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Roland RS-640 turns off during printing

G

greg_efremov

New Member
Problem with RS-640 printer.
When it print, signal 41V_control switched from 0V to 5V. And power supply switched off +41V voltage and printing, moving - all stopped. And the screen light off also. Voltage +5V is present. During printing all voltages +5, +41 is normal, without pulsations.
Transistor Q1 on motherboard and optocoupler on PSU undamaged, whats wrong?
 
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