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Service Manual - Whaley Food Service

1. Grada AJEeDId3l GODIN Grada HTrisin BLODGETT McDonalds UNIVERSAL HOLDING SERVICE AND REPAIR MANUAL BLODGETT OVEN COMPANY www blodgett com 44 Lakeside Avenue Burlington Vermont 05401 USA Telephone 800 331 5842 802 860 3700 Fax 802 864 0183 PN 33954 Rev B 6 01 M ede aS Blodgett Corporation All ri Some rved Duplication of the information in this ual is prohibited without the S Blodgett Service Department 1 TABLE OF CONTENTS INTRODUCTION DeSCrIDlOTn idu Re e me nately AA 1 1 Specifications eu te beu Rec 1 2 OPERATION Control Panel Descriptions 0 aaa 2 1 Operator Mode A t ML LC A 2 2 Timer Operation 5 Deseo Saranno 2 3 Meal Selection sane Lees ve ia tar een ew aaa eee GENE us 2 4 Clean tee RO ete 2 5 Slot On Off x rese RR a RU dae eke UU a dada od a va 2 6 Displaying Slot Temperature Information 2 7 Operating Tips e x et eR Pe Ee e be D teu E 2 8 Sequence of Operation 00 eee hn 2 9 PROGRAMMING AND CALIBRATION Store Manager Programming L ce 3 1 Product Selection for Each Slot 3 1 Entering and Editing
2. The display reads ALRM LoSP X Use the AR ROW KEYS to enter the desired low tempera ture alarm from 1 10 F Press the MENU KEY to advance the control The display reads ALRM HiSP X Use the AR ROW KEYS to enter the desired high tempera ture alarm from 1 10 F Press the MENU KEY to advance the control The display reads ALRM TIME X The alarm time allows an alarm condition to exist for up to 5 minutes before activating the audible alarm The default setting is 2 minutes Use the ARROW KEYS to enter the desired alarm time from 0 5 minutes Press the ENTER KEY to advance the control Press and hold the MENU key to exit program ming PROGRAMMING AND CALIBRATION HIGH AND LOW TEMPERATURE ALARM uo Use the arrow keys to enter desired low temperature alarm the range is 1 10 with a default of 10 Press and hold the menu key to exit programming FIGURE 18 This page intentionally left blank CHAPTER 4 TROUBLESHOOTING TROUBLESHOOTING ELEMENTS AND WARNING ALARMS CAUTION Due to electrostatically sensitive components All technicians performing ser vice work must be grounded Grounding may be accomplished using a grounding strap or other suitable means Connect to another grounded unpowered piece of eguipment ie eguipment other than the one you are currently working on During initial heat from a cold start the unit applies full voltage to the elements As the shelf ap proaches the
3. T 2 Press the MENU KEY to scroll to the slot on message TURN SLOT ON Press the ENTER KEY to enter the selection and return to the operator mode The display alternately reads SLOT TEMP LOW and the product selection until the temperature is with in normal operating limits NOTE If the enter key is not pressed within five seconds the slot returns to slot off ENTER zm 1 Press menu key to scroll to slot off message tE L Press enter key to turn slot off nz Hnc PAGE Press menu key to scroll to slot on message J Press enter key to turn slot on and return to normal display mode nE FIGURE 6 DISPLAYING SLOT TEMPERATURE INFORMATION 1 Pressthe TEMPERATURE KEY to scroll the fol e plate setpoint temperature lowing temperature information for each slot e Bottom plate setpoint temperature plate actual temperature 2 The display automatically returns to operator e Bottom plate actual temperature mode if no key is pressed for five seconds nz Press temperature key to display top plate temperature ns I Press temperature key to display bottom plate temperature HE 1 Press temperature key to display top plate setpoint temperature nz Press temperature key to display bottom plate setpoint temperature nz 0 Press temperature key to turn return to normal display mode nE FIGURE 7 OPERATING TIPS Correct heat and moisture levels are i
4. perature is lower than the setpointa negative offset is needed If the actual temperature is higher than the setpoint a positive offset is needed Use the surface probe to compare the top and bot tom temperatures to the setpoint value of 155 F 68 C Take all measurements from the slot center position Record the value Repeat for all slots If the actual temperature varies from the setpoint by 5 F 3 C adjust the temperature offset as follows 1 After accessing the service level program ming press the ENTER PAGE key to scroll to slot number requiring adjustment NOTE Itis possible to access all slots from any display 2 Press the MENU key to advance to top or bot tom of offset selection Use the ARROW keys to select the offset value Press the ENTER key to advance to the next slot Repeat for all slots 3 Press the MENU key for five seconds to exit service programming NOTE Itis not necessary to exit the program ming mode if you wish to advance to Display Test or Timer Test DISPLAY TEST MODE The display test verifies all display segments are operational NOTE Executing the display test requires access to level 5 programming Contact Blodgett Ser vice to acquire the necessary password 1 Press the ENTER PAGE key to scroll to TEST PAGE 2 Pressthe MENU KEY to scroll to DISPLAY TEST OFF 3 Press and hold the bottom two outside timers until the displays change All segments should illumina
5. LED board as shown Ribbon Cable Bezel Insert Mounting Screw underneath board Mounting Screw JO 6 Slide LED board under metal insert bezel Align the screws holes and attach the LED board FIGURE 2 MEMBRANE SWITCH 10 11 12 13 Remove the right and left hand exterior panels by removing the two lower phillips head screws Remove the top exterior panel by removing the two upper phillips head screws Loosen the two hex head bolts located on ei ther side of the bezel assembly Remove the bezel assembly Remove the two screws holding the LED as sembly to bezel Remove the membrane Switch ribbon cable from the LED board Remove the defective membrane switch from the bezel Clean all of the excess adhesive from the bez el Install the new membrane switch on the bezel Inspect the bezel gasket and replace if neces sary See Bezel Gasket Replacement on page 5 6 Install the membrane switch ribbon cable to the LED board See FIGURE 2 on page 5 3 for proper placement and attachment of the membrane switch ribbon cable Install the LED board into the bezel Install the bezel assembly on the frame by tightening the two hex head bolts located on either side of the bezel NOTE Be sure not to pinch the ribbon cable between the bezel and the shelf as sembly Install the side and top exterior panels of the unit Check the unit for proper operation PARTS REPL
6. blower from the bracket by remov ing the three phillips head screws Install the new blower on the bracket with the screws provided Install the blower and bracket into the unit frame Connect the black and white power wires to the blower motor Install the side and top exterior panels of the unit Check the unit for proper operation BEZEL ASSEMBLY Remove the right and left hand exterior panels by removing the two lower phillips head screws Remove the top exterior panel by removing the two upper phillips head screws Loosen the two hex head bolts at either side of the bezel assembly Remove the bezel from the shelf Remove the two screws attaching the LED as sembly to the bezel Remove the ribbon cable attaching the membrane switch to the LED as sembly Discard the bezel assembly Install the gasket into the new bezel assembly See Bezel Gasket Replacement on page 5 6 9 Install the membrane switch ribbon cable into the LED assembly Attach the LED assembly to the bezel with the two screws provided See FIGURE 2 for proper placement and attach ment of the membrane switch ribbon cable Install the bezel assembly on the frame by tightening the two hex head bolts located on either side of the bezel assembly NOTE Be sure not to pinch the ribbon cable between the bezel and the shelf as sembly Install the side and top exterior panels 10 Check the unit for proper operation Flip the
