Alto-Shaam xcelerate XL-400 Operating instructions

W164 N9221 Water Street • P.O. Box 450 • Menomonee Falls, Wisconsin 53052-0450 • U.S.A.
PHONE: [phone].558.8744 U.S.A./CANADA FAX: [phone].329.8744 U.S.A. ONLY
www.alto-shaam.com
DUE T O O N G O I N G P R O D U C T I M P R O V E M E N T , S P E C I F I C A T I O N S A R E S U B J E C T T O C H A N G E W I T H O U T N O T I C E .P R I N T E D I N U.S.A.
XL-300, XL-400
Xcelerate™ Hi-Speed Oven
SERVICE INSTRUCTIONS
XLSERVICE• REV. 1 • 08/14

i
Cleaning ................................................................................................ 1
Touch Screen Firmware Update............................................................ 4
How to Change the Door Switch.......................................................... 5
How to Change the Motor..................................................................... 9
How to Change the PCB ..................................................................... 11
How to Change the Speaker ............................................................... 14
How to Check the Microwave ............................................................. 16
How to Check Turning Direction of the T-Verter.................................. 21
How to Connect the Transformer Safety Thermostat.......................... 22
How to Improve Leakage Current - Disable EMI Filter........................ 23
Reset Overheat Protector.................................................................... 25
Xcelerate™ Hi-Speed Oven
TABLE OF CONTENTS

XCELERATE SERVICE INSTRUCTIONS • XLSERVICE • 1.
www.alto-shaam.com |800-558-8744 |262-251-3800
The oven should be cleaned inside and outside on a daily
basis. Outside cleaning: Never use steel wool or abrasive
cleaning material to clean the exterior. Use a moist towel
or recommended stainless steel cleaner.
• Switch off the oven and keep the door closed. The oven
fans will cool down the oven automatically.
• Before starting to clean the oven wait at least 30
minutes to cool down.
• Be careful and make sure it is not hot before reaching
into the oven. Wait until it is cool.
• Please remove the stone and the stone holder made of
chrome nickel steel.
• For safety pull the plug before cleaning the oven.
• Do not use a water jet to clean the appliance. Sever
damage or electrical hazard could result. The warranty
becomes void if appliance is flooded.
• Use a damp clean cloth or sponge to clean the
appliance. If the oven is heavily soiled a liquid
detergent can also be used. After the application of
liquid detergent the baking chamber must be wiped
down with clean water.
• We recommend using a liquid detergent, which is
certified for food industrial use and has capabilities of
removing lipids, proteins and organic substances.
DAILY CLEANING
Wait for the oven to cool down completely. Wear safety
gloves. Remove the stone holder and stone. You may want
to clean the oven in the morning when the oven is cool -
before food production begins.
Xcelerate™ Hi-Speed Oven
CLEANING

XCELERATE SERVICE INSTRUCTIONS • XLSERVICE • 2
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Spray oven cleaner on the side and back walls of the
baking chamber and on the bottom of the baking chamber.
Soak the wire cooking shelf with cleaning detergent to
remove food residue. Wear safety gloves.
Wipe with a damp cloth. Afterwards rinse with fresh
water. You may also use a scotch brite sponge or a plastic
scouring pad to clean the wire cooking shelf.
Before cleaning the stone, be sure the stone has cooled
completely to prevent cracking. To clean the stone use
a damp towel or sponge and fresh water. Do not use a
strong detergent. This can affect the taste of the food.
Discolored marks on the stone are not a sanitation threat,
but be sure to remove larger particles from the surface.
As the water soaks in, wipe off food residue from the door
plate and rinse surface by wiping with a sponge and clean
warm water.
Xcelerate™ Hi-Speed Oven
CLEANING

XCELERATE SERVICE INSTRUCTIONS • XLSERVICE • 3.
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WEEKLY CLEANING
Regularly clean the back vents of the oven of dust and
grease. Be sure the oven has cooled down and the fans are
not running. Use a damp towel. If the cooling vents are
blocked, the oven could malfunction.
Regularly check that the wall clearances are sufficient
otherwise damage to the appliance and surroundings may
occur. Do not store anything directly on the oven.
Keep at least 15 cm distances from heat sources, like a
grill or other heating appliances. Keep at least 102mm
space on the left and right sides, and 300mm clearance
from the back. An optional Alto-Shaam heat shield can be
used in the back to reduce the rear clearance requirement
to 0mm.
Failing to do so will void warranty and cause premature
failure of components. Please refer to the instruction
manual.
Clean the front of the oven the same way. Be sure the
contact area between door and oven front is always clean
and free of debris. Build up of particles in this area can
cause the oven to malfunction.
Wipe the inside of the baking chamber as the detergent
has soaked in. Rinse surfaces by wiping with a sponge and
clean warm water.
Xcelerate™ Hi-Speed Oven
CLEANING

