Instant Burger®Service Manual
Contents
1.2. 14 How To Replace Circuit IILI UI 15 How To Replace Terminal Oi U ULU 16 How To Adjust Top Hamdlg UQULLU IIIa nro Pra 16 How Te Adjust Top Hinge us IILI 16 M sp Pp dude S SA 17 Limited nn Ta aec coat SSI Outside Back Cover DESCRIPTION OF MODELS This service manual is written for models A975 and A980 series The difference in the two models is that the A980 does not have slide adjustment brackets as it was designed for situations where adjustments are not needed There is an older model A975 and a newer model A975 The older model A975 has a Rare Well Done adjustment control See figure 1 On the newer model A975 this control was removed See figure 2 The degree of doneness is now factory set at Well Done This is a requirement of most health departments Both the older A975 and newer models have slide adjustment brackets for adjusting the thickness of the hamburger On the A980 the thickness of the hamburger is factory set for a one quarter pound hamburger and is not adjustable The A980 has been discontinued since there is so little difference between the A980 and the newer model A975 How do you tell the difference between the models 1 The older model A975 is readily identifiable by the Rare Well Done knob on the front control panel If you lift the cover you will also see adjustment slide brackets for adjusting
3. Hinges Page 16 The side with the gap will cook first leaving the opposite side slightly undone Check hinges on back of lid to see if their loose This can cause the same condition B Solution 1 Make sure the top plate is installed correctly Make sure that the bottom grooves of the top plate mate with the clips on the top cover If the bottom right side or left side or both sides rest on top of the clips rather than the grooves the meat will not cook evenly on both sides 2 Put slide adjustment brackets in some holes and setting 3 Replace badly worn plates 4 Adjust handle or hinges TROUBLE VI HAVE TO PUSH START BUTTON SEVERAL TIMES FOR FURTHER T ET GER DO INF TIONS A Test 1 Measure voltage at outlet while not cooking Should be line voltage 115V approximately 2 Measure voltage at outlet while cooking voltage should not drop below 110V B Solution 1 Run separate circuit using at least 10 type TW wire or 12 type THHN wire Must be protected with a 30 amp breaker 2 Check plug Be sure wires are not clamped on insulation 3 Do not operate Instant Burger on an extension cord It must be operated on a 30 amp dedicated circuit TROUBLE V COOKS FOR 5 SECONDS AT WELL DONE FOR FURTHER POSITION THEN TURNS OFE INFORMATION A Test 1 Run preliminary test Amber light should stay on in Well Done position Go to B Solution 1 B Solution 1 Replace printed circuit board S
4. still energized and it will not cut off 6 After counting to 10 slide the switch on the hair dryer to Medium The amber light on the control board should go off and the hair dryer should stop running immediately If it does the board is functioning properly on Hamburger and the Triacs are functioning properly TE the dryer comes on immediately without pressing the start button and the green light is in the ready position the Triacs bad Go to Triac Test find and replace defective Triac s If the dryer will not come on when the Start button is pushed the board is most likely defective Replace it To run the Second Test This test allows you to test the chicken circuit 1 Switch the hair dryer to High 2 Switch the Hamburger Chicken switch to Chicken 3 Press the start button The hair drver should run 4 Time for approximately 10 seconds and then slide the switch to Medium There should be a slight delay in time that you switch the hair dryer to Medium and the time that the amber light goes out and the hair dryer will stop If it occurs the control board is working fine The Triacs are working fine You may also adapt the hair dryer to check the control box by itself This may be done by attaching two 12 solid wires on each end as follows Strip both ends on wire back by 4 inch Place yellow slip on connectors on every end 4 of the wires and crimp Place yellow slip on connectors on the bl
