sci.electronics.repair - 19 new messages in 9 topics - digest

sci.electronics.repair
http://groups.google.com/group/sci.electronics.repair?hl=en

sci.electronics.repair@googlegroups.com

Today's topics:

==============================================================================
TOPIC: Looking For Usable Multimeter - Cheap
http://groups.google.com/group/sci.electronics.repair/t/e1a0542b17d8b08d?hl=en
==============================================================================

== 1 of 4 ==
Date: Mon, Feb 21 2011 12:40 pm
From: Sjouke Burry

(PeteCresswell) wrote:
> I've got a Micronta that's getting weird on me. Thing must be
> 30 years old, but it always did what little I needed of it:
>
> - Checking automobile battery voltages
>
> - Checking various other batteries' voltages
>
> - Looking for shorts
>
>
> Can anybody recommend a replacement that doesn't cost an arm and
> a leg?
>
> I'm thinking hardware-store quality is going tb adequate, but
> don't know the ins and outs

(picture mode)google accu tester

300000 hits.

> http://www.winparts.nl/534/werkplaats/garage-gereedschap/absaar-acculader/0106747

The above link shows the one our local gasstation uses.

== 2 of 4 ==
Date: Mon, Feb 21 2011 2:27 pm
From: JeffM

(PeteCresswell) wrote:
> - Checking automobile battery voltages
>
Make sure you turn on the headlights first.

> - Checking various other batteries' voltages
>
Again, no-load voltages are mostly meaningless;
make yourself a test load to get any useful readings.
That the device that uses the batteries is still working properly
is the best indicator of their suitability.

There's a bi-monthly swap meet near me for computer stuff, etc.
that has old voltmeters (analog too!). They are mostly returns
that somebody blew the fuse in and returned.
Watching a needle move *can* give useful information
that a digital readout doesn't easily communicate.

== 3 of 4 ==
Date: Mon, Feb 21 2011 3:27 pm
From: "Jon Danniken"

William Sommerwerck wrote:
> Harbor Freight has a digital meter for $3 -- but I don't know how
> sturdy it is.

The unit itself is sturdy enough for occasional use (I keep one in the car
and a couple near the workbench), but the leads are about the cheapest I
have seen, especially the banana plugs.

Still, for a couple of bucks they are good enough to have a few laying about
for when you need an extra meter.

Jon

== 4 of 4 ==
Date: Mon, Feb 21 2011 3:57 pm
From: David Nebenzahl

On 2/21/2011 11:27 AM William Sommerwerck spake thus:

> Harbor Freight has a digital meter for $3 -- but I don't know how sturdy it
> is.

Plenty sturdy. The weak point of these meters (I've bought several of
them) seems to be the leads, the wires of which pull out pretty easily.
Other than that, they seem as good as any other hardware-store DMM.

--
The phrase "jump the shark" itself jumped the shark about a decade ago.

- Usenet

==============================================================================
TOPIC: Any Windoze experts on here ? Bit OT ...
http://groups.google.com/group/sci.electronics.repair/t/cffb93376f721ce8?hl=en
==============================================================================

== 1 of 5 ==
Date: Mon, Feb 21 2011 1:53 pm
From: Jeff Liebermann

On Mon, 21 Feb 2011 03:36:27 -0800 (PST), Bob Villa
<pheeh.zero@gmail.com> wrote:

>You would think the biggest bottle-neck would be your ram at 160Mhz?
>(166 for DDR single-channel). You would run great using XP or Win2K.

160MHz would make it DDR2-667Mhz or PC-5300 memory. With 64 bit
memory transfers (normal for a 64 bit OS and an AMD X2 processor), the
transfer rate is:
xfer rate = clock rate * bus multiplier * DDR doubler * 64 bits
= 160 Mhz * 2 * 2 * 64
= 5120 MBytes/sec
Methinks that's fast enough for most applications.

