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Dacor PMOR3021B, Service Manual

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Dacor PMOR3021B Service Manual Download Page 41

39

PMOR3021S
PMOR3021B
PMOR3021R

6

4

5

1

2

3

6

4

5

1

2

3

A

B

C

D

E

F

G

H

A

B

C

D

E

F

G

H

Figure S-1. Pictorial Diagram

HIGH VOLTAGE COMPONENTS

CONTROL UNIT

Power Supply

cord 120V 60Hz

1

2

3

WHT

GRN

BLK

WHT

BLU

GRN

BLK

OVEN THERMAL CUT-OUT

FUSE AND HOLDER

FAN MOTOR

OVEN LAMP

AND SOCKET

to oven cavity top plate

BLK

BLK

RED

BLK

GRY

BLU

BRN

BRN

GRN

BRN

WHT

WHT

BLU

BLU

BLU

ORG

GRN

PPL

WHT

WHT

BRN

BLU

SECONDARY

INTERLOCK

SWITCH

N.O.

N.C.

COM.

COM.

MONITOR

SWITCH

ORG

BRN

ORG

N.O.

N.O.

COM.

COM.

RED

RED

RED

AC3

RED

RED

BLU

RED

ORG

BLK

BLK

PRIMATY

INTERLOCK SWITCH

STOP SWITCH

SENSOR GROUND WIRE

ORG

HOOD FAN MOTOR

STIRRER MOTOR

STIRRER MOTOR

1

2

3

4

5

6

WHT

RED

YLW

BLU

BLK

WHT

RED

YLW

BLU

BLU

BLK

2

1

3

4

BRN

WHT

RED

RED

ORG

ORG

RED

WHT

1

3

2

YLW

PPL

5

4

3

2

1

ORG

BLK

CN-C

CN-H

CN-B

RY3

N.O.

T1.

CN-E

CN-H

CN-G

CN-E

1

1

1

3

1

3

2

13

HOOD FAN

THERMAL

CUT-OUT

HOOD LAMP

AND SOCKETS

To GND

GRN

GRN

WHT

ORG

9

8

7

6

5

4

3

ORG

YLW

RED

PPL

2

1

RED

CN-A

MAGNETRON

INVERTER UNIT

Base plate R plate

FA

FA

F

F

1

3

2

YLW

PPL

CN-A

CN-A

3

1

2

WHT

YLW

CN-B

2

1

1

1

3

3

GRN

BLK

BLK

HUMIDITY SENSOR 

RED

WHT

1

2

3

CN-F

CN-C

1

5

CN-A

1

9

CN-F

RY-1

RY4

RY5

RY6

RED

RED

YLW

M

RED

GRY

BLK

WHT

NOISE FILTER

BOARD

N

H

BLU

WHT

GRY

GRY

WHT

WHT

Summary of Contents for PMOR3021B

Page 1: ...ORMATION 5 OPERATION 7 TROUBLESHOOTING GUIDE 11 TEST PROCEDURE 13 TOUCH CONTROL PANEL ASSEMBLY 23 COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE 30 PICTORIAL DIAGRAM 39 POWER UNIT CIRCUIT 40 LSI UNIT CIRCUIT 41 PRINTED WIRING BOARD 42 PARTS LIST 43 PACKING AND ACCESSORIES 48 In the interest of user safety the oven should be restored to its original condition and only parts identical to those speci...

Page 2: ...ive unit perform a microwave emission check as per the Microwave Measurement Procedure outlined in this service manual If microwave emissions level is in excess of the specified limit contact DACOR immediately 1 800 793 0093 If the unit operates with the door open service person should 1 tell the user not to operate the oven and 2 contact DACOR and Food and Drug Administration s Center for Devices...

Page 3: ... Todischargehighvoltagecapacitor waitfor60seconds 4 Disconnect the leads to the primary of the inverter unit 5 Ensure that these leads remain isolated from other components and oven chassis by using insulation tape 6 After that procedure reconnect the power supply cord When the testing is completed 1 Disconnect the power supply cord and then remove outer case 2 Open the door and block it open 3 To...