XCELERATE SERVICE INSTRUCTIONS • XLSERVICE • 4
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STEP 1: PREPARE FILE
Copy the firmware file named “AS420UI1.bin” to a good
quality USB drive. The file name must always be the same.
This means you have to make sure not to mix up different
firmware files on your computer. After the update is finished,
always check the version number on the start screen to be
sure the right version is installed.
STEP 2: PREPARE OVEN
Connect the USB drive to the USB port of the oven and
open the door. Disconnect the main power for 10 seconds.
Alternatively turn off the main circuit breaker for 10 seconds.
STEP 3: PERFORM UPDATE
Reconnect the main power and wait for 20 seconds. The
Update process starts instantly. The LED on the USB Drive
flashes fast, then stops, then flashes fast again, then stops
and flashes slowly (update finished).
During these 20 seconds:
•DONOTinterruptpower!
•DONOTremovetheUSBdrive!DONOTtouchany 
 buttons/switches!
STEP 4: RESET
After 20 seconds, when the LED on the USB drive flashes
slowly, remove the USB drive and close the door. Then
disconnect the main power again for 10 seconds.
STEP 5: POWER ON AND VERIFY
Connect the main power again. Then power on the control
panel. On the bottom of the start screen the current firmware
version is displayed.
Xcelerate™ Hi-Speed Oven
TOUCH SCREEN
FIRMWARE UPDATE
• Carefully read the entire document before trying to update the firmware.
• Not following these steps can damage the control board permanently.
• The update should only be performed by qualified service personnel.

XCELERATE SERVICE INSTRUCTIONS • XLSERVICE • 5.
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Xcelerate™ Hi-Speed Oven
CHANGE DOOR SWITCH
First check that the door is closing properly. If debris
builds up on the door it might not close properly and the
door switches are not activated properly.
STEP 1
Unplug, or disconnect the main power of the oven (not
onlythefuse!),thenopentheservicepanelontheright
side of the oven. Remove the top of the oven. The door
switch is located on the upper left corner of the electric
board. Open the door.
STEP 2
Disconnect the cables of the PCB. Disconnect the cables of the door switch.

XCELERATE SERVICE INSTRUCTIONS • XLSERVICE • 6
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Xcelerate™ Hi-Speed Oven
CHANGE DOOR SWITCH
STEP 5
Reinstall the electric board with the six screws. Then
reconnect the cables to the PCB (keypad cable black side
up).
STEP 3
Unscrew the six mounting screws of the electric board (two at the bottom, two at the upper left, two at the upper right).
Then carefully move the electric board towards you to gain access behind the electric board.
STEP 4
Now unscrew the four screws of the door switch assembly,
remove it and assemble the new door switch assembly.
Reassemble the four screws. But do not fully tighten the
screws at this point, so the new door switch can move
freely for later adjustment.

XCELERATE SERVICE INSTRUCTIONS • XLSERVICE • 7.
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Xcelerate™ Hi-Speed Oven
CHANGE DOOR SWITCH
STEP 6
Connect the cables back to the new door switch assembly. The cables are marked S11, S12, etc. The first two letters
indicate which switch to connect the cable to (S3 at the top, S1 at the bottom left, S2 at the bottom right). The third
number indicates which contact of each switch. (1 upper contact COM, 2 middle contact NO, 3 lower contact NC). For
example S11 has to be connected to the upper COM contact (1) of the Switch S1 at the bottom right.
STEP 7: ADJUSTING THE DOOR SWITCH
With everything back in place, the four screws of the
door switch have to be loose, otherwise the door switch
assembly might be damaged when closing the door. Slowly
close the door.
STEP 8
Push the upper switch towards the left until the trigger
of the switch just touches the outside of the switch. Do
not press so hard that the trigger bends over the housing
of the switch. When you have the right position, fix the
position with the screw. Repeat with the lower switches.
Push the assembly to the right position where the trigger
starts to touch the housing and tighten the screws.

