Mosa MS 200 S User manual

MS 200 S
USE AND MAINTENANCE MANUAL
SPARE PARTS CATALOG
222209003 - GB1 0 0 5
22220M00
preparato da UPT
approvato da DITE

Quality system GE_, MS_, TS_, EAS_
M
01
© MOSA 1.2-05/03
UNI EN ISO 9001 : 2000
10/10/02 M01-GB
MOSA has certified its quality system according to
UNI EN ISO 9001:2000 to ensure a constant, high
quality of its products. This certification covers the
design, production and servicing of engine driven
welders and generating sets.
The certifying institute, ICIM, which is a member of
the International Certification Network IQNet,
awarded the official approval to MOSA after an
examination of its operations at the head office and
plant in Cusago (MI), Italy.
This certification is not a point of arrival but a pledge
on the part of the entire company to maintain a level
of quality of both its products and services which
will continue to satisfy the needs of its clients, as
well as to improve the transparency and the
communications regarding all the company’s actives
in accordance with the official procedures and in
harmony with the MOSA Manual of Quality.
The advantages for MOSA clients are:
·Constant quality of products and services at the
high level which the client expects;
·Continuous efforts to improve the products and
their performance at competitive conditions;
·Competent support in the solution of problems;
·Information and training in the correct application
and use of the products to assure the security of
the operator and protect the environment;
·Regular inspections by ICIM to confirm that the
requirements of the company’s quality system
and ISO 9001 are being respected.
All these advantages are guaranteed by the
CERTIFICATE OF QUALITY SYSTEM No.0192
issued by ICIM S.p.A. - Milano (Italy ) - www.icim.it

Index MSG 200 - MSG CHOPPER
M
1
© MOSA 1.0-03/98
02/03/92 22220-GB
UNPACKING ...................................................... M 3
TECHNICAL DATA ................................................................................ M 3.1
RECOMMENDED ELECTRODES .................................................. M 3.2
CONTROLS ............................................................................................ M 4.2
OPERATING INSTRUCTIONS ............................................................. M 5
STARTING / STOPPING THE MACHINE......................................................... M 6
OPERATION AS A WELDER ......................................................... M 6.1
OPERATION AS A GENERATOR ......................................................... M 7
MAINTENANCE .................................................................................... M 9
MAINTENANCE INSTRUCTIONS .................................................. M 9.1
TROUBLESHOOTING .......................................................................... M 9.3
ELECTRICAL SCHEMATIC .................................................................. M 11
LIST OF SPARE PARTS ....................................................................... R 1
ENGINE & EXHAUST ..................................................................... AB 1
ENGINE CRANKCASE ................................................................... AB 2
WELDING DIODE BRIDGE AND WELDING/AUXILIARY KNOB .... AF 3
CARBURETOR AND CURRENT REGULATOR ............................. AB 4
ALTERNATOR ASSEMBLY ............................................................ AB 5
RECOIL STARTER, ALTERN. HOUSING AND FRONT COVER .... AB 6
EXCITATION P.C.B., SOLENOID & CONDENSER .......................... AF 7
HOUSING & FUEL TANK ............................................................... AB 8
LABELS .......................................................................................... AF 9
ACCESSORIES (OPTION) ............................................................ AB 10