7. down with a pan of water then allow itto reheat As it s heating note the top and bot tom temps using your pyrometer As you note the temperatures read the probes resistance in 50 deg increments You should compare these readings with your probe chart Ifthey do not match run the test again If they still do not match the probe is going bad and the liner as sembly should be replaced TROUBLESHOOTING TROUBLESHOOTING THE DRIVER BOARD AND CONTROL The following is a test procedure to be used on the UHC 1 cabinet to determine if there is a problem with driver board the display control the control membranes or the connecting harnesses 1 Turn off power to the unit locate the driver board to the shelf to be tested disconnect the communications port this being the 18 pin connector with the blue jumper wire turn the power back on The shelf should now read Display Test Mode 2 Starting with the front left timer push ALL but tons one at a time in order with the last one be ing the right rear timer Each time you press a key the four DOTS at the bottom of the display will light up If at any time during this test you get a Key Press Error reset the unit by turn ing off then back on and start again If the Key Press Error comes up at the same place the unit did not see the previous key activate and thefollowing procedure should be considered A Clean the ribbon cable connections at the display control If the problem
8. for five minutes Dz Press up down arrow keys to scroll product selections Press up down arrow keys to nE Product Selections scroll product selections Press up down arrow keys to De Product Selections scroll product selections nE EXITING PROGRAM MODE Product Selections Press and hold the menu key for five seconds to exit program mode S Je FIGURE 3 PROGRAMMING AND CALIBRATION Sample product selection change This example changes the lunch product selection in the left position of slot 3 from 10 1 to NUGG Since the hold temperature for NUGG is different than 10 1 the center and right product selections are cleared Only items with hold temperatures within 5 F 2 8 C of the left product selection can be entered for the center and right position Press menu to key for five seconds to enter the program mode Selection Tray Position Press menu key to scroll meal selection and tray position He SAUSJS Meal Selection Tray Position Press menu key to scroll meal selection and tray position Selection Press menu key to scroll meal selection and tray position Press menu key to scroll meal selection and tray position Press and hold menu key for five seconds to exit program mode FIGURE 4 PROGRAMMING AND CALIBRATION ENTERING AND EDITING PRODUCT INFORMATION Changing or entering new product selections hold timer and tempe
9. for five seconds to exit the service level programming PROGRAMMING AND CALIBRATION OFFSET CALIBRATION Press the menu key for five seconds to exit service programming FIGURE 13 DISPLAY TEST leo e Press the menu key for five seconds to exit service programming FIGURE 14 PROGRAMMING AND CALIBRATION TIMER FAST TEST ML Jg Press any timer key to activate and verify the timer count down while in seconds mode Press the menu key for 5 seconds to re enter the program mode Access the service level programming CHANGING FROM F TO The following changes the temperature units from 3 Press the UP and DOWN ARROW KEYS to F to change from to 1 Enterthe service programming security code 4 Pressandhold the MENU KEY for five seconds See page 3 14 to return to normal operation 2 Press the MENU KEY to scroll to display units CHANGING TEMPERATURE UNITS Press menu key for 5 seconds to return to normal operation FIGURE 16 PROGRAMMING AND CALIBRATION PROGRAMMING ALARMS FOOD AND DRUG ADMINISTRATION FDA 3 ALARM The FDA alarm indicates the slot temperature is be low the FDA temperature setpoint 140 F for a time greater than the FDA time setting 4 1 Enterthe service programming security code See page 3 14 2 Press the MENU KEY to scroll to FDA PAGE FDA ALARM Press the ENTER key to advance the control Use the ARROW keys
10. off an active timer The timer stops tim ing The display changes tothe inactive status Timing out 1 The time out alarm alerts the operator that the product hold time has expired When the hold s SAUS time remaining reaches zero an audible alarm sounds and the display reads 00 NOTE The audible alarm is indicated by a modulating tone A continuous tone signals a warning alarm All other active displays in the cabinet switch to the lowest intensity level until the audible alarm is turned off Press the TIMER KEY to clear the timed out dis play and silence the alarm If other timers in the cabinet have timed out the audible alarm remains on until all timed out displays are cleared When all timers are cleared active timers re turn to normal status The Use First status is switched to the next timer with the least hold time remaining Bc _1 Press timer key to start a timer 4 Display alternately indicates hold time and product selection for active timers mI mali SL SAUS Ba rap E nz Press timer key to stop or silence a timer FIGURE 3 Use First indication changes to the next active timer MEAL SELECTION Selecting breakfast and lunch NOTE The following example is for selecting breakfast The same procedure applies for selecting lunch 1 Press the MENU KEY to change the product selection ofthe slot from breakfast to lunch All displays are highlighted 2 Press the
11. persists move on to next 00 Determine if the gray ribbon cable is good by swapping it with one from another shelf and running the test again If the Key Press Error goes away replace the rib bon cable If not move on to next Remove the display control from the bezel assy and inspect both ribbon connection areas for burns or corrosion If control looks bad you can prove it by swapping it out with one from another shelf If the Key Press Error goes away replace the dis play control If not replace the membrane After you hit the last key the shelf will go into an LED test at this time all led segments will light up If some of the segments do not light clean the connection between the gray ribbon cable and the display control and check the gray rib bon for cuts or burns If they still will not light replace the control During the LED test look at all 6 displays If the same led segment is out in all 6 displays the driver board is bad and should be replaced This page intentionally left blank 5 5 ELEMENT OR PROBE ASSEMBLY 1 Remove the right and left hand exterior panels by removing the two lower phillips head screws 2 Removethe top exterior panel by removing the two upper phillips head screws 3 Loosen the two hex head bolts located on ei ther side of the bezel assembly 4 Trace the ribbon cable from the bezel assem bly to it
