Bungard DL 500 User manual

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1. Preface
With the this instruction we would like to give an
overview about structure, function and operation
of the conveyor spray etching machine DL500..
Please read the following te t carefully and partic-
ularly consider the references to job safety and
set-up. Deposit this instruction at a safe place. It
contains information on maintenance or cleaning,
which you will need later on as well.
If you encounter a problem which is not answered
by this manual, please contact us by phone or by
mail. This will enable us to give specific advice
and analyse malfunction if this ever occurs.
The machines are manufactured by Bungard
Elektronik, Rilkestraße 1, D-51570 Windeck and
brought into circulation in the EEC-MEMBER
countries by the respective retailers/contracting
parties.
Operational areas:
aqueous-alkaline or sour etching of printed circuit
boards.
Developing of positive or negatively working,
aqueous-alkalinely processable fotoresists or
laminates (if necessary add antifoaming agents).
Alkaline resist stripping (additional filtration unit
necessarily).
2. Safety Instructions
The machines are intended for the chemico-
physical treatment of printed circuit boards.
The machines are not intended to be integrated
or connected with other machines or plants. They
may be operated only in appropriate areas and
run only by qualified technical personnel. Children
and domestic animals are to be kept away!
Electric
The machine is manufactured using certified
parts according to the usual guidelines for elec-
trical security. This does not release the user
however of its duty to e ercise diligence while
handling electrically operated devices.
Before all maintenance work on the machine
(filling, emptying, cleaning etc.) switch off the
machine and pull power supply plugs.
DL 500
Etching Machine
Instructions for Use
Bungard Elektronik GmbH & Co. KG, Rilkestraße 1, 51570 Windeck – Germany
Tel.: [phone], Fa : +49 (0) 2292/6175, E-mail: [e-mail]

Seite 2 / 12
Pay increased attention to electrical defects be-
cause of the conductivity of etching solution con-
taining metal salts. In this a case pull the plug of
the machine and replug only after professional re-
pair. This is also valid for spilled etching agent.
There are parts under voltage in the cable chan-
nel and in the control unit. The cable to the pump
motor may carry bracing from the condenser.
Wait for retension before touching these parts.
Personal protection equipment
While handling etching agents, thus in particular
when filling and emptying the machine, wear usu-
al protection equipment, like apron, gloves and
eye protection.
Temperature
The machine may be switched on only with filled
etching agent chamber. The quartz glow bar must
be always sufficiently covered with etching agent!
Uncovered glow bar may cause destruction of
machine! Fill the etching chamber up to 1 cm un-
der the cover of the medium container.
The electronic thermostat is secured against
break and short-circuit by the thermo sensor. This
does not release the operator however of the ob-
ligation to supervise the temperature of the etch-
ing agent: Perhaps e othermic chemical reac-
tions can lead to overheating of the etching
agent. The ma imally permissible operating tem-
perature of the machine amounts to 50° C.
If the etching agent is prepared by release from
salts or mixing liquids, this must always take
place outside of the machine! ay attention to
the safety references of the chemical manufac-
turer as well.
Before use of etching agents, whose chemical re-
action behavior is or might be e othermic, please
coordinate additional measures against overheat-
ing with us.
If despite all precautionary measures an over-
heating of the etching agent should arise, the
heating must be switched off at first. The etching
agent pump must remain however switched on,
so that the etching agent is cooled by the circula-
tion.
Place of assembly
Requirement according to WHG and/or supervi-
sion of trade: In order to prevent the penetration
of etching agent into the ground, the machine
must be installed a) in a sufficiently large area
with chemical-firm, waterproof ground lining (no
tiles, no concrete!) or b) in a chemical resistance,
waterproof collecting tray, which seizes the entire
volume of the etching liquid. We offer such a tray
as an option.
Personal security
The DL 500 is equipped
with a protective switch
mounted to the cover (1).
This will turn off the pump
as soon as the cover is lif-
ted. You should temporarily
check the function of this switch: Close the valve
of the feeding tube from the medium container to
the etching zone completely (!). Switch in the
pump. When you lift the hood for more than 3
mm the pump must switch off.
