Digest for sci.electronics.repair@googlegroups.com - 24 updates in 7 topics

avagadro7@gmail.com: May 21 09:24AM -0700

recommend a source for quality RCA plugs ?
 
RCA-RCA plugs ?
 
Male AND Female
Lee <cyberwitch@ukonline.net>: May 21 01:16PM +0100

Have been asked to look at this Marantz PM6004 amplifier, report is it
"cuts out" if the volume is raised more than a third.
 
Had a Google and I get hits saying its "a common fault" but nothing
about resolutions.
 
Before tearing it apart, are there any common issues with this model?
(I found the auto shutdown "crackle" fix)
What it appears to do, on a dummy load, is the protection circuit is
kicking in, seemingly at random...
 
Obviously I'll get in there and measure voltages and waveforms when I
have it set up on the bench later :)
N_Cook <diverse@tcp.co.uk>: May 21 01:41PM +0100

On 21/05/2017 13:16, Lee wrote:
> kicking in, seemingly at random...
 
> Obviously I'll get in there and measure voltages and waveforms when I
> have it set up on the bench later :)
 
Before "tearing it apart", measure the main rail voltages, with a dummy
load. Going out of balance with some drift of bias somewhere is my
guess, then the protect mode cuts in
Phil Allison <pallison49@gmail.com>: May 21 06:07AM -0700

Lee wrote:
 
> kicking in, seemingly at random...
 
> Obviously I'll get in there and measure voltages and waveforms when I
> have it set up on the bench later :)
 
** You do own an ESR meter - don't you ??
 
 
 
..... Phil
Lee <cyberwitch@ukonline.net>: May 21 02:44PM +0100

On 21/05/2017 14:07, Phil Allison wrote:
 
> ** You do own an ESR meter - don't you ??
 
> ..... Phil
 
I have the Peak ESR70, from your comment I'll be sure to check the caps :)
Trevor Wilson <trevor@SPAMBLOCKrageaudio.com.au>: May 21 06:54AM +1000

On 20/05/2017 7:19 PM, Phil Allison wrote:
 
> ** Seen one of them too, a budget model for sure.
 
> Still, used with ordinary care they work fine long enough to outlast
> the sort of peripherals generally found.
 
**Back when I had my retail store, I sold Sansui, NAD, Marantz and a few
other brands. NAD walked out the door, being the flavour of the month.
Whilst a decent performer, particularly with difficult speakers, I felt
the mid range Sansui was a superior product. Better built, using better
quality components (the trimmer pots didn't fall apart and the knobs
didn't fly off the switches with the Sansui), the Sansui sounded better
with most speakers. The rep asked if I wanted to sell their cheaper
stuff (similar to the A-40). I asked for a sample for a week. I stripped
it down and checked out carefully. There were a number of potentially
problematical areas and I declined the offer to sell the range.
 
Sometime later, an acquaintance popped in to buy a stereo. I
demonstrated several system, including the Sansui (not the cheap stuff)
and he went away to think on it. I met up with him a few months later
and asked how his search was going. He ended up buying the cheap Sansui
from DME. I told him that there were no hard feelings and wished him
well. Another year passed and I ran across him again. I expressed my
condolences on the loss of his house. I asked him if they fire
authorities had tracked down the source of the fire that burned his
house down. "Yep." He said. "It was that bloody Sansui stereo. It caught
fire."
 
See, one of the issues that I identified with the Sansui, is that there
are combustible materials on each end (plastic end pieces) and a pressed
fibre board base-plate. That, combined with a power transformer, where
the thermal fuse connections are easily accessible from the outside of
the transformer, means that lazy techs simply short the thermal fuse
when it fails (which it did in 90% of that range of Sansui amps). I
suspect my old friend had picked up a repacked amp, that had failed. You
can work out the rest. Horrible quality products.
 
 
--
Trevor Wilson
www.rageaudio.com.au
Phil Allison <pallison49@gmail.com>: May 20 06:49PM -0700

Trevor Wilson wrote:
 
--------------------

> when it fails (which it did in 90% of that range of Sansui amps). I
> suspect my old friend had picked up a repacked amp, that had failed. You
> can work out the rest. Horrible quality products.
 
** The purpose of the thermal fuse inside the power tranny is to preserve the integrity of the Class 2 insulation. If that were bypassed and the tranny ever got hot enough to catch fire, there is a glass fuse that blows very quickly soon as turns begin to short out.
 
For the tranny to get seriously hot, the amp must be in use playing music loudly. This is not gonna be the case when no-one is home or all are asleep.
 
If the primary of the tranny failed due to voltage spikes on the AC supply, the
glass fuse would still prevent fire.

