- #26 [cody2k], 22-11-27 17:50
- #25 [羅密歐], 22-11-27 17:37#22 你分析的因果關係錯了,聚焦看第三頁的block diagram吧。若看不懂的話,再搞下去也是浪費時間的。
- #24 [cody2k], 22-11-27 17:23#18.
原來羅師傅都維修過這機! -
- #23 [cody2k], 22-11-27 16:58圖2...
- #22 [cody2k], 22-11-27 16:56#18, thanks bro Romeo again.
Already downloaded and check it out...
TA7318P pin 2,8 output pass to 4558, then 4558 output to drive VU meter.
請問羅密歐師傅 Q604作用是否 provide signal to turn on green light from red light?
其實呢 part 我睇得唔通透. - #21 [hahayanyan], 22-11-27 16:12羅密歐 master
thx thx i have some answers from page 1 and page 6 from that spec sheet
and it is a good spec sheet, it basically an easy to follow on how to adapt this wide range meter driver
haha always learn to find out myself before ask... good coaching
thx
最後修改時間: 2022-11-27 16:16:39 - #20 [羅密歐], 22-11-27 15:52網上下載TA7318P的spec sheet看看吧, 你想要的答案都在裏面。
- #19 [hahayanyan], 22-11-27 14:34#18
羅密歐 master
for 1) just use a simple Square wave? if the VU jump...then it should be ok ?
do i need to worry anything about if i set my square wave frequency a little bit low? if i set it 2 hz , so i may kind of know or judge..the response of the VU too..haha
day day learn learn..so nice
thx
haha
最後修改時間: 2022-11-27 14:38:45 - #18 [羅密歐], 22-11-27 11:441. 要知道TA7318P是否工作正常,直接在它的兩個輸入端,用signal generator輸入訊號,看VU錶動作是否正常便知。
2. 假設TA7318P真的壞了,會對你曾在#1中提到,紅燈不能轉綠燈,有所影響嗎?它們互成因果關係嗎? - #17 [cody2k], 22-11-27 11:14思考了幾個鐘,暫時維修方向係粒TA7318P(Q603)有問題,因為TA7318P係VU meter controler, 推動唔到VU錶頭直接理解係 controler not working, so 今朝去咗淘寶訂一粒,試試換上後情況如何。
最後修改時間: 2022-11-27 11:15:33 - #16 [cody2k], 22-11-26 12:38Q603...
- #15 [cody2k], 22-11-26 12:34control board...
- #14 [cody2k], 22-11-26 12:25剛剛度過晒了,基本上全部test result都跟圖示非常接近,誤差最多只係 0.2v~0.5v.
唯一不同是Q603(TA7318P),腳3輸出沒有 1.18v, 只係開機時“發”了一下就回歸0.
暫時無頭緒邊到壞。
最後修改時間: 2022-11-26 12:39:51 - #13 [cody2k], 22-11-25 17:39#12. Thanks bro.
明早會詳細check埋VU meter 推動晶體管。
最後修改時間: 2022-11-25 17:40:06 - #12 [audiofans], 22-11-25 17:23R785 和附近的電阻電感電容,應該係高頻起震自激既保護電路,R785會燒毀是因為輸出有大電流高頻震盪,VU meter零件亦有可能因為這些大電流高頻而燒毀不工作!
- #11 [cody2k], 22-11-25 16:43#10. Thanks bro.
都有可能, 始終唔知上手點玩.
明天會詳細度度電壓, 度完會更清楚.
最後修改時間: 2022-11-25 16:43:44 - #10 [kx14cp1], 22-11-25 16:30R785可能係長時間無駁喇叭,大輸出之下谷死。唔轉燈同METER唔郁,先檢查果part供電,線路圖上有參考電壓,跟住度差太多的話就應該附近有問題。
- #9 [cody2k], 22-11-25 15:54R429位置...
- #8 [cody2k], 22-11-25 15:53另外發現 R429 有燶燶地現象, 用 meter 度過阻值無問題, 但都會下次換過粒.
- #7 [cody2k], 22-11-25 15:50#6....thanks bro reply.
#1...will check it tomorrow.
#2. already replaced a new one. The old old confirmed burned.
JC408 also re-solder. - 下一頁 (1 of 2)
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copied.
I'll track again.