INFORMATION
Dear Customer,
We wish to thank you for having bought from
MOSA a high quality set.
Our sections for Technical Service and Spare
Parts will work at best to help you if it were
necessary.
To this purpose we advise you, for all control and
overhaul operations, to turn to the nearest
authorized Service Centre, where you will obtain
a prompt and specialized intervention.
☞In case you do not profit on these Services and
some parts are replaced, please ask and be
sure that are used exclusively original MOSA
parts; this to guarantee that the performances
and the initial safety prescribed by the norms in
force are re-established.
☞Theuseofnon original spare parts will cancel
immediately anyguaranteeand TechnicalSer-
vice obligation from MOSA.
NOTES ABOUT THE MANUAL
Before actioning the machine please read this
manual attentively. Follow the instructions
contained in it, in this way you will avoid
inconveniences due to negligence, mistakes or
incorrectmaintenance.The manual isforqualified
personnel, who knows the rules: about safety and
health, installation and use of sets movable as
well as fixed.
You must remember that, in case you have
difficulties for use or installation or others, our
Technical Service is always at your disposal for
explanations or interventions.
Themanualfor Use MaintenanceandSpare Parts
is an integrant part of the product. It must be kept
with care during all the life of the product.
In case the machine and/or the set should be
yielded to another user, this manual must also
given to him.
Do not damage it, do not take parts away, do not
tear pages and keep it in places protected from
dampness and heat.
You must take into account that some figures
contained in it want only to identify the described
parts and therefore might not correspond to the
machine in your possession.
INFORMATION OF GENERAL TYPE
In the envelope given together with the machine
and/or set you will find: the manual for Use
Maintenance and Spare Parts, the manual for
use of the engine and the tools (if included in the
equipment),the guarantee (in thecountries where
it is prescribed by law).
Our products have been designed for the use of
generation for welding, electric and hydraulic
system; ANY OTHER DIFFERENT USE NOT
INCLUDED IN THE ONE INDICATED, relieves
MOSA from the risks which could happen or,
anyway, from that which was agreed when selling
the machine; MOSA excludes any responsibility
for damages to the machine, to the things or to
persons in this case.
Our products are made in conformity with the
safety norms in force, for which it is advisable to
use all these devices or information so that the
use does not bring damage to persons or things.
While working it is advisable to keep to the
personal safety norms in force in the countries to
whichtheproduct is destined (clothing,worktools,
etc.).
Donot modifyfor anymotive partsof themachine
(fastenings,holes, electric ormechanical devices,
others..)if not dulyauthorizedin writing byMOSA:
the responsibility coming from any potential
intervention will fall on the executioner as in fact
he becomes maker of the machine.
Notes GE_, MS_, TS_, EAS_
M
1-1
© MOSA 1.0-10/02
☞Notice: thismanual does not engage MOSA,
who keeps the faculty, apart the essential
characteristicsof the modelhere described and
illustrated,tobringbettermentsandmodifications
to parts and accessories, without putting this
manualuptodate immediately.
10/10/02 M 1-1 GB

CE MARK GE_, MS_, TS_, EAS_
M
1.4
© MOSA 1.2-06/03
The CE mark (European Community) certifies that the product complies with the essential
safety requirements provided by the applicable COMMUNITY DIRECTIVES. In the Conformity
Declaration are reported the HARMONIZED NORMS and not, used for the checking.
10/10/02 M1-4 GB

UNPACKING GE_, MS_, TS_
M
3
© MOSA 1.1-02/04
NOTE
!
☞Be sure that the lifting devices are: correctly mounted,
adequate for the weight of the machine with it’s
packaging, and conforms to local rules and regula-
tions.
When receiving the goods make sure that the prod-
uct has not suffered damage during the transport,
that there has not been rough handling or taking
away of parts contained inside the packing or in the
set.
In case you find damages, rough handling or ab-
sence of parts (envelopes, manuals, etc.), we ad-
vise you to inform immediately our Technical Ser-
vice.
For eliminating the packing materials, the User
must keep to the norms in force in his country.
1) Take the machine (C) out of the shipment packing.
Take out of the envelope (A) the user’s manual (B).
2) Read: the user’s manual (B), the plates fixed on the
machine, the data plate.
30/03/00 M3GB

02/03/92 22220-GB
Technical data MS 200 S
M
3.1
© MOSA 1.0-02/00
The MS 200 S engine driven welder ia a unit which ensures the function as:
a) a current source for arc welding
b) a current source for the auxiliary power generation
It is meant for industrial and professional use, powered by an endothermic engine; it is composed of
various main parts such as: engine, alternator, electric and electronic controls, the fairing or a protective structure.
The assembling is made on a steel structure, on which are provided elastic support which must damp the vibrations and also
eliminate sounds which would produce noise.
OUTPUT
Declared powers at the following ambient conditions: temperature 20*C, relative humidity 30% altitude 100 m above sea level.
In an approximative way one reduces: of 1% every 100 m altitude and of 2.5% for every 5°C above 25°C.
For possible modifications or changes to be brought on the engines, with climate conditions different from those above
mentioned, please call our Assistance Authorized Centers.
ACOUSTIC POWER LEVEL
The machine respects the noise limits, expressed in sound power, given in the a.m. directives.
These limits can be used to judge the sound level produced on site.
For example: the sound power level of 100 LWA.
The sound pressure (noise produced) at 7 meters distance is about 75dBA (the limit value less 25).
To calculate the sound level at other distances use this formula:
dBAx =dBAy + 10 log
At 4 meters the noise level becomes:
75 dBA + 10 log = 80 dBA
Technical data MS 200 S
D.C. WELDING C.C.
Welding current regulation 50 - 165A
Weldingvoltage 50 V
Service 165A - 35%, 140A - 60%
Ø electrode 2 - 4 mm
A.C. GENERATOR
Single-phase generation 2 kVA / 230 V / 8.7 A
Service 100 %
Frequency 50 Hz
ALTERNATOR High frequency, self-regulated,brushless
Insulatingclass H
ENGINE
Mark MOSA
Type 2-Stroke
Displacement 125cm3
Cylinders 1
Output * 6.6 kW (9 HP)
Speed 6000 rpm
Fuelconsumption 530 g/kWh
Cooling system Air
Starter Electric
Fuel Mixture (gas/oil) (50:1)
GENERAL SPECIFICATIONS
Capacità serbatoio 3 l
Running time (60%) 1.5 h
Protection IP 23
Dimensions / max. (Lxlxh in mm) * 570x300x410
Weight 28 Kg
NoiseLevel 101 LWA (76 dB(A) - 7 m)
* Dimensions and weight are inclusive of all parts without wheels and towbar CTM.
ry²
rx²
7²
4²

