Schematic diagram of clock electronics g 9.04. Repair of desktop electronic clock. Assignment of control buttons
Schematic diagram of the clock is shown in fig. It contains three high-level integrated circuits of the K176 series, two transistors and 36 other discrete elements. Indicator - flat multi-digit, cathode-luminescent, with dynamic indication IVL1 - 7/5. It has four 21mm high digits and two separating dots arranged vertically.
The generator of second and minute pulses is made on a microcircuit - IMS1 K176IE18. In addition, this microcircuit creates pulses with a repetition rate of 1024 Hz (pin 11) used to operate the signaling device. To create an intermittent signal, pulses with a repetition rate of 2 Hz are used (pin 6). A frequency of 1 Hz (pin 4) creates the effect of "flashing" of the dividing points. Pulses with a repetition rate of 128 Hz, shifted relative to each other in phase by 4 ms (pins 1, 2, 3, 15) are fed to the grids of four digits of the indicator, ensuring their consistent glow. Switching of the corresponding counters of minutes and hours is carried out with a frequency of 1024 Hz (pin 11). Each pulse applied to the indicator grids is equal in duration to two periods of a frequency of 1024 Hz, i.e. the signal supplied to the grid from the counters will be switched on and off twice. This selection of the frequency of in-phase pulses provides two effects: dynamic indication and pulse operation of the decoder and indicator.
Integrated circuit IMS2 K176IE13 contains counters of minutes and hours of the main clock, counters of minutes and hours for setting the time of the signaling device, as well as switches for switching the inputs and outputs of these counters. The outputs of the meters through the switch are connected to the binary code decoder into a seven-element indicator code. This decoder is made on the IMZ K176IDZ chip. The outputs of the decoder are connected to the corresponding segments of all four digits in parallel. When the button S2 “Call” is released, the indicator is connected to the hour counters (to recognize this mode, the dot flashes at a frequency of 1 Hz). By pressing the button S6 "Corr.", the hour counters (K176IE13 microcircuit) and the dividers of the minute pulse sequence generator (K176IE18 microcircuit) are set to the zero state. After releasing the S6 button, the clock will work as usual. Then, by pressing the buttons S3 "Min" and S4 "Hour", the minutes and hours of the current time are set. In this mode, it is possible to turn on the sound signal. When the button S2 "Call" is pressed, the counters of the signaling device are connected to the decoder and indicator. In this mode, four digits are also displayed, but the flashing dots go out. By pressing the button S5 "Bud" and holding it, press the buttons S3 "Min" and S4 "Hour" in sequence, set the required time for the alarm device to operate, observing the indicator readings. The clock circuit allows you to set a reduced brightness of the indicators using the S1 "Brightness" button. However, it should be remembered that when the brightness is reduced (button S1 is pressed), turning on the sound signal, as well as setting the time of the clock and the alarm device is not possible.
The power supply unit BP6 - 1 - 1 contains a network transformer T, which creates a voltage of 5 V (with a midpoint) to power the glow of the indicator cathode and a voltage of 30 V to power the rest of the indicator circuits and microcircuits. A voltage of 30 V is rectified by a ring circuit on four diodes (VD10 - VD13), and then, using a stabilizer on a zener diode VD16, a voltage of +9 V is created relative to the "case" to power the microcircuits, and using a stabilizer on zener diodes VD14, VD15 and a transistor VT2 - voltage + 25 V (relative to the cathode) for powering grids and indicator anodes. The power consumed by the clock is not more than 5 watts. A backup power connection is provided to save the time of the clock when the network is turned off. Any 6…9V battery can be used.
Literature MRB1089
« Electronics G9.04"- a desktop electronic quartz clock with mains power, produced under the brand name" Elektronika "in the USSR in the 80s.
Design and principles of operation
The case is plastic and has the shape of a rounded beige parallelepiped, the front frame is black, the indicators are covered with dark green transparent plastic. The time is displayed in 24-hour format using five vacuum fluorescent indicators: there are four IV-12 for displaying numbers and one IV-1 for displaying a separator in the form of a dot and underline. The dot blinks, measuring seconds.