Page 4: ...astic The placing of this standard load in the oven is important not only to protect the oven but also to insure that any leakage is measured accurately 4 Set the cooking control on Full Power Cooking Mode 5 Close the door and select a cook cycle of several minutes If the water begins to boil before the survey is completed replace it with 275 ml of cool water C Leakage test Closed door leakage tes...

Page 5: ...he oven Servicing and repair work must be carried out only by trained service personnel DANGER Certain initial parts are intentionally not grounded and present a risk of electrical shock only during servicing Service personnel Do not contact the following parts while the appliance is energized Inverter unit that includes High Voltage Capacitor High Voltage Power Transformer High Voltage Rectifier ...

Page 6: ...ughout the cooking time P 90 approx 90 of Full Power P 80 approx 80 of Full Power P 70 approx 70 of Full Power P 60 approx 60 of Full Power P 50 approx 50 of Full Power P 40 approx 40 of Full Power P 30 approx 30 of Full Power P 20 approx 20 of Full Power P 10 approx 10 of Full Power P 0 No power throughout the cooking time SENSOR CENTER pads MEAL TIME pads HELP GUIDE pad KEEP WARM PLUS pad EASY D...

Page 7: ... prong grounding plug DO NOT UNDER ANY CIRCUMSTANCES CUT OR REMOVE THE GROUNDING PIN FROM THE PLUG The power supply cord and plug must be connected to a separate 120 Volt AC 60 Hz 15 Amp or more dedicated line using agroundedreceptacle ThereceptacleshouldbelocatedinsidethecabinetdirectlyabovetheMicrowaveOven Hoodsystem mounting location OVEN DIAGRAM 1 Oven door with see through window 2 Door hinge...

Page 8: ...OTE Some one touch cooking features such as MINUTE PLUS are disabled after three minutes when the oven is not in use These features are automatically enabled when the door is opened and closed or the STOP CLEAR pad is pressed PMOR3021S ...

Page 9: ...hen the door was opened 7 Themonitorswitchiselectricallymonitoringtheoperation of the secondary interlock switch and primary interlock switch and is mechanically associated with the door so that it will function in the following sequence 1 When the door opens from a closed position the primary interlock switch and secondary interlock switch open their contacts and then the monitor switch contacts ...

Page 10: ...Y 2 is energized The power transformer is turned on microwave energy is produced and first stage is started The 32 seconds is the cooling time required to remove any vapor from the oven cavity and sensor NOTE During this first stage do not open the door or touch STOP CLEAR pad 4 When the sensor detects the vapor emitted from the food the display switches over to the remaining cooking time and the ...

Page 11: ... H1 H3 NOTES 1 Circuits Wire Colors subject to change without notice 2 Terminal that located to the right side on the lamp socket s back view must be connected to neutral wire 3 Only certain models use the absolute humidity sensor H N GND GRN LVT C1 C2 C4 C3 WHT BLU RED BLK BLU WHT RED BLK RED RED FUSE 20A RED ORG RED RED A5 RY3 A7 High BLK BLK WHT HOOD CAPACITOR HOOD MOTOR GRY YLW BLU YLW RED RY4...

Page 12: ...guide HOOD LAMP The hood lamps are mounted at the hood lamp angle The hood lamps can be turned off and on by touching the Light Options pad And also the brightness can be varied to high or low by touching the Light Options pad DOOR OPEN MECHANISM The door is opened by pushing the open button on the control panel refer to the Figure D 1 Whentheopenbuttonispushed theopenbuttonpushesup the open lever...

Page 13: ...MPORTANT Whenever troubleshooting is performed with the power supply cord disconnected It may in some cases be necessary to connect the power supply cord after the outer case has been removed in this event 1 Disconnect the power supply cord and then remove outer case 2 Open the door and block it open 3 To discharge high voltage capacitor waite for 60 seconds 4 Disconnect the leads to the primary o...

Page 14: ...n cook cycle But it does light when door is opened Fan motor does not operate Oven lamp and strrer motor operate Oven does not go into cook cycle when START pad is touched Oven seems to be operating but little or no heat is produced in oven load Food incompletely cooked or not cooked at all at end of cook cycle Oven goes into a cook cycle but extremely uneven heating is produced in oven load food ...

