REPAIR GUIDE - Super CDROM2: Total capacitor replacement chart

[Raulie]

Does anyone know what happens when the RF shields aren't installed?

[schweaty]

i could be wrong about this and someone please correct me if i am, but i believe the bottom shield is part of the grounding for the system. 

[Ergot_Cholera]

I have the same issue of low, scratchy audio for the first few minutes of operation and then it gradually improves. I have replaced all the capacitors.
 I haven't tried any repairs yet but I would like to know what the resistor size and value are on the 14T board that need to be replaced (shown circled in red on image), I don't just want to jumper them as I'm sure this could lead to problems (they're there for a reason right?).
I already cleaned the board with alcohol when I repaced the caps, but I will try again and maybe see if that antithump thing is running at the correct voltage.

[choijimmy]

I have tried to using both 1. jumping wiring  2. Cleaning the pcb.

I use ultrasound cleaner to clean the PCB ( I don't have disk washer ), however, my ultrasound cleaner is Not big enough to put the whole PCB into in. I am only able to clean the part which around the 1000uf cap area. The result is pretty surprised,  I am able to get 70% of sound volume in first 5 mins compare to jumping wire method. After five minutes warming up, the PCB cleaned machine has same sound volume compare to jumping wiring one.

I believe if my ultrasound cleaner is big enough to clean the whole PCB, it will  solve the problem completely.

I don't see the point by replacing the resistors since the root cause is not those resistors. You should clean the PCB thoroughly( just clean the PCB by using alcohol  with cotton swab won't help because leaked cap fluid is all over the via holes ). If you are not comfortable by cleaning the PCB in disk washer, ultrasound cleaner, Jumping wire is you last resort. I have a mahine which jumping the wire for around 1 year and use pretty often, so far no issue yet.

[Ergot_Cholera]

I misunderstood the resisitors information as I just scanned over it.
Unfortunately I don't have access to a dishwasher or an ultrasonic cleaner, so I suppose I might have to reluctantly try the bridging method.
I suppose I could just use the AV socket of my Core Grafx instead of the Super CD-ROM². I only just learned that this could be done, which basically means that there is no need for an AV out on the Super CD-ROM² (unless you are using an original PCE maybe?).
I tested the voltage on the centre pin of the sound board (antithump?) and got 1.13v, so I know that this is probably the issue. So thoroughly cleaning around the 1000uf cap will help? The original cap did have some leakage when I removed it but I cleaned the whole are around the heatsinks with alcohol, but I guess this wasn't enough.

[Vimtoman]

I've had the same problem and cleaned and reworked with solder the power input circuit and this solved the problem.

But I do have a problem with the drive not reading cdr's where it was ok before.

There are two jumpers on the Super cd-rom2 called J1 and J2.
One is for the shielding problem and joins two sections of the Gnd.
The other is for the 5V that's may be missing from your Video out Din connector.

[pnauts]

Did someone have the schematic on the power supply from jack socket to 7805 input, from what I remind there is a power diode, then a PNP mosfet and NPN mosfet with some zener diodes.

[thesteve]

the shield is for noise supression only, will run fine with them removed

[Vimtoman]

Just done a total recap and now my drive is clicking and searching but not loading cd's.
I've checked all caps and they are the correct value.
Is there any caps that need to be a particular spec?

[thesteve]

the ground on the plate over the mech is required

[Vimtoman]

All shielding in,
It look like it was the missing cap mentioned at the beginning of the thread next to the Sony IC.
I had not put it in.
Popped a 100uf 16v in and it's reading disks now.
Still clicking more than normal though.

Any idea what the cap is connected to?

[ProfessorProfessorson]

All shielding in,
It look like it was the missing cap mentioned at the beginning of the thread next to the Sony IC.
I had not put it in.
Popped a 100uf 16v in and it's reading disks now.
Still clicking more than normal though.

Any idea what the cap is connected to?

If the laser eye is making cliking sounds as it seeks/reads, it may need to be calibrated, because it is not staying focused.

[Vimtoman]

What needs tweaking?

[thesteve]

i was thinking the CDR2 not the SCDR2, so on that the shields are less critical
the needed adjustment would be a guess at best without the unit handy, but focus level would be likely if the laser was replaced

[Vimtoman]

I've managed to adjust it so it's not clicking that often.
reads all disks now.
Not sure if I'm being over critical.