5. 2 each 6 x 5 8 self tapping screws from connector block Turn machine rightside up and open lid Replace old connector block with new one Turn machine upside down and attach 2 each 6 x 5 8 self tapping screws Connect two terminals to connector block Replace connector block baffle with 2 each 10 24 nuts Replace bottom cover with 6 each 6 32 screws Turn machine rightside up and plug into power source Run Load Test See Page 6 HOW TO REPLACE CIRCUIT BOARD See Figure 7 8 amp 9 CIRCUIT BOARD CIRCUIT BOARD PT NO 3700 4975 REMOVED 5 Remove wire through coil by removing yellow terminal from terminal block and pulling end through hole in current bn 632 NUT transformer Note this terminal 1s smaller and can be pulled through current coll hole 6 Disconnect red receptacle from plug at the bottom of the printed circuit board J1 WIRE THRU COIL W TRM A975 PT NO 3635 TRANSFORMER 7 Remove Rare Well Done control knob part no 3159 using 050 hex allen wrench to loosen the set screw holding it to the me dod Figure 7 8 Remove 3 each 6 32 nuts holding circuit board 9 Remove circuit board by pulling out 10 Replace with board with 3 nuts to hold board in place 11 Reconnect red receptacle to plug at bottom of new board J1 12 Put wire through coil and connect yellow terminal back to correct terminal on terminal block See Figure 8 13 Replace Rare W
6. the current through the hamburger meat is presented to the board through the current transformer While in the Hamburger mode the hamburger circuit detects an increasing current peak current and decreasing current As long as the current is increasing the circuit will stay on As soon as the current reaches the peak and starts to decline the printed circuit board stops the flow of electricity thus stopping the cooking action at the peak of doneness This degree of doneness for hamburgers can be varied from rare to well done It is important lo know that rare does not mean burnt on the outside and pink in the middle Since the current flows evenly throughout the hamburger rare will mean pink all the way through By the same token well done means the same degree of doneness all the way through the meat The chicken circuit works just slightly different The chicken current also detects the current through the chicken breast It then remembers the peak and then stops the cooking action at a preset value below that peak There are some generalizations that may be stated about the operation of the Instant Burger in the cooking process 1 The thinner the hamburger and the greater the area of a cooking surface the greater the flow of electricity through the hamburger Hence you need the 30 amp breaker if you re going to be cooking thin hamburgers However at the thinnest setting 1 4 thickness the largest hamburger coo
7. the thickness of the hamburger See figure 1 2 Newer models of the A975 have the Rare Well Done control removed from the printed circuit board See figure 2 Hence it will not appear However if you open the cover you will still see the adjustment slide brackets for adjusting the thickness of the hamburger 3 The A980 may be identified easily because it has neither the Rare Well Done control nor the adjustment slide brackets IMPORTANT This service manual is written such that the Rare Well Done control is still on the machine Anytime this service manual refers to the Rare Well Done control or knob it will be italicized If you are servicing an A980 or newer model A975 without the Rare Well Done potentiometer simply skip the italicized portion and go to the next paragraph or un italicized portion of the service instructions Rare Well Done Figure 1 Adjustment Knob Figure 2 DESCRIPTION OF OPERATION The Instant Burger represents the latest in modern cooking technology Ituses a new scientific method of direct energv transfer to cook the meat Rather than using electricity to heat up an element to heat up a griddle to heat up a hamburger the Instant Burger passes the energy directly through the hamburger and causes it to heat itself It does this economically automatically and in a fraction of the time necessary to cook hamburgers by ordinary methods In operation the ha