<http://en.wikipedia.org/wiki/DDR2_SDRAM#Chips_and_modules>
--
Jeff Liebermann jeffl@cruzio.com
150 Felker St #D http://www.LearnByDestroying.com
Santa Cruz CA 95060 http://802.11junk.com
Skype: JeffLiebermann AE6KS 831-336-2558

== 2 of 5 ==
Date: Mon, Feb 21 2011 4:34 pm
From: Bob Villa

On Feb 21, 3:53 pm, Jeff Liebermann <je...@cruzio.com> wrote:
> On Mon, 21 Feb 2011 03:36:27 -0800 (PST), Bob Villa
>
> <pheeh.z...@gmail.com> wrote:
> >You would think the biggest bottle-neck would be your ram at 160Mhz?
> >(166 for DDR single-channel). You would run great using XP or Win2K.
>
> 160MHz would make it DDR2-667Mhz or PC-5300 memory. With 64 bit
> memory transfers (normal for a 64 bit OS and an AMD X2 processor), the
> transfer rate is:
> xfer rate = clock rate * bus multiplier * DDR doubler * 64 bits
> = 160 Mhz * 2 * 2 * 64
> = 5120 MBytes/sec
> Methinks that's fast enough for most applications.
>
> <http://en.wikipedia.org/wiki/DDR2_SDRAM#Chips_and_modules>
> --
> Jeff Liebermann je...@cruzio.com
> 150 Felker St #D http://www.LearnByDestroying.com
> Santa Cruz CA 95060http://802.11junk.com
> Skype: JeffLiebermann AE6KS 831-336-2558

I am NO expert, but it appears you are just plugging numbers where you
want. He has DDR single-channel. Clock speed multipliers raise by
increments of 33...so how can 160 be considered valid?

== 3 of 5 ==
Date: Mon, Feb 21 2011 5:21 pm
From: Jeff Liebermann

On Mon, 21 Feb 2011 16:34:23 -0800 (PST), Bob Villa
<pheeh.zero@gmail.com> wrote:

>On Feb 21, 3:53�pm, Jeff Liebermann <je...@cruzio.com> wrote:
>> On Mon, 21 Feb 2011 03:36:27 -0800 (PST), Bob Villa
>>
>> <pheeh.z...@gmail.com> wrote:
>> >You would think the biggest bottle-neck would be your ram at 160Mhz?
>> >(166 for DDR single-channel). You would run great using XP or Win2K.
>>
>> 160MHz would make it DDR2-667Mhz or PC-5300 memory. �With 64 bit
>> memory transfers (normal for a 64 bit OS and an AMD X2 processor), the
>> transfer rate is:
>> � �xfer rate = clock rate * bus multiplier * DDR doubler * 64 bits
>> � � � � � � �= 160 Mhz � �* � �2 � � � � � * � 2 � � � � * 64
>> � � � � � � �= 5120 MBytes/sec
>> Methinks that's fast enough for most applications.
>>
>> <http://en.wikipedia.org/wiki/DDR2_SDRAM#Chips_and_modules>

>I am NO expert, but it appears you are just plugging numbers where you
>want. He has DDR single-channel. Clock speed multipliers raise by
>increments of 33...so how can 160 be considered valid?

Well, I'll admit that I'm making a substantial number of guesses due
to the usual lack of supplied details.

The 160Mhz memory clock is the real clue as DDR-333 is 166MHz while
DDR2-667 (PC2-5300) is 160MHz. You had it backwards (but I didn't
initially notice).

Whether the memory is slow or fast doesn't matter. The problem is
that the operating system is showing a substantial memory leak, and
exhibiting a corresponding slow down. Neither memory configuration
should have such a slow down.

--
Jeff Liebermann jeffl@cruzio.com
150 Felker St #D http://www.LearnByDestroying.com
Santa Cruz CA 95060 http://802.11junk.com
Skype: JeffLiebermann AE6KS 831-336-2558

== 4 of 5 ==
Date: Mon, Feb 21 2011 6:21 pm
From: "Arfa Daily"

"David Nebenzahl" <nobody@but.us.chickens> wrote in message
news:4d61f53e$0$26857$822641b3@news.adtechcomputers.com...
> On 2/19/2011 6:13 PM Arfa Daily spake thus:
>
>> "William Sommerwerck" <grizzledgeezer@comcast.net> wrote in message
>> news:ijp0kl$j5l$1@news.eternal-september.org...
>>
>>> Do you notice any slowdown when this occurs?
>>>
>>> I have a similar "problem" under W2K. Windows creates a virtual
>>> memory swap file when started, and expands it as needed.
>>> Unfortunately, the expanding swap file causes the machine to slow
>>> down, and a restart is eventually required. (This can take a few
>>> days to a week or more, depending on how "hard" you push the OS. I
>>> tend to have a lot of apps and files open at once, so I have to
>>> restart as often as every four or five days.)
>>
>> Yes, it does slow down. I have the Windoze memory usage widget running,
>> and you can see the usage creeping up over a couple of days or so, to the
>> point where it reaches 90+ %, at which point, the machine is crawling,
>> and having difficulty having multiple programs open at once.
>
> Meaning no disrespect here, but are you sure it's *memory* that's getting
> depleted here? I've got Win2K, and keep the Task Manager on my taskbar. It
> indicates CPU usage %, not memory, at least if you're talking about the
> visible indicator it shows onscreen. (Of course, it also shows memory
> usage for each task as well as CPU usage.)
>
>

