Yamaha HTR-2067 repair - Page 1
Forum section: electronics / repair

author: ubis
author_rank: Newbie
timestamp: November 17, 2017, 12:22:37 pm
content: Hello,I'm trying to repair Yamaha HTR-2067 receiver. It doesn't turn on, no clicks, nothing.Now looking at standby power supply schematicThere's nothing onPWR_RYwhen power button is pressed.Also I've checkedS9,ACDETvoltages, and both seems to be higher than it's written on schematic.S9is about 14V andACDETis about 9V.However, looking further:There's nowhere elseS9is connected, just to an 3.3V regulator. Which makes stable 3.3V voltage for microprocessor(I've checked with scope).Power button is working fine, traced back to the microprocessor. I've also manually connected relayRY151from 5V power supply and relay works just fine.I've also tested output of thermal sensorIC134LM19, which output is about 1.75V, so temp is not triggering this.I'm not sure where to look now... One important thing - main power supply caps looks wierd to me, their vents are kinda bloated. Gonna take them out and check ESR.Full service manual -https://ufile.io/saae8Edit:Problem was that microcontroller detected low ac voltage multiple times.I've managed to get into diagnostic menu, which resets the mcu and now receiver works just fine.It seems like on these Yamaha's when protection system is activated 3 times in a row, it won't power on anymore, unless in diagnostic mode.

author: pae25
author_rank: Newbie
timestamp: June 03, 2019, 09:06:35 pm
content: Hey! - Can you let me know how to get into diagnosis mode?Thank you!

author: Chris56000
author_rank: Frequent Contributor
timestamp: June 05, 2019, 12:39:49 pm
content: Hi!It's all explained and covered in the HTR–2067 Service Manual which you can get free of charge from Elektrotanya!(Original Factory PDF with coloured highlighting on power rails of schematics!)Press the "Tone Control" and "Info" buttons together and hold them in whilst you switch the main power switch on.If you've got a fault code present, it will be displayed as a "P" code in the front display!Chris Williams

author: mzacharias
author_rank: Frequent Contributor
timestamp: June 05, 2019, 02:39:43 pm
content: Quote from: Chris56000 on June 05, 2019, 12:39:49 pmIn the event of a high-current shut-down, the above procedure will produce only a "click" as the relay cycles once. One would then need to resolve the short circuit. Blown channel, shorted bridge rectifier or main filter cap, etc. Yamaha protection circuits of recent years are so fast the display never comes up. Once the over-current protect has been engaged the receiver will do nothing, except flash the Standby LED when you press the Standby/On button.I did warranty work for Yamaha for over 20 years.

author: basil
author_rank: Newbie
timestamp: March 25, 2020, 07:12:30 am
content: Hi ,Initially the unit was showing error PS PRT 111L ,as per the service manual [Yamaha HTR 2067] checked the main PCB for a faulty transistor in Main amp board . Now moved to OPE3 .OPE3 PCB shows some wearied dc voltages at the output .* S9 46.9 VDC when measure with respect to MGND .*PWR RY 0Vdc*ACDET 34.3 VDC*AC input 249 VAC*AC output on the sub transformer 18.8 - 0 -18.8 Vac

author: mzacharias
author_rank: Frequent Contributor
timestamp: March 27, 2020, 02:46:15 am
content: Quote from: basil on March 25, 2020, 07:12:30 amAre you referring to some other model?This makes no sense regarding an RX-V2067.

author: basil
author_rank: Newbie
timestamp: March 28, 2020, 04:12:53 am
content: Hi ,No , its HTR 2067 only .could you review the OPE3 (same as the one givn above ) circuit and let me know is there a small chance to happen like this ?

author: mzacharias
author_rank: Frequent Contributor
timestamp: April 01, 2020, 05:20:06 pm
content: Quote from: basil on March 28, 2020, 04:12:53 amI apologize - I was looking at the RX-V2067, not the HTR model which is completely different.However, your voltage readings make absolutely no sense.Your reading for S9 cannot, repeat, CAN.NOT. be 46.9 volts with respect to a good chassis ground. (milli-volts perhaps?)I would suggest re-checking that you have a correct ground reference, or checking that chassis ground is actually chassis ground - some connection to chassis not being made by the circuit board or other connection.For example - if the rear panel screws are removed you will have no ground reference and errors will occur just for that reason.