Exhaust air
We recommend to install an e haust above the
machine for eventual etching steams. This re-
commendation is however purely precautionary.
Leakage of aggressive steams could not be
proven in two independent investigations. (water
vapour escapes, the salts of the etching agent
remains in the solution).
The machine possesses at the back of the rinsing
compartment a pipe socket, which can be con-
nected to the e haust air system of the building.
The ventilating outlet is consciously not arranged
at the etching zone, in order to prevent that e -
cept steams also liquid etching agent can arrive
into the e haust air system.
DL 500
Etching Machine
Instructions for Use
(1)
Bungard Elektronik GmbH & Co. KG, Rilkestraße 1, 51570 Windeck – Germany
Tel.: [phone], Fa : +49 (0) 2292/6175, E-mail: [e-mail]

Seite 3 / 12
Environmental protection
Used up etching agent is special refuse. It must
be handed over to certified disposal enterprises
under indication of the waste key number. Pay at-
tention to the refuse laws and regulations of your
country. We are not authorized to redemption.
Waste water
Prior to operating the machine, be informed on all
applying environmental protection legislation of
your country. Used etching liquid contains copper
and must be treated as special waste. In most
countries, this applies also for the rinse water.
We recommend that you collect dirty rinse water
and use it to set up fresh etching liquid. In accord-
ance to anti pollution laws, the final cleaning of
the boards normally requires a cascade rinsing
unit, or further wet process steps, like chem. tin-
ning or resist stripping. Any attempt to neutralize
the etchant or the rinse water is NOT recom-
mendable to other than approved chemists.
We recommend to use the rinsing unit of the
DL500 either in a closed cycle or have the rinse
water run over a waste water treatment like the
Bungard IONEX.
3. Technical Data
Electrical
connection:
220 V~, 50 Hz, ca. 1.5 kW
imensions ca. 110 X 100 60 cm (B H T)
Max Board
Size:
510 mm endless
Fill Quant-
ity:
ca. 55 l Etching Agent
Weight: ca. 100 kg
Material: PVC, PP, Titan
Width of the
board gap
510 mm
Conveyor
speed
Stepless adjustable 0 - 1.5
m/min
Pump Centrifugal pump delivery rate
ca. 200 l/min, spray pressure
stepless adjustable by valve
Heating 1000W Quarz glow bar
Speed of
Etching
ca. 35µm in 90 s
Technical changes reserved.
4. Construction
(2)
The machine body is made from PVC. It is di-
vided into infeed-, etching-, rinsing- and outfeed-
zone. The removable media tank is located in the
pedestal of the machine (2).
The cover is made from
grey and transparent
PVC. It carries housings
to fi the removable parti-
tion walls.
The media tank is easy
to access and can be en-
tirely removed from the
machine (3). The top
cover of the tank carries the pump. This is a sub-
mersion centrifugal pump which propels with
DL 500
Etching Machine
Instructions for Use
Base with
Medium
Container
Control
Panel
Cover
Exit Zone
Intake Zone
Etching
Chamber
insing
Zone
Bungard Elektronik GmbH & Co. KG, Rilkestraße 1, 51570 Windeck – Germany
Tel.: [phone], Fa : +49 (0) 2292/6175, E-mail: [e-mail]

Seite 4 / 12
highpressure the etching medium to the 4 mani-
folds, each of them equipped with 14 flat spray
nozzles. The liquid returns to the tank via 2 PVC
drain pipes of big diameter. The tank carries a
1000 W heater element and the temperature
sensor.
The conveyor system is
made from 13 pairs of
PVC covered rollers and of
one infeed and outfeed
roller at each end of the
machine (4). The squee-
gee rollers are covered
with a sponge cloth each.
Using an endless belt, the
rollers are directly coupled to a gear motor.
The water access to the
rinsing compartment is
controlled by both a mag-
netic and a manual oper-
ated valve. The magnetic
valve opens only when the
etching pump is operating.
A circuit rinse or a down-
stream rinsing water treat-
ment are as an option available (5).
