Hi,
Before it gets consigned to the bin, I thought I would ask here just in case someone has any thoughts...
I have a CDM4/56 based CD player that although the laser appears to be functioning, the focus mech _seems_ to be broken i.e it doesnt not lift up/down at all to try and achieve focus. I have tested voltages, replaced the usual capacitor suspects on the servo board, checked continuity all the way through the riboon cable to the two solder points on the mech itself, tested voltages arrive at the solder points when focus should be occuring.
Ive read that a resistance of around 25ohms should be seen across the two points but I am getting an open circuit. In fact testing this on another identical player I have, I do get a resistance reading around that value as expected.
Anything I have missed?
Would be interested to hear your views on the repairability of the module at this point
Thanks
Before it gets consigned to the bin, I thought I would ask here just in case someone has any thoughts...
I have a CDM4/56 based CD player that although the laser appears to be functioning, the focus mech _seems_ to be broken i.e it doesnt not lift up/down at all to try and achieve focus. I have tested voltages, replaced the usual capacitor suspects on the servo board, checked continuity all the way through the riboon cable to the two solder points on the mech itself, tested voltages arrive at the solder points when focus should be occuring.
Ive read that a resistance of around 25ohms should be seen across the two points but I am getting an open circuit. In fact testing this on another identical player I have, I do get a resistance reading around that value as expected.
Anything I have missed?
Would be interested to hear your views on the repairability of the module at this point
Thanks
If the focus motor coil is open circuit on a basic resistance test (and you say you have confirmed that by comparison with another) then unless you get lucky and can see the defect (and be able to repair it) then I'm afraid its looking like a scrapper.
🙁 that's not good then.
(you also have to wonder if there might be a fault that has maybe burned the coil out... something to consider if you try and fit a replacement)
(you also have to wonder if there might be a fault that has maybe burned the coil out... something to consider if you try and fit a replacement)
I fixed it 🙂 I decided to look at the focus coil under the microscope and saw that one of the connecting leaf springs wasn’t connecting, I carefully placed a little piece of solder to create a join and it now reads as expected. I’ll put it all back together this week, fingers crossed