Yes, I'm quite sure that it's memory. If you are not familiar with Win 7,
there are desktop 'widgets' available, one of which is a pair of little
graphic 'speedometers' for want of a better description, the larger of which
indicates CPU capacity percentage, and the smaller of which indicates
percentage of physical memory in use. Aside from this, I think I said
elsewhere in the thread that I have tried various memory analyser and
cleaner utilities, and the current one I've been trying out, also has a
display to indicate how much memory is in use, and if I have that one up
with the Windows widget, they agree exactly.

Arfa

== 5 of 5 ==
Date: Mon, Feb 21 2011 6:43 pm
From: "Arfa Daily"

"Jeff Liebermann" <jeffl@cruzio.com> wrote in message
news:vh26m699f0frntcnt97mdstq6kc8139ar8@4ax.com...
> On Mon, 21 Feb 2011 16:34:23 -0800 (PST), Bob Villa
> <pheeh.zero@gmail.com> wrote:
>
>>On Feb 21, 3:53 pm, Jeff Liebermann <je...@cruzio.com> wrote:
>>> On Mon, 21 Feb 2011 03:36:27 -0800 (PST), Bob Villa
>>>
>>> <pheeh.z...@gmail.com> wrote:
>>> >You would think the biggest bottle-neck would be your ram at 160Mhz?
>>> >(166 for DDR single-channel). You would run great using XP or Win2K.
>>>
>>> 160MHz would make it DDR2-667Mhz or PC-5300 memory. With 64 bit
>>> memory transfers (normal for a 64 bit OS and an AMD X2 processor), the
>>> transfer rate is:
>>> xfer rate = clock rate * bus multiplier * DDR doubler * 64 bits
>>> = 160 Mhz * 2 * 2 * 64
>>> = 5120 MBytes/sec
>>> Methinks that's fast enough for most applications.
>>>
>>> <http://en.wikipedia.org/wiki/DDR2_SDRAM#Chips_and_modules>
>
>>I am NO expert, but it appears you are just plugging numbers where you
>>want. He has DDR single-channel. Clock speed multipliers raise by
>>increments of 33...so how can 160 be considered valid?
>
> Well, I'll admit that I'm making a substantial number of guesses due
> to the usual lack of supplied details.
>
> The 160Mhz memory clock is the real clue as DDR-333 is 166MHz while
> DDR2-667 (PC2-5300) is 160MHz. You had it backwards (but I didn't
> initially notice).
>
> Whether the memory is slow or fast doesn't matter. The problem is
> that the operating system is showing a substantial memory leak, and
> exhibiting a corresponding slow down. Neither memory configuration
> should have such a slow down.

>
> --
> Jeff Liebermann

I was looking again at what you were saying in one of your other replies,
about how fast the memory is filling up for it to go from 35% to 90% in 3
days or so, but I think that I may have given the wrong impression there. It
doesn't just do it on its own. If I restart it right now, it will come back
with around 35% of memory in use, for the tasks that run all the time on the
machine. If I just leave it at that, and go to bed, when I get up in the
morning, it will still be at 35%. As it will at lunchtime, if I still do
nothing. It is the action of using the machine that causes the memory to
start to fill up. I use email a lot, but T-Bird is left running all the
time, so I guess it's not actually anything to do with that. I use Explorer
a lot to retrieve files on the machine, and Internet Explorer 8 for web
browsing. I use Windows Live Mail for newsgroup handling, and Acrobat and
latterly PDF-Viewer (although the problem was there before I even got that
program) for viewing pdf schematic files. I suppose that I need to look
carefully at what amount of memory is in use before I start a particular
task, and then recheck after I close it back down, although I am sure that
in general, I have actually done this, and seen that it never seems to go
back down to quite what it was, before whatever task was started up, which
is why I felt that it was an operating system thing in that it wasn't
totally removing everything from memory that was associated with that task,
after I close it down. As to the memory type, PC components are a mystery to
me. I am merely reporting here, what the system reports to me as to the type
and speed that's in there.