12. phillips head screws Remove the ribbon and power connections from the affected driver board NOTE Markthe location of these connections to ensure they are replaced in their proper locations Release the four metal standoffs and remove the defective driver board Install the new board on the four metal stand offs Install the ribbon and power connections on the new board Install the side and top exterior panels of the unit Check the unit for proper operation TEMPERATURE PROBE Unplug the probe from the harness Connect an ohm meter to the probe Press the timer key to silence the alarm The slot heats up Place the pyrometer Refer to TABLE 1 on page 6 3 of the Technical Appendix for resistance values MOTHER BOARD The mother board is a static sensitive compo nent Make sure you use proper grounding pro cedures when handling this board 1 Remove the right and left hand exterior panels by removing the two lower phillips head screws 2 Remove the top exterior panel by removing the two upper phillips head screws 3 Remove all power sensor and communica tions connections from the board NOTE Mark the location of these connections to ensure they are replaced in their proper location 4 Release the six plastic standoffs to remove the board 5 Installthe new mother board Connectall ofthe power sensor and communications connec tions 6 Install the side and top exterior panels of the
13. setpoint temperature the control pulses the output of the elements This allows for an accurate set point response with minimum tem perature overrun NOTE The control also pulses output during nor mal operation to provide an even tempera ture response To Troubleshoot an Element 1 Verify offset calibration Refer to page 3 15 If correct continue with step 2 Attach an amp clamp to the input Observe the steady amp draw during the initial startup and the subsequent pulsing of this input at temper atures close to set point The main control applies voltage to the element as semblies by way of a TRIAC solid state device This circuit normally fails in the closed position and can result in an overheat condition If the elements do not receive the pulse input the main control is de HIGH LOW TEMPERATURE ALARM fective To replace a defective element the upper and lower portion of the shelf must be replaced whichever is defective Several warning alarms can result from a defective element e High and low temperature alarm FDA alarm Sensor alarm Rise time alarm If an alarm conditions occurs a display alarm ap pears An audible alarm may sound depending on the alarm condition Press the timer key to silence the audible alarm Timers cannot be started when a slot is in an alarm condition HI AND LOW TEMPERATURE ALARM Ifthe slot temperature is above or below the preset limits for a product selection the c
14. that all indi vidual shelf sections are within their pro grammed setpoints it maintains these temper atures with a continual pulsing of the input voltage to each shelf section independently NOTE Ifthe main control senses that a heater is not performing to its programmed specifications it can display a variety of failure conditions See page 4 1 of the Troubleshooting section OPERATION BLODGETT SINGLE PHASE 208 240 VAC 50 60HZ 9 1 nlo elo mio zlo ajo mlo wlo zlo ejo 31974 REV D FIGURE 10 This page intentionally left blank 3 PROGRAMMING AND CALIBRATION STORE MANAGER PROGRAMMING PRODUCT SELECTION FOR EACH SLOT Program mode is used to select the products for To enter Program Mode each slot All entries are made through PAGE and 1 Press and hold the MENU KEY for at least five MENU selections Each slot has a page of configu ration menus The top slot in the cabinet is Slot 1 seconds The display fonds RO MODE To enter Page Selections e The PAGE key selects the slot 1 4 pages The MENU key selects the configuration menu Each slot page 1 4 contains product selection for items meal and tray location each meal e The UP DOWN arrow keys select the available 1 Press the PAGE KEY to scroll to the slot 1 4 products for each meal pages SAUS Press and hold menu key to enter program mode ki P
15. to enter FDA time from 0 5 minutes The default is 2 minutes Pressthe ENTER key to advance the control Use the ARROW keys to enter FDA tempera ture from 55 140 The default is 140 F Press the ENTER key to advance the control Press and hold the MENU key to exit program ming Press Enter Page key to advance control FIGURE 17 HI AND LOW TEMPERATURE ALARMS the slot temperature is above or below the preset limits for a product selection the control enters the high or low alarm condition The alarm setpoints can be programmed from the ALRM PAGE They are entered as F offsets from the product setpoint The default settings are 10 F NOTE When switching menus or products the temperature alarm is displayed if the new product or menu requires a holding tem perature outside of the current alarm band If the condition remains for two or more minutes an audible alarm sounds Press any timer key to silence the alarm The dis play returns to normal when the new hold temperature has been reached 1 Enter the service programming security code See page 3 14 Press the MENU KEY to scroll to ALRM PAGE Press the ENTER KEY to advance the control The display reads ALRM ENBL ON NOTE Selecting ALRM ENBL OFF disables the visual and or audible product alarms for all slots HIGH AND LOW TEMPERATURE ALARM Drs Use the ARROW KEYS to toggle bewteen off and on Press the MENU KEY to advance the control
16. unit 7 Check the unit for proper operation BEZEL GASKET Remove the right and left hand exterior panels by removing the two lower phillips head screws Remove the top exterior panel by removing the two upper phillips head screws Loosen the two hex head bolts located on ei ther side of the bezel assembly Remove the bezel assembly Remove the two screws holding the LED as sembly to bezel Remove the membrane Switch ribbon cable from the LED board Remove the old gasket from the bezel assem bly Remove all of the old RTV from the bezel as sembly Place a small bead of RTV along the bottom edge andin the top corners ofthe bezel where the new gasket will be placed Gasket FIGURE 3 PARTS REPLACEMENT Install the new gasket in the bezel See FIGURE 3 for proper gasket placement Install the membrane switch ribbon cable in the LED board Attach the LED board to the bezel See FIGURE 2 on page 5 3 for proper placement and attachment of the membrane switch ribbon cable Install the bezel assembly on the frame by tightening the two hex head bolts located on either side of the bezel NOTE Be sure not to pinch the ribbon cable between the bezel and the shelf as sembly Install the side and top exterior panels of the unit Check the unit for proper operation Gasket CHIP REPLACEMENT The installation of the chips must be performed by a Blodgett Authorized Service and Part
17. up and down arrow keys to enter the manager security code 3 1 Press the page key to scroll to cook page Press the menu key to scroll to product selec tion Press the up and down arrow keys to increase or decrease the prompt time in minutes to cook more product When complete press and hold the menu key for 5 seconds to return to normal operation DEFAULT SELECTIONS FOR THE PROMPT TIME Description Available Access MEER iP o re p Poa soon tie roman 3 o ram 3 NOTE The right display gives the time in minutes PROGRAMMING AND CALIBRATION CHANGING THE DISPLAY TIME The rate at which an active timer alternately dis plays product selection and hold time may be ad justed as follows 1 Enter the manager programming security code See page 3 6 2 Press the MENU KEY to scroll to product dis play time PROD TIME 3 Press the UP and DOWN ARROW KEYS to change the product display time CHANGING THE DISPLAY TIME Press the MENU KEY to scroll to timer display time TIMR TIME Press the UP and DOWN ARROW KEYS to change the timer display time Press and hold the MENU KEY for five seconds to return to normal operation Press and hold the menu key to return to normal operation FIGURE 10 CHANGING THE DISPLAY INTENSITY The brightness of each of the three intensity levels 3 Press the UP and DOWN ARROW KEYS to used for product st