Page 15: ...ometerorthermocouplethroughthewater until the temperature stabilizes Record the temperature of the water 2 Place the cup of water in the oven Operate oven at POWER 10 HIGH selecting more than 60 seconds cook time Allow the water to heat for 60 seconds measuring with a stop watch second hand of a watch or the digital read out countdown 3 Remove the cup from the oven and again measure the temperatur...

Page 16: ...ower output cooking Magnetron is defective Exchange the magnetron Exchange the Inverter unit Brown monitor fuse The secondary interlock switch primary interlock switch and the monitor switch are operating properly YES Exchange the Inverter unit TEST PROCEDURES PROCEDURE LETTER COMPONENT TEST NO Check the switches according to the switch Test Procedure YES NO 1 Disconnect the power supply cord and ...

Page 17: ...ushed in the meter should indicate an open circuit If improper operation is indicated the switch may be defective After testing the monitor switch reconnect the wire lead to the monitor switch COM terminal and check the continuity of the monitor circuit 5 Reconnect all leads removed from components during testing 6 Reinstall the outer case cabinet 7 Reconnect the power supply cord after the outer ...

Page 18: ... all leads removed from components during testing 6 Reinstall the outer case cabinet 7 Reconnect the power supply cord after the outer case is installed 8 Run the oven and check all functions Resistance between BLU 1 AND YLW 4 0 Ω Shorted BLK 2 AND YLW 4 32 Ω BLU 1 AND BLK 2 32 Ω BLK 2 AND WHT 3 10 Ω WHT 3 AND RED 5 20 Ω 32 Ω 10 Ω 20 Ω HOOD FAN CAPACITOR YLW RED BLU BLK 1 2 3 WHT 4 5 1 2 3 4 5 BLU...

Page 19: ...certain digit all or some segments do not light up b At a certain digit brightness is low c Only one indicator does not light d The corresponding segments of all digits do not light up or they continue to light up e Wrong figure appears f A certain group of indicators do not light up g The figure of all digits flicker 2 3 Other possible problems caused by defective control unit a Buzzer does not s...

Page 20: ... C voltmeter The meter should indicate 120 volts if not check oven circuit RY1 RY3 RY4 RY5 and RY6 Relay Test These relays are operated by D C voltage Check voltage at the relay coil with a D C voltmeter during the microwave cooking operation DC voltage indicated Defective relay DC voltage not indicated Check diode which is connected to the relay coil If diode is good control unit is defective REL...

Page 21: ...mately 160Ω 10 If any abnormal condition is detected replace the control unit 7 Reconnectallleadsremovedfromcomponents during testing 8 Re install the control unit to the control panel and re install the control panel to the oven 9 Reconnect the power supply cord 10 Run the oven and check all functions 2 Follow the troubleshooting guide given below if indicator does not light up after above check ...

Page 22: ...the food ERROR will appear and the oven will shut off Water load cooking test WARNING The oven should be fully assembled before following procedure Make sure the oven has been plugged in at least two minutes before checking sensor cook operation The cabinet should be installed and screws tightened 1 Fill approximately 200 milliliters 7 2 oz of tap water in a 1000 milliliter measuring cup 2 Place t...

Page 23: ...en chassis by using insulation tape 8 After that procedure re connect the power supply cord 9 Check the sensor cook operation proceed as follows 9 1 Touch the TIMER CLOCK pad once the POWER LEVEL pad twice the START pad once and the number pad 1 once and the number pad 4 once 9 2 The control panel is in the sensor cooking operation 9 3 After approximately 65 seconds push plunger of select switch f...

Page 24: ...ICATION OF OHM METER Between source and source Open Circuit Between terminal source and load Short Circuit Between terminal source and load Short Circuit If incorrect readings are obtained replace the noise filter 6 Reconnect all leads removed from components during testing 7 Re install the outer case cabinet 8 Reconnect the power supply cord after the outer case is installed 9 Run the oven and ch...