The clock has a compartment for a battery type "Krona". The battery power is used to keep running in the absence of mains power, while the indicators do not light up.
You can choose between two brightness levels for the indicators.
The clock is built on eight microcircuits of the K176 series and a quartz resonator. There is a trimmer capacitor for stroke adjustment, available without opening the case.
Specifications
Power Options: 220V AC, 0.25A.
Dimensions: 125 x 165 x 112 mm.
Model index: G9.04.
Cost at release: 35 rubles.
- At the time of the transition to zero hours for half a second, the indicator displays the time 24:00.
- When you turn it on for the first time (or when there is a power failure), the clock starts counting from 00:11.
- The buttons used to set the hour and minute value have the following effect: while the button is pressed, the corresponding value increases by 1 every second. Thus, it will take a minute to set the value to "59 minutes".
- Button labels do not use text or letters. Instead of signatures, icons are applied: a circle, a square, a triangle and a triangle with a line under it ("Eject icon").
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Description of electronic watch repair Janus, made in the USSR. The basis of this clock is the K145IK1901 microcircuit - a common Soviet controller for building electronic clocks. Time is displayed on the big indicator IVL1-7/5 of green color. Based on the experience of working and repairing such watches, it can be concluded that most often the quartz resonator fails, the electrolytic capacitors dry out, and the electrovacuum indicators die out. Indicators that failed due to a burned out filament have not yet come across. Of course, it is best to repair any electronics with a circuit. Here are two similar diagrams. If anything, the K145IK1901 and KR145IK1901 microcircuits are interchangeable during repairs.
The second version of the scheme
Assignment of control buttons
- SB1- "M" - setting the current time in minutes, in the "T" mode - in seconds;
- SB2- "H" - setting the current time in hours, in the "T" mode - in minutes;
- SB3- "K" - correction of the current time;
- SB4- "C" - stopwatch mode;
- SB5- "O" - stop indication;
- SB6- "T" - timer mode;
- SB7- "B1" - the "alarm clock 1" mode, the time is set using the "H" and "M" buttons.
- SB8- "B" - calling the indication of the current time, for example, after setting alarms;
- SB9- "B2" - "alarm clock 2" mode.
In this case, the clock lay idle for a long time and finally, after 5 years, it was needed. At first, there was an idea to buy ready-made LED ones - with large numbers, 5-10 centimeters high. But looking at the price for 1000 rubles, I realized that it was better to revive the old ones.
We disassemble the case and inspect the circuit with details - everything is quite complicated, compared to modern ones. The power supply seems to be simple - transformerless, but then the reduced voltage of 10 V is converted by a very cunning inverter on a multi-winding ring into 27 volts of power supply for the IVL-1 indicator anode.
There are no signs of life, the fuse and diodes are normal, but the power supply to the filter capacitor (1000 microfarads 16 V) is only 4 volts.
We take a laboratory adjustable power supply and supply the clock with the voltage of 10 V set according to the scheme, controlling the current. Everything worked - the indicator lit up and the point of seconds began to flash. The current was about 80 mA.
Obviously the problem is with the capacitor. And the culprit was not the filter electrolyte, as you might immediately think, but a ballast network that had almost lost its capacity, at 400 V 1 microfarad. At the same time, a second similar one was soldered to him, and when connected to a 220 V network, the device started working. The voltage immediately rose to 10.4 V.
On this, the repair can be considered completed, and the 1000 rubles already allocated for the purchase can be considered saved. From this we conclude: do not be lazy to repair household appliances and electronics on your own, because in addition to saving money on buying a new one, you will feel the joy of a job well done and pride in your home :)
Your attention - two electrical circuit diagrams of the Soviet watch "Electronics G 9.02" (Appendix 1 and Appendix 2). Originals, whole.
You are guaranteed to get what you see in the photo!
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