The control unit is mounted on top of the machine
(6). To permit easy
access from each
side of the ma-
chine, it can be
turned into almost
any position. The
front panel carries
illuminated
switches for the main supply, pump, conveyor
and heating circuits as well as a potentiometer for
conveyor speed adjustment and the digital-reed-
out thermostat.
5. Setting Up
Observe please the order of the steps to start-up
e actly and attach the machine only after filling to
electricity mains. Consider also the safety refer-
ences.
1. Check it for any damage immediately
after reception and if damages are dis-
covered contact us and the transport
agent to state the facts of damage.
2. The machine is fi ed to the transport con-
tainer or to the palette by plastic tapes.
Remove all packing material and tapes
from the cover, the control unit and the
medium tank.
3. To avoid damage, do not move the ma-
chine on the ground. With the help of at
least one other person, carry it to the de-
sired location. The best possibility to
handle the machine is to hold it at the left
and right side walls on each end.
4. The location must fit the labour protection
requirements for etching machines, i. e.
ventilation, sealed floor etc. It must
further offer power and water installation
close-by.
5. The place must be straight and even. It
must carry the entire bottom of the ma-
chine (no palettes!). With respect to an
easy feeding and a good access also to
the back side of the machine, there
should be a free area of about 2m 2m.
6. The boards are passing the machine
from the right to the left, if seen from the
closed side of the pedestal (front side).
7. Make sure that the
drain valve for the
etching agent is
closed (7). Install
the drain and the
supply hose for
the rinsing zone.
The inlet is from
the rear seen left.
DL 500
Etching Machine
Instructions for Use
(4)
(6)
(5)
(7)
Bungard Elektronik GmbH & Co. KG, Rilkestraße 1, 51570 Windeck – Germany
Tel.: [phone], Fa : +49 (0) 2292/6175, E-mail: [e-mail]

Seite 5 / 12
5.1 First Filling
As a check for tightness and function you should
operate the machine first only with water. After
successful test run the water is replaced by etch-
ing agents. If the medium container was de-
mounted for transport, put it back into its posi-
tion, bolt the connections of the two gutter-pipes
and the tubing and connect the plug contacts for
thermostat, heating staff and engine (plug are
permutation implemented). You can give the wa-
ter through the opening in the cover (filling height
is appro . 1 cm under cover of the medium con-
tainer).
5.2 Check
Before connecting the machine to the power sup-
ply, please check:
The conveyor belt must run parallel to the side
walls of the machine. All upper rollers must lay
close on the lower ones.
If the cover has been taken off the machine, the
intermediate walls and the cover must be
remounted. Take care to mount the cover in a
way that it sits well all on the machine body and
that the security switch is closed.
Check if all fittings are well attached and if all
appropriate valves are closed. If necessary,
tighten the fittings manually.
With respect to the built-in stoppers, move the
control unit to the desired position.
5.3 Electrical connection
Switch off all the switches on the front panel. Turn
the adjustment knobs of the conveyor belt and
the thermostat to zero position. Connect the
power plug to a splash water-protected wall sock-
et. The machine's power consumption (with the
heater running) is about 1.9 kW on 220 V, 50 Hz.
We assume that an appropriate fuse has been in-
stalled to the in-house power circuit.
Now turn on the main switch. It will be lit.
5.4 Test Run
Referring to the description in chapter 4, check in
the below given sequence the function of the con-
veyor, the heater, the pump and the rinse. Pay
special attention to the following topics:
Conveyor
The belt and the rollers must move in a steady
and uniform way. At position 1 on the scale, the
conveyor must just transport a board through the
machine.
Pump
When running the pump, have a close look on the
fittings and the cover. No leaking should be obvi-
ous.
There is a valve in the
mounting pipe fed by the
pump (8). This valve can
be used to reduce spray
pressure, if necessary. A
very low pressure also per-
mits to see if all nozzles
are operating and spray in
the right direction. See
chapter 8.5 for details on
how to adjust the manifolds.
Heater
If any 'abnormal' temperature read-out appears
on the thermostat, check the cable connector to
the sensor.
