Polar 78E no display

Hi,
We have a Polar 78E without maintenance documentation or other manuals.
yesterday, the screen didn't display anything, and it's like the cutter didn't start (nothing is abble to move).
The leds on card are on, but one is red (the card with the battery).
Does anyone have the manuals or is able to explain us what appends?
Thank you
Marc

 

Hi sir.
The first thing to do is test the power supply for Keyboard +display +9vdc
he tolerance must be -8.4+9.6 is there out your REPLACE or repair.
then +5+24+42 -12 -30 the tolerance must be 0.5% above or below otherwise is faulty and replace.
See if you have more that 10% of variable voltage in the input of his machine.
And adjust primary TAP of main transformer, according with his input voltge example: 220Vca or 380Vca ??

 

Hi, my display´s polar 78 began to show lines a time ago, two weeks ago display is running but very slowly (until almost 30 minutes)
and today it didn´t show anything.

Any advice?

Thank you.

 

Hi sir The first thing to do is test the power supply for Keyboard +display +9vdc
he tolerance must be -8.4+9.6 is there out your REPLACE or repair.look for Dry Solder +colder Solder joint then +5+24+42 -12 -30 the tolerance must be 0.5% above or below otherwise is faulty and replace.
See if you have more that 10% of variable voltage in the input of his machine.
And adjust primary TAP of main transformer, according with his input voltge example: 220Vca or 380Vca ??