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Brother International MFC 8500 Service Manual - Page 127

Sensor Operational Check, DFDRCVRSTNPOHK, MNCS P2

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3.9 Sensor Operational Check n Function This function allows you to check whether the 12 sensors (11 sensors on European models)-document front sensor, document rear sensor, cover sensor, registration sensor, toner sensor, paper ejection sensor, hook switch*, 2nd registration sensor**, manual insertion sensor, cassette sensor, 2nd cassette sensor**, and jam sensor--operate correctly. (*European models have no hook switch.) (**These sensors are provided for models supporting a 2nd paper cassette.) n Operating Procedure (1) Press the 3 and 2 keys in this order in the initial stage of the maintenance mode. The equipment beeps 1100 Hz and 400 Hz tones cyclically through the following volumes for testing the speaker. NOTE: To stop beeping, press the Menu key. If the sensing status are as listed below, the LCD will show the following two character strings which can be switched by pressing the Fax Start key: American models "DFDRCVRSTNPOHK " and "MNCS P2" "DFDRCVRSTNPOHKR2" and "MNCSC2P2" on models having a 2nd paper cassette European models "DFDRCVRSTNPO " and "MNCS P2" "DFDRCVRSTNPO R2" and "MNCSC2P2" on models having a 2nd paper cassette 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 HK Hook switch* R2 2nd registration sensor** MN Manual insertion sensor CS Cassette sensor C2 2nd cassette sensor** P2 Jam sensor No document detected. No document detected. Top cover closed. No paper detected. No toner detected. No paper jam. On-hook state. No paper detected. No paper detected. No paper cassette loaded. No paper cassette loaded. No paper jammed. (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 or inside the heat-fixing unit, lift up the handset*, and then check that the indication on the LCD changes according to the sensor states. (3) To stop this operation and return the equipment to the initial stage of the maintenance mode, press the Stop key. NOTE: If you have opened and closed the top cover during the above procedure, you need to open and close the front cover again upon completion of the procedure. V - 15