RECOMMENDED ELECTRODES MS 200 S - MSG 200/CHOPPER
MSG 201 S 50/60 Hz
M
3.2
© MOSA 1.0-07/95
18/07/95 M3.2 GB
The information here below are to be intended only as indicative since the above norm is much larger.
For further details please see the specific norms and/or the manufacturers of the product to be used in the welding process.
RUTILE ELECTRODES: E 6013
Easily removable fluid slag, suitable foe welding in all position.
Rutile electrodes weld in d.c. with both polarities (electrode holder at + or -) and in a.c..
Suitable for soft steels R-38/45 kg/mm2 . Also for soft steels of lower quality.
BASIC ELECTRODES: E 7015
Basic electrrodes wels onlu in d.c. with inverse polarity (+ on the electrode holder) ; there are also types for a.c.
Suitable for impure carbon steels. Weld in all position.
HIGH YIELD BASIC ELECTRODES: E 7018
The iron contained in the coating increases the quality of metal added. Good mechanical properties. Weld in all position.
Electrode holder at + (inverse polarity). Wld deposit of nice aspect, also vertical. Workable; high yield.
Suitable for steels with high contens of sulphur (impurities).
CELLULOSIC ELECTRODES: E 6010
Cellulosic electrodes weld only in d.c. with polarity + electrode holder - ground clamp.
Special for steels run on pipes with R max 55 kg/mm2. Weld in all position. volatile slag.
ELECTRODES IDENTIFICATION ACCORDING TO A.W.S. STANDARDS
EXXY Z
2 digits: type of coating
and electric power
conditions.
(see table 3)
1 digits: welding
positions.
(see table 2)
2÷3 digits: tesile strenght
of the weld deposit.
(see table 1)
symbol for
"Coated
electrode"
10 Cellulose electrodes for d.c.
11 Cellulose electrodes for a.c.
12 Rutile electrode for d.c.
13 Rutile electrode for a.c.
14 High yield rutile electrodes
15 Basic electrodes for d.c.
16 Basic electrodes for c.a.
18 High yield basic electrodes for d.c.
(inverse polarity)
20 Acid electrodes for flat or front position welding for
d.c. (- pole) and for a.c.
24 High yield rutile electrodes for flat or front plane
position welding for d.c. and a.c.
27 High yield acid electrodes for flat or front plane
position welding for d.c. (- pole) and a.c..
28 High yield basic electrodes for flat or front plane
position welding for d.c. (inverse polarity)
30 Extra high yield acid electrodes, extra high
penetration if required, for flat position welding
only for d.c. (- pole) and a.c.
N° Descrizione
Number Strenght
K.s.l. Kg/mm2
60
70
80
90
100
110
120
60.000
70.000
80.000
90.000
100.000
110.000
120.000
42
49
56
63
70
77
84
for all positions
for plane and verticl
for plane posotion only
1
2
3
Table 1
Table 2 Table 3

18/09/95 10160 M4.2 - GB
CONTROLS MS 200 S - MSG 200/CHOPPER
M
4.2
© MOSA 1.0-09/95
VERSIONE CEE
1 Fuel valve
2 Level fuel
3 Fuel tank cap
4 Spark plug
5 Muffler
6 Air filter
7 Choke lever
8 Auxiliary power receptacle
9 Fuse
10 Overload indicator
11 Engine stop button
12 Welding current adjusting lever
13 Welding output sockets
14 Weldingl/auxiliary commutator
15 Recoil starter handle
16 Unit cross bar footrest

