TOUCH CONTROL PANEL ASSEMBLY
OUTLINE OF TOUCH CONTROL PANEL
The touch control section consists of the following units as shown in the touch control panel circuit.
(1)Control Unit
(2)Key Unit
The principal functions of these units and the signals commu- nicated among them are explained below.
1.Control Unit
Signal of key touch and oven function control are all processed by one microcomputer.
1)Power Supply Circuit
This circuit changes output voltage at the secondary side of the low voltage (T1) transformer to volatges required at each part by full wave rectifying circuit, constant voltage circuit, etc..
2)ACL Circuit
This AC voltage is then half wave rectified by D61/D62 and smoothed (filtered) by C61/C62.
This AC voltage is the input to the IN3 and IN5 ports of IC1, which determines if there is a magnetron / high voltage problem.
HIGH VOLTAGE TRANSFORMER
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| HIGH VOLTAGE CIRCUIT | |
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| MAIN BODY SIDE | |
CT1 or CT2 |
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| T/C SIDE | |
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RY3 or RY4 |
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R61 or | R65 or |
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R62 | R66 |
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| C61 or C62 | ||
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| IC1 | |
D61 or | R63 or | D63 or | IN3 or | ||
IN5 PORT | |||||
D62 | R64 | D64 |
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This is an
Vc
3)Power SYNC Signal Generating Circuit
This is a circuit for generating power SYNC signal by virtue of the secondary side output of transformer T1. This signal is used for a basic frequency to time process- ing and so on.
4)Clock Circuit
This is a circuit for controlling clock frequency required for operating IC1.
5)IC1 (Main Processor)
This is a
6)IC2 (Memory Processor)
This is a memory IC, responsible for memory function.
7)Display Circuit
This is a circuit for driving display tubes by IC1 output.
8)Key Input Circuit
This is a circuit for transmitting key input information to IC1.
9)Sound-body Driving Circuit
This is a circuit for driving sound body by IC1 output.
10) Relay Driving Circuit
This is a circuit for driving output relay by IC1 output.
11) Stop Switch Circuit
This is a circuit for driving IC1 to detect door opening/ closing.
12) Exhaust Air Temperature Detecting Circuit
This is a circuit for transmitting output change of thermistor (Exhaust Air Temperature Sensor) to IC1.
13) High Voltage Monitoring Circuit.
This circuit detects problems in the magnetron / high voltage circuit by sensing a variation in the current flowing through the primary winding of the high voltage transformer.
During heating, the primary current of the high voltage transformers also flows through the primary winding of the current transformers CT1 and CT2. This causes a current to be induced in the secondary windings of CT1/ CT2 and results in an AC voltage which is determined by R61/R62.
Figure T-1. High Voltage Monitoring Circuit
14)Magnetron Temperature Circuit. (Detect Noload or Fan Lock)
This is a circuit for transmitting output change of thermistor (Magnetron Temperature Sensor) to IC1.
15) Intake Air Temperature Detecting Circuit.
This is a circuit for transmitting output change of thermistor (Intake Air Sensor) to IC1.
2. Key Unit
The key unit is composed of a matrix circuit in which when a key it touched, one of signals P11, P12, P15, P16 and P17 generated by the LSI, is passed through the key and returned to the LSI as one of signals
Memory No. | Cook Time | Output Power |
1 | 5sec. | 100% |
2 | 10sec. | 100% |
3 | 20sec. | 100% |
4 | 30sec. | 100% |
5 | 40sec. | 100% |
6 | 50sec. | 100% |
7 | 1min. | 100% |
8 | 1min.15sec. | 100% |
9 | 1min.30sec. | 100% |
10 | 2min. | 100% |
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| (fig. 1) |
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This model has a double quantity pad. When the oven is shipped, Magnification "1.8" is preset in the double quantity pad. This model has an defrost pad. When the oven is shipped, defrost is set as follows: fig.2.
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| 1 STAGE |
POWER |
| 10% |
OVEN ON/OFF |
| ON |
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| (fig. 2) |
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