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[#1] 請教唱盤轉速問題    
我在日本入咗部micro seiki bl77唱盤用咗100 v火牛,但轉速在33轉時變咗40 幾轉 45轉變咗50幾轉,想問各師兄問题出在什麼地方?

mingwan
個人訊息 會員
49.xxx.xxx.221
2020-08-28 08:51
[#2] 請教唱盤轉速問題    
問題在你未將那測速閃頻灯set在50Hz。
孟波
個人訊息 會員
14.xxx.xxx.15
2020-08-28 08:55
[#3] 請教唱盤轉速問題    
係咪 50hz 60hz 火牛問題?
dttmtong
個人訊息 會員
219.xxx.xxx.58
2020-08-28 08:55
[#4] 請教唱盤轉速問題    
先多謝師兄解答,我是用手機放在盤上測速的當33轉時顯示是40多轉,45轉時顯示是50多轉
mingwan
個人訊息 會員
49.xxx.xxx.221
2020-08-28 09:12
[#5] 請教唱盤轉速問題    
簡單,一係你手機唔準,一係你唱盤唔準,聲音聽起來又如何?
孟波
個人訊息 會員
14.xxx.xxx.15
2020-08-28 09:15
[#6] 請教唱盤轉速問題    
未聽,唱盤時用皮帶的我用一個外置馬達 測試速度 手機上的33及45測速是正常的
mingwan
個人訊息 會員
49.xxx.xxx.221
2020-08-28 09:21
[#7] 請教唱盤轉速問題    
想請問是否100 v火牛出問題?
mingwan
個人訊息 會員
49.xxx.xxx.221
2020-08-28 09:28
[#8] 請教唱盤轉速問題    
玩過有些盤要用吾同大細pulley

或pulley 有兩坑給 50/60 hz 用
phil.ng
個人訊息 會員
223.xxx.xxx.7
2020-08-28 11:51
[#9] 請教唱盤轉速問題    
BL77 does have +/- fine tuning for speed, normally it give +/- 6% etc

do u means - when u set +/- ,to "-" , it is still 40 at 33rpm

Check your 100V transformers , does it give u 110v but not 100 ?

for this turntable, does it use different pulley or slot for 50/60hz

do u have the service manual ? it may be trim pot at the circuit board for Speed tuning too



最後修改時間: 2020-08-28 11:55:48
hahayanyan
個人訊息 會員
49.xxx.xxx.134
2020-08-28 11:55
[#10] 請教唱盤轉速問題    
BL 51 要這樣搞

I'm also a Santa lover, so here is my take. Look at the Micro Seiki BL51 schematics on the VE site. You will see two resistors, R7 and R8. If I'm not mistaken, these are variable resistors and can be trimmed to adjust the speed. They usually look like a round bit of plastic (sometimes surrounded by a ring of metal) with either a slot or a cross that will accept a small screwdriver. They would be soldered to the circuit board and may even be labeled. Find R8 as this is the one for 33rpm. Put your pitch control in its center position and then rotate the resistor slowly with a small screwdriver. The speed should change up or down. Hopefully you can trim R8 enough to get 33rpm. You may also have to trim R7 as your 45 may also be out of spec.
phil.ng
個人訊息 會員
223.xxx.xxx.7
2020-08-28 12:07
[#11] 請教唱盤轉速問題    
BL 77 用大belt 丶是不是有 大細 pulley換
phil.ng
個人訊息 會員
223.xxx.xxx.7
2020-08-28 12:09
[#12] 請教唱盤轉速問題    
if it is 33 at 40rmp ,45 at 50rpm

if it is the VR at the circuit board, it is very likely the problem can be solved by tuning the fine tune and the trimpot

if it cannot be solved, first thing, clean the fine tune Pot and the VR pots at the circuit board and try

if everything u do..but not able to get the right speed

try and find a way for 90V input etc...

if u have try all of the above..., it will be an easy fix by changing some resistor or diodes etc.. or even transistor

good luck , it seem like it can be solved by the VR at the circuit board for that % of speed different


hahayanyan
個人訊息 會員
49.xxx.xxx.134
2020-08-28 12:15
[#13] 請教唱盤轉速問題    
多謝各位師兄嘅意見會逐個方法試下唔得再問,Thx
mingwan
個人訊息 會員
49.xxx.xxx.221
2020-08-28 18:25
[#14] 請教唱盤轉速問題    
Wish to hear your good news

hahayanyan
個人訊息 會員
45.xxx.xxx.152
2020-08-28 19:01
[#15] 請教唱盤轉速問題    
#1.我在日本入咗部micro seiki bl77唱盤用咗100 v火牛,但轉速在33轉時變咗40 幾轉 45轉變咗50幾轉,想問各師兄問题出在什麼地方?

>>>點解吾放張LP上唱盤直接聽聲,快慢一目了然。
CS168
個人訊息 會員
219.xxx.xxx.198
2020-08-28 23:52
[#16] 請教唱盤轉速問題    
因未有5針線所以未試,昨晚已在電路板上找到33及45的微調已把它調好,盤面上的微調也可從31調至36左右,多謝各師兄 有效的方法。Thx
mingwan
個人訊息 會員
49.xxx.xxx.74
2020-08-29 06:30
[#17] 請教唱盤轉速問題    
hahahaaha goood....
hahayanyan
個人訊息 會員
49.xxx.xxx.23
2020-08-30 13:19
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