18/09/95 10160 M5 - I
OPERATING INSTRUCTIONS MS 200 S - MSG 200/CHOPPER
M
5
© MOSA 1.0-
PRECAUTION BEFORE USE
WARNING
!
•Stop engine when fueling.
•Do not smoke when fuelíng.
•Remove cap slowly to release
pressure.
•Do not overfili tank.
•Wipe up spilied fuel and allow
fumes to clear before starting
engine.
•Keep sparks and fiame away from
tank.
•Shut off fuel at tank when moving
machine.
FUEL
The engine requires a 50:1 Fuel-Oil mixture. Use a good
quality two-cycle oil rated for air-cooled engines (chainsaws,
lawnmowers, snowmobiles). Do NOT use two-cycle oil for
marine engines.
The proper 50:1 mixture is obtained by using 2.5 ounces of
two-stroke oil for every gallon of gasoline. This is equivalent
to 20 ml every liter.
An incorrect fuel-oil mixture can damage the engine. It is
advisable to premix fuel-oil in a special container according to
the instructions for a 5O: 1 mixture as shown on commer-cially
available cans of two-cycle air-cooled engine oil.
INSTALLATION
GASOLINE
can cause fire
or explosion
WARNING
!
•Use in open, well ventilated area
or vent exhaust outslde.
ENGINE EXHAUST
can kill
POSITION
Place the welder on a flat, level surface and assure an
unrestricted flow of clean fresh air. Vent the exhaust outside.
EXHAUST SPARK ARRESTOR
Some federal, state or local laws may require that gasoline
engines be equipped with exhaust spark arresters when they
are operated in certain locations where un-arrested sparks
may present a fire hazard. The standard mufflers included
with these welders do not qualify as spark arresters. When
required by local regulations, suitable spark arresters must be
installed and properly maintained.
PRECAUTION TO USE
•Do not touch electrically live parts
or electrode with skin or wet
clothing.
•lnsulate yourself from work and
ground.
•Always wear dry insulating gloves.
ELECTRIC SHOCK
can kill
•Keep flammable material away.
•Do not weld on containers which
have held flammable materials.
WELDING SPARKS
can cause fire
or explosion
•Keep your head out of fumes.
•Use ventilation or exhaust to
remove fumes from breathing zone
FUMES AND
GASES
can be dangerous
•Wear eye, ear and body protection.
ARC RAYS can burn
NOISE can
damage hearing
WARNING
!

STARTING / STOPPING THE ENGINE MS 200 S - MSG 200/CHOPPER
© MOSA 1.0-09/95
18/09/95 10160 M6 - I
M
6
STARTING THE ENGINE
STOPPING THE ENGINE
ENGINE COLD
- Open the fuel valve (1) and let the fuel fill the carburetor bowl.
- Move the choke lever (7) to position (A).
- Place one foot (16) firmly on the engine cross bar foot rest
(15) and crank the engine with a firm steady pull on the
rope.
- Immediately after the engine has started rotate the choke
lever to the open position.
If the engine fails to start after several attempts, put the choke
lever in the open position and crank the engine.
Allow the engine to warrn up gradually by letting it idle without
load for a few minutes.
- Remove the load and with the engine running at idle close
the fuel valve (1).
- The engine will stop once the fuel remaining in the carburetor
bowl is used up.
- This makes it easier to start the engine later.
- The engíne speed may become erratic as fuel is used up.
To stop the engine immediately press the stop button (11) and
hold it until the engine comes to a stop.
Tum off the fuel valve before moving the welder.

USE AS A WELDER MSG 200 - MSG CHOPPER
© MOSA 1.0-03/98
02/03/92 22220M6.1 - GB
M
6.1
Insert the electrode cable plug into the (+) socket and the work cable plug to the (-) socket and tum them clockwise until they are
tight.
The machine is ready for welding.
Cables should not exceed a length of 16 feet (5 m) and should be AWG3 (25 mmq) or larger.
The use of other cables (smaller section and larger) will reduce the output of the welder.
Start the engine and set the welding current adjusting lever (12) to the desired welding current and the machine is ready for
welding.
The engine runs at idle until the electrode comes in contact with the workpiece.
Once contact has been made an electronic circuit automatically increases the engine speed to give the welding current
selected with the welding current adjusting lever.
When the electrode is removed from the workpiece the engine retums to idle.
To strike the welding arc scratch the electrode against the workpiece as if striking a match.
Do not hammer the electrode against the workpiece.
The welding current adjusting lever (12) gives minimum current when it is at the bottom and maximum current when it is at the
top.
The welding current can be adjusted while welding.

