Toshiba MR-2020, MR-2017 service manual Reset Circuit

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3.4.3Reset Circuit

Fig. 3-10

This circuit generates a reset signal when the power is turned ON and the power voltage is blocked or cut off/lowered temporarily.

At the power-ON, the circuit shifts the level of the reset signal from “L” to “H” to put the CPU in a opera- tive state after the reset pulse duration (Tpd) determined by the capacitance of C58 has passed from when the power voltage has reached the supervisory voltage (Vs) divided by R116 and R117.

When a power voltage drop (cutoff, temporary cutoff, temporary low voltage) occurs and the power volt- age becomes lower than the set value for the supervisory voltage for the power, the circuit sets the level of the reset signal (RESET) to “L” to put the CPU in a halt state.

3.4.4Drive Circuit for Pickup Solenoid

3

Fig. 3-11

Pick up solenoid is a two-way solenoid that can be operated both in suction and recovery, and driven by two transistors (Q4 and Q2) for each operation respectively.

When the PSOL-ON-Signal level is set to “L”, Q4 is turned ON, the power of 24V is applied to the coil for suction operation, the solenoid is turned ON, and then the pickup roller goes down.

When the PSOL-ON-Signal level is set to “L”, Q2 is turned ON, the power of 24V is applied to the coil for recovery operation, the solenoid is turned OFF, and then the pickup roller goes up.

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MR-2017/2020

 

DESCRIPTION OF OPERATIONS

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Contents MR-2017/2020 Trademarks 09/12 Page Contents Control PC Board Circuit MR-2017 MR-2020 SpecificationSpecification Location Components Main ComponentsR4 R2 R3 R1 Sectional ViewOriginal tray Registration roller Original exit tray Intermediate transfer rollerSW M1 SOL S7 ADF Electric Parts LayoutSymbol Name Function Symbols and Functions of Various ComponentsADF control PC board ADF Controls the ADF Board Diagram of Signal Blocks RxD Description of Interface SignalsFeed motor drive section Read motor drive section Description of OperationsOriginal feed motor drive section Read motor Exit roller Pre-reading roller Read motor drive sectionOriginal width size Orange Yellow Gray Original Size DetectionCover OPEN? All sensors OFF? Power on Standby ADF jam accessEmpty sensor ON? Certain period Time passed? OriginalRead motor rotates Certain period Scanning start signalSent level High Jam Read motor stops Original exitDescription of Circuit Drive Circuit for Read Motor Reset Circuit Description of Operations Front cover CoverFront cover Rear cover Jam access coverRear cover PinLeft cover Jam access coverLeft cover Bushing Screw Original trayPaper feeder unit RollerClip Feed roller PM Pickup roller PMShaft Clip Pickup rollerShaft PulleySeparation roller unit Separation roller PMOriginal tray Feeder lower guideStay Exit roller Registration rollerExit roller Exit guideIntermediate transport roller Pre-reading guideHinge pin Pre-reading guidePre-reading roller ConnectorPost-reading roller Screw BushingBushing Ring Pulley Timing belt Flange Bearing Bushing Pulley RingHolder Upper guide Original feed motor M1 Motor / Motor drive sectionSpring Harness clamp Original feed motor drive sectionRing Bushing Bracket WhiteRead motor Read motor M2Spring Read motor drive sectionBracket Screw Tensioner Ring Original pickup solenoid SOL SolenoidOriginal pickup solenoid Mark-off lineOriginal tray width sensor S2 Sensor/switchOriginal tray sensor Original tray sensor S1Original empty sensor S3 Jam access cover sensor S7Metal plate cover Original empty sensor Original registration sensor Original registration sensor S4Original exit/reverse sensor S6 Read sensor S5Radf opening/closing sensor ADF opening/closing sensor S8Bracket Jam access cover opening/closing switch SWWhite Red Black ADF control PC board ADF board PC BoardADF board Hinge stopper OthersChecking Adjustment of PositionAdjustment Adjustment Match the screw hole positions Install the right-hand hinge screw at the rear Place the platen sheet on the original glass ~0.2mm 0mm Adjustment of HeightTurn it clockwis 19 Chart Original Adjustment of SkewAdjustment 23 Chart Original Adjustment of the Leading Edge PositionAdjustment of Horizontal Position Adjustment of Copy Ratio Adjustment of ADF Opening/Closing Sensor Troubleshooting for Mechanical Errors TroubleshootingTroubleshooting for Electrical Errors Jam Feed signal reception jamJam not reaching the original registration sensor Jam not reaching the read sensorStop jam at the registration sensor Radf jam access cover openStop jam at the read sensor Stop jam at the exit sensorCover open jam in the read ready status Troubleshooting Cleaning Lubrication/Coating Replacement Operation check Periodic MaintenanceRemarks CoatingRewriting ROM Firmware Updating Assembly of PC Board Circuit Diagram / Harness DiagramPWA-F-DLG-644 Circuit DiagramPWA-F-DLG-643 Control PC Board Circuit Circuit Diagram / Harness Diagram Circuit Diagram / Harness Diagram Circuit Diagram / Harness Diagram Circuit Diagram / Harness Diagram Circuit Diagram / Harness Diagram Circuit Diagram / Harness Diagram

MR-2020, MR-2017 specifications

The Toshiba MR-2017 and MR-2020 are innovative microwave ovens that exemplify Toshiba's commitment to advanced cooking technology and user-friendly design. Designed for modern kitchens, these models combine efficiency and versatility, making them ideal for a wide range of cooking tasks.

The MR-2017 features a compact design perfect for small spaces without compromising on power and functionality. It typically boasts a 700-watt microwave output, providing sufficient energy for heating and cooking various dishes. One of its standout features is the one-touch cooking options, which allow users to select heating times and power levels with a simple press of a button. This functionality is particularly advantageous for busy individuals looking to save time in meal preparation.

On the other hand, the MR-2020 offers enhanced capabilities with a slightly larger capacity and a higher wattage output of 800 watts. This model not only heats food but also includes grill and convection settings, allowing for more versatile cooking methods. With the grilling function, users can achieve crispy textures similar to conventional ovens, while convection cooking promotes even heat distribution for consistent results.

Both models are equipped with advanced technology such as the smart sensor cooking feature. This technology automatically calculates the optimal cooking time based on the food type and quantity, ensuring perfectly cooked meals without any guesswork. Safety is also a priority, with child safety locks that prevent accidental operation, making them suitable for families.

The control panel on both the MR-2017 and MR-2020 is designed for ease of use, featuring intuitive buttons and a clear display, making it accessible for all users. Additional features include defrost settings for quick thawing and various pre-set cooking modes tailored for specific food types like popcorn, pizza, and baked potatoes.

In conclusion, the Toshiba MR-2017 and MR-2020 microwave ovens blend advanced cooking technologies with user-friendly features, catering to diverse culinary needs. Their combination of power, safety, and convenience makes them a valuable addition to any kitchen, ensuring that delicious meals are just minutes away. Whether you're reheating leftovers or trying out new recipes, these models are built to deliver performance and satisfaction.
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