NEC6x光驱开始打磨了

david0jy

是2510的53脚，看错了

Saxophone

记得转贴哦。
我们都等着学习学习呢。[em02]

lm3886

墨西哥跳豆

以下是引用lm3886在2005-5-17 19:49:00的发言：
电路图太大传不上，传张局部的<img src="attachments/dvbbs/2005-5/2005517194738106.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/2005-5/2005517194738106.jpg\');}" onmousewheel="return imgzoom(this);" alt="" />
我把红圈内的电路去了，在74u04第8脚接了本坛晶振不成功啊[em12][em12]




yzsazft@yahoo.com.cn

Saxophone

昨晚和今早搞了搞电路板。驱动IC是坏了，但没有完全坏，处理了一下脚位可以勉强工作了。放CD时还比较正常，但还是通不过上机数据测试。而且发热比较以前大了，读盘的能力也明显差了。郁闷，不过还好，现在起码勉强还可以把晶振和时钟部分的试验完成。[em02]

十分感谢吻子兄，再次感谢david0jy兄对我的有益建议。明晚考完英文后我会尽快完成数字部分的改造，给大老板吻子兄和各位一份数字改造报告的。[em11]

吻子

好孩子啊。。。

[em11][em09][em09]

等待你的报告

好的话我给奖品加分
再好的话有MM。。。。。[em09]

csszss

期盼......

Saxophone

为试验做的炮灰
<img src="attachments/dvbbs/2005-5/2005525172724302.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/2005-5/2005525172724302.jpg\');}" onmousewheel="return imgzoom(this);" alt="" />

Saxophone

找到CXD2510Q的60脚，发现有通到反面，于是直接接到反面的焊点上了。绿色是SPDIF，黄色是VCC，黑色是GND。
<img src="attachments/dvbbs/2005-5/200552517304623.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/2005-5/200552517304623.jpg\');}" onmousewheel="return imgzoom(this);" alt="" />

Saxophone

<img src="attachments/dvbbs/2005-5/2005525173116973.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/2005-5/2005525173116973.jpg\');}" onmousewheel="return imgzoom(this);" alt="" />

Saxophone

<img src="attachments/dvbbs/2005-5/2005525173047508.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/2005-5/2005525173047508.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="" />

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

<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

<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

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]

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

只是接回原来DSP的数字输出。

csszss

第68楼不是光纤和同轴输出SPDIF吗?