SAMSUNG ML7050XEF Service Manual
ML-7000 Series
ML-7050/7050N
SERVICE Manual
Laser printer |
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Contents |
1. Precautions
2. Reference Information
3. Product Information
4. Disassembly
5. Trouble Shooting
6. Exploded Views & Parts List 7.Electrical Parts List
8. Block Diagrams
9. PCB Diagrams
10. Port Thru
(Network Printer Card)
ELECTRONICS
Samsung Electronics Co., Ltd. September. 1999
Printed in Korea |
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VERSION NO. : 0.1 |
P/N. JC68-00260A |
Precautions
1. Precautions
1-1 Safety precautions
Read each caution carefully
1.Do not use the pinter near water or when exposed to inclement weather.
2.Do not place this printer on an unstable cart, stand or table, the product may fall, causing serious damage to the product.
3.Slots and openings on the cabinet are provided for ventilation. To ensure reliable operation and to protect the printer from overheation, do not block or cover any of these openings. Do not place the printer in an enclosure unless the enclosure providesadequate ventilation.
4.Never push any kind of objects into the printer through the cabinet ventilaition slots as they may touch dangerous hihg voltage points, create short circuits, cause a fire, or produce an electrical shock. Never spill any kind of liquid on the printer.
5.Do not place the printer in a lacation where someone may trip on the cord.
6.Select a work surface that is lartge enough to hold the printer.
7.Operate this printer using the power source (110V, 220V, etc) indicated on the marking label. If you are not sure of the type of power source available, consult your dealer or local power company.
8.If you need to use an extension power cord with this printer, make sure that is uses a threewire grounded cord and that the total ampere ratings for all of the products using the extension, do not exceed the extension cord ampere ration.
9.Do not allow anything to rest on th power cord or data communications cable.
10.Unplug this printer from the wall outlet before cleaning. Do not use liquid cleaners or aerosol sprays. Use a damp cloth for cleaning.
11.Do not touch the surface of the photo-sensitive drum as marks ro scratches may impair print quality.
12.Do not expose the drum unit to direct light for prolonged periods.
13.Use only standard papers, OHP films and approved envelopes.
Samsung Electronics |
1-1 |
PrecautionsReference
1-2 Laser Safety Statement
The printer is certified in the U.S to conform to the requirement of DHHS 21CFR Subchapter J for Class I(1) laser product, and elsewhere is certified as a class I laser product conforming to the requirement of IEC 825.
Class I laser product are not considered to be hazardous. The laser system and printer are designed so there is never any human assess to laser radiation above a Class I level during normal operation, user maintenance, or prescribed service condition
Caution : Never operate and service the printer with the protective cover removed from Laser Scanner
Assembly. The reflective beam, although invisible, can damage your eyes
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CAUTION - INVISIBLE LASER RADIATION WHEN THIS COVER OPEN. |
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DO NOT OPEN COVER |
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VORSICHT - UNSICHTBARE SASERSTRAHLUNG, WENN ABDECKUNG GEÖFFNET. |
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NICHT DEM STRAHL AUSSETZEN. |
ATTENTION |
- RAYONNEMENT LASER INVISIBLE EN CAS D’OUVERTURE, EXPOSITION DANGEREUSE |
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AU FAISCEAU. |
ATTENZIONE |
- RADIAZIONE LASER INVISIBLE IN CASO DI APETURA, EVITARE L’ESPOSIZIONE AL |
FASCIO.
PRECAUCION - RADIACION LASER IVISIBLE CUANDO SE ABRE, EVITAR EXPONERSE ALRAYO.
ADVARSEL |
- USTNLIG LASERSTRÄLNING VED ÄBNING, NÄR SIKKERHEDSBRYDERE ER UDE AF |
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FUNKTION, UNDGÄ UDSAETTELSE FOR STRÄLNING. |
ADVARSEL |
- USYNLIG LASERSTRÄLNING NÄR DEKSEL ÄPNES, STIRR IKKE INN I STRÄLEN, UNNGÄ |
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EKSPONERING FOR STRALEN. |
VARNING |
- OSYNLIG LASERSTRÄLNING NÄR DENNA DELÄR ÖPPNADOCH SPÄRREN ÄR |
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URKOPPLAD, BETRAKTA EJ STRÄLEN, STRÄLEN ÄR FARLIG. |
VARO! |
- AVATTAESSA JA SUOJALUKITUS OHITEETTAESSA OLET ALTTINA NÄKYMÄTTÖMÄLLE |
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LASER SÄTELYLLE ÄLÄ KATSO SÄTEESEEN. |
LSU caution label is located on the LSU top side
CLASS 1 LASER PRODUCT
LASER KLASSE 1
LUOKAN 1 LASERLAITE
APPAREIL A LASER DE CLASSE 1
TO IEC 825
1-2 |
Samsung Electronics |
Reference
2. Reference Information
2-1 Abbreviations and Acronyms
Tables 2-1 and 2-2 List abbreviations and acronyms which may be found in this service manual.
