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We have Elo model ET1987c-4 sw-1 open frame monitors We have found that we have to much HT voltage going to the line output transformer, the voltage regulator (IRFS634B) goes short also the Line output transistor (C5387) goes short circuit, also resistor R571 goes open circuit. Can anyone help a schematic of this model would be a Godsend as we have about 5 of this monitors and all seem to have same problem.

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  • admin586 Feb 29, 2008

    would be prepared to pay for correct circuit diagram for the ELO ET1987C-4

  • Anonymous Mar 27, 2014

    need pdf for manual

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I have the schematic on this board if you would like to send me a email ill send it to you..

Posted on Dec 10, 2008

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The frame amplifier, like the line amplifier, will not work if there is no output from the oscillators for them to amplify.

Early 405 line sets didn't have a frame oscillator as they used the sine wave from the AC mains but I believe the later sets needed a frame oscillator and a sync signal from the rf demodulator to prevent instability.

Transistors rarely fail by themselves and it is often external factors that cause them to overheat and fail and an essential part of the repair process is discovering what factors caused the initial problem. Modern circuits use a lot of multi-transistor dc coupled stages and it is often the bias of an earlier stage that is the culprit.

The frame output transformer is usually very robust and much less likely to fail than a line output transformer. I suggest you ensure the correct operation of the oscillators before going any further.

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Dose the fuse on the inverter board check out OK? You can use other inveter board as long as the lamp connectors are the same and you just have to match the input signal pin. I have done many.
http://s807.photobucket.com/home/budm/allalbums

http://en.wikipedia.org/wiki/Capacitor_plague
See example of the fuse on the inverter board.


3209760.jpg

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You have a frame collapse problem. Line, EHT, power supply, video and sound stages are all functioning. Check frame output ic for dry joints, resolder all pins. HT supply for output ic's derived from line stage check for open circuit safety resistors around line output transformer, if you find any then frame output ic will also be suspect. WARNING Very high voltages exist around the line stage. Make cold tests with Ohm meter with set unpluged from mains supply.

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1 Answer

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No picture sound ok
Note 1 a Raster is the name for a screen made of lines of brightness
Note 2, A Blank raster has no snow or picture, its just a lit up screen

Sound ok but no raster.
First increase tube's first anode voltage (knob on the loptx) to see if the screen is just too dark.
if after you have turned up the bottom knob on the loptx, there is still no brightness,check, for crt heaters, and EHT 25kv and focus voltage (2kv) and A1's/Screen/G2 voltage is 300-600v.
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Trace the pcb back from the BASE leg to find the line driver stage,
Its usually a very small transformer (4/5 legs) and a transistor connected to it,
The driver transformer legs(pins) will be two with voltage and two without
The two with power will either be about HT level (110v=145v) or about LT level(25v)
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linedrv.jpg
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Hope it may help you;
Regards,
VOTIT

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