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| [#1] Troubleshooting:CLONE Ear 834P LOST LEFT CHANNEL Haha have fun to practice my basic trouble shooting skill by helping my neighbor fixing his clone EAr834p phono stage In short.. Left channel almost no sound... No tube issue... Reflow many solder joint.. Etc...  |
hahayanyan 正式會員49.xxx.xxx.49 |
2021-07-09 11:28 | |
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| [#2] Troubleshooting:CLONE Ear 834P LOST LEFT CHANNEL tube 1 Pin 1 having half of operating voltage Vs pin 6.... at no signal loading condition may be it is the issue............ what else can that be... ? Tube 2............ Pin and and Pin 6 seem to have the same issue.......... the transistor goers bad ?.......... but they seem to be ok..i measured it once.. the 2K...20K..200K resistor ? i should measure the voltga input to the 2K resistor..i suppose haha ..pre thx for having troubleshooting fun together..haha one of the reason i measure Pin1 and pin 6 .... as part of the starting pin.. because it is easy to access from the top........... haha without the need to take off the PCB and mount it upsdie down for more measurement.. haha, next i have to...  最後修改時間: 2021-07-09 11:47:28 |
hahayanyan 正式會員 49.xxx.xxx.49 |
2021-07-09 11:32 |
| [#3] Troubleshooting:CLONE Ear 834P LOST LEFT CHANNEL HV in both channels are shared with the same regulators. The 22uf cap right after the regulator should measure at around 230VDC (can't remember exactly as i built a breadboard with a PCB last year, but is disassembled now). Each tube is shared by both channels too. So, pins 1/6 voltages should be very similar. If they are very different, please check the voltage at each HV filtering caps. That's the 22uf caps, located after each voltage-drop resistors (namely 2k, 20k & 200k ohm). The measured voltages should be very similar among the 2 channels. 最後修改時間: 2021-07-09 12:05:48 |
bambino 正式會員 123.xxx.xxx.161 |
2021-07-09 12:02 |
| [#4] Troubleshooting:CLONE Ear 834P LOST LEFT CHANNEL #3 thxxxxxxxxxxxxxxxx the 2nd output fo the transformer is normal, and meaured at 110V AC the input voltage to the 2K resistor is very Low...at around 0.5V DC 第一直覺係我度錯咗嘢... Hahahaha seem not Possible for so low.. haha really cannot lazy...need to take off the PCB to ..................from the transistor..to 2k..20k..and 200K..that chain of resistor..and cap........ may be some dead diode haha which feed to the transistor the transistor is good  最後修改時間: 2021-07-09 12:22:30 |
hahayanyan 正式會員 49.xxx.xxx.49 |
2021-07-09 12:10 |
| [#5] Troubleshooting:CLONE Ear 834P LOST LEFT CHANNEL The 2k for each channel and one transistor for each channel . Feeding to V1 that chain of voltage dividing resistors.... the output of the 2K... should not be so low..haha  最後修改時間: 2021-07-09 12:26:34 |
hahayanyan 正式會員 49.xxx.xxx.49 |
2021-07-09 12:15 |
| [#6] Troubleshooting:CLONE Ear 834P LOST LEFT CHANNEL 今日下午去打第二劑疫苗 hhaa should not too aggressive.. Haha to take out the PCB.. Haha |
hahayanyan 正式會員 49.xxx.xxx.49 |
2021-07-09 12:37 |
| [#7] Troubleshooting:CLONE Ear 834P LOST LEFT CHANNEL you could start by measuring the HV output of PSU board, it should be 200-230VDC. the PCBs in your pics do not seem to be same as the ones i used, and so output voltage might be different. |
bambino 正式會員 123.xxx.xxx.161 |
2021-07-09 14:13 |
| [#8] Troubleshooting:CLONE Ear 834P LOST LEFT CHANNEL Thw high output from the 2ndary winding of the power tranformer is 110V Thx for the tips Thxx |