Maybe the Sansui amp was involved in the fire, rather than the cause of it.
 
I've see people sit candles on top of their stereos.
 
 
 
.... Phil
ohger1s@gmail.com: May 20 07:27PM -0700

On Saturday, May 20, 2017 at 9:49:42 PM UTC-4, Phil Allison wrote:
 
 
> Maybe the Sansui amp was involved in the fire, rather than the cause of it.
 
That's what I was thinking, but who knows? Around here firefighters need college degrees plus a few more years of specific training to advance beyond a typical grunt riding on the back of a hook and ladder. Unless someone died in the fire it wouldn't surprise me if the investigator just blamed the stereo, called it a day and went for a pizza.
 
Anyway, I remember the Sansuis of the 80s that would blow outputs and burn all the way back to the speaker selector switch. I never saw one that exteriorized flame but if the owner left the stupid thing on to keep the cat from being bored, it might have shorted it's outputs. Still, it's hard to believe it made it outside the case.
Phil Allison <pallison49@gmail.com>: May 20 08:52PM -0700

Trevor Wilson wrote:
 
--------------------
 
> less costly to make than their good models. As an authorised service
> agent for the importer, since 1980, I've seen them all, though Interdyn
> no longer import Luxman.
 
** Did you deal with Gordon Hoskins at any stage?
 
I met him in the late 70s while doing service work for a hi-fi and TV shop in Woollarah.
 
Despite the store stocking various Interdyn items, he refused to supply any spares or info on Luxman etc.
 
 
 
... Phil
 
 
 
 
... Phil
Trevor Wilson <trevor@SPAMBLOCKrageaudio.com.au>: May 21 03:22PM +1000

On 21/05/2017 1:52 PM, Phil Allison wrote:
>> agent for the importer, since 1980, I've seen them all, though Interdyn
>> no longer import Luxman.
 
> ** Did you deal with Gordon Hoskins at any stage?
 
**Of course. I even did work for him for a few years. To his credit,
bills were always paid by the due date. I mostly dealt with Dianne down
there at Arncliff, I never bought Luxman spares from him. I went
straight to the importer - International Dynamics. Excellent company to
deal with. Always pay their bills on time.
 
 
> I met him in the late 70s while doing service work for a hi-fi and TV shop in Woollarah.
 
> Despite the store stocking various Interdyn items, he refused to supply any spares or info on Luxman etc.
 
**That's because he is a massive dickhead. Certainly be 1980 (and
probably a long time prior) Interdyn were the importers for Luxman.
Hoskins was their Sydney agent and pretty much sole retailer for a long
time.
 
 
--
Trevor Wilson
www.rageaudio.com.au
Phil Allison <pallison49@gmail.com>: May 20 10:52PM -0700

Trevor Wilson wrote:
 
-------------------
 
 
> **Of course. I even did work for him for a few years. To his credit,
> bills were always paid by the due date. I mostly dealt with Dianne down
> there at Arncliff, I never bought Luxman spares from him.
 
** Think I dealt with her over the phone once, to get some Luxman amp BJTs.
 
She was polite, efficient and I got the *correct* parts in the mail the next day. So I rang her back to say how pleased I was.
 
I remember her being astonished that anyone bothered to do such a thing.
 
 
 
 
> > Despite the store stocking various Interdyn items, he refused to supply any spares or info on Luxman etc.
 
> **That's because he is a massive dickhead.
 
** ROTFL !!
 
 
> probably a long time prior) Interdyn were the importers for Luxman.
> Hoskins was their Sydney agent and pretty much sole retailer for a long
> time.
 
** After taking on Alpage and Celestion plus opening the "Quality Hi-Fi" store in York Street, he didn't get any better.
 
Gordon must have been a sleazy used-car salesman in a previous life....
 
 
 
..... Phil
Trevor Wilson <trevor@SPAMBLOCKrageaudio.com.au>: May 21 07:26PM +1000

On 21/05/2017 3:52 PM, Phil Allison wrote:
> Hi-Fi" store in York Street, he didn't get any better.
 
> Gordon must have been a sleazy used-car salesman in a previous
> life....
 
**Well, a new car salesman. But close enough.
 
 
 
--
Trevor Wilson
www.rageaudio.com.au
Phil Allison <pallison49@gmail.com>: May 21 04:54AM -0700

Trevor Wilson wrote:
 
------------------
 
 
> **Well, a new car salesman. But close enough.
 
** Really ??
 
When I first came across the horrible man, I suggested to the owners of Woollahra Hi-Fi ( Roger and Sue Tonkin ) that he must be linked with the nearby " Larke Hoskins " car dealership.
 