8. 2 Depress Start switch 3 Amber light should come on and stay on for approximately four seconds At the same time voltmeter should read line voltage 115 volts After approximately four seconds amber light should go off and green light come on and the beeper will sound The voltmeter should drop to approximately zero volts 4 Turn Rare Well Done knob to well done position 5 Press Start button and amber light should come on and stay on past ten seconds Voltmeter should read line voltage 6 Turn Rare Well Done knob towards the Rare position and light should switch from amber to green the beeper sounds and at the same time line voltage should drop to approximately zero volts on voltmeter This should occur at around the 12 o clock position of the Rare Well Done knob 7 Turn power switch off then turn back on Green ready light should be restored and voltmeter should read zero volts at power block If unit performs these tests satisfactorily then unit is ready to operate If the unit s power connector block prongs will mate properly with the unit should operate correctly If not align prongs LOAD TEST The Load Test is a better test than the Ouick Check as it provides a definite test as to whether the board and the Triacs are working The equipment needed is a hair blow dryer of about 1800 watts This will put a load on the machine of about 16 amps which is just as little less than that w
9. ANDLE Open lid and loosen 1 4 20 bolt with 7 16 socket wrench Push handle and bolts to the top of the slotted hole Lightly tighten bolt on both sides Close cover Handle catches should be riding on top of bottom console just above the slots Take a hammer and a piece of wood and tap the top of the handle on one side until it just barely latches in the slot Repeat process for the other side Open lid and tighten bolts very tight Close lid to see if it will latch If it won t repeat the process HOW TO ADJUST TOP HINGES If the top hinges are too loose it will allow the top to come up a little bit when cooking thereby changing the spacing on the hamburger This will cause uneven cooking To adjust the top hinge loosen both lock nuts on hinge bolt Use 7 16 Spin Tite and 7 16 socket wrench Tighten 1 4 20 bolt until tight with Spin Tite wrench Loosen one quarter turn Then tighten lock nut very tight while holding 1 4 20 bolt in place with wrench Do the same with the other hinge LI CIRCUITBOARD PT NO 3700 4975 amp A980 YELLOW WIRE FROM CIRCUIT BOARD CORD TO CONNECTOR BLOCK PT NO 3630 POWER CORD PT NO 3234 11 TO GOUND EARTH FROM CIRCUIT BOARD CURRENT TRANSFORMER MOUNTED ON PC BOARD TERMINAL BLOCK PT NO 3159 PT NO 3105 WIRE THRU COIL WTERM 975 PT NO 3635 THIS WIRE MUST RUN THRU HOLE IN CURRENT TRANSFORMER ONIYIM
10. AWS 04 1010 COPYRIGHT 1995 SMOKAROMA INC SMOKAROMA INC P O Box 25 Boley Oklahoma 74829 Phone 918 667 3341 Fax 918 667 3935 Email info smokaroma com Revised 1 06 TABLE OF CONTENTS 2005 Description OL a r n tama 1 TO OB u U U isnt TR 2 Care and Cleaning of the Instant Burger 2 Parts Tor A975 and A980 Instant Burger LU u Ra 3 Deseripitem ef PRYDL eee I SIIM 4 How the Printed Circuit Board Works eee I I U natns 5 Quick Check for Function Cmo u eitamine ise 6 Poad DES eser E RT EROR Med Uo A 6 c a p Bcc EEG 7 Qus o M quit dece e miu 8 Trae TES SAA pP lll l III ss Mm 8 9 Trouble Shooting aue n LLL L ul l u s s 10 12 I Cooks all the time when lid is closed II Hamburger overcooking and sticks to top plate III Hamburger cooks on one side of plate and but not the other IV Have to push start button several times to get hamburger done V Cooks for 5 seconds at Well Done then turns off VI Power light green is on but won t cook when red button is pushed VII Cooks all the time unless Rare Well Done Knob is in rare position VIII Meat green on one side and raw on the other side How To Replaee Triacs nasman a mats 13 How To Replace Power Connector Block
11. CHICKEN SWITCH Select hamburger or chicken mode of cooking POWER kx H m 3 START SWITCH ox suem Starts cooking cvcle when pressed ki H 4 GREEN LIGHT M M Indicates machine is on When sequenced from green to amber 5 and then back to green it indicates that power has been applied amber on green off and then removed amber off green on In that sequence it indicates that the meat is done 5 AMBER LIGHT Indicates when circuit board tells Triacs to apply power to power connector block and therefore indicates meat is cooking 6 DONENESS CONTROL Used to set degree of doneness from Rare to Well Done This control will not appear on the A980 or later model A975 7 PRINTED CIRCUIT BOARD PART NO 3700 A975 amp A980 Controls cooking cycle Beeper signals end of cycle 8 TRIACS PART NO 3105 Applies power to power connector block for cooking when signaled by circuit board 9 CURRENT DETECTION TRANSFORMER MOUNTED ON PC BOARD Used to monitor current flow during cooking cycle and feed a reflection voltage to the printed circuit board 10 POWER CONNECTOR BLOCK ASSEMBLY PART NO 3570 Applies voltage to Top Plates meat when lid is closed 11 TERMINAL BLOCK PART NO 3159 Provides junction for connecting wires 12 PLASTIC BACKING SHEET PART NO 3515 Provides insulation protection between plates and metal cover Caution Do not operate unit without this part in place HOW THE P