Page 25: ... Inverter Unit Control Circuit This is the circuit to control inverter unit The touch control section consists of the following units as shown in the touch control panel circuit 1 Key Unit 2 Control Unit The Control unit consists of LSI Unit and Power U nit The principal functions of these units and the signals communicated among them are explained below Key Unit The key unit is composed of a matr...

Page 26: ... connected to the A D converter built into the LSI for R 2120J 11 P57 OUT Oven lamp fan motor stirrer motor and inverter unit driving signal To turn on and off shut off relay RY1 The square waveform voltage is delivered to the RY1 driving circuit 12 P56 OUT Signal to sound buzzer 2 0 kHz A key touch sound B Completion sound 13 P50 OUT Terminal not used 14 18 P54 P50 OUT Used for initial balancing ...

Page 27: ...ignalappliedtotouch keysection ApulsesignalisinputtoP43 P46terminalwhileone of G8 line keys on key matrix is touched 37 P23 OUT Key strobe signal Signalappliedtotouch keysection ApulsesignalisinputtoP43 P46terminalwhileone of G9 line keys on key matrix is touched 38 P22 OUT Key strobe signal Signalappliedtotouch keysection ApulsesignalisinputtoP43 P46terminalwhileone of G10 line keys on key matrix...

Page 28: ...4 SEG 6 66 SEG 6 11 SEG 18 54 SEG18 23 SEG 5 67 SEG 5 10 SEG 17 55 SEG17 22 SEG 4 68 SEG 4 9 SEG 16 56 SEG16 21 SEG 3 69 SEG 3 8 SEG 15 57 SEG15 20 SEG 2 70 SEG 2 7 SEG 14 58 SEG14 19 SEG 1 71 SEG 1 6 SEG 13 59 SEG13 18 SEG 0 72 SEG 0 5 SEG 12 60 SEG12 17 73 74 VCC VREF IN Connected to GND 75 AVSS IN Connected to VC 76 COM3 OUT Common data signal Connected to LCD signal COM4 77 COM2 OUT Common dat...

Page 29: ...tration One thermistor is housed in the closed vesselfilledwithdryairwhileanotherintheopenvessel Each sensor is provided with the protective cover made of metal mesh to be protected from the external airflow 2 Operational Principle of Humidity Sensor The figure below shows the basic structure of a humidity sensor A bridge circuit is formed by two thermistors and two resistors R1 and R2 The output ...

Page 30: ... itself is so short that the two can t be separated For those models check and repair all the controls sensor related ones included of the touch control panel while keeping it connected to the oven B On some models the power supply cord between the touch control panel and the oven proper is long enough that they may be separated from each other For those models it is possible to check and repair t...

Page 31: ...y solder it is recommend that a dedicated bit is used and that the iron temperature is adjusted accordingly 3 Soldering As the melting point of lead free solder Sn Ag Cu is higher and has poorer wettability flow to prevent damage to the land of the PWB extreme care should be taken not to leave the bit in contact with the PWB for an extended period oftime Removethebitassoonasagoodflowisachieved The...

Page 32: ...t or latch hook is damaged 3 The door gasket or seal is damaged 4 The door is bent or warped 5 There are defective parts in the door interlock system 6 There are defective parts in the microwave generating and transmission assembly 7 There is visible damage to the oven Do not operate the oven 1 Without the RF gasket Magnetron 2 If the wave guide or oven cavity are not intact 3 If the door is not c...

Page 33: ...outer case cabinet 9 Remove the cord bushing and the power supply cord from the outer case cabinet 10 Now the power supply cord or the outer case cabinet is free CAUTION 1 DISCONNECT OVEN FROM POWER SUPPLY BEFORE REMOVING OUTER CASE 2 DISCHARGE THE HIGH VOLTAGE CAPACITOR BEFORE TOUCHING ANY OVEN COMPONENTS OR WIRING Left tab Screws Right tab Hood louver 1 Disconnect the power supply cord and remov...

Page 34: ... the wire leads from the fuse holder 14 Remove the one 1 screw holding the hood duct R to the oven cavity top plate 15 Remove the hood duct R from the oven cavity top plate 16 Remove the one 1 screw holding the fan duct to the oven cavity top plate 17 Remove the fan duct with the inverter unit and the fan motor from the oven 18 Remove the three 3 screws holding the inverter unit to the fan duct 19...

