77
HEATERON
52
RLYOFFN
53
FAN12V
51
FAN24V
50
MB87S1200
U6
SEN0
70
SEN1
69
SEN2
68
SEN3
67
SEN4
49
REV0
72
REV1
64
SCANFGS
88
DCFGS
62
HVNOISE
86
HSRXD
180
HSCTS
182
NCU2ADLC
146
NCU2POL
149
NCU2DPS
148
NCU2CHRG
147
NCUPLS
153
NCURNG
176
NCUCI
152
TELOFF
175
HOOK
145
FSEN
121
RSEN
120
AI8
102
AI9
103
VRH
105
VRL
107
VIN1
106
PORT00
185
PORT01
63
PORT02
184
PORT03
183
PORT04/CDCCRSTN
195
PORT05/CDCCDATA
196
PORT06/CDCCREQN
197
PORT07/CDCCINTN
198
PORT08/CDCCCLK
199
SCANCTL
89
DCCTL
61
DCFR
60
SOL1
66
SOL2
65
HVVCLN
84
HVPWMVCLN
87
HVPWMDEV
85
HVPWMTRCV
81
HVPWMTRCC
82
HVPWMCHG
83
HSTXD
179
HSRTS
181
TELVOLPWMR
150
TELVOLPWMS
151
SPVOLPWM
178
NCURING
177
RMOTSEL
128
RMOT1
122
RMOT2
123
RMOT3
124
RMOT4
125
RMPT1
126
RMPT2
127
CISTG
142
CISCLK
141
PWMREFH
90
PWMREFL
91
RDLED
140
CISLEDR
137
CISLEDG
138
CISLEDB
139
CISON
144
CISMODE
143
CISCLMP
136
U6
MB87S1200
RCKOUT
110
RCKIN
112
RTCRSTN
109
AI0
94
AI1
95
AI2
96
AI3
97
AI4
98
AI5
99
AI6
100
AI7
101
VPD
192
TESPTN
165
XTST
191
TSTDATA
190
TSTMODEN
189
RVDD
111
SSCGVDD
163
SSCGVSS
164
VDDI15
15
VDDI48
48
VDDI59
59
VDDI80
80
VDDI116
116
VDDI135
135
VDDI154
154
VDDI174
174
VDDI194
194
VDDE1
1
VDDE13
13
VDDE28
28
VDDE46
46
VDDE55
55
VDDE78
78
VDDE115
115
VDDE133
133
VDDE158
158
VDDE162
162
VDDE171
171
VDDE200
200
VSS14
14
VSS29
29
VSS47
47
VSS57
57
VSS79
79
VSS113
113
VSS134
134
VSS156
156
VSS160
160
VSS168
168
VSS188
188
VSS212
212
AVDD
93
AVSS
92
AVDDH
104
AVSSH
108
0V
L1
(1608)
C3
C103
0V
X1
AT-49 16.6666MHZ
1
2
0V
0V
0V
L2
(1608)
0
TP22
R83
10k
VDD3
TP126
R158
68
VDD3
R72
33
TP98
TP227
TP106
TP97
VDD3
R157
10k
TP105
R76
33
R75
33
TP121
TP111
R30
5.6k
R35
0
R38
1
R41
1
TP63
TP82
TP78
TP73
C44
C101
C50
C102
C51
C102
C41
C104
0V
R27
0
3-2D
HVPWMVCLN
C39
C104
R82
33
R81
33
TP117
L4
0
L5
0
TP245
TP246
NC
VDD3
VDD3
@R169 10k
0V
Ic=3.3V/33k
=97
A
H:CLOSE
L:OPEN
EJECT SENSOR
48.00MHz
XTAL
If=(3.3V-1.2V)/180
=11.7mA
P=(11.7mA)^2*180
=1/41W
RESET=H
ACTIVE=H
66.6666MHz
or
16.6666MHz
XTAL
33.3333MHz
XTAL
5Vtol
RST:H
I/O
5Vtol
I/O
PullD
I/O
5Vtol
I/O
5Vtol
5Vtol
PullD
PullD
PullU
PullU
PullU
PullU
5Vtol
Fig. 3-4