When asked, Gordon strenuously denied any connection.
 
Are you saying he lied ?
 
 
 
 
.... Phil
MJC <gravity@mjcoon.plus.com>: May 21 10:20AM +0100

I've annoyed myself because though I have subscribed to alt.computer as
recommended here, I cannot see the list of the posts in the "Thread
pane" so cannot read the posts.
 
I'm sure that happened to me before, and was due to some obscure setting
that makes each item in the list zero pixels high, or something. That
time, I found the cure and applied it successfully but cannot now
remember (creeping senescence) or retrieve what that cure was...
 
Can anyone give me a nudge, please?
 
Mike.
rickman <gnuarm@gmail.com>: May 20 12:56PM -0400


> Now my van has 12 LED switches no problems BUT most prob around 10-11 activate Bosch type relays ....the remaining transmit power but the LED does not come on in that wiring configuration.
 
> what happens here is wiring in series does not work but wiring in parallel is the existence for the 3 pin rocker. As in Bcae's diagram. Right ? Correct if I'm wrong
 
> I appreciate the help and the turning question as a terminal block or 2 have problems probably due to hasty wiring in series vs parallel or parallel vs series. Checking thru the system when looming for downstream series/parallel connections is in odor maybe preventing voltage bleed.
 
Which switch, which diagram?
 
--
 
Rick C
avagadro7@gmail.com: May 20 02:53PM -0700

On Saturday, May 20, 2017 at 12:56:49 PM UTC-4, rickman wrote:
 
> Which switch, which diagram?
 
> --
 
> Rick C
 
trollish, scroll down to BASIC ROCKER SWITCH STRUCTURE
 
 
http://www.bcae1.com/switches.htm
rickman <gnuarm@gmail.com>: May 20 06:37PM -0400


>> Rick C
 
> trollish, scroll down to BASIC ROCKER SWITCH STRUCTURE
 
> http://www.bcae1.com/switches.htm
 
That's ok. I've lost interest.
 
--
 
Rick C
avagadro7@gmail.com: May 21 01:41AM -0700

Super replies.
 
In haste, wiring in series to parallel on a 6 inch drilled AL bus bar could reduce or eliminate voltage around the inflicted area but not at the other end. ?!
 
The systems growth was not considered during the first stage. The redo parts are on the shelf. Waiting for a hiatus.
gilman080566@gmail.com: May 20 11:06AM -0700

Tv gives black screen and no sound
Adrian Caspersz <email@here.invalid>: May 20 07:22PM +0100

> Tv gives black screen and no sound
 
Hideous. Can you sue?
 
--
Adrian C
Sjouke Burry <burrynulnulfour@ppllaanneett.nnll>: May 20 10:52PM +0200

> Tv gives black screen and no sound
 
Plug in the power cord.
rickman <gnuarm@gmail.com>: May 20 05:16PM -0400

> Tv gives black screen and no sound
 
What type of TV is this? Is it an old CRT set, with tubes? Or is it a
modern set with an LCD or plasma display?
 
--
 
Rick C
Foxs Mercantile <jdangus@att.net>: May 20 04:24PM -0500

On 5/20/2017 4:16 PM, rickman wrote:
> On 5/20/2017 2:06 PM, gilman080566@gmail.com wrote:
>> Tv gives black screen and no sound
 
> What type of TV is this?
 
Broken apparently.
 
 
--
Jeff-1.0
wa6fwi
http://www.foxsmercantile.com
 
---
This email has been checked for viruses by AVG.
http://www.avg.com
"None" <none@nospam.org>: May 13 09:04AM -0400

< theckkkmaah @ retard . shortbus . edu > took a steaming dump>
> So you don't like Standard time, <FLUUUUUUSH>
 
Theckhhhmah, you retarded dumbfuck! You're one of usenet's village
idiots, and you just cannot stop flogging the rotted corpse of your
DST hobbyhorse (that's DST; look it up if you have to). But it's dead.
It's bleeding demised.
 
Maybe you can get a grownup to adjust your clocks twice a year, if
you're just too stupid to do it yourself. You keep telling people when
they should wake up and when they should go to sleep. Maybe you should
just worry about your own pathetic life, and stop being so fucking
lazy. Nobody wants to live their lives according to some retarded
schedule dreamed up by a microcephalic dumbfuck like you. Just live on
TDT (Theckmahhh Dumbfuck Time), that's fine, as long as you're ready
and wearing your hockey helmet when the short bus comes to take you to
your job at the hire-the-retard used crap store.
 
SFH, LB, FCKWAFA AOCADFR. RLB? LB???
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