XCELERATE SERVICE INSTRUCTIONS • XLSERVICE • 8
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STEP 9: CHECK THE SWITCHING SEQUENCE
Open and close the door very slowly, so you hear the ‘click’ noise of the switches three times. Also watch the
switches.
STEP 8: CONTINUED
Xcelerate™ Hi-Speed Oven
CHANGE DOOR SWITCH
When closing the door S2 must ‘click’ first, after that S1 and S2 should ‘click’.
S2 is the safety switch. If S2 does not switch before S1 and S3 switch (‘click’), a short circuit will occur and circuit
breaker F1 will trip. This mechanism is an international standard that disables microwave operation if there is a
malfunction of a switch or the adjustment is not correct.
If this type of short circuit occurs more than two or three times, switch S2 is likely damaged and must be replaced
again.
When you are sure the switch activation sequence is correct, you can apply power to the oven. Place a glass of water
in the oven, start a cooking sequence that includes the use of microwave power and slowly open the door. If all works
fine, open the door quickly. If the adjustment is correct the oven will work normally. If F1 trips while opening the door,
checktheswitchesagain.Alwaysdisconnectthemainpowerplugwhenworkingonthedoorswitch!

XCELERATE SERVICE INSTRUCTIONS • XLSERVICE • 9.
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Xcelerate™ Hi-Speed Oven
CHANGE MOTOR
STEP 1
Dismantle three cables (black/blue/white) from Inverter
STEP 2
Use the tool to loosen 4 screws around the motor and
then dismantle the isolation material
STEP 3
Loosen 2 screws from magnetron and dismantle the small
stainless steel panel

XCELERATE SERVICE INSTRUCTIONS • XLSERVICE • 10
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STEP 4
Use a wrench tool to loosen 8 screws from motor.
Afterwards, you can dismantle the motor from the
machine.
CHECK THE TURNING DIRECTION
When the frequency inverter has been connected start the
oven then quickly open the door, to stop the fan.
Standing behind the oven you can observe the motor
turning when it slows down (see green arrow).
The turning direction must be counter clockwise looking
from behind the oven (see red arrow)
If the motor is turning in the wrong direction, swap the
sequence of two of the motor cables, for example from
white-blue-black change to blue-white-black.
Xcelerate™ Hi-Speed Oven
CHANGE MOTOR

XCELERATE SERVICE INSTRUCTIONS • XLSERVICE • 11.
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Xcelerate™ Hi-Speed Oven
CHANGE PCB
STEP 1
Unplug the oven or disconnect the main power to the oven
(notonlythefuse!),thenopentheservicepanelonthe
right. The PCB is located on the lower left of the electric
board.
STEP 2
Disconnect the green plugs of the PCB.
STEP 3
Disconnect the gray display cable.
STEP 4
Disconnect the USB cable
STEP 5
Carefully disconnect the keypad cable at the bottom.
STEP 6
Now the control box at the front has to be removed.
Unscrew the two screws at the bottom of the control box.

XCELERATE SERVICE INSTRUCTIONS • XLSERVICE • 12
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STEP 7
The control box then needs to be slid upwards.
STEP 8
Unplug the small white display cable. Now the control
box can be removed.
STEP 9
Unscrew the four screws of the PCB on the electric
board and remove it. Assemble the new PCB.
STEP 10
Reconnect the white cable of the display and reassemble
the control box.
Xcelerate™ Hi-Speed Oven
CHANGE PCB

XCELERATE SERVICE INSTRUCTIONS • XLSERVICE • 13.
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STEP 11
Reconnect all cables of the PCB. Caution: Ensure power to
the PCB is connected correctly or damage to the PCB will
occur.
Xcelerate™ Hi-Speed Oven
CHANGE PCB
All plugs have a clear direction, except the green-black
keypad cable at the bottom. The black mesh must face
upwards. Check that all pins are connected, that none are
free or loose.
If connected wrong, the buttons of the keypad cannot
work.
Reassemble the oven and test all functions:
• Display works?
• Temperature reading is correct?
• USB transfer can work?
• All keys work?
• Speaker works after end of baking time?

XCELERATE SERVICE INSTRUCTIONS • XLSERVICE • 14
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STEP 1
If the Alarm is not working first check in Service mode
that Speaker Volume is not set to 0.
Check if the oven cooling fan is working and the
ventilation is sufficient. If the oven overheats the speaker
can be damaged.
If the speaker is still not working unplug the unit or
disconnect the main power of the oven, then open the
service panel on the right. The Speaker is located on the
bottom next to the PCB.
STEP 2
Cut the white cable tie so the two cables of the speaker are free.
Then unplug the double plug of the speaker from the PCB.
Xcelerate™ Hi-Speed Oven
CHANGE SPEAKER

XCELERATE SERVICE INSTRUCTIONS • XLSERVICE • 15.
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Xcelerate™ Hi-Speed Oven
CHANGE SPEAKER
STEP 4
Install the new speaker and reconnect it to the PCB. A111 is the upper cable; A112 is the cable at the bottom
of the plug.
If the new speaker does not work exchange the PCB (separate instruction).
STEP 3
Unscrew the two red cables A111 and A112 from the plug. Take the plug and attach it to the new speaker.
Unscrew the four screws of the old speaker and remove it from the oven.

