• The move to the new server is done. There are some software and database maintenance updates in process. This has us passing the hat around to help out. We appreciate any donations. Seriously, even a dollar helps. The payment page may be found here - https://www.audiokarma.org/support.html

Marantz 1040

JRM said:
My read up taught to test for DC voltage on speaker terminals.
Click to expand...
If your protect relay " clicks" then you can check DC offset at the speaker terminals. Bias or idle current checking and adjusting -- there is usually a test procedure in the service manual that indicates these test points.

Offset and bias are two totally different entities.
 
Hey bud. Welcome back. Missed your input here. :thumbsup:. I have the service manual so I'll spend a little study time. Will check in after the read before I try anything to be sure. You guys rock.

Thank you, thank you, thank you for all the help so far. :bowdown:
 
Would I hear the relay click when I power the amplifier up.

And I'm guessing this should happen when connected through dim bulb tester?
 
Connect your DMM between J709+ and J711- and adjust trimming resistor R763 for 20mv DC repeat at J720+ and J721- and adjust R764 for 20mv DC. Connect your DMM to J707+ and the chassis and adjust R761 for 0mv DC, repeat at J718+ and chassis - and adjust R762 for 0mv DC. You can find the manual for free on HiFiengine, just sign up and the manuals are free.
 
Richs_Trains said:
Connect your DMM between J709+ and J711- and adjust trimming resistor R763 for 20mv DC repeat at J720+ and J721- and adjust R764 for 20mv DC. Connect your DMM to J707+ and the chassis and adjust R761 for 0mv DC, repeat at J718+ and chassis - and adjust R762 for 0mv DC. You can find the manual for free on HiFiengine, just sign up and the manuals are free.
Click to expand...
 
Thanks Rich. Downloaded the manual. Will print in the morning.

Hopefully those readings will be as specified without having to adjust anything but if not,
Is there any specific caution I should take?
 
JRM said:
Is there any specific caution I should take?
Click to expand...
As long as you are on the DBT you should be safe, if any readings are way off, don't connect your speakers till you get it adjusted. Adjustments should be made with the volume all the way down using the aux input, no speakers connected, and without a music source. If you get it in spec on both channels, you should be safe to remove the DBT and connect to the main power. Once on the main power, you should re-check and adjust as needed. Once it is in spec you should be able to apply a music source and connect speakers.
 
Hi Rich. Thanks for the guidance. Just one question as I would like to get it right.
What do I use through the AUX input if I am not to use music or speakers before getting it in spec?

Sorry for the dumb question.
 
Thanks Steven. Just to confirm my understanding:
Input selector must be selected to aux with no source input, no speakers, volume all the way down, balance and tone controls at center position and then, always wired through DBT and run the measurements/adjustments? :idea:
 
Exactly. After everything is set, and you remove DBT, I would recheck/reset offset and bias, assuming you have minnigrabber leads for your DMM where you won’t short anything out. Unit off - attach leads, turn on, do setting, turn off, remove leads. Repeat for the other setting.
 
the 1060 is a nice little amp. Just be careful of the replacement parts you use. If you change the wrong parts, you will wreck that classic Marantz sound.
 
Steven Tate said:
Exactly. After everything is set, and you remove DBT, I would recheck/reset offset and bias, assuming you have minnigrabber leads for your DMM where you won’t short anything out. Unit off - attach leads, turn on, do setting, turn off, remove leads. Repeat for the other setting.
Click to expand...
Thanks Steven. Purchased mini grabbers today for exactly that reason. Will keep you posted. Thank you for the support
 
mcgjohn said:
the 1060 is a nice little amp. Just be careful of the replacement parts you use. If you change the wrong parts, you will wreck that classic Marantz sound.
Click to expand...
Yup. I was worried bout that but luckily the kind guys on this forum guided me all the way even with replacement parts and they know their stuff so hopefully all will be well.
 
Hey Paul. Here's an idea. Instead of all this work why don't you just send me the one in your profile pic

:D;)
 
You must log in or register to reply here.
Back
Top Bottom