冒牌恶魔请进,有问题请教,东西写得比较多，所以开了一个新贴，关于防烧的讨论！

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关于防烧芯片在5W 7W系列上的技术讨论
今天研究了一下国外对防烧得一些解释，希望能和各位有经验的***高手讨论一下。下面的资料主要来自modo官方网站
The tracking and focus coils are driven by a power driver IC (the infamous LA6508 on V9/V10 and what seems to be a custom part on the V12) which in turn is driven by the PS2 CD/DVD controller. The voltage swing on the coils can sometimes reach some very high values causing some high current to flow thru them and in the long run this can lead to a dead laser head and/or power driver.

On V9 machines a common solution (the "Romeo mod") was to disconnect the 12v power line used to drive tracking/focus and connect it to 5v, automagically limiting the voltage swing on the coils. On the V12 PS2s this is no longer possible and a different solution had to be found.


上面也就是说v12（也就是7W系列）的主板依然采用了v9/v10(也就是5W系列）的光头驱动IC,臭名昭著的LA6508,该IC的电压波动是导致烧机的元凶。
在V9/V10主机上通过把LA6508的12V接到5V上解决的这个问题，V12无法通过这个办法解决（也就是导致了防烧机芯片的出现）
下面是V9的解决方案

The Proposed Solution: "PSTWO-FIX"

Since the power driver IC is mainly a bunch of amplifiers with high current outputs, the output voltage is proportional to the input signal from the CD/DVD controller. By limiting the input signal to the power driver we can ensure that the voltage swing on the coils does not exceed a maximum value.
The input signal from the CD/DVD controller can be easily clipped to ~1.2v by using two very common 1N4148 diodes connected to ground as from the following schematics.

上面说的是V12的解决方案就是通过1N4148这个普通的二极管解决的问题。从图上看，效果还是不错的。
This fix can also be applied to V9/V10 machines as a replacement of the "Romeo Mod" if wanted. However this will not protect the laser from an LA breaking down and driving the coils with an higher than normal voltage, so for the old machines the power line reduction is probably still a safer solution.
Just for reference you can check the result of this fix on a V10 PS2 here:
这里说V12的这个防烧也可以用到v9/v10上，可以取代从前的那个把12v接到5v上的解决方案（这里我可能翻译的有些问题，最后一句话可能是说，老的办法更好。。呵呵）但是没有如何接到v9/v10的图纸呀，官方网站只有如何接到v12的图纸，哪位高手给分析一下电路看看，v9/v10应该怎么接？或者干脆按照老办法12v接5v？？？？？？？？
Because of the poor qulity of PSTWO laser len, after add modchip on your PSTWO, you would meet dead laser len problem without PSTWO FIX. So, you should add this PSTWO FIX with modchip together.

The PSTWO FIX using the 1N4148 work for most machines.
PSTWO FIX can protect your PS2 SCPH 750XX laser len and improve stability of the power supply of PS2 SCPH 750XX.


总之一句话，烧机的一切根源就是LA6508这个垃圾驱动IC,我原来以为sony在75系列上已经解决了这个问题，但是从modbo网站上看，只要是
使用LA6508驱动IC的无论什么型号都是有很大烧机危险的，都应该加防烧，也就是下面这个小东西



V8(也就是3W系列)以下由于没有采用LA6508，所以不需要安装防烧芯片
V9/V10(也就是5W系列）通常采用下图的方法解决




上面的中文是我通过网上查找资料得出的结论，英文是modbo官方的说明，我的问题是
1.v9/v10(也就是5W)防烧解决办法是不是最好就是把LA6508的12v接到5v上，还是安装那个1N4148，如果是，如何安装？官方只有v12的安装图.

hkghost

V9~V11所用的驅動雖是LA6508
但V12~V16所用的卻不是.

V9~V11還是改5V吧, 但這樣會造成讀盤性能下降

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谢谢楼上的。。。

冒牌恶魔

5W系列的主机就要装转接板的5815代用驱动，如图：



7W系列的主机就要装8个二极管的防烧，如图：




5W系列用的防烧和7W系列的不一样的。