Section	Page
CHAPTER I. GENERAL DESCRIPTION	6
1. EQUIPMENT OUTLINE	7
1.1 External Appearance and Weight	7
1.2 Components	7
2. SPECIFICATIONS	8
CHAPTER II. INSTALLATION	21
1. INSTALLING THE UPDATE DATA TO THE FACSIMILE MACHINE	22
2. SETTING ID CODES TO FACSIMILE MACHINES	24
CHAPTER III. THEORY OF OPERATION	26
1. OVERVIEW	27
2. MECHANISMS	28
2.1 Scanner Mechanism	29
2.1.1 Document feeding and ejecting mechanism	29
2.1.2 Scanner	29
2.2 Laser Printing Mechanism	30
2.2.1 Paper pick-up and registration mechanism	30
2.2.2 Print process mechanism	31
(1) Charging process	32
(2) Exposing process	32
(3) Developing process	33
(4) Transferring process	33
2.2.3 Heat-fixing mechanism	34
2.2.4 Paper ejecting mechanism	35
2.3 Sensors and Actuators	36
3. CONTROL ELECTRONICS	38
CHAPTER IV. DISASSEMBLY/REASSEMBLY AND LUBRICATION	40
1. DISASSEMBLY/REASSEMBLY	42
Safety Precautions	42
Preparation	43
How to Access the Object Component	43
Disassembly Order Flow	44
1.1 Rear Cover	45
1.2 Access Plates R and F	45
1.3 Control Panel ASSY	46
1.4 Panel Rear Cover and Control Panel	47
1.5 Document Feed Roller ASSY, Document Ejection Roller ASSY, and Pinch Rollers	50
1.6 CIS Unit	51
1.7 Scanner Frame ASSY (Scanner Motor, Scanner Drive Unit, Document Take-in Roller,	52
1.8 Top Cover (Exit Roller, Speaker, and Document Guides)	56
1.9 Handset Mount and Hook Switch PCB (for models equipped with a handset)	62
1.10 Paper Sub Tray	64
1.11 VC Cover, VC Bracket, and VC Connector PCB (for models supporting video capture)	65
1.12 Front Cover	66
1.13 Outer Chute and Paper Pinch Rollers	67
1.14 Main Cover	68
1.15 Switch Cover	69
1.16 Laser Unit	70
1.17 Heat-fixing Unit and FU Lamp	71
[Disassembling the heat-fixing unit]	73
1.18 Fan	85
1.19 Drive Gear ASSY and Main Motor ASSY	87
1.20 NCU Shield and NCU PCB	89
1.21 Bottom Plate, Main PCB, and Bottom Insulation Film	91
1.22 Low-voltage Power Supply PCB and Power Inlet	95
1.23 Inner Insulation Film, High-voltage Power Supply PCB, Engine PCB, and 2nd Cassette Relay PCB*	97
1.24 Toner Sensor (light-receiver) PCB and Toner Sensor (LED) PCB	99
1.25 Gears and Paper Pick-up Roller	100
1.26 Paper Feed Roller ASSY	101
1.27 Clutch Levers, Cassette Guide L, and Solenoid	102
1.28 Paper Cassette	103
1.29 Cleaning of High-voltage Contacts and Grounding Contacts	104
2. LUBRICATION	106
[ 1 ] Document feed roller ASSY and document ejection roller ASSY	106
[ 2 ] Control panel locks	107
[ 3 ] Scanner frame ASSY, document take-in roller and its shaft, and separation roller and its shaft	107
[ 4 ] Top cover	108
[ 5 ] Drive gear ASSY	109
[ 6 ] 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 MAINTENANCE-MODE FUNCTIONS	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	123
3.6 Operational Check of LCD	124
3.7 Operational Check of Control Panel PCB	124
3.8 Receiver Volume Adjustment (applicable to the American version only)	126
3.9 Sensor Operational Check	127
3.10 Fine Adjustment of Scanning Start/End Position	128
3.11 CIS Scanner Area Setting	129
3.12 EEPROM Customizing	129
3.13 Display of the Equipment's Log Information	130
3.14 Equipment Error Code Indication	131
3.15 Output of Transmission Log to the Telephone Line	131
3.16 Cancellation of the Memory Security Mode (applicable to the European version only)	132
CHAPTER VI. ERROR INDICATION AND TROUBLESHOOTING	134
1. ERROR INDICATION	135
1.1 Equipment Errors	135
[ 1 ] Error messages on the LCD	135
[ 2 ] Error codes shown in the \	139
1.2 Communications Errors	141
2. TROUBLESHOOTING	151
2.1 Introduction	151
2.2 Precautions	151
2.3 Checking prior to Troubleshooting	151
2.4 Troubleshooting Procedures	153
[ 1 ] Control panel related	153
[ 2 ] Telephone related	153
[ 3 ] Communications related	154
[ 4 ] Paper/document feeding related	154
[ 5 ] Print-image related	155
Location of High-voltage Contacts and Grounding Contacts	162
Appendix 1. EEPROM Customizing Codes	164
Appendix 2. Firmware Switches (WSW)	167
Appendix 3. Circuit Diagrams	215
A. Main PCB (MFC8500)	216
B. Main PCB (MFC9660)	226
C. Engine PCB	227
D. NCU PCB	228
E. Control Panel PCB	232

Match case Limit results 1 per page

V -

3.9

Sensor Operational Check

Function

This function allows you to check whether the 12 sensors (11 sensors on European models)--

document front sensor, document rear sensor, cover sensor, registration sensor, toner sensor, paper

ejection sensor, hook switch*, 2nd registration sensor**, manual insertion sensor, cassette sensor,

2nd cassette sensor**, and jam sensor--operate correctly.

(*European models have no hook switch.)

(**These sensors are provided for models supporting a 2nd paper cassette.)

Operating Procedure

(1)

Press the

and

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

The

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

testing the speaker.

NOTE:

To stop beeping, press the

key.

If the sensing status are as listed below, the LCD will show the following two character strings

which can be switched by pressing the

Fax

Start

key:

American models

DFDRCVRSTNPOHK

" and "

MNCS P2

DFDRCVRSTNPOHKR2

" and "

MNCSC2P2

" on models having a 2nd paper cassette

European models

DFDRCVRSTNPO

" and "

MNCS P2

DFDRCVRSTNPO R2

" and "

MNCSC2P2

" on models having a 2nd paper cassette

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

Top cover closed.

Registration sensor

No paper detected.

Toner sensor

No toner detected.

Paper ejection sensor

No paper jam.

Hook switch*

On-hook state.

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.

Jam sensor

No paper jammed.

(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 or inside the heat-fixing unit, lift up the handset*, and then check that the indication on

the LCD changes according to the sensor states.

(3)

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

press the

Stop

key.

NOTE:

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

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