18. ACEMENT LED BOARD Remove the right and left hand exterior panels by removing the two lower phillips head screws Remove the top exterior panel by removing the two upper phillips head screws Loosen the two hex head bolts located on ei ther side of the bezel assembly Remove the bezel assembly Remove the two screws holding the LED as sembly to the bezel Remove the membrane Switch ribbon cable from the LED board Remove the ribbon cable clamps from the rib bon bundle on the right side of the unit Trace the LED ribbon cable to its driver board Remove the ribbon cable Feed the new LED board ribbon cable to its driver board Install the membrane switch ribbon cable to the LED board See FIGURE 2 on page 5 3 for proper placement and attachment of the membrane switch ribbon cable Install the LED board into the bezel Install the bezel assembly on the frame by tightening the two hex head bolts located on either side of the bezel NOTE Be sure not to pinch the ribbon cable between the bezel and the shelf as sembly Install the side and top exterior panels of the unit Check the unit for proper operation DRIVER BOARD The driver boards are static sensitive Make sure you use proper grounding procedures when handling these boards 1 Remove the right and left hand exterior panels by removing the two lower phillips head screws Remove the top exterior panel by removing the two upper
19. Before replacing the mother board check all the pins in the connec tor reinstall the harness to the board take a tooth pick snap it in half and insert each piece into the back of the probe wires Check the temp displays again to see ifthe TOP ACT coin cides with the actual temperature If so the problem was in the connection and the probe harness should be replaced If you still have HHHH the problem is in the mother board and it should be replaced A HHHH high resistance or open probe B LLLL low resistance or shorted probe Disconnect the probe from the harness on the side ofthe unit and read the resistance through the probe while verifying the actual plate tem perature If the resistance reading at the probe does not match the temperature according to the chart make sure you have a good connec tion with your meter If probe proves faulty re place the liner assembly The probe and ele ment are vulcanized to the liner and cannot be replaced separately If the plate temperature and probe resistance match according to the chart check and tight en connections at the side probe harness then read resistance at top of harness again If the resistance now coincides with the tempera ture the problem was in the connection If the resistance is still incorrect the problem is in the harness and should be replaced Ifthe problem is intermittent or you cannot find anything wrong test the probe Shutthe slot off and coolit
20. DISPLAYS show product selection and hold time for each tray position The displays also provide programming information in the pro gram mode There are three displays on each front panel left center and right MENU KEY press to select meal transitions breakfast to lunch clean mode operation and to turn individual slots on or off The menu key also provides access to the program mode TEMPERATURE ENTER PAGE KEY this key has three separate functions e Display slot temperature information e Enter operational changes e Select page parameters in program mode UP and DOWN ARROW KEYS press to in crease decrease variables or change selec tions REAR CONTROL PANEL NOTE The rear panels are used for operational functions only All programming must be from the front panels 1 TIMER KEYS start and stop the timer associ ated with each tray position The timer keys also turn off audible alarms There are three timer keys on each front panel left center and right 2 DISPLAYS show product selection and hold time for each tray position There are three dis plays on each front panel left center and right The operator mode is the normal operating mode of the controller when all slots are at the proper temperature and no alarm conditions exist Prod uct information and hold time are displayed SLOT TEMPERATURE CONTROL Each product selection has its own
21. ENTER KEY to activate selection The displays switch to the inactive mode NOTE If the enter key is not pressed within five seconds the product selection re turns to the breakfast meal selection OPERATION Changing meal selections Active slots with active timers will not change to the new meal selection until the timer s are stopped ortime out and are reset Active timers are stopped by pressing the timer key Ifthe product selection for the meal has a hold tem perature different than the current meal a high or low temperature alarm is displayed to alert the op erator that the hold temperature is being changed Should the high or low temperature condition re main for two or more minutes an audible alarm sounds See page 4 1 of the Troubleshooting section To silence the alarm press any timer key This does not affect the timer operation unless the timer key is pressed again The display alternately indicates the product selection and the alarm mes sage until the slot temperature is within the preset limits If no keys are pressed the alarm message auto matically resets when the slot temperature is within the preset limits SAUS Press menu key to display inactive meal selection tE Press enter key to enter meal selection and return to normal display mode FIGURE 4 CLEAN MODE The clean mode changes the temperature setpoint of all slots in the cabinet to 125 F 52 To st
22. Is there approx an 18V and Is there approx 18V and 9V board 9V on secondary on the main board Yes Replace the Successively plug in driver board no 4 3 2 amp 1 Veri main board the secondary voltage at each step If the secondary voltage is lost replace effected driver board is the heating problem No Is the resistance value of the probe correct No Replace the oncallshalves for the effected shelf see TABLE 1 on shelf assombl page 6 3 of the Technical Appendix y Yes Replace the Visually and electrically check RTD No Replace effected mother board and heater harness Are they ok harness Is there input voltage 208 240 Replace the applied to the effected element motherboard Yes Replace the effected shelf assembly Yes es FIGURE 5 TROUBLESHOOTING Problem An individual shelf display will not change from breakfast to lunch or will not allow the operator to set or reset the timers Is the problem on N Are connections N Glesnorreinstell all three display 9 from the control 2 membrane to the sections LED display Yes proper and in good condition Yes Replace control Problem still exists Problem still exists membrane switch Replace LED Replace assembly display assembly driver board Problem fixed Problem fixed bono Are ribbon cable connections Connect the ribbon from the display to the shelf cables to their driver connected to their ap appropriat
23. Product Information 3 6 More Product Prompt Time Feature 3 11 Changing the Display TiIMe a 3 12 Changing the Display Intensity 3 13 Service Programming and Calibration 3 14 To Access Service Programming 3 14 Offset Calibration iore bete I O EK REGE eet 3 15 Display Test Mode css toa SR a EI ee 3 15 Timer Fast lest si starsi En EEA RESOR ENA OSKR cde Erde re heats 3 15 Changing trom F 10 Lhe ed ME USE 3 19 Programming a A A Ga ea da ett 3 20 TROUBLESHOOTING Troubleshooting Elements and Warning Alarms 4 1 Troubleshooting Flow Diagrams 4 4 Troubleshooting a Locked Out Slot 4 10 Troubleshooting Sensor Alarms L a 4 11 Troubleshooting the Driver Board and Control 4 12 TABLE OF CONTENTS 5 PARTS REPLACEMENT Element or Probe ii epic ties Cooling Blower ce ec mech RU Re be D te E ees Bezel Assembly CE Pa weit PER aia KU I wis d