MAINTENANCE MS 200 S - MSG 200/CHOPPER
MSG 201 S 50/60 Hz© MOSA 1.0-09/95
18/09/95 10160M9 - GB
M
9
ATTENZIONE
!
MSG and MS have been designed to reduce maintenance to a minimum.
Components are, however, subject to normal w ear and accumulation of deposits and periodic checks, cleaning and/or
replacement and overhaul should be performed according to the following schedule:
Checks to be performed
Sparkplug C R
Air filter C R
Carbon deposits C
Cables C
Fuel filter T
Carburetor linkage T
Engine (including ignition, carburetor, etc.) O
EVERY
50 100 200 1000
Legend:
C = cleaning
T = test/check
S = replacement
O = check and general overhaul (as required)
☞☞
☞☞
☞N.B.: All warning and decals should be checked once a year and replaced if missing or unreadable.
•Have qualified personnel do maintenance and troubleshooting work.
•lf possible, turn the engine off before working inside the machine. If for
any reason the machine must be operated while working inside, pay
attention to hot surfaces which may be protected when the machine is
open.
•Remove guards only when necessary to perform maintenance, and
replace them when the maintenance requiring their removal is complete. HOT surface
can
hurt you
MOVING
PARTS
can injure

MAINTENANCE INSTRUCTIONS MS 200 S - MSG 200/CHOPPER
MSG 201 S 50/60 Hz© MOSA 1.0-09/95
18/09/95 10160M9.1 - GB
M
9.1
EVERY 50 WORKING HOURS
Clean the spark plug (4) (Champion L87YC or Bosch
W200T35) and check electrode gap. Gap should be 0.7 mm.
Clean the air filter element (6-1) using compressed air.
To remove the element, first remove the four hex socket head
(4 mm) screws (6-2) shown in the figure.
Be careful not to lose the rubber gasket (6-3) between the
housing and the carburetor.
Open the housing by removing the six slotted head screws (6-
4).
After cleaning the element, place it back into the housing,
making sure that it seats properly against both sides of the
housing.
Reassemble the housing with the six slotted screws (6-4) and
their nuts.
Mount the housing back into the machine making sure that the
flat side of the rubber gasket (6-3) is mounted toward the
housing.
Reinstall the four hex screws (6-2).

MAINTENANCE INSTRUCTIONS MS 200 S - MSG 200/CHOPPER
MSG 201 S 50/60 Hz© MOSA 1.0-09/95
18/09/95 10160M9.2 - GB
M
9.2
EVERY 100 WORKING HOURS
Replace air filter element and spark plug (4) (Champion
L87YC). Gap should be 0.028" (0.7 mm) (refer to 50 Working
Hours instructions).
Clean the fuel filter (B).
To check and adjust the carburetor linkage, do as follows:
Stop the engine, remove the capacitor side cover. Make sure
that the spring (F) is hooked.
Push the electromagnet contrast lever (H) upwards to annul
completely the running of the electromagnet shaft (G).
Keep constantly the contrast lever (H) in this position and the
carburetor throttle con-rod (K) completely down. Turn the
adjusting screw (I) so as to shift the pad (J) and obtain the
desired gap 0.04-0.08 inch (1 - 2 mm) between the con-rod
(K) and the pad (J).
EVERY 200 HOURS
Check exhaust port and muffler for excessive carbon deposits.
If necessary remove deposits from cylinder head, exhaust
port and muffler.
If cylinder head is removed it must be tightened to 8.8 fL-
Ibs.(12 Nm) torque when reassembling.
Check welding cables and replace if necessary.
EVERY 1000 HOURS
Take the welder to an authorized service center for a complete
check and overhaul as required.

