| Click here to select a new forum. |
| 7200/75 Sound problem |
Posted by: Geforce2187 on 2017-12-16 08:25:31
I just picked up a 7200/75, all of the sounds including the startup sound play at double speed- anyone know what could cause this? Motherboard/capacitors looks in good shape, everything is original except for RAM was upgraded from 8 MB to 16 MB
PRAM battery is currently still original
|
Posted by: Macdrone on 2017-12-16 23:43:53
those cap cans leak, at some point soon all the performas will need new caps, i would suggest a wash and dry then try and see if there is any change.
|
Posted by: Geforce2187 on 2017-12-24 14:51:37
I washed with distilled water and let dry, but still have the same issue. What exact type of capacitors would I need for this board?
I see three different types:
- f2 47u 16v
-d4 100u 6v
-10 16S 5B6
What does the first number mean? And the third type of capacitor is small one, and has different letters than the others?
|
Posted by: Geforce2187 on 2017-12-24 17:13:04
Also, wondering if the PSU has an issue and there's a wrong voltage- I don't have a multimeter right now and i'm not even sure what voltages are on what lines- the main connector looks like a regular ATX connector?
|
Posted by: Zippy Zapp on 2018-01-12 11:21:33
That sounds more like a faulty chip or logic or something on the board. Have you tried zapping PRAM?
I see three different types:
- f2 47u 16v
-d4 100u 6v
-10 16S 5B6
What does the first number mean? And the third type of capacitor is small one, and has different letters than the others? I would have to check my 7200/75 board to be sure but my *guess* would be the first 2 are codes for manufacturing or something like that. 16 volt 47uf and 6 volt 100uf as you probably figured out. The last one is different in that it is probably 16 volt (16S), 10uf (10). The 5B6 is probably a code. Again this is my guess based only on my experience replacing caps and I am a hack at best and far from an electronics guru. :wink:
|
Posted by: Geforce2187 on 2018-01-23 08:01:08
If its the sound chip is bad, are there any PCI sound cards that are compatible with early power macs/system 7? The current sound chip is a Crystal, not sure of the model number off the top of my head
|
| 1 |