XCELERATE SERVICE INSTRUCTIONS • XLSERVICE • 16
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Xcelerate™ Hi-Speed Oven
CHECK MICROWAVE
1. WATER HEATING TEST 1 LITER, 2 MINUTES
a. 59°F (15°C) warmer: Normal
b. 32°F (0°C) warmer: likely Mic Control problem, connection, capacitor or diode defective
c. 41°F (5°C) warmer: likely Magnetron or Diode defective
2. MEASURE MICROWAVE CURRENT S32
a. 6A-8A: Normal
b. 0A: Connection loose, Microwave Control problem, Transformer short circuit, Door Switch
problem, Diode defective
c. 3A: Likely Diode defective, exchange
d. 4-5A: Likely Capacitor defective, exchange
e. 12A: Likely Magnetron defective, exchange
3. CHECK MICROWAVE CONTROL (PCB, DOOR SWITCH, MICROWAVE CONTACTOR)
4. CHECK TRANSFORMER
5. CHANGE DIODE AND CAPACITOR
6. CHANGE MAGNETRON

XCELERATE SERVICE INSTRUCTIONS • XLSERVICE • 17.
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Xcelerate™ Hi-Speed Oven
CHECK MICROWAVE
STEP 1: TEST HEATING FUNCTION
Cool down the oven and set “SET TEMP” in “SERVICE
MODE” to 68°F (20°C) to deactivate convection heating.
STEP 4
When finished stir the water a bit and measure the
temperature again. The water should be approximately
59°F (15°C) warmer than before. This value may vary
depending on ambient temperature, line voltage and
water container. If you have this temperature increase the
Microwave works properly.
If there is a problem with the microwave you will not have
a temperature increase at all or only a minor increase of
less than 41°F (5°C). In this case continue with amps
measurement.
STEP 5: AMP MEASUREMENT
Disconnect the main power. Open the right side panel of
the oven. Clamp your amp meter to the cable S32 near
the door switch. (Do not measure near the transformer
or microwave. The voltage, high frequency and magnetic
fields can interfere and prevent getting an accurate
reading).
STEP 2
Place a plastic bowl with about one liter of water into the
baking chamber. Measure and note the temperature.
STEP 3
Go to “MANUAL MODE” and set the parameters
TIME 2:00 Minutes TEMP 68°F (20°C)
AIR 10% MIC 100%
then press “START”

XCELERATE SERVICE INSTRUCTIONS • XLSERVICE • 18
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STEP 6
Power the oven back on, place a cup of water inside the
oven, then start the microwave. Normally there should
be 6 to 8 Amps going through S32, and all microwave
components are working properly. If the water still does
not heat check if the antenna in the top of the baking
chamber is installed properly.
If you measure a current higher closer to 12A the
magnetron is likely faulty or broken. Alternatively,
the transformer could also be damaged. Change the
magnetron first then the transformer since the magnetron
is most likely to fail.
If the measure is a lower current closer to 3A, it is likely
the diode is damaged or broken.
If the measure is 4 – 5A, it is likely the capacitor is
damaged or broken.
Finally if there is no current at all, please check for lose
cable connection or that all door switches are properly
closed.
These are the components most likely to be affected
but are by no means the only components that may be
affected.
STEP 7: CHECKING THE CONTROL CIRCUIT
Disconnect the oven from the main power. Remove the
cables T2L and T2N from the transformer and connect
your volt meter.
STEP 8
Power the oven back on, close the door and start
microwave operation. When you start you should measure
line voltage at the cables T2L and T2N. Then the
microwave circuit is supplied with power correctly and
proceed with STEP 9.
If there is no voltage when the microwave function is
started, check if the microwave output of the control PCB
is active. If not, the door switch input of the PCB may
not be active. Check K2 and S1, which produce the input
signal. It is very unlikely the PCB itself has a problem,
andthereusuallyisnoneedtochangethePCB!
Check if Relays/Contactor K1 is working.
Check the function and adjustment of the door switch
assembly.
Xcelerate™ Hi-Speed Oven
CHECK MICROWAVE