12. RINTED CIRCUIT BOARDS WORKS Itis important that the service person understands the operation of the printed circuit board and how it senses the degree of doneness As we have said earlier the Instant Burger uses the scientific method of direct energy transfer to cook the meat This means that the current goes directly through the meat and the resistance of the meat causes the meat only to heat up There is a unique curve of the current over time which permits the printed circuit board to detect the degree of doneness The current starts at about zero because of the high resistance of the meat As the meat heats up the resistance drops gradually and the current increases The current increases to a peak as the meat continues to cook and then the resistance suddenly reverses and become high Thus the current will drop rather sharply to almost zero amps The peak current can be as high as 31 to 35 amps However this will not trip a 30 amp circuit because it s only there for a few seconds Basically the printed circuit board is an On Off switch The printed circuit board has two unique circuits on it One for hamburger and one for chicken The two meats have difference cooking characteristics There is a current transformer through which one of the wires pass from the Triac to the terminal block This wire carries the current which goes through the two hamburgers or chicken breast which are in series with each other Thus a reflection of
13. ade of the dryer plug Place the other yellow connectors on the two terminals where the cord to the connector block would normally connect to the terminal block See figure 10 and part 23630 SETTING THE BOARD Sometimes the control board will need setting in the field One symptom of this is when the control board stops the cooking and the hamburger is not quite done The equipment needed is a voltmeter which will measure DC volts as low as 0 2 volts or 200 millivolts There are two test points on the control board There is no need to remove to control board from the control box to set it With the control box facing you and looking over the back of the control board the first test point is a ground on the board Use the board ground only It is located in the extreme upper left hand corner of the board and will say GND The second test point is down close to a blue or brown rectangular potentiometer with a small adjustment screw on it The test point will be located just above this rectangle potentiometer and two resistors It is labeled TEST Plug in control box and turn on power Use extreme caution for the potential for being shocked is present To reset the board place your black lead on the GND test point and red lead on the TEST point Take a small screwdriver and adjust the adjustment screw on the rectangle potentiometer until the meter reads 0 290 005 volts DC with the Rare Well Done Knob in the Well D
14. ckets only If they are too far to one side and rest on the bottom console replace tub TROUBLE HAMBURGER COOKS ON ONE SIDE OF PLATE BUT NOT THE OTHER PROBABLE CAUSE TOP PLATE NOT PARALLEL WITH BOTTOM PLATE A Test 1 Cook using hamburger 2 Observe which side is cooking Generally the thicker hamburger will cook faster controlling the current thus stopping the cooking before the other side thinner hamburger is done The undone hamburger may be partially cooked and will feel warm to touch but may look raw 3 Check top plate installation by inserting fingers of the right hand on the right side and the fingers or the left hand on the left side underneath stainless steel part of the top plate at the bottom Exert a little pressure with the fingers attempting to lift the plate away from the surface of the cover If the plate moves out from the top cover more than a quarter of an inch the top plate is not secure in the clips If this is the case remove the top plate and install correctly 4 Check adjustment slide brackets and make sure they are on the same setting Also make sure each bracket is in the same hole and the slide bracket is not slanted 5 Close top and check top for gap by pulling up on one side of the Sce How to Adjust handle and then the other side Ifa gap appears then the handle Handle Page 16 needs to be adjusted See How to Adjust Ifa gap appeared it could cause a hamburger to cook unevenly
