Is this anything like the RF amp fitted in your machine?
After a fruitless search above deck for this I consulted the manual and discovered why. Its buried inside the laser slide and further buried in a shielded can, dire warnings of not under any circumstances operating the device with the cover removed due to high magnetic radiation present. I cannot therefore tell if it is the same but looking at the exploded diagram it would certainly appear to be the same.
If so I would suggest looking at and comparing Focs A1,2 B1,2 during focus search.
If I can figure out where the outputs of FOCS A1,A2,B1 and B2 arrive on the VSOP, it will make life easier and safer to take the readings you seek.
Have you tried looking for the S curve again as you now have a VSOP circuit that seems a near match to your's?
Hi John,
No I must admit I have not, I just assumed (perhaps wrongly) the sample point would still be TP1 and nothing would have changed. I will check and see if the S-curve sample point is different on the LV1000 circuit.
You may well be right but now you're getting a feel it's worth checking again. Remember the S curve is around half a second or so, scope on DC and watch for ascending then decending voltages on each focus cycle of the objective lens.
TP1 on the LD1100 is on the CONT board on the LDV1000 (my chassis) its on the VSOP board.
Unit powered on but before play is pressed
Now play pressed.
It immediately jumps to -12V, during the four focus attempt sequence it remains there, no fluctuation, then the sequence ends, it remains at this voltage until powered off. The S-curve is supposed to be 4Vp-p at a frequency of 500us. As you can see from the scope and the Metrix monitoring TP1, I get a big fat -12V
FOCS A1,B1,A2,B2 are sent from the RFAmp to the JCAB pcb then passed through both halves of Z501 which are configured as summing amps ((I think?) this is now hard work for the old grey matter now Chris ? ) to become FOCS A,B before going to the VSOP . As before check each if you can.
this is now hard work for the old grey matter now Chris ?
You're telling me, I'm so close to throwing in the towel on laserdisc players and writing it off as a venture too far, at present I'm three for nothing !
As if figuring out how to repair a laserdisc was not enough, this Pioneer does my head in, it appears to be a mish-mash of versions. For example, the model label on the back of the player states LD-1100, despite this it appears to have an LDV-1000 VSOP fitted. Now I'm trying to locate the JCAB (VWV 043) with Z501 by consulting the LDV1000 manual, so as to follow some tests recommended by John. However the JCAB I physically have in my player bears no resemblance to either one shown in the LDV1000 or LD-1100 manuals. It appears I have a split JCAB, one half is VWV 031 and the other VWV 035.?
I think there are likely numerous variants of this player, looking for service manuals on e-bay I've found at least three other service manuals for the LD1100. They all have the main model number LD-1100 but with supplement numbers such as VRT 004-0, VRT 037, VRT 013-0 and of course VRT 003-0.
I originally bought the VRT 003-0 and obtained the LV1000 manuals (both in the library, neither cover my JCAB), whats the betting its covered in one of the other manuals. There's nothing specific on the physical player that ties it to a code and at £30 a pop its not cheap to keep buying manuals on the off chance I get the correct version.
I thought N1500.N1700 VCR's were hard enough but I'd take on one of those any day over a laserdisc player. I think I've now hit a brick wall with this Pioneer.
I might as well go back to the Philips VLP600 at least that's a potential worker. Its semi-working in as much as it gives a picture albeit in constant fast run due to the laser slide running at a ridiculous speed.
