laisla 发表于 2014-9-26 12:50:04

garfield 发表于 2014-9-26 13:29:52

6551感觉比6581的板子稍微人性化些...6551的板子上，三极管二极管都标明引脚，这样贴片一眼就能看出来是二极管还是三极管。6581就没有

ebl21 发表于 2014-9-26 14:14:10

garfield 发表于 2014-9-26 13:29
6551感觉比6581的板子稍微人性化些...6551的板子上，三极管二极管都标明引脚，这样贴片一眼就能看出来是二 ...

如果硬件问题可以通过对比测量大概判断。

bg4cp 发表于 2014-9-28 20:27:46

laisla 发表于 2014-9-26 12:50
等以后我做产品，直接把lm399的塑料盖子撬掉，留一个四脚的金封在那，看他们怎么修。90%的修理工都会觉得这 ...

楼主，你就笑死我吧

bg4cp 发表于 2014-9-28 20:28:38

我怀疑你的6551和内存相关一块硬件有问题，不是简单的软件问题

garfield 发表于 2014-9-28 20:38:44

谢谢楼上的诸位坛友！谢谢！

ebl21 发表于 2014-9-28 20:52:28

garfield 发表于 2014-9-28 20:38
谢谢楼上的诸位坛友！谢谢！

我今天换了TC5564还是不行，后来反复短接39和40脚可以跳过去，但是所有档位都是OL。重新开机又是ERRCA。

中国之声 发表于 2014-12-30 11:13:30

楼主,求手册,76967857@qq.com感谢.

quentincumber 发表于 2015-2-28 11:06:13

R6551 Err CA fix:

1. Replace backup battery and surface mount electrolytics
2. Press rear CAL switch
3. PressSHIFT and V DC buttons and then power on
4. Recalibrate R6551

garfield 发表于 2015-2-28 13:44:07

quentincumber 发表于 2015-2-28 11:06
R6551 Err CA fix:

1. Replace backup battery and surface mount electrolytics


谢谢.......但是我的机器，现在不是显示ERRCA，而是不能正确测量.....

quentincumber 发表于 2015-2-28 16:09:06

Sorry if I have misunderstood. I'm afraid I do not speak Chinese.

Let me give some more information in case it is useful. If it isn't please ignore.

Two copies of R6551 calibration data is stored in TC5564 at 0x7413-0x755C and 0x7567-0x76B0.
The first byte of each block 0x7413 and 0x7567 are checksums. On power up, both checksums are verified and if both are incorrect then ERR CA is displayed and the machine freezes.

When you apply power to the TC5564 it will contain random data. Each checksum will be correct 1 time in 256. So about 1 in 100 times one checksum will be correct and ERR CA will not be displayed. But the calibration data is still random. Because of this the R6551 will probably display OL and not allow calibration, even if there is no hardware error.

If you power up with CAL switch in and V DC and SHIFT pressed then both blocks of calibration data are copied from the 27C256 ROM, and the meter can now make readings and be calibrated.

garfield 发表于 2015-3-1 07:17:34

Thank you very much for your information!I will try it on Monday ,God bless me that the meter have no hardware error!Thank you!

garfield 发表于 2015-3-4 16:12:57

quentincumber 发表于 2015-2-28 16:09
Sorry if I have misunderstood. I'm afraid I do not speak Chinese.

Let me give some more informati ...

Thank you very much for your help!!! My 6551 works OK now......... Thank you!!!!!

shengmg 发表于 2015-5-13 01:05:08

LZ的6551好了？也不说说怎么修的？这将是这帖子的精华所在。

garfield 发表于 2015-5-13 09:18:24

shengmg 发表于 2015-5-13 01:05
LZ的6551好了？也不说说怎么修的？这将是这帖子的精华所在。

If you power up with CAL switch in and V DC and SHIFT pressed

就是按照41楼的说法，这样开机的啊？然后就正常了啊？

tx3851 发表于 2017-8-23 22:38:02

学习了
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