PowerBook 3400c quarz crystal overclocking

[MacUp72]

The Clock Chipping page refers to overclocking diverse vintage Macs with swapping the quarz crystals. About the PowerBook 3400/180Mhz Speedup it says:

''The PB3400c/180 has a 40MHz bus and a 4.5x multiplier to give the 180MHz machine. The 40MHz bus comes from a silver 40MHz crystal (two pins) located at Y1 on the top of the motherboard, with 40.00T5J on it. It is about 2 inches from the front and about an inch left of the battery bay. It is under the battery charging card; you pull the card and it is located about a half inch forwards from the connector. If you replace this crystal with a faster one, the bus, and thus the processor, speeds up.''

I have a non-funcional 3400/180 and will be getting another one next week or so, which I plan to overclock.
When I look at the actual board the location of this Y1 on top of the board, it doesnt seem correct because that crystal has a different marking( 0100T5J)





Y2 near the CPU area looks like this







Y3 near the battery bay looks like this, so I guess thats the correct one as it says 40,000 Mhz (?)



The marking nomenclatura for SMD crystals is like this:

 

[3lectr1cPPC]

Ooh, this would be good to know. I wonder how far you could push a 240MHz unit.

 

[chrisrueckert]

The link to "Clock Chipping page" doesn't seem to work. Can you repost it?

 

[MacUp72]

Clock Chipping

..no ideas about the three oscillators?

 

[MacUp72]

corrected the link..

so to sum it up, the description seems to mistake two oscillators Y1 instead of Y3, as the markings on it say otherwise(?)..
Y3 seems to be the 40 Mhz crystal, but Y1 has the 'T5J' marking part..confusing

 

[MacUp72]

the 3400c with 180 Mhz came in, it works, no corrosion on the board, price was ok for 70 bucks.
disassembled it, removed the pram battery and cleaned it..nice display.
I put in my IDE/CF adapter with 9.1/8.6 from the 1400c in, it booted but very slow and this combination doesnt wanna boot well with the CD drive inserted. Then I replaced the drive with a good, very silent Fujitsu 40 GB hdd it works much faster and almost inaudible, no probs with the CD.
..guess the 16 GB CF is getting old, I ordered one of those small IDE/SD-adapters now..but I'm actually satisfied with the IDE drive.




so, for the quarz crystal upgrade, I made a comparison with the three oscillators:

Y1

Y2

Y3

as the description says:
''The PB3400c/180 has a 40MHz bus and a 4.5x multiplier to give the 180MHz machine. The 40MHz bus comes from a silver 40MHz crystal (two pins) located at Y1 on the top of the motherboard, with 40.00T5J on it. It is about 2 inches from the front and about an inch left of the battery bay. It is under the battery charging card; you pull the card and it is located about a half inch forwards from the connector. If you replace this crystal with a faster one, the bus, and thus the processor, speeds up.''


So the only one with 40Mhz for the bus seems to be Y3, not Y1 since its the only one that reads 40.000M
it appears that the author just mistook the Y1 for Y3 because the location is right, its the one under the powerboard, not on top ( Y1).

any suggestions?

 

[MacUp72]

ok, got my crystals delivered for my 3400c..
I ordered 42, 48, 49,1 and a 50 mhz oscillators, the 42mhz one has a different case but wth..
desoldered the old 40mhz one, bent the legs of the new 42mhz one with a tweezer and soldered it in.

on boot system profiler didnt recognize it but under Gauge Pro it correctly shows up as expected, 4,5x 42Mhz= 189 Mhz
I'll use it now for some time ti let the cpu burn it a bit and then go on..

 

[MacUp72]

after some hours the 48mhz crystal is in, works, shows up as 216Mhz now.
did some quick benchmarks, there are some improvements..
I'll have to do some additional CPU cooling though, the cpu is getting hot at the touch now, maybe I find some small copper heat spreader..and do more testing.

 

[MacUp72]

got a cheap RAM upgrade card for the 3400 and I installed the tiny copper heatsink onto the CPU, it fits under the power board.




then a surprise, installed the RAM card and it read this, awesome ( was expecting a 64MB RAM card)