24. URE 8 Correct the wiring Problem Keypad Timer Enter Page or Menu keys not working Press problem key to Swap suspect display verify fault No cable to same position No Heplace membrane Replace utt switch on different driver ribbon cable Is audible click heard board Press problem key Is audible click Press problem key Is heard audible click heard No problem Replace driver board Problem fixed Problem Keypad Arrow keys not working Enter service level Swap faulty display cable Replace membrane programming to same position on dif See page 3 14 ferent driver board Switch Press problem key to Press problem key Press problem key Is au o verify fault dible click heard Is audible click heard Is audible click heard No problem Replace driver board Replace driver board FIGURE 9 Remove the rear ribbon cable from driver board If the front membrane starts to work you have now isolated the problem to one of three ofthe rear components If the front is still locked up then remove the front ribbon and try using the rear timers TROUBLESHOOTING TROUBLESHOOTING A LOCKED OUT SLOT Ifthey work then you have isolated the problem to one of three front components Before replacing the membrane switch Plug the new membrane into the display board and try it in your hand If it continues to lock up then the problem is in either the ribbon cab
25. art the clean mode 1 Press the MENU KEY to scroll to the clean mode message CLN MODE Press the ENTER KEY to activate the clean mode All slots change to clean mode NOTE If the enter key is not pressed within 5 seconds the control returns to the pre vious meal selection If the temperature is above 125 F 52 C the display alternately reads SLOT CLN MODE i Sl and NOT SAFE YET The display reads SAFE TO CLN when the slot is 125 F 52 To exit clean mode 1 2 Press the MENU KEY to display CLN MODE Press the ENTER KEY to exit the clean mode and return to normal operation The slot alter nately displays SLOT TEMP LOW and the prod uct selection until the temperature is within the normal operating limits NOTE If the enter key is not pressed within 5 seconds the slot returns to the clean mode SAUS Press menu key to scroll to clean mode message Press enter key to start clean mode nz i We 14 To exit clean mode press menu key to display clean mode message Press enter key to return to normal display mode tes FIGURE 5 SLOT ON OFF To turn slot off 1 2 Press the MENU KEY to scroll to the slot off message TURN SLOT OFF Press the ENTER KEY to enter the selection The display reads SLOT IS OFF NOTE If the enter key is not pressed within five seconds the product selection re turns to the operator mode OPERATION To turn slot on
26. atus may be adjusted as fol change the intensity level WS 4 Press and hold the MENU KEY for five seconds 1 Enter the manager programming security to return to normal operation code See page 3 6 2 Press the MENU KEY to scroll to display inten sity level The display reads DISP IntX There are three display intensity levels available 2 mid level 10 25 um zm TABLE 1 CHANGING THE DISPLAY TIME Drs Press and hold the menu key to return to normal operation S jesi JE FIGURE 11 PROGRAMMING AND CALIBRATION SERVICE PROGRAMMING AND CALIBRATION THE FOLLOWING PROGRAMMING AND CAL 1 IBRATION INFORMATION IS FOR AUTHORIZED SERVICE PERSONNEL ONLY TO ACCESS SERVICE PROGRAMMING 3 Service programming is password protected Use the following procedure to enter the password and 4 access service programming level 3 program ming ENTERING THE PASSWORD Press and hold the MENU KEY for five sec onds Press the ENTER PAGE KEY to scroll to VIEW PAGE Press the MENU KEY to scroll to the security lock SCR LOCK Press the UP and DOWN ARROW KEYS to en ter the security code 247 or 331 Press ENTER PAGE KEY Dr Press and hold menu key to enter program mode S JE FIGURE 12 Press menu key to scroll to the security lock Use 331 or 247 UHC OFFSET CALIBRATION The offset value is the difference between the set point and the actual temperature Ifthe actual tem
27. ced towards the center of the tray FIGURE 9 Production control charts Laminated charts can be ordered through O Brien Budd Inc The ordering numbers are Breakfast card MCD 63102 Regular Menu UHC card MDC 63102A SEQUENCE OF OPERATION COMPONENT REFERENCE NOTE Referto FIGURE 10 page 2 10 for compo Q0 ND Ro eor ons nent locations METAL OXIDE VARISTOR DPST POWER SWITCH TANGENTIAL BLOWER TRANSFORMER 200 240V HEATER TRIAC HEATER ELEMENTS SHELF PROBES SHELF 1 DRIVER BOARD SHELF 2 DRIVER BOARD SHELF 3 DRIVER BOARD SHELF 4 DRIVER BOARD SHELF 1 FRONT DISPLAY ASSY SHELF 2 FRONT DISPLAY ASSY SHELF 3 FRONT DISPLAY ASSY SHELF 4 FRONT DISPLAY ASSY SHELF 1 REAR DISPLAY ASSY SHELF 2 REAR DISPLAY ASSY SHELF 3 REAR DISPLAY ASSY SHELF 4 REAR DISPLAY ASSY SHELF 1 FRONT MEMBRANE SHELF 2 FRONT MEMBRANE SHELF 3 FRONT MEMBRANE SHELF 4 FRONT MEMBRANE SHELF 1 REAR MEMBRANE SHELF 2 REAR MEMBRANE SHELF 3 REAR MEMBRANE SHELF 4 REAR MEMBRANE CN 1 CONNECTOR CN 2 CONNECTOR OPERATION 1 Apply power to the unit The input voltage is applied to the DPST POWER SWITCH 2 the TANGENTIAL BLOWER 3 and the primary side of the 200 240V TRANSFORMER 4 The input power is also applied to pins 2 5 8 and 11 of CN 7 on the mother board and to one side of each HEATER ELEMENT 6 on WH 11 18VAC is applied to the mother board through the secondary si
28. de of the TRANSFORMER 4 between OR 20 and Y 20 9VAC is applied to the mother board from the secondary of the TRANSFORMER 4 between BL 20 and OR 20 and between BL 20 and Y 20 The moth er board applies 18VAC to each shelf driver board through the wire bundle at CN 1 28 while continuously exchanging operational logic signals with each shelf driver board through the wire bundle attached to CN 2 29 After the individual SHELF DRIVERS 8 11 receive power and communications from the mother board they send power and logic sig nals to its FRONT and REAR DISPLAY AS SEMBLIES 12 19 and their respective MEM BRANE SWITCH DISPLAY DECALS 20 27 The main control board uses the inputs from the eight individual RTD PROBES 7 to deter mine if any of the eight HEATERS 6 need to be energized to bring their respective shelf sections to the proper temperature NOTE The eight probes react independently and sense temperature by resistance Refer to the table on page 6 3 of the Technical Appendix If the main control decides that an individual shelf section is not at the correct temperature it energizes the proper TRIAC 5 and sends power through CN 7 to the respective heater NOTE Ifthe main control senses that the tem perature of an individual shelf section is much lower than the setpoint it will pulse the voltage to the heater to main tain a consistent temperature with a minimum overrun When the main control determines
29. e driver propriate driver board board Replace LED Problem still exists display assy Replace the driver board Yes Problem fixed FIGURE 6 Problem An individual shelf is in an overheat or underheat situation Is the resistance vs temperature on the probe correct Refer to page 5 5 for procedure see TABLE 1 on page 6 3 of the Technical Appendix for conversions Does the input voltage to the element cycle on and off and pulse when close to set point Replace shelf assembly Replace shelf assembly Is the programming correct for this shelf see Programming and Calibration section Replace the main board FIGURE 7 Correct the programming see Programming and Calibration section Problem Unit displays sensor alarm Is the resistance vs temperature on the probe correct Refer to page 5 5 for procedure see TABLE 1 on page 6 3 of the Technical Appendix for conversions Does the resistance of the probe and harness approx match TABLE 1 on page 6 3 of the Technical Appendix Replace the mother board Problem Unit displays FDA or rise time alarm Is the effected element receiving 208 or 240 input voltage Bad probe or heater Replace the shelf assembly TROUBLESHOOTING Replace the shelf assembly Replace the RTD harness Is the wiring harness between the element and mother board correct Replace the mother board FIG
30. ed products meat eggs chicken This tray main tains the product s moisture Knockouts for Double Stacking Power Switch Product Slot Control Panel 1 2 Size Crumb Tray with Wire Rack designed for fried products crispy chicken nuggets fillet The tray keeps the fried crumbs from dropping through the racks It also allows moisture to es cape leaving the outside of the product crispy Full Size Product Tray designed for bread prod ucts biscuits and muffins This tray allows a small amount of moisture to escape Each Universal Holding Cabinet is shipped with the following e Equipment manual e e Training video e Quick reference guide e Cleaning brush FIGURE 1 SPECIFICATIONS OVEN CLEARANCES The following clearances must be available for ser vicing Cabinet body sides 22 56 cm Cabinet body back 25 64 cm ELECTRICAL SPECIFICATIONS Electrical Specifications per section Kw Hz Volts Phase Amps U S and Canadian installations 208 240 General Export installations Eas TABLE 1 Installation must conform with local codes or in the absence of local codes with the National Electrical Code ANSI NFPA 70 Latest Edition and or Cana dian Electrical Code CSA C22 2 as applicable Wiring diagrams are located inside the right side panel This appliance is equipped with a three prong grounding plug for your protecti
31. emp page NE Press menu key to to product top plate temperature selection u Press menu key to scroll to product bottom plate temperature selection Hz L Press up down arrow key to change bottom plate temperature os FIGURE 8 PROGRAMMING AND CALIBRATION ENTERING MEAL USAGE L Press page key to scroll to the meal page Hs Press menu key to scroll to product meal selection ie Press up down arrow keys to select BFST nE FIGURE 9 UHC MORE PRODUCT PROMPT TIME FEATURE Acook more time may be entered for each product type that will alert the operator to cook more prod uct before the holding time reaches zero When the product timer equals the cook time the audible alarm will chirp for 3 seconds and the display mes sage will alternately display PRODUCT NAME TIM ER TIME COOK and MORE until the timer times out If more than one tray of a product type is active the cook more alarm will not occur until all active timers reach the cook time If a position is indicat ing COOK MORE and another timer of the same product is started the COOK MORE message will be cleared During transition from breakfast to lunch the COOK MORE indication is disabled Use the following procedure to change or enter the cook time of a product svelection Press and hold the menu key for 5 seconds Press the page key to scroll to view page Press the menu key to scroll to the security lock Press the
32. ith the IC3 socket correctly One corner of the chip has a 45 angle One corner of the socket has a 45 angle and an arrow The 45 angle on the chip must line up with the 45 angle and the arrow on the socket See NO TAG Push gently with your finger until the new chip is completely inserted into the socket Repeat steps 5 and 6 for the ICA chip Replace the top panel on the unit Run the unit through the functional test OPERATION VERIFICATION 1 Powerup the UHC Let the unit warm up to the set temperature NOTE As soon the LED display lights up the display should read BOC VER 2 00 2 Product Timer a Press the product key to initiate the prod uct program b Press the product key again within 3 sec onds to verify that the displayed holding time decreases by 5 seconds c Repeat for each product program PARTS REPLACEMENT 4 Socket IC3 IC4 Chip FIGURE 4 This page intentionally left blank 6 TECHNICAL APPENDIX SCHEMATIC BLODGETT SINGLE PHASE 208 240 VAC 50 60HZ 9 1 alo elo mjo o njo njo mio wlo zo elo Dio ojo 31974 REV D FIGURE 1 TECHNICAL APPENDIX WIRING DIAGRAM ac rs HER 1 Im np E2790 DRIVER BOARD LOCATED ON BOTTOM COLOR CODE BLODGETT 208 240 VAC 50 60HZ SINGLE PHASE FIGURE 2 TEMPERATURE PROBE 61 16 C 87 90 93 97 TABLE 1
33. le or the display board TROUBLESHOOTING SENSOR ALARMS The following is a test procedure to be used on the UHC 1 cabinet to determine the cause for many of sensor alarms we are experiencing You will need the probe resistance chart found on page 6 3 to perform the following tests 1 Determine the slot experiencing the SENSOR ALARM 2 Determine the plate causing the alarm do this you need to press the ENTER key 4 times in succession and read the displays A Push ENTER key once display reads TOP ACT HHHH B Push ENTER key again display reads BO T ACT 200 C Push ENTER key again display reads TOP SET 200 D Push ENTER key again display reads BOT SET 200 This has now determined that the SENSOR ALARM is being caused by a high probe sistance reading This example is indicative of a potential probe problem on the top plate of the slot experiencing the alarm 3 Using a Pyrometer get the actual temp of the plate in question This is the temp you will be referencing 4 Remove the probe harness from the mother board and get the resistance reading from the correct probe leads reference the schematic on page 6 1 The resistance value and tem perature should match according to the chart If the resistance reading did not coincide proceed to STEP 5 If the resistance coincides with the actual temp the problemis either in the harness connection or the mother board
34. mportant to the proper operation of the UHC There are no doors in the cabinet The trays act as doors there fore it is important that they be positioned correctly The trays must be inserted to the stop line The stop line is clearly marked on the handle ofall three tray styles Product Slots The UHC has four slots that can hold up to three trays of product per slot FIGURE 8 Fried Products The 1 2 crumb tray with the wire rack is designed to hold all fried products Product should be held in the wire rack which is placed in the crumb tray tray liners are not necessary when using the wire rack for fried product OPERATION Baked Products The full size tray is designed to hold all baked prod ucts such as biscuits and muffins Use a UHC tray liner with the full size tray After biscuits have been removed from the bis cuit oven remove the wrapper and open the cardboard box Slide the biscuits onto the tray liner Full size trays can hold up to 30 frozen biscuits 20 scratch biscuits or 20 muffins Grilled Products The 1 3 tray is designed to hold all grilled products Product should not be drained when picked up from the grill Use a UHC tray liner with the 1 3 tray Product should be stacked when placed in the lined 1 3 size tray 10 1 and sausage patties can be stacked up to six high Eggs except scrambled grilled chicken and 4 1 patties can be stacked up to three high Product should be pla
35. of the shelf as sembly so that both the top and bottom shelf sections are flush Install the foil wrapped shelf insulation and in sulation cover assembly Insert the shelf assembly into the unit frame Install the four phillips head screws through the shelf assembly into the unit frame Connect the two probe and element wire con nections at the right side of the shelf assembly Feed the ribbon cables from the bezel assem blies over the top ofthe shelves to their associ ated driver boards NOTE Be careful not to pinch the ribbon cable between the bezel and the shelf assembly Inspect the gasket assembly on the bezel Re place if necessary See Bezel Gasket Replace ment on page 5 6 Install the front and rear bezel assemblies Tighten the four hex head bolts on either side of the bezel assemblies Install the ribbon cable clamps on the ribbon cable bundle located on the right side of the unit Install the side and top panels Check the unit for proper operation PARTS REPLACEMENT COOLING BLOWER 10 11 Remove the right and left hand exterior panels by removing the two lower phillips head screws Remove the top exterior panel by removing the two upper phillips head screws Remove the black and white power connec tions from the blower motor Loosen the two phillips head screws holding the blower bracket to the unit frame Remove the blower and bracket from the unit Remove the