When the heater is on the quartz tube will shine
in a red to orange colour and the switch at the
control panel will be lit.
Rinse compartment
Check if there is sufficient, but not too much wa-
ter. Pressure is good if the lower jets almost
reach the cover. See if the descent to the drain is
sufficient. If not, the water floods the rinsing com-
partment and e its into the etching zone.
DL 500
Etching Machine
Instructions for Use
(8)
Bungard Elektronik GmbH & Co. KG, Rilkestraße 1, 51570 Windeck – Germany
Tel.: [phone], Fa : +49 (0) 2292/6175, E-mail: [e-mail]

Seite 6 / 12
5.5 ischarging
Empty now the machine completely and pull the
power supply plug. In order to replace the filled in
water by etching agents, empty the medium con-
tainer: Fasten a short piece of hose to the ball
valve of the medium container, the other end of
the hose should end in a plastic bucket. Open
the ball valve and let the air escape from the
hose. Hold the filled hose then into the bucket.
With this `principle of the communicating tubes
you can empty the medium container so far, that
you can move the container from its position
without spilling and then empty it completely. Do
not forget to loosen the fittings and the electrical
connections before moving.
5.6 Fill with etching agent
The machine can be filled alternatively through
the hand hole of the medium container or after
removing the hood, from above via the etching
zone (in that case do not forget to firmly close the
tube fittings). Make sure before filling that the
drain cock of the medium container is closed.
This is the case, if the handle stands perpendicu-
larly to the sleeve. The correct filling level is about
1 cm under the cover of the medium container
with the pump switched off. A too small amount of
filling can lead to damages and must be avoided.
After some operation refilling of etching agent can
be necessary by the hand hole in the cover of the
medium container. After you filled in the finished
and cooled down etching agent and the possibly
dismounted parts are reassembled the machine
is ready for use.
5.7 Trouble
If there were problems coming up during this first
test, which are not described in this manual,
please contact us immediately.
. Operating
6.1 Control Panel
All electric functions of the DL 500 are controlled
from the front
panel of this unit
(9). From the left
to the right,
there are: The
switches for the
main supply, for
the pump motor,
the heater and
the conveyor.
Ne t is the button for speed control of the convey-
or. All to the right, there is the thermostat unit.
The main switch turns off all other switches and
circuits. This permits an instant stop of the ma-
chine under any circumstances.
6.2 Etching circuit
The second switch from the left being turned on
and the cover being closed, the etching pump will
start. It propels the liquid to the nozzle-equipped
manifolds. The flow capacity and the pressure
can be set manually by a valve located in the li-
quid mounting pipe. The liquid returns to the tank
via two fitting connected PVC pipes.
The tank capacity is about 55 litres. The correct
filling level is about 1 cm below the tank cover
plate. A too little filling level will cause the pump
to suck air, which can be heard as a specific
sound.
If the filling level should be lower than the pump
inlet level, the heater element could run free. This
would most certainly lead to a damage to the
machine. It is though necessary to control the
level periodically. To fill up, switch the pump off
and add water or etching medium until the liquid
level is 1 cm below the tank cover.
6.3 Conveyor
The boards to be etched are inserted into the ma-
chine at it's right end, seen from the front. Boards
are put onto the first roller and carefully moved
forward until they are attached by the ne t roller
DL 500
Etching Machine
Instructions for Use
(9)
Bungard Elektronik GmbH & Co. KG, Rilkestraße 1, 51570 Windeck – Germany
Tel.: [phone], Fa : +49 (0) 2292/6175, E-mail: [e-mail]

Seite 7 / 12
pair. It may be necessary to support very long
boards manually until they have completely
entered the machine.
If you did not install a trap table at the machine's
left end, you must take off the etched boards
from the machine manually. Otherwise they might
fall down and get damaged.
Speed can be varied using the button right to the
conveyor switch. At a reading of 1 on the button
scale, the conveyor will run at it's minimum
speed. Actual speed setting depends on temper-
ature, saturation and type of the etching medium
as well as on copper thickness and spray pres-
sure. For fresh warm ferric chloride at about
45°C, a speed setting of about 3 will do.
