Since the motor signal was delayed for longer than that period, the voltage divider wasn't being powered during measurment so the MCU thought the batteries were dead: it instantly turned off. When the printer is turned on, the motor is powered during a very shot period, just enough to measure voltage but not enough to make it spin. The schematics revealed that the voltage divider used by the MCU to measure battery voltage was only powered when the motor was on (to prevent it from always draining current). It can either go to sleep mode (low power) or kill itself by setting that output tried delaying the motor control signal to avoid wasting 10km of tape each time he needed a label, but surprisingly that made it impossible to turn on the printer. It shorts a line to ground when pressed and powers up the MCU, which then keeps itself alive via a /powerdown output. The power button is independent from the keyboard matrix. It simply expects it to always run at the same speed and sends lines to the print head at steady intervals. Since this printer doesn't do barcodes, they saved on costs and didn't give a way to the MCU to know how fast the motor is going. This makes the tape move at a constant speed whatever the battery voltage is (in a reasonable range, say 9~7V). The BA6620 analog chip "kicks" the motor for a quick start and regulates its speed by using more of less of the 9V supply. Maybe for saving memory, or to extend the whole device's useful lifespan in case some heating elements burn out. It appears that the pixels are doubled, making the resolution 32 pixels instead of 64. They're latched shortly after and Strobe goes low for 4.38ms (heating time). It could go up to 5MHz if the driver is indeed a S4622A. The E100 uses quite a high clock speed: 1.5MHz. Tested to ISO standards, they are the have been designed to work seamlessly with your Brother printer. The heaters are powered with +9V and the driver chip with +5V. Original Brother ink cartridges and toner cartridges print perfectly every time. The strobe signal enables the latch output which turns on the selected heating elements, transfering ink to the label. BTG-12816D-TAWA-N-G-A1: BeyondTek Graphic 128x16 dots STN gray.Įach line's pixels are clocked in a 64-bit shift register, then latched.
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