Page 35: ...rt a putty knife into the gap between the table tray assembly and the oven cavity front plate And remove the table tray assembly from the oven cavity 2 Install the stirrer motor left one to the oven cavity with the two 2 screws 3 Reconnect the wire lead to the stirrer motor left one referring to the pictorial diagram 4 Make sure that the stirrer motor gear stirrer shaft assembly and shield spring ...

Page 36: ...ONNECTORS TO THE TERMINALS IN STALL THE POSITIVE LOCK SO THAT THE LEVER FACES YOU POSITIVE LOCK CONNECTOR NO CASE TYPE REMOVAL Positive lock connector 1 Disconnect the power supply cord 2 Open the door and block it open 3 To discharge the high voltage capacitor wait for 60 seconds 4 Remove three 3 screws holding the hood louver to oven cavity front face plate 5 Remove the hood louver from the oven...

Page 37: ...le tray assembly 3 Remove the table tray assembly from the oven cavity 4 Now the table tray assembly is free Table Tray assembly removal Reinstallation 1 Remove the two 2 stirrer fans 2 Clean the oven cavity bottom plate and or under the antenna plate assembly by a vacuum cleaner 3 Reinstall the two 2 stirrer fans to the stirrer shafts 4 Make sure that the flat edge of the table tray assembly This...

Page 38: ...front flange fan duct base plate R and magnetron duct And remove the hood intake duct R 5 Remove the control panel assembly referring to the procedure of CONTROL PANEL ASSEMBLY CONTROL UNIT AND KEY UNIT REMOVAL If the stop switch primary interlock switch secondary interlock switch and monitor switch do not operate properly due to a misadjustment the following adjustment should be made 6 Loosen the...

Page 39: ...f the following 1 Door latch heads smoothly catch latch hook through latch holes and that latch head goes through center of latch hole 2 Deviation of door alignment from horizontal line of cavity face plate is to be less than 1 0mm 3 Door is positioned with its face pressed toward cavity face plate 4 Re install outer case and check for microwave leakage around door with an approved microwave surve...

Page 40: ...e four 4 screws holding the door panel to the door frame assembly 12 Release the door panel from the door frame assembly NOTE It iseasiertoreleasetheengagingpartsoftheupper or lower door hinge pin side at first 13 Now door frame assembly is free LATCH SPRING LATCH HEAD AND DOOR PANEL 14 Release the latch spring from the tab of the latch head and tab of the door frame 15 Release the latch head from...

Page 41: ...D RED BLU RED ORG BLK BLK PRIMATY INTERLOCK SWITCH STOP SWITCH SENSOR GROUND WIRE ORG HOOD FAN MOTOR STIRRER MOTOR STIRRER MOTOR 1 2 3 4 5 6 WHT RED YLW BLU BLK WHT RED YLW BLU BLU BLK 2 1 3 4 BRN WHT RED RED ORG ORG RED WHT 1 3 2 YLW PPL 5 4 3 2 1 ORG BLK CN C CN H CN B RY3 N O T1 CN E CN H CN G CN E 1 1 1 3 1 3 2 13 HOOD FAN THERMAL CUT OUT HOOD LAMP AND SOCKETS To GND GRN GRN WHT ORG 9 8 7 6 5 ...

Page 42: ...40 PMOR3021S PMOR3021B PMOR3021R 6 4 5 1 2 3 6 4 5 1 2 3 A B C D E F G H A B C D E F G H Figure S 2b Power Unit Circuit ...

Page 43: ...41 PMOR3021S PMOR3021B PMOR3021R 6 4 5 1 2 3 6 4 5 1 2 3 A B C D E F G H A B C D E F G H Figure S 3b LSI Unit Circuit ...

Page 44: ...42 PMOR3021S PMOR3021B PMOR3021R Figure S 4 Printed Wiring Board 6 4 5 1 2 3 6 4 5 1 2 3 A B C D E F G H A B C D E F G H ...

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