It might be a good idea to keep a once found set-
ting for 35µm also if boards with 70µm copper are
etched: Just have the board pass the machine
twice.
The speed adjustment is at it's optimum if there
are only very few rests of copper remaining on
the board at the moment that it reaches the last
roller pair in the etching compartment. A board
which was incompletely etched may be pro-
cessed again at a high speed setting. A too little
speed will cause severe under-cut.
6.4 Heater and thermostat
Important: The heater circuit may only be activ-
ated with the tank filled!
The control switch being lit, the heater circuit is
enabled. The switch relates to the thermostat loc-
ated on the right. The themostat first makes a self
test and after some seconds the present temper-
ature of the etching liquid is shown.
The temperature of the therrmostat is preset to
42°C. You should only changes this value, if your
etching liquid compellingly requires another tem
perature. You can change the value by pressing 2
times the SET-key. With the arrow-keys you can
move up or down to the desired temperature.
Press SET again. On the display appears the
word “Set” and above the display the orange
“OUT”-LED goes on. After some seconds the
present temperature of the liquid is shown again.
The temperature setting depends on the type of
etching medium to be used. For ferric chloride
and sodium persulfate, 45°C is best. For chloric
acid (copper chloride) and ammonia based me-
dia, 30 to 40°C are recommended. Ask your
chemistry dealer for details.
Although the thermostat range is up to 60°C, a
temperature setting of more than 50°C is not per-
mitted. Please note that certain etching media
produce heat when used. In this case, the tem-
perature setting must be reduced in advance. Do
not feed the machine with boards until it has
cooled down. We supply a cooling tank as an op-
tion (10+11)
6.5 Rinse
The rinse compartment can either be used with
fresh water or, with an optional tank and pump,
as a closed loop rinse.
For fresh water rinse, there must be a pressure
resistant hose installed between the wall-moun-
ted valve and the machine. In addition, the flow
capacity can be manually set by a valve located
below the rinsing compartment.
Attention: A too high flow rate might cause the
water to mount in the compartment instead of
passing into the drain!
When the etching pump has stopped, the mag-
netic valve also interrupts the rinse. When you
have finished work, close the wall-mounted valve
to prevent e cessive stress to the hose.
DL 500
Etching Machine
Instructions for Use
(10) (11)
Bungard Elektronik GmbH & Co. KG, Rilkestraße 1, 51570 Windeck – Germany
Tel.: [phone], Fa : +49 (0) 2292/6175, E-mail: [e-mail]

Seite 8 / 12
If the optional closed-loop rinse system is in-
stalled, the valve below the rinse compartment
should always be fully opened. There is a separ-
ate instruction for the additional circuit rinse or the
treatment rinse. See remarks in chapter 2 Waste
Water.
7. Mounting / Demounting
Note! Before all maintenance work on the ma-
chine switch off the machine and pull the plug.
Consider also the safety references.
Note: The arrangement of the partition walls,
transportation rolls and blast connections is not
symmetrical. Therefore with cleaning or mainten-
ance work the arrangement of the parts must be
noted and considered when assembling.
7.1 Cover
Before the cover can be lift off the machine, the
control unit must be turned out of the way. Two
persons take the cover at it's lateral ends and lift
it simultaneously.
As soon as the separating walls come free, turn
over the cover in a way that rest of liquid can not
drop. This also prevents any separating walls
sticking to the cover from falling down.
Before remounting the cover, remove all rests of
liquid. For ease of handling, set the separation
walls into their housings in the machine body prior
to mounting the cover.
Important: The security switch key must be care-
fully inserted into it's housing. Be sure that the
cover sits well all on the machine body. If it does
not, the machine will leak. This problem may oc-
cur mainly if the floor at the machine's location is
uneven. In this case, put some rest stripes of
PCBs under the outer corners of the pedestal to
level the machine.
7.2 Machine body
The complete disassembly of the machine's in-
terior components is possible without special
tools. It is though only necessary if special main-
tenance, such as changing the transport belt, is
required. You will have to make notes or to sign
the parts during disassembly. If not otherwise
noted, the assembly of the parts is done in in-
verse order to disassembly.
