What to do if my Casio DR-120XA has poor printing, the motor doesn't stop, or digits are missing?
If your Casio Calculator experiences poor printing, the motor doesn't stop, or digits are missing, the issue might stem from a bad timing signal. Inspect the printer block detector and the timing signal. Another potential cause could be a defective printer magnet.
Why my Casio DR-120XA does not work at all?
If your Casio Calculator does not work at all, the reason may be a defective power transformer. In this case, check if VDD, VSS, VM, VF1, and VF2 are OK. Another possible cause is a defective LSI, so examine the waveforms of each pin.
How to fix a Casio DR-120XA Calculator with a poor display?
A poor display on your Casio Calculator could be caused by a defective LSI. Also, check for short or open circuits between digit signals and segment signals, specifically between the LSI and the display tube. Another potential reason is a defective display tube.
What to do if my Casio Calculator has no display?
If your Casio Calculator has no display, it could be due to several reasons. First, check if there's no voltage at VF1 and VF2. Also, the issue might be a missing digit or segment signal; in this case, check the pulse signals from LSI. Finally, if VF1, VF2, Digit and Segment signals are OK, the display tube might be defective.
Detailed schematic diagram of the main circuit board.
Circuit diagram illustrating the keyboard input matrix and connections.
Diagram of the slide switch board and its connection to mode selection.
Diagram showing pin connections and signal timing for the printer mechanism.
List of parts and quantities for the PCB L224-1 assembly.
List of parts and quantities for various PCB units.
List of general components and miscellaneous parts for the device.
General| Brand | Casio |
|---|---|
| Model | DR-120XA |
| Category | Calculator |
| Language | English |
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