Table 2-1. Abbreviations
Abbv |
Definition |
Abbv |
Definition |
amps |
amperes |
lb |
pound(s) |
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lin |
linearity |
ass’y |
assembly |
lock |
bus lock |
badac |
bad assess |
mm |
millimeter(s) |
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neg |
negative |
bps |
bits per second |
od |
open drain |
clk |
clock |
OSC |
oscillator |
cm |
centimeter(s) |
OUT |
output |
CON |
connector |
PIC |
picture |
GND |
ground |
pos |
positive or position |
HLDA |
hold acknowledge |
pot |
potential |
HLDAR |
hold acknowledge received |
psynrq |
page synchronization request |
HLDR |
hold request |
pwr |
power |
HOR |
horizontal |
qty |
quantity |
in |
inch(es) or input |
sw |
switch |
INTA |
interrupt Acknowledge |
sync |
synchronous or |
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synchronization |
INT |
Interrupt |
tach |
tachometer |
INTR |
Interrupt request |
Vcc |
collector supply voltage(dc) |
I/O |
Input and Output |
vert |
vertical |
mpx |
multiplex |
Vp-p |
peak-to-peak voltage |
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VR |
variable resistor |
Samsung Electronics |
2-1 |
Product Information
3. Product Information
Item |
Descriptions |
Remarks |
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Samsung Electronics |
3-1 |
Product Information
Controller Specification
Item |
Descriptions |
Remarks |
’
Samsung Electronics
Disassembly
4. Disassembly
4-1 Front View
Control Panel
Cover Open
Power Switch
Cover Tray
Cover Front
Paper Level Indicator
4-2 Rear View
Cover Rear
Controller
Cassette
Power Inlet
Samsung Electronics |
4-1 |
Disassembly
4-3 Cabinet Disassembly
4-3-1. Cover Right
Remove the screws and open the
Cover Rear.
Cover Rear
Screw
Cover Right
Screw
In order to remove the Cover Right. Please see the hook which locks the cabinet to the frame, right hand should first grab the hook and pull it out for releasing the hook from the frame.
Hook
4-2 |
Samsung Electronics |
Disassembly
The left hand should slide the Cover Right to the backward.
Samsung Electronics |
4-3 |
Disassembly
4-3-2. Cover Left
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Remove screw and open the Cover |
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Rear. |
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Please see the hook of the Cover |
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Screw |
Left. Pull the Hook and release it |
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from the frame. |
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Hook
Slide the Cover Left to the backward with pulling the hook out.
The Cover Left can be easily removed.
Pull
4-4 |
Samsung Electronics |
Disassembly
4-3-3. Cover Front
Please see the MP tray disassembly. (4-9)
4-3-4. Cover Main
Cover Open
Open the Cover Open.
Remove two screws.
Cover Top
Screw |
Screw |
Cover Main
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See the hooks. |
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Up |
Push the hooks up and pull them |
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upward. |
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With holding Cover Main, remove the panel wire.
Samsung |
4-5 |
Disassembly
4-3-5. Cover Rear
Stripe
Cover Rear
Hinge
Open the Cover Rear.
Detach the stripe by pushing the stripe.
There is a hook holding the stripe.
After detaching the stripe from the Cover Rear,
Release the Cover Rear from the hinge.
4-6 |
Samsung Electronics |
Disassembly
4-4 Video Controller board & Joint board
After removing external cabinet, see the 5 screws and you should remove them.
The Shield ICU is important for EMI and protection for Controller.
Shield ICU
Joint Board |
Screw |
After removing Shield ICU, you can see the assembled controller. Unplug the panel cable and engine I/F cable with care and remove the screws from the frame.
Panel Cable
RAM Simm Socket
Controller Board
Engine I/F cable
Flash SIMM or
Frame ICU Postscript SiMM
Socket
Samsung Electronics |
4-7 |
Disassembly
Screw
Parallel I/F
Reserved for
Network
Reserved for
Serial
Screw
Video Controller Board
Remove the screws which hold the Bracket ICU to the frame and detach controller from the frame. You can see the Frame ICU.
CPU
Connector for Network
Hyper chip
ASIC (SPGP1)
4-8 |
Samsung Electronics |
Disassembly
4-5 Fuser Ass’y
Open the Cover Rear and see the screws and unscrew and remove the Cover pcb.
Screw
Cover pcb for engine B’d
After removing the Cover pcb, unplug the Thermistor connector from the Engine Board.
