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Sensor Operational Check, key for machines w/o fax

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3.8 Sensor Operational Check n Function This function allows you to check whether the eight sensors--document front sensor, document rear sensor, cover sensor, registration sensor, toner sensor, paper ejection sensor, manual insertion sensor, and cassette sensor--operate correctly. n Operating Procedure (1) Press the 3 and 2 keys in this order in the initial stage of the maintenance mode. The machine beeps 1100 Hz and 400 Hz tones cyclically through the following volumes for testing the speaker. NOTE: For models w/ fax: To stop beeping, press the Function/Menu key. For models w/o fax: To stop beeping, press the Menu key. If the sensing status are as listed below, the LCD will show the following: "DFDRCVRSTNPOFHR2" and "MNCSC2" (which can be switched by pressing the Start key for machines w/ fax or the Sort key for machines w/o fax) Given below is the relationship between the LCD indication, sensor names and sensor status. LCD Sensors Sensing status DF Document front sensor DR Document rear sensor CV Cover sensor RS Registration sensor TN Toner sensor PO Paper ejection sensor FH CCD HP sensor R2 2nd registration sensor* No document detected. No document detected. Front cover closed. No paper detected. No toner detected. No paper jam. CCD placed in home position No paper detected. MN Manual insertion sensor CS Cassette sensor C2 2nd cassette sensor* No paper detected. No paper cassette loaded. No paper cassette loaded. (*These error indications will always be displayed in models not equipped with a 2nd paper cassette.) (2) Change the detecting conditions (e.g., insert paper through the document sensors or the registration sensor(s), open the front cover, remove the toner cartridge, jam paper at the paper outlet, insert paper manually through the paper slot, and load the paper cassette(s)), and then check that the indication on the LCD changes according to the sensor states. (3) To stop this operation and return the machine to the initial stage of the maintenance mode, press the Stop key. NOTE: If you have opened and closed the front cover during the above procedure, you need to open and close the front cover again upon completion of the procedure. V - 56

Section	Page
DCP1200, MFC9600, MFC9750, MFC9850, MFC9870 Parts and Service Manual.pdf	1
CHAPTER I. GENERAL DESCRIPTION	6
1. MACHINE OUTLINE	7
1.1 External Appearance and Weight	7
1.2 Components	7
2. SPECIFICATIONS	8
CHAPTER II. INSTALLATION	27
1. INSTALLING THE UPDATE DATA TO THE	28
CHAPTER III. THEORY OF OPERATION	31
1. OVERVIEW	32
2. MECHANISMS	33
2.1 Scanner Mechanism	34
2.2 Laser Printing Mechanism	36
2.2.1 Paper pick-up and registration mechanism	36
2.2.2 Print process mechanism	37
2.2.3 Heat-fixing mechanism	39
2.2.4 Paper ejecting mechanism	40
2.3 Sensors and Actuators	41
3. CONTROL ELECTRONICS	43
CHAPTER IV. DISASSEMBLY/REASSEMBLY AND	45
1. DISASSEMBLY/REASSEMBLY	47
Safety Precautions	47
Preparation	48
How to Access the Object Component	48
Disassembly Order Flow	49
1.1 Lower Rear Cover	50
1.2 Access Plates R and F	50
1.3 Paper Cassette	51
1.4 Document Tray ASSY	52
1.5 Upper Rear Cover	54
1.6 ADF Unit	55
1.7 Scanner Unit and Control Panel ASSY	62
1.8 Relay PCB	71
1.9 Speaker	72
1.10 Scanner Mount	73
1.11 Paper Sub Tray and Tray Holder	76
1.12 VC Cover, VC Bracket, and VC Connector PCB (for models supporting	77
1.13 Front Cover	78
1.14 Outer Chute and Paper Pinch Rollers	79
1.15 Main Cover	80
1.16 Switch Cover (for models not equipped with a power switch)	81
1.17 Laser Unit	82
1.18 Heat-fixing Unit and FU Lamp	83
1.19 Fan	87
1.20 Drive Gear ASSY and Main Motor ASSY	89
1.21 NCU Shield and NCU PCB*	91
1.22 Bottom Plate, Main PCB, and Bottom Insulation Film	93
1.23 Low-voltage Power Supply PCB and Power Inlet	97
1.24 Inner Insulation Film, High-voltage Power Supply PCB, Engine PCB,	99
1.25 Toner Sensor (light-receiver) PCB and Toner Sensor (LED) PCB	101
1.26 Gears and Paper Pick-up Roller	102
1.27 Paper Feed Roller ASSY	103
1.28 Clutch Levers, Cassette Guide L, and Solenoid	104
1.29 Cleaning of High-voltage Contacts and Grounding Contacts	105
2. LUBRICATION	107
[ 1 ] ADF unit	107
[ 2 ] Scanner mount	108
[ 3 ] Drive gear ASSY	109
[ 4 ] Paper cassette	110
CHAPTER V. MAINTENANCE MODE	112
1. ENTRY INTO THE MAINTENANCE MODE	113
2. LIST OF MAINTENANCE-MODE FUNCTIONS	114
3. DETAILED DESCRIPTION OF	116
3.1 EEPROM Parameter Initialization	116
3.2 Printout of Scanning Compensation Data	117
3.3 ADF Performance Test	119
3.4 Test Pattern 1	120
3.5 Firmware Switch Setting and Printout	121
[ A ] Firmware switch setting	121
[ B ] Printout of firmware switch data	165
3.6 Operational Check of LCD	166
3.7 Operational Check of Control Panel PCB	166
3.8 Sensor Operational Check	168
3.9 CCD Scanner Area Setting	169
3.10 EEPROM Customizing	169
3.11 Erasure of Received FAX Messages Temporarily Stored in the Flash Memory (Not applicable	170
3.12 Machine Error Code Indication	170
3.13 Output of Transmission Log to the Telephone Line (Not applicable to machines w/o fax)	171
3.14 Cancellation of the Memory Security Mode (Not applicable to the American versions and	171
CHAPTER VI. ERROR INDICATION AND TROUBLESHOOTING	173
1. ERROR INDICATION	174
1.1 Machine Errors	174
[ 1 ] Error messages on the LCD	174
[ 2 ] Error codes shown in the \	177
1.2 Communications Errors (Not applicable to machines w/o fax)	179
2. TROUBLESHOOTING	189
2.1 Introduction	189
2.2 Precautions	189
2.3 Checking prior to Troubleshooting	189
2.4 Troubleshooting Procedures	191
[ 1 ] Control panel related	191
[ 2 ] Telephone related	191
[ 3 ] Communications related	192
[ 4 ] Paper/document feeding related	192
[ 5 ] Print-image related	193
[ 6 ] PC-driven or video capture-driven printing	199
Location of High-voltage Contacts and Grounding Contacts	200
Appendix 1. EEPROM Customizing Codes	202
Appendix 2. Circuit Diagrams	205
A. Main PCB	206
B. Engine PCB	213
C. NCU PCB	214
D. Control Panel PCB	218
E. Relay PCB	221
F. Power Supply PCB	222
pl_mfc9750_9850_9870.pdf	226
List1(MAIN FRAME)	229
List2(LASER UNIT)	231
List3(PAPER TRANSPORT)	233
List4(PAPER CASSETTE)	235
List5(HEAT FIXING UNIT)	237
List6(COVER)	239
List7(SCANNER UNIT)	241
List8(ADF&TRAY)	243
List9(CONTROL PANEL MFC9750)	245
List9(C PANEL MFC9850 9870)	247
List10(PCB ASSY)	249
List11(ACCESSORIES)	251
List12(PRINTED MATERIAL)	253
List13(CARTON)	255
DCP1200pc.pdf	257
List1(MAIN FRAME)	260
List2(LASER UNIT)	262
List3(PAPER TRANSPORT)	264
List4(PAPER CASSETTE)	266
List5(HEAT FIXING UNIT)	268
List6(COVER)	270
List7(SCANNER UNIT)	272
List8(ADF&TRAY)	274
List9(CONTROL PANEL DCP1200)	276
List9(CONTROL PANEL MFC9600)	278
List10(PCB ASSY)	280
List11(ACCESSORIES)	282
List12(PRINTED MATERIAL)	284