36. ois Membrane Switch err LED Board eue hte Dp ELI rye lc MILES da ital ee Driver Board ENA RN LEE CELE Ue LENA oid Ede Temperature Prob iiie tek take ee ill Le A Mother Board 2e IPSI de ai id ieee ed BD E HOP IEEE Bezel Gasket yk hides antes eque a d tfe RU ets Chip Replacement gross re read Patek etree pains Pantene TaN rata Va ates 6 TECHNICAL APPENDIX SCHEMAUNC cape gens Cal abt kato je i teh aye of Tals vane DeC ns Wiring Dagta e e exu e adu a Rigen Temperature Probe s s srat ine aie ane RE gia ed Gis AL a ea a bot d d d P gd NO anf AON O1 O1 0 OC 0 OI CO wo Oo On 1 INTRODUCTION DESCRIPTION The Blodgett Universal Holding Cabinet is a short term holding device designed to maintain the freshness of a variety of food product The UHC contains four product slots which can be con trolled independently Control panels are located above each slot on both the front and rear of the cabinet All operator mode selections can be made from either the front or rear display Power Switch controls power to the cabinet Product Slot holds up to three trays of product per slot Control Panel indicates the holding time and product selection for each tray position 1 3 Size Product Tray designed for all grill
37. on against shock hazard and must be plugged into a properly grounded three prong receptacle DO NOT cut or remove the grounding prong from this plug INTRODUCTION CONTROL SPECIFICATIONS 208 VAC 10 15 or 240 10 15 50 60 Hz Input Voltage 264 VAC maximum 177 VAC minimum Load Requirements 400 watt maximum at heaters 240 resistive load 8 heaters per cabinet max Operating Voltage System Operating Environment 50 104 F 10 40 with 400 ft minute airflow over circuit board assemblies Required Handling contain sensitive Precautions electronic components DO NOT ship or store near strong electrostatic electromagnetic magnet ic or radioactive field CAUTION Due to elec trostatically sensitive components All techni cians performing service work must be grounded Grounding may be ac complished using grounding strap or other suitable means Connect to another grounded un powered piece of equip ment ie equipment oth er than the one you are currently working on TABLE 2 This page intentionally left blank CHAPTER 2 OPERATION CONTROL PANEL DESCRIPTIONS UHC Rear Control Panel FIGURE 1 FRONT CONTROL PANEL 1 TIMER KEYS start and stop the timer associ ated with each tray position The timer keys also turn off audible alarms There are three timer keys on each front panel left center and right
38. ontroller enters the high or low alarm condition The display reads either SLOT TEMP HIGH or SLOT TEMP LOW 1 Anaudible alarm sounds ifthe alarm condition remains for two or more minutes NOTE Thelow temperature audible alarm is inhib ited at power up The SLOT TEMP LOW message is displayed alternately with the product selection until the slot is within the preset limits Press any timer key to silence audible alarm FIGURE 1 FOOD AND DRUG ADMINISTRATION FDA ALARM The FDA alarm indicates the slottemperature is be low the preset limit to hold the product The audible alarm sounds and the display reads TEMP UNDR FDA Active timers are automatically reset 1 Toturn off the audible alarm press any TIMER KEY The alarm message remains until the slot temperature is within the preset limits If no keys are pressed the audible and visual alarm remain See page 4 8 for troubleshooting FDA ALARM TROUBLESHOOTING SENSOR RANGE ALARM The sensor fail alarm indicates a sensor tempera ture value above or below the operating limits of the slot 50 250 F 10 121 C 1 Toturn off the audible alarm press any TIMER KEY The alarm message is displayed until the slot temperature is within the operating limits Press the temp enter key to display the error message HHHH or LLLL HHHH indicates high resistance high temperature or open shorted probe LLLL indicates low resistance low tem perature or open sho
39. ower on primary transformer Ye S Is there voltage on the Replace transformer secondary transformer Leave secondary wiring disconnected Yes Verify voltage on secondary transformer Isolate any shorts between transformer leads NEPCA MAn poar Replace effected components Replace power switch Problem Segment out in display Enter the display test mode See page 3 15 Verify faulty segment _ location Swap front and Replace the driver board rear display driver cables Is the segment still out Visually and electrically check the suspect display cable Replace the display cable Is the cable ok Replace the display FIGURE 4 Problem Unit does not heat Is the unit plugged in Yes No Is the power switch on Yes S JE Check power switch for failure Is there an illuminated No Is 208 or 240V applied to the No and wires from power switch to display on each shelf primary of the transformer primary of transformer for Yes Yes continuity Replace if necessary Disconnect OR 20 BL 20 8 Y 20 from the main board Is there approx 18V output from the secondary of the No Replace the transformer between OR 20 8 Y 20 transformer Is there approx 9V output from the secondary of the transformer between BL 20 8 OR 20 and BL 20 8 Y 20 OR 20 BL 20 8 Disconnect CN 1 AC power Y 20 to the main board in to each driver board No Replace the
40. rature setting are password pro tected functions To enter the password 1 Press and hold the MENU KEY for five sec onds The display reads PROG MODE 2 Press the ENTER PAGE KEY to scroll to VIEW PAGE 3 Press the MENU KEY to select the security lock SECR LOCK 4 Pressthe UP and DOWN ARROW KEYS to en ter the security code 123 ENTERING THE PASSWORD SAUS 5 Press ENTER PAGE A new product entry requires entry of e the product name e hold time e hold temperature from 55 250 F 13 121 C e meal selection The following example enters a new product named XXY with a hold time of 25 minutes and hold temperature of 180 F 82 C Press and hold menu key to enter program mode alge SL Press menu key to to the security lock FIGURE 5 ENTERING THE PRODUCT NAME L Press page key to scroll to the edit page Press menu key to scroll to an unused product blank mnenonic Press up arrow key to NOTE The decimal point indicates which dig scroll to the letter X play segment is being entered FIGURE 6 PROGRAMMING AND CALIBRATION ENTERING THE PRODUCT HOLD TIME be L Press page key to scroll to the time page u Press menu key to scroll to product time selection uz L Press up down arrow key to change time to 25 minutes FIGURE 7 ENTERING THE PRODUCT HOLD TEMPERATURE Press page key to scroll to the t
