I have this fairly recent integrated Marantz amp PM6005 which wasn’t cheap. It has been in storage for a couple of years and I just set it up again in the new digs.
Incredibly annoyingly, after a couple of minutes the unit shuts down and the red power light flashes.
Sitting on the bench unconnected, the power stays on. As soon as I connect a source to it , it goes back on the blink.
I have read of others having a similar episode after bringing back out of storage. 2 options suggested are poor connections or overheating. The same set up worked fine on another amp so it aint wiring and the amp isn’t even warm so its not that either.
So I suspect it’s “internal”.
Thanks in advance.
First thing I did was look in the troubleshooting section of the user manual.
Symptom: Power automatically turns off.
Cause / Solution: The Auto Standby mode is set. The Auto Standby mode switches the unit to standby mode when the unit is not operated for approximately 30 minutes. To disable the Auto Standby mode, press and hold the SOURCE DIRECT button on the unit for more than 5 seconds when the Auto Standby mode is enabled.
Symptom: Power turns off and the power indicator flashes in red approx. every 0.25 seconds.
Cause / Solution:
Due to the temperature rise within this unit, the protection circuit is working. Turn off the
power and wait about an hour until this unit sufficiently cools down. Then, turn on the power
again.
• Please re-install this unit in a place having good ventilation.
• Check the speaker connection. The protection circuit may have been activated because
speaker cable core wires came in contact with each other or a core wire was disconnected
from the connector and came in contact with the rear panel of this unit. After unplugging the
power cord, take corrective action such as firmly re-twisting the core wire or taking care of the
connector, and then reconnect the wire.
• Turn down the volume and turn on the power again.
• This unit’s amplifier circuit has failed. Turn off the power and please contact the Marantz
service adviser.
If it has a protection circuit, other likely triggers could be open or short circuit somewhere. If it has been in storage, has it got damp, cold or dusty? Do you have spiders down under? If so, unplug from the mains and leave for 30 mins. Remove the lid and, with a small brush, go over the circuit board to free up any dust or dead spider legs. Vacuum out the grot if you can. Also consider a spray with a can of compressed air.
Are you using bare-wire connections? best to use plugs on the cables as it removes the chance of any strands shorting together.
Fenty, you’ve made this old man very, very happy. Viagra is a placebo in comparison.
Hi Steve, I have the manual but have just moved house so it is not readily to hand. The amp was stored in a sealed box ,bubble wrapped and in a shipping container. I guess it got a bit hot over summer but no humidity, spiders,snakes or sharks to attack it
Since posting I set it up with a separate set up. Powered with a different cable and plugged direct to the power point – no power board. I used a different source, a CD player. I used different speaker wires , carefully connected, to different speakers.
Same result. The unit did this after a few seconds of the sound source being played. the unit was not hot.
I understand these units have 2 protection circuits.What bugs me – working fine, put in a box, leave on a shelf for 2 years then fire ‘er up again and its buggered. What a piss off.
Whilst lunching yesterday with my dear friend Mick, a major audiophile, I mentioned the query raised by @Junior-Wells and the response from @fentonsteve
After I read out Steve’s thoughts on the matter, Mick insisted that I mention the possibility that the problem relates to ‘a faulty power input module’. This means nothing to me as I just listen to the damn music. However, I hope this might be of some relevance.
I have nominated Mick in the newcomers category (sponsored by Fenton Audiotech) of this year’s Audio Awards
Thanks for taking the time to explore my ATM with your learned friend. That YouTube Fents posted seems highly likely to be the problem. Watched it through and none the wiser other than some little thing is faulty and was bound to fail due to poor design and unless you know what you are doing you may not pick it up.
Sorry for the tardy reply, I had stuff to do at work yesterday (I’m out next Monday & Tuesday having a Colonoscopy) and I’ve been to Lincoln to visit Offspring the Elder today.
It seems this is a common fault but is easily repairable. Here’s an incredibly tedious video describing the fix, voiced by a man even more dull than me.
I’ve recorded that. Tomorrow morning at 5a.m. (when I usually first stir) I’ll play it again. Probably wake up next Tuesday. Bliss
I forgot to add: if this really is a common problem, the design of the circuit is, frankly, a bit sh!t. We’ve had many, many, decades to refine the Class A-B amplifier.
Saul Marantz would be turning in his grave.
Turning it off and back on again in his grave?
I agree. It’s not high end kit but not cheap either. Why does it choose to fuck up after slumbering in a box for 2 years and just after I have moved to the country, a good 2 hours from the service agent?
I don’t think slumbering in a box is anything to do with the failure, it’s just crap design (possibly deliberate to encourage you to buy a replacement).
The GF prior to Mrs F had a Technics amp which ran for about 20 minutes and then a relay clicked and no more sound came out until it cooled down. The relay was there to avoid switch-on ‘thump’, and required 0.6 Amps to keep it on. Sadly, it was fed by a 0.5 Amp Voltage Regulator. So I dismanted the whole thing (which took hours), replaced the 0.5A part with its 1.0 Amp equivalent (which took 5 minutes), and rebuilt it (which took more hours). A simple case of shit design – a part running at 120% of its rating, replaced by one running at 60%. The cost differential would have been one new pence, tops.
I get it: you’re waiting for Junior to entice you into his home, with hard currency of Los denomination. Will you be paying for your own travel expenses?
Reader: I didn’t marry her.
My Best Man lives an hour south of Sydney in Wollongong, and I’m overdue a visit. It’s the same continent, at least.
Currently running a shitty old Yamaha amp from maybe the nineties. that was lying around. Fired up no problems.
I sold a yamaha CA610 to a mate. Built in 1977/78. Think it has had one service. Works fine.