15. ee Figure 8 Page 15 TROUBLE VL POWER LIGHT GREEN IS ON BUT WON T COOK WHEN RED BUTTON IS PUSHED A Test l 2 3 TROUBLE VIL COOKS ALL THE TIME UNLESS RARE WELL DONE Remove control box and check for loose wires Turn Rare Well Done knob to Well Done position Depress start switch red button Amber light should come on Measure voltage at point where cord to connector block connects to the terminal block Should measure line voltage If not check triacs If triacs test bad replace If triacs test good replace board If line voltage is read across the two terminals on terminal block of the cord to connector block then check continuity of the cord to the connector block If wire in cord is broken replace cord If good replace power connector block FOR FURTHER FORMATION SEE See Control Box Wiring Figure 11 Page 17 See Triac Test Figure 4 Page 9 See How to Replace Circuit Board Page 15 See How to Replace Circuit Board Page 15 See How to Replace Power Connector Block Page 14 KNOB IS IN RARE POSITION B Solution 1 Replace printed circuit board FOR FURTHER INFORMATION SEE See Figure 8 Page 15 FOR FURTHER OTHER SIDE INFORMATION SEE A Test Check both Triacs before starting test and replace 1 if defective Unit plugged in Power switch is in OFF position 2 Check for loose co
16. ell Done control knob Align in Well Done position and tighten ka set screw with 050 hex allen wrench I Unplug unit New Mode Figure 9 f 14 Replace control box using 4 each 6 32 screws 2 Turn machine upside down 15 Turn Instant Burger upright 3 Remove 4 each 6 32 screws from contol box 16 Plug into power source 4 Remove control box 17 Run Load Test See Page 6 HOW TO REPLACE TERMINAL BLOCK See Figure 10 1 2 CORD TO CONNECTOR BLOCK 6 32 SCREW POWER CORD WIRE THRL COIL PT NO QM PLN 4 WHITE WIRE TO PC BOARD BLACK WIRE TO PC BOARD 5 GREEN WIRE TUMPER WIRE TO GROUND EARTH TOTRIAC TERMINAL BLOCK 6 PT NO 3640 PT NO 3159 i Figure 10 7 8 9 Unplug unit Turn machine upside down and remove control box by removing 4 each 6 32 screws Remove wires from old terminal biock and place on new terminal block one wire at a time until all wires are on new block see Figure 10 Remove 2 each 6 32 screws holding old terminal block to bottom of cabinet and remove old terminal block Attach new terminal block to cabinet using 2 each 6 32 screws Check circuit board and terminal block wiring according to Figure 10 amp 11 Replace control box using 4 each 6 32 screws Turn machine right side up and plug into power source Perform load test on page 6 If machine passes Load Test then it is ready for operation HOW TO ADJUST TOP H
17. eter to lowest setting probably 200 OHMS Terminals are labeled 1 2 and 3 with small terminal as 1 and continuing counting clockwise Note The numeral 1 2 3 are not marked on the Triac but are used just to identify the terminals 2 Make each test shown in the 3 steps shown fig 4 3 If Triac tests bad in any one of these 3 steps Triac is bad discard 4 If the Triac tests good in all 3 steps Triac is good keep Remember triac must test good in all 3 steps to be good NOTES 1 Older Triacs slotted screw hole one end Continuity meter reading on step No 1 on good will read about 28 OHMS 2 Newer Triacs round hole both ends Continuity meter reading on step No on good will read about 62 5 OHMS 3 Continuity meter readings on bad may be anything but it is generally about 200 OHMS 4 No Continuity meter reading will generally read OL on newer meters and 1 on older meters 5 This method oftesting Triacs is very effective in determining defective Triac when the symptom is cooking all the time However it will not determine all the defects in a Triac When trouble persists replace both Triacs STEP METER READING TERT Figure 4 Step J If the meter reading shows continuity the test is good f the meter reading shows no continuity the Triac is bad Discard the triac Continue throug
