MacUp72
Well-known member
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)
![y1.jpeg y1.jpeg](https://forumbucket.us-southeast-1.linodeobjects.com/data/attachments/60/60754-42dea34aaffb39d3cef3736e3f1d3b89.jpg)
Y2 near the CPU area looks like this
![y2.jpg y2.jpg](https://forumbucket.us-southeast-1.linodeobjects.com/data/attachments/60/60755-af601e9f476d6242743cf81341e141a7.jpg)
Y3 near the battery bay looks like this, so I guess thats the correct one as it says 40,000 Mhz (?)
![y3.jpg y3.jpg](https://forumbucket.us-southeast-1.linodeobjects.com/data/attachments/60/60756-e422b0097ab0349675166f37bbba5aa1.jpg)
The marking nomenclatura for SMD crystals is like this:
![Bildschirmfoto 2023-08-15 um 09.46.18.jpg Bildschirmfoto 2023-08-15 um 09.46.18.jpg](https://forumbucket.us-southeast-1.linodeobjects.com/data/attachments/60/60757-59629fe5e6156c6f3d8aa80157cab7d4.jpg)
''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)
![b2 klein.jpeg b2 klein.jpeg](https://forumbucket.us-southeast-1.linodeobjects.com/data/attachments/60/60758-a9c56900413ff35a50dd53fd91a1608e.jpg)
![y1.jpeg y1.jpeg](https://forumbucket.us-southeast-1.linodeobjects.com/data/attachments/60/60754-42dea34aaffb39d3cef3736e3f1d3b89.jpg)
Y2 near the CPU area looks like this
![y2.jpg y2.jpg](https://forumbucket.us-southeast-1.linodeobjects.com/data/attachments/60/60755-af601e9f476d6242743cf81341e141a7.jpg)
Y3 near the battery bay looks like this, so I guess thats the correct one as it says 40,000 Mhz (?)
![y3.jpg y3.jpg](https://forumbucket.us-southeast-1.linodeobjects.com/data/attachments/60/60756-e422b0097ab0349675166f37bbba5aa1.jpg)
The marking nomenclatura for SMD crystals is like this:
![Bildschirmfoto 2023-08-15 um 09.46.18.jpg Bildschirmfoto 2023-08-15 um 09.46.18.jpg](https://forumbucket.us-southeast-1.linodeobjects.com/data/attachments/60/60757-59629fe5e6156c6f3d8aa80157cab7d4.jpg)
Last edited: