NEC6x光驱开始打磨了

Saxophone

把光驱拆开后就开始清理光驱内部，电路板上有不少的灰尘。光驱机械部分还算干净，布、刷子、皮老虎轮番上阵。大半个小时后，光驱里外都干干净净的了。装回机械部分的时候顺便把驱动电机的IC上加上了退偶电容和贴上铜箔。
<img src="attachments/dvbbs/2005-5/2005513212328315.jpg" border="0" onload="if(this.width>screen.width*0.7) {this.resized=true; this.width=screen.width*0.7; this.alt=\'Click here to open new window\nCTRL+Mouse wheel to zoom in/out\';}" onmouseover="if(this.width>screen.width*0.7) {this.resized=true; this.width=screen.width*0.7; this.style.cursor=\'hand\'; this.alt=\'Click here to open new window\nCTRL+Mouse wheel to zoom in/out\';}" onclick="if(!this.resized) {return true;} else {window.open(\'attachments/dvbbs/2005-5/2005513212328315.jpg\');}" onmousewheel="return imgzoom(this);" alt="" />

有点累了，明天再搞吧。[em11]

lm3886

Saxophone

<img src="attachments/dvbbs/2005-5/2005513211743341.jpg" border="0" onload="if(this.width>screen.width*0.7) {this.resized=true; this.width=screen.width*0.7; this.alt=\'Click here to open new window\nCTRL+Mouse wheel to zoom in/out\';}" onmouseover="if(this.width>screen.width*0.7) {this.resized=true; this.width=screen.width*0.7; this.style.cursor=\'hand\'; this.alt=\'Click here to open new window\nCTRL+Mouse wheel to zoom in/out\';}" onclick="if(!this.resized) {return true;} else {window.open(\'attachments/dvbbs/2005-5/2005513211743341.jpg\');}" onmousewheel="return imgzoom(this);" alt="" />

Saxophone

<img src="attachments/dvbbs/2005-5/200551321175834.jpg" border="0" onload="if(this.width>screen.width*0.7) {this.resized=true; this.width=screen.width*0.7; this.alt=\'Click here to open new window\nCTRL+Mouse wheel to zoom in/out\';}" onmouseover="if(this.width>screen.width*0.7) {this.resized=true; this.width=screen.width*0.7; this.style.cursor=\'hand\'; this.alt=\'Click here to open new window\nCTRL+Mouse wheel to zoom in/out\';}" onclick="if(!this.resized) {return true;} else {window.open(\'attachments/dvbbs/2005-5/200551321175834.jpg\');}" onmousewheel="return imgzoom(this);" alt="" />

Saxophone

<img src="attachments/dvbbs/2005-5/2005513211621140.jpg" border="0" onload="if(this.width>screen.width*0.7) {this.resized=true; this.width=screen.width*0.7; this.alt=\'Click here to open new window\nCTRL+Mouse wheel to zoom in/out\';}" onmouseover="if(this.width>screen.width*0.7) {this.resized=true; this.width=screen.width*0.7; this.style.cursor=\'hand\'; this.alt=\'Click here to open new window\nCTRL+Mouse wheel to zoom in/out\';}" onclick="if(!this.resized) {return true;} else {window.open(\'attachments/dvbbs/2005-5/2005513211621140.jpg\');}" onmousewheel="return imgzoom(this);" alt="" />

Saxophone

刚买回来当然就是上电试一下读CD了，还可以。
试完CD就开始上计算机做一下读盘测试了，全盘拷贝了两张盘，一张正版的数据盘，一张四合一刻录盘。一共约3猪数据。用了约一个半小时。这光驱的体质还可以，这时刚好见吻子兄发的CD镇的贴子，不问三七二十一，先定下两个再说。这小子还有点福气。[em11]

lemene

给个数字输出的线路图好吗？

lm3886

DAC＋运方耳机部分也最好废了。显示部分最好也独立结5V
起码得费7，8个集成块哦
越搞越觉得这机子烂[em01]

Saxophone

大家有机会交流交流，还怕玩不好。[em11]

csszss

您的经验对我们太重要了!

Saxophone

没有对原来数字信号作改变的。

csszss

第68楼不是光纤和同轴输出SPDIF吗?

Saxophone

只是接回原来DSP的数字输出。

csszss

多谢Saxophone提供的经验！向您的光驱致敬.
改造SPDIF后,SPDIF输出正常吗?

Saxophone

我认为，33.8经74HC00并不是网上有些朋友所说的二分频得出16.9，而是和50.8合成得出16.9。所以我认为只是替换33.8不是最好的方法。本来我还打算把33.8用D触发器二分频后直接输出到CXD2510Q的53脚，这样好处是：一、可以使DSP时钟精度不受50.8晶振的精度影响，尽管DSP时钟精度主要由33.8晶振精度决定，但精度高一点还是好的；二、把33.8晶振作二分频后可以把原来晶振精度提高。
而数字部分还可以用二分频后的16.9和CXD2510Q的数字输出作Re-Clock整形，以降低波形的失真。

自从光驱板子的驱动IC出问题后，我的改造试验就一直不太顺利。本想把所有的试验完成后再写出来的。但是，我的光驱板子支持不到我完成我上面说的这些了。我正准备作二分频试验时，光驱连CD都放不了。

当我上HIFIDIY时正好看到帖子又顶了上来，于是就。。。

我完成的的部分应该可以说是大部分了，剩下的部分，如果有兴趣的朋友们可以试一下，不过效果我不能保证，对硬件是否有损害我也不能肯定，我的看法是否有错我也不写包单。反正各位小心小心再小心就是了，GOOD LUCK EVERYONE！[em11]

Saxophone

<img src="attachments/dvbbs/2005-5/200552517411113.jpg" border="0" onload="if(this.width>screen.width*0.7) {this.resized=true; this.width=screen.width*0.7; this.alt=\'Click here to open new window\nCTRL+Mouse wheel to zoom in/out\';}" onmouseover="if(this.width>screen.width*0.7) {this.resized=true; this.width=screen.width*0.7; this.style.cursor=\'hand\'; this.alt=\'Click here to open new window\nCTRL+Mouse wheel to zoom in/out\';}" onclick="if(!this.resized) {return true;} else {window.open(\'attachments/dvbbs/2005-5/200552517411113.jpg\');}" onmousewheel="return imgzoom(this);" alt="" />

Saxophone

<img src="attachments/dvbbs/2005-5/2005525174027589.jpg" border="0" onload="if(this.width>screen.width*0.7) {this.resized=true; this.width=screen.width*0.7; this.alt=\'Click here to open new window\nCTRL+Mouse wheel to zoom in/out\';}" onmouseover="if(this.width>screen.width*0.7) {this.resized=true; this.width=screen.width*0.7; this.style.cursor=\'hand\'; this.alt=\'Click here to open new window\nCTRL+Mouse wheel to zoom in/out\';}" onclick="if(!this.resized) {return true;} else {window.open(\'attachments/dvbbs/2005-5/2005525174027589.jpg\');}" onmousewheel="return imgzoom(this);" alt="" />

Saxophone

<img src="attachments/dvbbs/2005-5/2005525173715445.jpg" border="0" onload="if(this.width>screen.width*0.7) {this.resized=true; this.width=screen.width*0.7; this.alt=\'Click here to open new window\nCTRL+Mouse wheel to zoom in/out\';}" onmouseover="if(this.width>screen.width*0.7) {this.resized=true; this.width=screen.width*0.7; this.style.cursor=\'hand\'; this.alt=\'Click here to open new window\nCTRL+Mouse wheel to zoom in/out\';}" onclick="if(!this.resized) {return true;} else {window.open(\'attachments/dvbbs/2005-5/2005525173715445.jpg\');}" onmousewheel="return imgzoom(this);" alt="" />

说明
从光驱电源的12V处引电到晶振板的“你吃康”的正负脚，把晶振板的输出正板接到74HC04的9脚，晶振板的负极接到74HC04的GND，也就是7脚

Saxophone

晶振板
<img src="attachments/dvbbs/2005-5/2005525173648876.jpg" border="0" onload="if(this.width>screen.width*0.7) {this.resized=true; this.width=screen.width*0.7; this.alt=\'Click here to open new window\nCTRL+Mouse wheel to zoom in/out\';}" onmouseover="if(this.width>screen.width*0.7) {this.resized=true; this.width=screen.width*0.7; this.style.cursor=\'hand\'; this.alt=\'Click here to open new window\nCTRL+Mouse wheel to zoom in/out\';}" onclick="if(!this.resized) {return true;} else {window.open(\'attachments/dvbbs/2005-5/2005525173648876.jpg\');}" onmousewheel="return imgzoom(this);" alt="" />

Saxophone

接着是时钟部分。
在这我简单说明一下，按我个人理解：NEC6x的DSP时钟是由50.8和33.8两个晶振共同输出的。其中50.8经74HC04缓冲后输入74HC00，33.8经74HC04缓冲再作反相，然后才输入74HC00，在74HC00内合成为16.9提供给CXD2510Q的53脚的。
于时我先是把74HC04的10脚和9脚断开
<img src="attachments/dvbbs/2005-5/200552517368532.jpg" border="0" onload="if(this.width>screen.width*0.7) {this.resized=true; this.width=screen.width*0.7; this.alt=\'Click here to open new window\nCTRL+Mouse wheel to zoom in/out\';}" onmouseover="if(this.width>screen.width*0.7) {this.resized=true; this.width=screen.width*0.7; this.style.cursor=\'hand\'; this.alt=\'Click here to open new window\nCTRL+Mouse wheel to zoom in/out\';}" onclick="if(!this.resized) {return true;} else {window.open(\'attachments/dvbbs/2005-5/200552517368532.jpg\');}" onmousewheel="return imgzoom(this);" alt="" />