18. h the next 2 steps Step 2 If the meter reading shows no continuity the test is good If the meter reading shows continuity the Triac is bad Discard the Triac Continue through the next step Step 3 If the meter reads no continuity the test is good and the Triac is good If the meter reads continuity the Triac is is Discard the Triac TROUBLE SHOOTING OUTLINE TROUBLE 1 COOKS ALL THE TIME WHEN LID IS CLOSED FOR FURTHER INFORMATION SEE A Test 1 Unit plugged in Make sure power switch is in OFF position 2 Measure voltage at power connector block If it reads line voltage 115V approximately then one or both Triac may be defective B Solution 1 Check Triacs and replace defective Triac See Triac Test and Figure 4 Page 9 2 Start Push button stuck Unstick or replace circuit board See Figure 8 amp 9 Page 15 TROUBLE HAMBURGER OVER COOKING AND STICKS FOR FURTHER TO TOP PLATE INFORMATION SEE A Test Cook with hamburger B Solution 1 Clean plate shiny with Scotch Brite maroon pad 2 Make sure Hamburger Chicken switch is in the Hamburger position 3 Test Triacs for bad Triac and replace if defective See Triac Test Figure 4 Page 9 See Figure 5 Page 13 4 Check drippings tub and make sure drain slot wide space on back of tub when bottom plate is in place is toward back with tub in place Check tub adjustment steps and make sure they rest on the adjustment slide bra
19. hen cooking a 3 2 ounce hamburger The hair dryer must have a switch with High Medium Low and Off in that sequence There are two tests First you need to adapt the plug in of the hair dryer such that it will mate with the power connector block of the Instant Burger This may be done by attaching two 12 solid wires the kind used in house wiring on each end as follows Strip end on each wire back of an inch Strip the other end by 4 inch Place yellow slip on connectors on inch end of wire and then crimp Place yellow slip on connectors on the blade of the dryer plug You may have to grind down the blades for the yellow connectors to fit To run the first test This test allows you to test the hamburger circuit 1 Place the 74 inch bare end into the power connector block of the Instant Burger Omit steps 3 amp 4 if the unit does not have a Rare Well Done Control 2 Place the switch on the hair dryer to High 3 Place the Rare Well Done Knob in the Rare position Press the Start button The hair dryer should start running It should stay on approximately 5 seconds and then automatically cutoff by itself 4 Turn the Rare Well Done Knob to the full Well Done position 5 Press the Start button the hair dryer should come on and stay on for at least 10 seconds You should count to 10 because if you attempt to turn it off prematurely during the time the 5 second timer is
20. ked should be a 2 3 ounce burger Do not try to cook anything larger than 2 3 ounce hamburgers at this setting If you do you risk breaking the hinges trying to squash the hamburger down to this thickness The unit will also draw too much current and trip the breaker 2 Since each hamburger receives the same amount of current they must be the same size portion controlled with the scoop in order to cook evenly 3 The plates must be parallel to cook the hamburgers evenly even if they are the same weight For example If the slide adjustment brackets are on different settings on each side one side will form a thicker hamburger than the other The thicker hamburger will cook quicker than the thinner hamburger and control the circuit to stop the cooking action The thicker hamburger will appear to be done and the thinner hamburger which was not sufficiently cooked will be warm but may look raw With a little understanding on how the unit works and a little common sense the Instant Burger is simple to repair QUICK CHECK FOR FUNCTION OF CONTROLS The following is a method of performing a quick check on the Instant Burger to see if it is functioning correctly It mainiy consists of visual checks and requires no special tools except a voltmeter Before performing this test the top needs to be open and the voltmeter prongs plugged into each of the power connector block receptacles 1 Turn Rare Well Done knob to Rare position
21. mburgers either in a ball or preformed patties are placed on the bottom plates The cover is closed The operator presets the Degree of Doneness dial between rare and CARE amp CLEANING OF INSTANT BURGER See Figure J Proper cleaning is essential to the maintenance of your INSTANT BURGER The entire machine should be wiped clean at the end of each day s service In addition the top and bottom plates and plastic drip pan should be cleaned any time the Instant Burger is to be out of service for more than one hour These parts may be removed and immersed in soapy water for cleaning See Operations and Merchandising manual for proper procedure Top and bottom plates should be scrubbed clean with a Scotch Brite or similar pad All other parts may be cleaned using soap and water and a nonabrasive pad Special care should be taken to make sure no grease or water enters the control housing The model comes equipped for use with a 115 single phase 30 amp individual circuit and must bo well On the A980 and newer model A975 this control has been removed and the control board preset at Well Done A sophisticated electronic brain then takes over and monitors the energy to the hamburgers and automatically stops when done The result is a less fatty and a delicious tasting product This is especially true since no oil or grease is used to cook the hamburgers The unit can cook practically any type of ground or te
22. nderized beef It can also cook small boneless steaks such as rib eyes eye of round etc It can also be used to cook sausage patties and other types of ground meat It will also re heat whole precooked chicken breast and hot dogs Figure 3 be grounded All parts which come in contact with meat should be cleaned and disinfected according to the Operations and Merchandising Manual HAMBURGER COOKER 3105 TRIAC DESCRIPTION 3159 TERMINAL BLOCK 3445 ADJUSTMENT SLIDE BRACKET A975 ONLY 3450 BOTTOM PLATE A950 A975 A980 3460 TOP PLATE A950 A975 A980 3510 KNOBS A950 A975 A980 3515 BACKING SHEET 3565 CONTAC T BLADE 3570 POWER CONNECTOR BLOCK ASSEMBLY 3575 CONNECTOR BLOCK CONTACTS A975 A980 3630 CORD TO CONNECTOR BLOCK AND TO TERMINAL BLOCK 3636 WIRE THRU COIL 3640 JUMPER WIRES FOR TRIACS 3700 CIRCUIT BOARD A975 A980 Both models use the same board Neither will have Rare Well Done Control on it 3720 CONTROL BOX A975 A980 5 ri p di 3510 3445 Old Model New Model 8 8 rii i si 10 of NO REQ N e NOS Be 10 PARTS FOR NEW 975 amp A980 INSTANT BURGER PART NO UNIT EA EA EA BA EA EA EA EA EA BA EA EA EA EA EA DESCRIPTION OF PARTS 1 POWER SWITCH Applies power to Printed Circuit Board D 2 HAMBURGER
23. nnections at small blue terminal on both Triacs 3 Call factory B Solution 1 Recrimp blue terminals on wires to small terminal on Triacs See Triac Test Figure 4 Page 8 Go to B Solution 1 See Control Box Wiring Figure 11 Page 17 HOW TO REPLACE TRIACS See Fig 5 POSITION SCREW SMALL PRONG TOWARD FRONT Figure 5 1 Unplug unit 2 Turn unit upside down and remove control box by removing 4 each 6 32 screws 3 Turn control box right side up 4 Remove 2 each 6 32 screws from each Triac 5 Coat bottom of new Triac with transistor silicone grease heat sink compound This assures good heat transfer from the Triac to the heat sink 6 With new Triac in hand remove wires individually from terminals and place on identical terminal of new triac See fig 5 See Control box wiring Figure 11 page 17 to check correct wiring 7 Attach new Triacs to aluminum heat sink with 6 32 screws 8 Replace control box using 4 each 6 32 screws 9 Turn machine right side up and plug into power source 10 Perform Load Test on page 6 If machine passes Load Test then it is ready for operation 13 HOW TO REPLACE POWER CONNECTOR BLOCK See Figure 6 beu Unplug unit Turn machine upside down and remove bottom cover by removing 6 each 6 32 screws Remove connector block baffle by removing 2 each 10 24 nuts Remove two terminals from connector block Remove
24. one position If there is no Rare Well Done Knob the unit will be in the Well Done position Set the potentiometer at 40 290 005 volts DC Do not try to set the board above this voltage in order to make the board stay on longer It will cause your hamburger to over cook and start stinking TRIACS The Triacs are the little rectangular objects with 3 prongs on them There are two Triacs They are labeled no 8 inthe description of parts The Triacs are used in this particular case as an electronic relay They are switched on when the red button is pressed indicating that cooking should start The triacs carry the heavy current through the hamburgers and back to the neutral wire The two Triacs are connected in parallel in order to carry the current needed The Triacs are forced to carry current equally by forcing one Triacs to conduct a half cycle and the other conduct the opposite half cycle Triac generally fail closed When this happens the unit will cook as soon as the cover is closed without pressing the red button It will also continue to cook even though the amber light may go off and the beeper will beep signaling what should be the end of the cooking However it will continue and to cook the hamburger and they will eventually start to smell Generally only one Triac burns out The one that has failed may be determined by the following test TRIAC TEST INSTRUCTIONS 1 Align Triac with small terminal toward you Set ohmm
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