7.3.1 Upper walls
The different sections in the machine are separ-
ated by each an upper and a lower PVC wall. The
upper walls can be pulled off vertically after the
cover has been removed. Be sure to identify the
proper location of each wall.
7.3.2 Upper rollers
The upper rollers can easily be lift off from their
bearing housings. Take care not to drop the small
plastic bearings at each roller's ends. Collect the
bearings in a bo .
Pay respect to the position and orientation, espe-
cially of the squeegee rollers.
7.3.3 Lower rollers
You can try to pull the lower rollers out from their
bearing housings, but we recommend you to
loosen the belt first. To do so, pull back horizont-
ally the last roller's left end so that it comes free
from the bearing housing and then pull out the
roller's teeth end from underneath the belt.
The belt is kept down on the rollers by some
small `pressure aids' made from titanium and
PVC. These can be pulled out of their housings
only with the belt loosened.
Important: The first and the
last roller each have si
instead of five teeth. It is
important that they are not
interchanged with other
rollers. Otherwise, the
conveyor will not run steadily.
There are some more guiding
aids for the belt mounted in
the infeed and the outfeed zone of the machine
(12+13).
DL 500
Etching Machine
Instructions for Use
(12)
Bungard Elektronik GmbH & Co. KG, Rilkestraße 1, 51570 Windeck – Germany
Tel.: [phone], Fa : +49 (0) 2292/6175, E-mail: [e-mail]

Seite 9 / 12
Carefully collect them so that
they can not get lost. Pay
attention to reassemble
them in the right manner.
7.3.4 Lower walls
All lower separation walls
can be vertically pulled out
from the machine body. Prior to doing so, all
upper rollers must have been removed and the
belt must have been loosened.
7.3.5 Gear Belt
Easing the gear belt and demounting the down-
holder were already discussed in 7.3.3 (lower
transportation rolls). Here now the description of
the remaining tasks to do to remove the belt com-
pletely. After demounting the lower walls, the slit
pipe, in which the gear belt runs, can be pressed
from the lateral mounting plates to the center of
the machine. Particularly consider when re-in-
stalling the pipe that it must lie with the slit side
downward, in order to prevent leaking of etching
agent into the rinsing zone. In the discharge zone
the gear belt runs in a loop by two recesses of a
cover plate. The cover plate is levered off, if ne-
cessary with help of a screwdriver, upward and
removed. Under the cover one sees the connec-
tion to the gear motor. To remove the gear belt,
loosen two attachments screws of the gear mo-
tor. Move the gear motor until you can take out
the gear belt.
Caution! Do not bend the
a is of the gear motor.
The engine must be
fastened right after remov-
ing the gear belt again.
The gear belt together
with the slit pipe can now
be taken out of the ma-
chine (14). In order to remove it from the pipe, e -
pand the pipe by hand at an end a little slit the
pipe between two teeth of the gear belt. The con-
dition of the gear belt should be e amined with
each cleaning or disassembly of the machine.
Possible etching agent deposits must be re-
moved, since they can effect the operation
smoothness.
The gear belt tension changes normally only
slightly. A sudden, larger change of the belts ten-
sion points possibly to a wrong assembly of the
transportation rolls or the downholder. The two
first clamp blocks in the feeding zone of the ma-
chine possess adjusting screws for stretching the
belt. The screws must be adjusted parallel. A
loose gear belt is likely to slip over the rolls. This
becomes apparent in clear crack noises and
leads to uneven etching results and increased
wear of the drive components. A sufficient ten-
sion of the belt is given, if the first transport roles
are slightly movable in longitudinal direction.
Avoid a too high tension of the belt.
If the gear belt is properly adjusted and still not all
roles run evenly, check first if the fleeces are
clamped and if all upper rolls lie on the lower
roles. In the second step e amine the free move-
ment of the downholders. If necessary the pres-
sure of the downholders on the gear belt can be
varied adjusting the grub screws on top of the
holders.