hahayanyan 正式會員 49.xxx.xxx.49 |
2021-07-09 14:21 |
| [#9] Troubleshooting:CLONE Ear 834P LOST LEFT CHANNEL sorry, i missed your point that output voltage of power trans is 110VAC. it's too low. Here's the power requirements for the PSU board...... Power supply requirement: Secondary voltage requirements AC230 ~ AC280v, greater than30mA, 6.3V greater than 2A. |
bambino 正式會員 123.xxx.xxx.161 |
2021-07-09 14:32 |
| [#10] Troubleshooting:CLONE Ear 834P LOST LEFT CHANNEL #9我就隨便猜猜.... #4說的110V，不是次級繞組兩端的交流電壓，而是繞組其中一端的對地電壓。 |
羅密歐 正式會員 182.xxx.xxx.78 |
2021-07-09 14:44 |
| [#11] Troubleshooting:CLONE Ear 834P LOST LEFT CHANNEL Thx thx rhx guys I am driving... Haha Shall listen and try later.. Haha |
hahayanyan 正式會員 49.xxx.xxx.24 |
2021-07-09 14:55 |
| [#12] Troubleshooting:CLONE Ear 834P LOST LEFT CHANNEL 瞓醒覺喇 after vaccin.. Hahaha 明天早上, later貓貓不 凡我的時候繼續 Haba |
hahayanyan 正式會員 49.xxx.xxx.188 |
2021-07-09 23:08 |
| [#13] Troubleshooting:CLONE Ear 834P LOST LEFT CHANNEL The secondary 0-110V feed to the HV section..to a 2W06 bridge rectifier .will step by step.. Test from this point tomorrow morning.. The 0-2Ov feed to low voltage section  最後修改時間: 2021-07-09 23:25:05 |
hahayanyan 正式會員 49.xxx.xxx.188 |
2021-07-09 23:18 |
| [#14] Troubleshooting:CLONE Ear 834P LOST LEFT CHANNEL #13 B電用倍壓整流？ |
羅密歐 正式會員 218.xxx.xxx.140 |
2021-07-09 23:26 |
| [#15] Troubleshooting:CLONE Ear 834P LOST LEFT CHANNEL #14 我相信... 至少要 gain of 2 to make it happen 我度嗰粒嘢冇壞嘅... 因為三隻腳喺版面我落到手 to measure.. Haha, 旁邊嗰兩粒電阻就係2k 亦都係喺#4 線路圖我用箭咀指住嗰粒嘢 唔知個電池, 和主體電路嘅關係係什麼  最後修改時間: 2021-07-09 23:39:24 |
hahayanyan 正式會員 49.xxx.xxx.188 |
2021-07-09 23:30 |
| [#16] Troubleshooting:CLONE Ear 834P LOST LEFT CHANNEL Haha 開工希望唔好 short things and make things worst..haha i read the circuit wrongly..it is the LOW voltage connected to the 2W06 but not HV first reading 2W06 bridge rectifier output at 35VDC.. seem normal haha  最後修改時間: 2021-07-10 10:44:32 |
hahayanyan 正式會員 49.xxx.xxx.237 |
2021-07-10 10:26 |
| [#17] Troubleshooting:CLONE Ear 834P LOST LEFT CHANNEL And this should be the one to 倍壓 真係一個幾好嘅練習....finding 連接點都要經驗嘅累積 Haha  最後修改時間: 2021-07-10 11:02:39 |
hahayanyan 正式會員 49.xxx.xxx.237 |
2021-07-10 10:48 |
| [#18] Troubleshooting:CLONE Ear 834P LOST LEFT CHANNEL haha and the given schematic by the maker ...is actAULLY...not that PCB too..haha look carefully...from the schematic ..AC250V feed to the Bridge rectifier but on the board..it is AC 28 VAC feed to the 2W06 有趣的事情.... 拆咗塊板出嚟度.. Tube 1, pin 1.. 185VDC Pin 6... Around 185 vdc too But 琴日未拆塊板出嚟度... Only 0.5Vdc 古怪..... HV 輸入端... 經過一啲電容 and diode, output from the diode is 289Vdc.. Strange omg.. similar but not 最後修改時間: 2021-07-10 11:29:51 |
hahayanyan 正式會員 49.xxx.xxx.237 |
2021-07-10 11:17 |
| [#19] Troubleshooting:CLONE Ear 834P LOST LEFT CHANNEL Strange... 拆咗塊板出嚟之後... Filament 冇點燈 真係好有呢件嘢畀我練習 troubleshooting tube 1 - Pin 4 the heater 1 : 8.2 VDC, Pin 5 Heater 2 0VDC... Haha 最後修改時間: 2021-07-10 11:54:28 |
hahayanyan 正式會員 49.xxx.xxx.237 |
2021-07-10 11:38 |
| [#20] Troubleshooting:CLONE Ear 834P LOST LEFT CHANNEL haha back to square one... learn things from basic ..step by step..... first understand the low voltage heater circuit... ON THAT PCB.. and i find this ....schematic whatever on that PCB their approach for voltage regulation ETC ...., are quite different to all given schematic from the maker..or the schematic i found online.. ...  最後修改時間: 2021-07-10 12:41:04 |
hahayanyan 正式會員 49.xxx.xxx.237 |
2021-07-10 12:40 |
