I'm working on a dead Wadia 21 and I am betting that the laser is dead but how do I tell for sure?? I have read many post's about the Teac servo boards having problems.
Symptoms, Insert cd, sled traverses towards spindle, tries to focus 3 times then sled moves to end of travel away from spindle. disc never spins.
I used my cell phone camera to look at the lens while the laser is trying to focus and weakly i can see that the laser is in fact turning on and off.
I have verified that all supplies are working and that the proper PSU voltages are present at each IC.
The spindle motor works when an external voltage is applied. I have traced through the TEAC VRDS T1 schematic (which is very very close to the TEAC board in the 21) and no spindle signal is sent to the spindle motor controller from the Sony CXD2500 IC. But it appears to brake if you spin the disc by hand and open the tray. So I am assuming the motor control circuity is ok.
I see no RF coming out of the laser transport board. I am assuming it would only be seen if the disc was playing.
So the question is how do I determine if in fact the laser is just so dead it can't see the disc??
Zc
Symptoms, Insert cd, sled traverses towards spindle, tries to focus 3 times then sled moves to end of travel away from spindle. disc never spins.
I used my cell phone camera to look at the lens while the laser is trying to focus and weakly i can see that the laser is in fact turning on and off.
I have verified that all supplies are working and that the proper PSU voltages are present at each IC.
The spindle motor works when an external voltage is applied. I have traced through the TEAC VRDS T1 schematic (which is very very close to the TEAC board in the 21) and no spindle signal is sent to the spindle motor controller from the Sony CXD2500 IC. But it appears to brake if you spin the disc by hand and open the tray. So I am assuming the motor control circuity is ok.
I see no RF coming out of the laser transport board. I am assuming it would only be seen if the disc was playing.
So the question is how do I determine if in fact the laser is just so dead it can't see the disc??
Zc
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