7.4 Manifolds
Important: The upper and lower manifolds have
different length and nozzle equipment. They must
under no circumstances be interchanged. The
manifolds are fi ed in snap-in brackets. To re-
move them, pull them forward until they come
free from the fitting connectors and then carefully
lift them from the brackets. The nozzles are fi ed
to the manifold tubes also by a simple snap-in
system. You may use a pair of pliers to carefully
turn and twist the nozzles off.
Do not use screw drivers or similar! Damage
would result.
To reassemble the manifolds, insert the nozzles
manually. You may put them one by one on a
table with the flat side down and then press the
manifold tube on the nozzle until it snaps in. The
nozzle slots must all be aligned parallel to the
manifold tube a is.
DL 500
Etching Machine
Instructions for Use
(13)
(14)
Bungard Elektronik GmbH & Co. KG, Rilkestraße 1, 51570 Windeck – Germany
Tel.: [phone], Fa : +49 (0) 2292/6175, E-mail: [e-mail]

Seite 10 / 12
The middle row of nozzles must point point per-
pendicular up or down.
To do the adjustment, turn off the pump and take
off the cover. Wear long sleeve protective gloves.
It may be necessary to remove two or three trans-
port roles to adjust the lower nozzles.
To adjust reduce the spray pressure by slightly
closing the valve of the feeding tube, so that the
lower nozzles just spray as far as the height of
the upper nozzles. This simplifies the optical con-
trol.
To adjust the upper nozzles put in a broad board
and turn of the conveyor. Now the lower nozzles
do not interfere with the upper nozzles. When fin-
ished do not forget to readjust the valve of the
feeding tube.
E cept for the (here missing) nozzles, the mani-
folds in the rinse compartment are handled the
same way.
7.2 Tank
The electrical connectors between the tank and
the machine body are located under a cover each
at the tank and at the inner left side of the pedes-
tal. Disconnect the machine from the power sup-
ply prior to opening this cover. To access the con-
nectors, proceed as follows:
Slide the horizontal, U-shaped cover at the tank
to the right so that there is space to seize it at it's
open end. Pull it off from the tank wall. Locate the
opening in the vertically mounted second cover
and pull it away from the pedestal. To completely
remove the cover, it may be necessary to slightly
lift and twist it.
Open the metal locks on the connectors and pull.
The connectors can be identified by size and loc-
ation and are not interchangeable.
Before you can pull the tank out of the pedestal,
you will have to loosen the liquid tubes' screw fit-
tings. You will need the assistance of one more
person to safely carry the tank.The pump is fi ed
to the tank cover by four screws. It can be lift off
from the tank together with the cover.
The assembly is done in inverse order. Be sure to
have the gaskets in place when tightening the
screw fittings. The cable covers will snap into
their holdings when pressed on.
8. Service and maintenance
The machine requires almost no maintenance.
The main service labour is the periodical e -
change of the etching medium and a thorough
cleaning of the machine. When doing such ser-
vice, you may easily check the conveyor system
for wear or use.
The pump, the heater and the rinse compartment
are maintenance-free.
8.1 Cleaning
E cept for the transparent cover, all PVC parts of
the machine can be cleaned using liquid abrasive
products known from the household. If ferric
chloride was used with the machine, we recom-
mend to use our special `spotkiller'.
A thorough rinsing of the appropriate parts is ne-
cessary after each cleaning process.
To clean the tank, remove it from the pedestal, as
described above. To have better access, you may
remove the heater element by unscrewing it's fit-
ting.
If you use flowing water, be careful not to moisten
electric parts. Remember your anti-pollution re-
sponsibility!
The nozzles can be removed from the manifolds
for cleaning. Just rinse them and blow them out
with compressed air.
The sponge cloths on the squeegee rollers must
be treated carefully. Just wash them without rub-
bing them. You can wring them by rolling them on
DL 500
Etching Machine
Instructions for Use
Bungard Elektronik GmbH & Co. KG, Rilkestraße 1, 51570 Windeck – Germany
Tel.: [phone], Fa : +49 (0) 2292/6175, E-mail: [e-mail]