the BA chip and some other stuff

[Relayer]

I've yet to see any electronics spare parts outlet that sells the heat transferance pads here in Australia and I've delt with the more sophisticated suppliers and none have even heard of them.
Regards,
Relayer

[Relayer]

Here's some info on the BA5815FM IC:

*Description
The BA5815FM is a Power Driver IC for 5-channel CD and DVD players. Two channels incorporate filters and can connect PWM input directly. The additional two channels incorporate a standard operational amplifier. It can reduce the external components greatly. In the loading driver, output voltage can be adjusted to each device.

*Features
(1) 4-channel BTL driver and 1-channel reversable driver
(2) 2 channels are PWM input direct coupled type
(Built-in primary filter)
(3) 2 channels have standard operational amplifiers
(4) The device can be miniaturized due to the adoption of
HSOP-M28 power package
(5) Built-in thermal shut down circuit
(6) Wide dynamic range (9.2V (typ.) at Vcc=12V, RL=8ohms)

*Applications
DVD, CD players

There's some trivia for you.
Regards,
Relayer

P.S. I've yet to find some info on the other BA chip.

[bluevapor]

well i've managed to get hold of those heat pads and screws from a shop here. gonna try it out later. will keep u guys updated. hopefully this will solve my multi disc prob;lesm

[bluevapor]

by the wires, would too thin a wire used have any problems playin multi-disc games on the messiah2? are my wires too thin?

[boogieman_ps2]

The BA6664FM is a 3-phase motor controller.
Used to control the PS2 disk spindle motor, manfu. is Rohm and datasheets are available for both BA devices.

[Games4Hire]

What symptoms would you experience if either of those chips were faulty?

[Relayer]

I searched Rhoms web site a while back but couldn't get any info in the BA6664FM, I could only get the data sheet for the other. I must have another look I guess. Thanks for that boogieman_ps2.
Regards,
Relayer

[boogieman_ps2]

I seen the 6664 datasheet on chipdocs but they require you to register/pay for access to the site - I did'nt bother, but I should be able to get the datasheets at work.
Rohm appear to have moved onto the 6665 I'm not sure how compatible the two devices are until I see the 6664 datasheet.

[Games4Hire]

Does anyone know if there is a way to test the chip?

[E Zee]

A way to check if the BA5815 chip has gone is to look on top of the chip and find the dimple on top of it, that dimple denotes that pin on the chip is pin 1 and so count till you get to pin 8 on the chip (it will be the 1 after the long flat heatsink pin) which is linked directly to the fuse (PS11).

Being that fuses protect the live side of things on the board this pin shouldnt be earthing to ground so take a multimeter select the 'continuity' reading on it and place one of the probes on pin 8 and the other to ground on the board, if the meter shows continuity or beeps meaning continuity then the chip has shorted.

You can purchase a new BA5815 chip but the BA6664FM are much harder to find.

This was a previous post from the PS2Meister,helped me!
Cheers
E Zee.