TROUBLESHOOTING MSG 200 - MSG CHOPPER
MSG 201 S 50/60 Hz© MOSA 1.0-03/98
02/03/92 22220M9.3 - GB
M
9.3
WARNING
!
•Have qualified personnel do maintenance and troubleshooting work.
•lf possible, turn the engine off before working inside the machine.
•Remove guards only when necessary to perform maintenance, and replace them when the
maintenance requiring their removal is complete.
MOVING
PARTS
can injure
FAILURES
1. ENGINE DOES NOT START OR IS HARD TO START
2. WELDER DOES NOT DELIVER MAXIMUM OUTPUT
3. ENGINE WELDS BUT STAYS ACCELERATED
4. ENGINE REMAINS AT IDLE AND DOES NOT WELD
S. ENGINE ACCELERATES BUT DOES NOT WELD
Special tools required

TROUBLESHOOTING MS 200 S - MSG 200/CHOPPER
MSG 201 S 50/60 Hz© MOSA 1.0-09/95
18/09/95 10160M9.4 - GB
M
9.4
SYMPTOM POSSIBLE CAUSES REMEDY
1. ENGINE DOES NOT
START OR IS HARD TO
START
a) Lack of fuel Fill the tank with the 5O:1 Fuel-Oil mixture as described in the
Pre-Operating Maintenance section of the Operating Manual.
b) Fuel valve partially
closed
Turn the fuel valve knob (1) completely clockwise.
c)Wrong choke lever
position
Choke lever (7) in the wrong position.
Cold engine-close choke (move lever toward the machine).
Warm engine-close choke (move lever toward the machine)
and open immediately upo n successful engine start.
d)Fuel not reaching
carburetor
Take apart fuel valve and clean inlet filter.
Clean inlet filter (B) of carburetor.
e) Carburetor jets clogged Remove both main (C) and idle (D) jets and check for
obstructions by looking through them.
Blow them out with compressed air.
☞Cautíon: ldle jet can be easily damaged.

TROUBLESHOOTING MS 200 S - MSG 200/CHOPPER
MSG 201 S 50/60 Hz© MOSA 1.0-09/95
18/09/95 10160M9.5 - GB
M
9.5
SYMPTOM POSSIBLE CAUSES REMEDY
f) Engine flooded Remove spark plug and dry with compressed air.
Close fuel valve (1) and turn engine over to remove excess fuel.
Replace spark plug.
g) Spark plug or ignition
system failure
Check connections between spark plug and high tension coil.
Check connection of ground wires (L).
Check spark plug (Q) for worn electrode, damaged porcelain
coating or incorrect gap (correct gap is 0.7 mm).
Replace electronic ignition module (M).
Replace high voltage coil (N).
Replace ignition coil on flywheel magneto (P).

TROUBLESHOOTING MS 200 S - MSG 200/CHOPPER
MSG 201 S 50/60 Hz© MOSA 1.0-09/95
18/09/95 10160M9.6 - GB
M
9.6
SYMPTOM POSSIBLE CAUSES REMEDY
a) Regulating lever not on
maximum
Move the lever all the way up
b) Incorrect adjustment of
carburator linkage
Adjust the carburetor throttle control lever as follows:
- Stop engine
- Remove right side cover (condenser side)
- Check that the welding current adjusting spring (F) is attached.
- Push the lever (H) upward against the electromagnet plunger
(G) until they stop.
- Keeping lever (H) in this position, push the throttle control lever
(K) all the way down and tum the adjustment screw (I) until the
gap between the lever (K) and the pad (J) is 1-2 mm.
2. WELDER DOES NOT
DELIVER MAXIMUM
OUTPUT
c) Faulty condenser Short circuit the condenser to be sure that it is discharged.
Disconnect all wires from condenser and using an ohmmeter
check whether or not the condenser is short circuited. If so the
condenser must be replaced.
Reverse the leads and confirm that the ohmmeter dips briefly.
If not replace the condenser.

TROUBLESHOOTING MS 200 S - MSG 200/CHOPPER
MSG 201 S 50/60 Hz© MOSA 1.0-09/95
18/09/95 10160M9.7 - GB
M
9.7
SYMPTOM POSSIBLE CAUSES REMEDY
d)Faulty printed circuit
board
If no other faults are found the printed circuit board is faulty.
Replace as follows:
- Disconnect all wires with connectors
- Remove the electronic circuit from the mounting frame.
e) Faulty welding diodes Check the diodes by putting the welding/auxiliary knob in the
welding position and with a multimeter set on “diode test”, check
them between the welding outlets + and - there is 0.9 ÷ 1V in
one sense and open circuit in the opposed sense.
If the bridge is faulty, it is advised to turn to an authorized service
center for the replacement.
ONLY FOR MS 200 S
Check the diodes with a multimeter set on “diode test”, check
them between the welding outlets + and - there is 0.9 ÷ 1V in
one sense and open circuit in the opposed sense.