Brother Facsimile Equipment MFC7420 manuals

Brother Facsimile Equipment MFC7420 User Manual (327 pages)

Brand: Brother | Category: Faxes | Size: 7.67 MB |

English

Table of contents

SERVICE MANUAL

1

PREFACE

3

HOW THIS MANUAL IS ORGANIZED

3

TABLE OF CONTENTS

5

SAFETY PRECAUTIONS

11

CHOOSING A LOCATION

13

CHAPTER

14

CONTENTS

15

1.1 EQUIPMENT OUTLINE

16

1.2 CONTROL PANEL

17

1.3 COMPONENTS

19

CHAPTER 2 SPECIFICATIONS

21

2.1 GENERAL

22

2-2 Confidential

23

2.1.2 Paper Specifications

23

Paper Tray

23

2-3 Confidential

24

2-4 Confidential

25

2.1.3 Printable Area

25

2-5 Confidential

26

Landscape

27

2-7 Confidential

28

2.2 SPECIFICATIONS LIST

29

2-9 Confidential

30

2-10 Confidential

31

2-11 Confidential

32

2-12 Confidential

33

2-13 Confidential

34

2-14 Confidential

35

2-15 Confidential

36

2-16 Confidential

37

2-17 Confidential

38

(10/15)

38

2-18 Confidential

39

(11/15)

39

2-19 Confidential

40

(12/15)

40

2-20 Confidential

41

(13/15)

41

2-21 Confidential

42

(14/15)

42

(15/15)

43

3.1 OVERVIEW

46

3.2 MECHANICAL COMPONENTS

47

3.2.1 Scanner Mechanism

48

3.2.2 Printing Mechanism

51

3.2.2.1 Paper supply

51

<“A” arrow view>

52

3.2.2.3 Paper registration

55

3.2.2.6 Toner cartridge

57

 Toner life end mode

57

 Exposure stage

60

3.2.3 Sensors and Actuators

63

TO BE SENT FOR REPAIR

66

5.1 DISASSEMBLY/REASSEMBLY

72

5.1.1 AC Cord

76

5.1.3 Paper Tray

77

(1) Remove the rear cover

78

(1) Open the front cover

80

5.1.8 ADF unit

82

(12) Close the ADF unit

85

(38) Open the ADF unit

93

(1) Open the scanner unit

96

(2) Release the four hooks

97

(7) Remove the rubber key

99

Confidential

100

NCU shield plate

101

PCB ASSY

102

5.1.15 Front Cover

107

(5) Remove the bush F/R

111

5.1.17 Fixing Unit

113

(8) Remove the heat roller

115

(10) Remove the HR gear

117

5.1.19 Main PCB

120

< MFC7820N >

121

5.1.20 PS PCB Unit

122

(3) Remove the laser unit

125

5.1.24 Tail Edge Actuator

129

(2) Remove the base plate

131

5.1.31 New Toner Sensor

133

5.1.32 Cover Sensor

134

5.1.34 Main Motor ASSY

135

5.1.35 Develop Joint

136

5.1.37 F/R Solenoid ASSY

137

5.1.38 Main Frame L

139

5.1.39 Main Frame R

140

Laser unit

141

FG harness ASSY 6

142

Regist sensor PCB ASSY

142

Fan motor 60 unit

143

Toner LED PCB ASSY

143

Toner sensor PCB ASSY

144

Panel unit

145

ADF unit

146

Document scanner

146

NCU FG harness

147

Speaker ASSY

148

5.2 LUBRICATION

149

151

UNIT ASSY

153

CHAPTER 7 CLEANING

155

MAINTENANCE MODE

156

CHAPTER 8 MAINTENANCE MODE

157

8-1 Confidential

158

8-2 Confidential

159

Stop/Exit key

160

Menu/Set key

160

8-4 Confidential

161

DCP7010/7020/7025

161

8.4 DETAILED DESCRIPTION OF

162

MAINTENANCE-MODE FUNCTIONS

162

8-7 Confidential

164

8-11 Confidential

168

 Function

168

8-12 Confidential

169

 Operating Procedure

169

MFC7420/7820N

169

8-13 Confidential

170

8-15 Confidential

172

Configuration List

172

8-19 Confidential

176

Cover page sample

178

End page sample

178

8-23 Confidential

180

8-27 Confidential

184

9.1 ERROR INDICATION

189

Confidential

190

within 11 second.)

193

within 15 second.)

193

9.2 TROUBLESHOOTING

203

[ 4 ] Image defects

215

Laser scanner unit assy

218

Interlock lever

218

All black

219

Dirt on the back of paper

220

I-9 White vertical streaks

223

I-11 Faulty registration

224

I-12 Poor fixing

225

I-13 Image distortion

226

I-15 White spots

227

CAUTION:

228

I-16 Black spots

229

Black band

230

Gray background

231

Hollow print

232

Horizontal lines

233

SERIAL NUMBERING SYSTEM

249

(2) Laser unit serial label

250

MACHINE

252

App. 2-2 Confidential

253

If you use USB cable

254

Click Next to proceed

255

(10) Click Next

256

(11) To proceed, click Yes

256

App. 2-6 Confidential

257

App. 2-7 Confidential

258

App. 2-8 Confidential

259

App. 2-9 Confidential

260

EEPROM CUSTOMIZING CODES

262

App. 4-1 Confidential

264

App. 4-2 Confidential

265

(Dial pulse setting)

266

(Tone signal setting)

267

App. 4-5 Confidential

268

(TRANSFER facility setting)

269

App. 4-7 Confidential

270

App. 4-8 Confidential

271

App. 4-9 Confidential

272

App. 4-10 Confidential

273

(Dial tone setting 1)

274

(Dial tone setting 2)

275

App. 4-13 Confidential

276

App. 4-14 Confidential

277

(Busy tone setting)

278

App. 4-16 Confidential

279

(Modem setting)

280

(AUTO ANS facility setting)

281

App. 4-19 Confidential

282

(Function setting 1)

283

(Function setting 2)

284

(Function setting 3)

285

(Transmission speed setting)

286

App. 4-24 Confidential

287

App. 4-25 Confidential

288

WSW21 (TAD setting 1)

288

App. 4-26 Confidential

289

(Communications setting)

290

App. 4-28 Confidential

291

(TAD setting 3)

292

App. 4-30 Confidential

293

App. 4-31 Confidential

294

(Function setting 6)

295

App. 4-33 Confidential

296

(Function setting 8)

297

App. 4-35 Confidential

298

(Function setting 10)

299

(Function setting 11)

300

App. 4-38 Confidential

301

(Function setting 13)

302

App. 4-40 Confidential

303

App. 4-41 Confidential

304

WSW37 (Function setting 15)

304

App. 4-42 Confidential

305

(V.34 transmission speed)

306

(V.34 modem settings)

307

App. 4-46 Confidential

309

(Function setting 21)

310

 Selector 8: JPEG coding

310

Speeding up scanning-1)

311

App. 4-49 Confidential

312

App. 4-50 Confidential

313

App. 4-51 Confidential

314

App. 4-52 Confidential

315

App. 4-53 Confidential

316

(Function setting 16)

317

Confidential

319

A. NCU PCB: MFC7420

321

A. NCU PCB: MFC7820N

322

A. NCU PCB:MFC7420

323

B. Power Supply PCB 100V

325

B. Power Supply PCB 200V

326

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