Match case Limit results 1 per page

- 56

3.8

Sensor Operational Check

Function

This function allows you to check whether the eight sensors--document front sensor, document

rear sensor, cover sensor, registration sensor, toner sensor, paper ejection sensor, manual

insertion sensor, and cassette sensor--operate correctly.

Operating Procedure

(1)

Press the

and

keys in this order in the initial stage of the maintenance mode.

The

machine beeps 1100 Hz and 400 Hz tones cyclically through the following volumes for testing

the speaker.

NOTE:

For models w/ fax:

To stop beeping, press the

Function/Menu

key.

For models w/o fax:

To stop beeping, press the

key.

If the sensing status are as listed below, the LCD will show the following:

"DFDRCVRSTNPOFHR2" and "MNCSC2" (which can be switched by pressing the

Start

key for machines w/ fax or the

Sort

key for machines w/o fax)

Given below is the relationship between the LCD indication, sensor names and sensor status.

LCD

Sensors

Sensing status

Document front sensor

No document detected.

Document rear sensor

No document detected.

Cover sensor

Front cover closed.

Registration sensor

No paper detected.

Toner sensor

No toner detected.

Paper ejection sensor

No paper jam.

CCD HP sensor

CCD placed in home position

2nd registration sensor*

No paper detected.

Manual insertion sensor

No paper detected.

Cassette sensor

No paper cassette loaded.

2nd cassette sensor*

No paper cassette loaded.

(*These error indications will always be displayed in models not equipped with a 2nd paper cassette.)

(2)

Change the detecting conditions (e.g., insert paper through the document sensors or the

registration sensor(s), open the front cover, remove the toner cartridge, jam paper at the

paper outlet, insert paper manually through the paper slot, and load the paper cassette(s)),

and then check that the indication on the LCD changes according to the sensor states.

(3)

To stop this operation and return the machine to the initial stage of the maintenance mode,

press the

Stop

key.

NOTE:

If you have opened and closed the front cover during the above procedure, you need to

open and close the front cover again upon completion of the procedure.