Thermistor
connector
Samsung Electronics |
4-9 |
Disassembly
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See the 4 screws which hold the |
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fuser ass'y to the frame. You |
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should unscrew and pull the fuser |
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out and it will be removed. |
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The AC connector for fuser is |
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designed to be directly connected |
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to the AC socket which is |
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positioned in the frame. |
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Screw |
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Screw |
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Screw |
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Screw |
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exit sensor actuator
< Fuser Ass’y >
4-10 |
Samsung Electronics |
Disassembly
When Jam happens, you can easily remove it by pulling the Guide Rear out like figure. In order to remove Guide Rear, opening the Guide Rear out like figure and pull out hinge of Guide Rear.
Guide Rear
Samsung Electronics |
4-11 |
Disassembly
4-6 Bracket Motor Ass’y & Cover Open Switch Unit
Bracket Motor Ass’y
Bracket Motor ass’y is located in the right-upper side. Remove 7 black screws and detach the ass’y from the frame and unplug the motor connector from the motor.
You can see the Bracket Motor ass’y. Motor and several gears are assembled in one gear bracket.
Motor
< Bracket Motor Ass’y >
4-12 |
Samsung Electronics |
Disassembly
After removing the Bracket Motor
Cover Open Switch unit ass’y, you can see the Cover Open Switch Unit.
Remove the SMPS. Refer to SMPS & Bracket
Duplex Ass’y disassembly (4-12) Detach two Connectors form the SMPS.
Remove 2 screws and detach the unit from the frame.
Samsung Electronics |
4-13 |
Disassembly |
4-7 Pickup Ass’y |
After running about more than 100,000 pages, the pickup ass’y may be needed to be replaced depending on feeding quality.
Remove the screw of Bracket Support and tension spring.
Pickup Ass’y
Tension Spring
Screw
Lift Guide Front Duplex and remove the 3 mounting screws of Pickup Ass’y.
Guide Front Duplex
Screws
4-14 |
Samsung Electronics |
Disassembly
4-8 Laser Scanner Unit
Cover Top
Cap-wire LSU
Laser Scanner Unit is located in the upper frame.
In order for LSU disassembling, disassemble the Cover Main, you should take off the left and right cover.
There is wiring protection cover(Cap Wire LSU)for LSU wires. Remove Cap wire LSU.
Samsung Electronics |
4-15 |
Disassembly
There are two wires for LSU. One is LSU motor and the other is Laser beam control. The wires are wire to wire types. You can easily disconnect the wires. After disconnection, unscrew and remove LSU.
4-16 |
Samsung Electronics |
Disassembly
4-9 Multi Purpose Tray
Remove the Cover main.
Hook
See the Links which hold the MP tray in the both side.
Hold the Links and pull it to the arrow direction.
Hold the MP tray and pull it to the arrow direction.
Samsung Electronics |
4-17 |
Disassembly
Screw
Hook
Cover Front
After detaching the Tray MP, see the screws and remove them. Remove the hook and release the Cover Front by releasing the hook.
4-18 |
Samsung Electronics |
Disassembly
Screw |
Screw |
Screw |
Screw |
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After removing Cover Front, detach the MP ass’y by unscrewing 4 screws.
Before detaching MP Ass’y, unplug the MP solenoid and MP sensor connector from the Joint Board.
< MP Ass'y >
Samsung Electronics |
4-19 |
Disassembly
4-10 Control Panel
LCD Ass’y |
Cover Top |
Cover Open
First lift up Cover Main and see the panel wire and disconnect the wire from the panel board. And next step is to remove the panel board which is located in the Cover Top.
Control panel consists of LCD ass’y and Key&LED ass’y. Remove Key&LED ass’y and remove LCD ass’y.
4-20 |
Samsung Electronics |
Disassembly
LCD Ass’y
Hook
Cover Top
Hinge
After removing Key&LED ass’y, release the hook of LCD ass'y from Cover Top and see the hinge for LCD ass’y in the cabinet and release them.
You should spread the hinge of LCD ass’y. But be careful not to damage the hinge.
Samsung Electronics |
4-21 |
Disassembly
4-11 Engine Controller Board
Paper
In order for disassembling PCU, the printer should be turned upside down. When turned over, toner may contaminate LSU window. Open the Cover Top and you should insert one paper into the inner like above figure.
Open the Cover Rear and remove the Cover PCB.
After removing Cover Rear, disconnect all wires from the PCU. and then remove the screw of Ground Shield SMPS, Turn over the printer.
Screw
wires
4-22 |
Samsung Electronics |
Disassembly
Bar Cross Bottom
CST Sensor
After turning over, remove Bar cross Bottom by unscrewing them 8 screws.
Next remove the CST Sensor and remove the screws in the PCU which are black colored screws.
Samsung Electronics |
4-23 |
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