41. ress page key to scroll slot page selections Press page key to scroll slot page selections Press page key to scroll slot page selections FIGURE 1 PROGRAMMING AND CALIBRATION Meal Selection and Tray Position 1 Press the MENU KEY to scroll the meal and tray position in the left and center displays The current product selection is indicated in the right display Press menu to key to scroll meal selection and tray position Press menu to key to scroll meal selection and tray position Press menu to key to scroll meal selection and tray position Press menu to key to scroll Meal Selection meal selection and tray position FIGURE 2 To enter Product Selection 1 Press the UP DOWN ARROW KEYS to scroll the available product selections for each meal and tray position The product selection for the left tray position of each meal determines the hold temperature for the slot Only products that have hold temperatures within 5 F 2 8 C ofthe left most product selection will be displayed for selection in the center and right tray position Ifthe left most product selection PRODUCT SELECTION is changed the center and right positions must be reentered If the product selection for an active tim er is changed the timer is automatically reset To exit Program Mode 1 Press and hold the MENU KEY for five se conds NOTE The controller automatically exits the program mode if no entries are made
42. rted probe Measure the resistance of the probe see page 5 5 Scroll through the menu key until TURN SLOT OFF is displayed Press the enter key within five seconds Service is required to correct a sensor alarm Refer to the flow diagrams in this chapter for troubleshooting Press any timer key to silence audible alarm FIGURE 2 RISE TIME ALARM The rise time alarm indicates that the slot tempera ture failed to reach operating temperature within the preset time limits of the system at power up The system measures the time that each plate takes to go from 100 125 F If this time is greater than 15 minutes the alarm is activated and SLOT RISE RATE is displayed 1 To turn off the audible alarm press any TIMER KEY Service is required to correct a rise time alarm See page 4 8 for troubleshooting RISE TIME ALARM Press any timer key to silence audible alarm SLOT g Use the following procedure to view the rise times for each plate 1 Press and hold the MENU key to enter the pro gram mode Press the PAGE key to scroll to the TEST PAGE Press the MENU key to scrollthe time recorded for each slot at start up Press any menu key to scroll the recorded rise times FIGURE 3 TROUBLESHOOTING TROUBLESHOOTING FLOW DIAGRAMS Problem Unit fails to power up Verify input power Check to terminal block branch circuit Yes Turn on power switch Verify blower operation and p
43. s ASAP agency Failure to follow this mandate will result in the nullification of your warranty Read all instructions for understanding prior to chip installation This service kit installs two IC chips which change the functions on your UHC allow adjustment of product hold times replace the cook function with a COOK MORE product prompt feature Check that all of the following parts were received 35098 IC3 IC4 Chips and Puller 35111 ESD Wrist Strap 33355 THE MOTHER BOARD IS A STATIC SENSITIVE COMPONENT MAKE SURE YOU USE PROPER GROUNDING PROCEDURES BEFORE BEGIN NING THIS PROCEDURE 1 Disconnect power to the unit 2 Ground yourself using the ESD wrist strap pro vided 3 Remove the two screws securing the top panel of the unit 4 Remove the top panel 5 Usethe chip removal tool provided to remove the chip labeled IC3 Integrated Circuit 3 as follows d Insert the chip removal tool into one ofthe square corners of the chip socket Slowly pull the chip upward NOTE Besurethatthe chip you are remov ing is labeled 1 Move the chip removal tool to another cor ner of the chip socket Slowly pull the chip upward Alternate corners until the chip is com pletely removed from the chip socket Install the new IC3 chip as follows a chip labeled IC3 from its pack aging NOTE Be sure that the chip you are instal ling is labeled IC3 Be sure to line the new IC3 chip up w
44. s associated driver board Remove the ribbon cable from the driver board NOTE Markthe location of the ribbon cable to ensure it is replaced in the proper loca tion 5 Remove the ribbon cable clamps from the rib bon cable bundle on the right side of the unit 6 Repeat steps 3 5 for the adjacent bezel as sembly 7 Remove both bezel assemblies to allow for un obstructed access to the shelf assembly 8 Disconnect the two probes and element wire connections from the affected shelf assembly Remove the four phillips head screws that at tach the shelf assembly to the frame Remove the shelf assembly from the frame by sliding it out from either side NOTE If you are removing the 1 shelf as sembly you must also remove the two wire clamps attached to the right side of the shelf assembly before removing the shelf from the frame Remove the insulation cover from the shelf as sembly by removing the two phillips head Screws on either side of the cover assembly Remove the four pieces of insulation from the shelf assembly NOTE The foil wrapped insulation is VERY FRAGILE Please use extra care when handling Remove the twelve phillips head screws from the top shelf section See FIGURE 1 Disassembling the Shelf Assembly FIGURE 1 14 15 20 21 22 23 24 Discard the defective shelf section Install the new shelf section Be sure to align both the front and rear faces
45. te and stay lit to give the operator time to check both sides of the UHC After the dis plays have been checked turn the unit off and back on again to exit the display test mode 4 After verifying all slot display segments illumi nate press the ARROW KEY to stop the test The display reads DISPLAY TEST OFF 5 Press the MENU key for five seconds to exit service programming NOTE Itis not necessary to exit the program ming mode if you wish to advance to the Timer Test TIMER FAST TEST This test changes the timing on the TIMER KEYS from minutes to seconds to allow for quick test of the timer keys Access service level programming to execute the timer test 1 Press the ENTER PAGE key to scroll to TEST PAGE 2 Press the MENU KEY to scroll to FAST TEST OFF 3 Pressthe ARROW KEY to toggle to FAST TEST ON 4 Itis necessary to exit the service programming level to test the timer keys Press the MENU KEY for five seconds to exit service program ming and test the timer keys 5 Pressany TIMER KEY to activate and verify the timer count down while in seconds mode The timer counts down and an alarm sounds To si lence the alarm press the TIMER KEY 6 To cancel TIMER FAST TEST re enter the ser vice level programming See page 3 14 7 Press the ENTER PAGE key to scroll to TEST PAGE 8 Press the MENU KEY to scroll to FAST TEST ON 9 Press the MENU KEY to toggle to FAST TEST OFF 10 Press the MENU KEY
46. temperature setpoint and product hold time All product timers run independently The slot temperature is controlled by the tempera ture setpoint of the left most product entry in each slot as viewed from the front of the cabinet side with the On Off switch Product selections that have a hold temperature different than the left most j SAUS Use first timer highest intensity Si 12 Running dots decimal points S SAUS Active timer medium intensity OPERATION product selection will not be available for entry into that slot s configuration DISPLAY INFORMATION In the operator mode the slot displays provide the following information e The product selection for each tray location The hold time remaining in minutes for active timers NOTE An active timer alternately displays the product selection and the time remaining Inactive timers display only product selec tion SAUS GS Inactive timer lowest intensity SAUS FIGURE 2 TIMER OPERATION NOTE If more than one tray of product is timing the tray with the least hold time remaining is indicated by the Use First display Starting a timer 1 Press the TIMER KEY above the desired tray position to start the timer The timer counts down from a preset value and alternately dis plays product selection and the hold time re maining Stopping a timer 1 Press the TIMER KEY above the slot position to turn

Service Manual - Whaley Food Service

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