Hello again! some time ago purchased this cd player with the usual broken laser head stepper gear, I replaced it, but it's still dead.
When switched on, the motor that moves the cd rotates at full speed (or fast) and eventually stops, no matter if the cover is open or not, as if the closing switch is ignored, the lens tries to focus, but the laser is not perceived. There is no other head movement.
I notice that the R176 resistor gets very hot, I don't know if this is normal, however the resistor measures 327 Ohms which according to the schematic is 330Ohm which seems correct to me. The consumption of the single board on power on alone is 0.12A which seems a lot to me, around 1w for only the LCD?,
The voltages indicated on IC101, IC 841 and IC 871 are correct.
On the CD802 connector pins 1 and 2 receive about 1,7v if we act on the SK130 switch (door switch).
Is there any way to know if the laser is damaged? I think there is no replacement now if it is damaged. Any help is appreciated. Thank you very much!
When switched on, the motor that moves the cd rotates at full speed (or fast) and eventually stops, no matter if the cover is open or not, as if the closing switch is ignored, the lens tries to focus, but the laser is not perceived. There is no other head movement.
I notice that the R176 resistor gets very hot, I don't know if this is normal, however the resistor measures 327 Ohms which according to the schematic is 330Ohm which seems correct to me. The consumption of the single board on power on alone is 0.12A which seems a lot to me, around 1w for only the LCD?,
The voltages indicated on IC101, IC 841 and IC 871 are correct.
On the CD802 connector pins 1 and 2 receive about 1,7v if we act on the SK130 switch (door switch).
Is there any way to know if the laser is damaged? I think there is no replacement now if it is damaged. Any help is appreciated. Thank you very much!
Attachments
Thanks for the link, I read that thread some time ago, but I not could find coincidences. Now finally solved the problem.
I wanted to know what was the behaviour of the cd at start-up, as the cd was spinning madly and I did not perceive that the laser was turning on. I followed the line of the gate closure detector, SK130, the signal reached the TS807 transistor, but did not reach the IC100 pin 22. Observing with more light under the microscope there was a small break in the tracks that prevented the continuity, eureka! I bridged the area with some fine wires and it works correctly. Big success!
I wanted to know what was the behaviour of the cd at start-up, as the cd was spinning madly and I did not perceive that the laser was turning on. I followed the line of the gate closure detector, SK130, the signal reached the TS807 transistor, but did not reach the IC100 pin 22. Observing with more light under the microscope there was a small break in the tracks that prevented the continuity, eureka! I bridged the area with some fine wires and it works correctly. Big success!