Arfa

==============================================================================
TOPIC: Cordless phone woes
http://groups.google.com/group/sci.electronics.repair/t/7e33309faf5ba341?hl=en
==============================================================================

== 1 of 3 ==
Date: Mon, Feb 21 2011 2:20 pm
From: "Colin Horsley"

"Smitty Two" <prestwhich@earthlink.net> wrote in message
news:prestwhich-30B290.08142021022011@mx02.eternal-september.org...
:I have a cordless phone / answering machine system at home that's
: started giving trouble of late. It's a Panasonic, model KX-TG5433. 5.8
: gHz. It came with 3 handsets, which I like because I can always find one
: of them and at least one always has a full battery charge. I'd guess
: it's about 5-8 years old.
:
: Problem is, two of the handsets have stopped reliably communicating with
: the base. I often can't get a dialtone to call out, nor answer an
: incoming call. Error message sometimes comes up on the handset display,
: saying I'm out of range.
:
: I know I can buy a new phone, but I don't mind tinkering with this one
: if there's a chance I can resurrect it. I've run into things like this
: before: electronic car keys not communicating with the car lock, TV
: remotes not communicating with the TV, etc. Is this a matter of
: frequency drift as components age?
:
: TIA for any useful feedback.
____________________________________________

Make sure that the Charge Contacts on the phone and base are CLEAN.
Reinsert the phone in the base after cleaning. Leave in for about 10 seconds.
The base communicates with the handset, and makes sure that they can
talk to each other.

Colin

== 2 of 3 ==
Date: Mon, Feb 21 2011 6:06 pm
From: "Arfa Daily"

"Smitty Two" <prestwhich@earthlink.net> wrote in message
news:prestwhich-E63D23.10051521022011@mx02.eternal-september.org...
> In article <iju455$udj$1@news.eternal-september.org>,
> "William Sommerwerck" <grizzledgeezer@comcast.net> wrote:
>
>> > Problem is, two of the handsets have stopped reliably
>> > communicating with the base. I often can't get a dialtone
>> > to call out, nor answer an incoming call. Error message
>> > sometimes comes up on the handset display, saying I'm
>> > out of range.
>>
>> Well, there's your problem.
>>
>> The most-likely cause is that the output of the base station is down.
>> Make
>> sure its antenna isn't dirty (!!!) or broken, and position the base
>> station
>> where the handsets can easily "see" it (RF-wise).
>
> Well, I started to hammer out a chiding reply to what I interpreted as
> your overly-simplistic suggestions. I was getting the "out of range"
> message or other non-operative condition even when I was standing right
> next to the base.
>
> But just to humor you, I wiped a layer of dust off the 4" long
> plastic-covered base antenna and rotated it to an upright position. I'm
> sure it's completely unrelated, but my intermittent issues are currently
> in remission. Can RF really not punch through a bit of dust?
>
> To those who suggested battery issues, agree that I'm pushing lifespan
> but they seem to be charging up fully and giving me good battery charge
> life still. FWIW, they're Ni-MH.
>
> Thank you.

It was probably the rotating of the antenna that did it. 'Cleaned' the oxide
off the contacting faces of the rotating joint maybe. Doesn't take much to
stop those sorts of frequencies ...

Arfa

== 3 of 3 ==
Date: Mon, Feb 21 2011 6:13 pm
From: "Arfa Daily"

"Dave Plowman (News)" <dave@davenoise.co.uk> wrote in message
news:51a91d4218dave@davenoise.co.uk...
> In article <prestwhich-30B290.08142021022011@mx02.eternal-september.org>,
> Smitty Two <prestwhich@earthlink.net> wrote:
>> I have a cordless phone / answering machine system at home that's
>> started giving trouble of late. It's a Panasonic, model KX-TG5433. 5.8
>> gHz. It came with 3 handsets, which I like because I can always find one
>> of them and at least one always has a full battery charge. I'd guess
>> it's about 5-8 years old.
>
>> Problem is, two of the handsets have stopped reliably communicating with
>> the base. I often can't get a dialtone to call out, nor answer an
>> incoming call. Error message sometimes comes up on the handset display,
>> saying I'm out of range.
>
> First thing I'd check is the batteries. 8 years is a very good life for
> rechargeable types. Swap from the good handset to a faulty one to prove
> this hypothesis.
>
> --
> *He has Van Gogh's ear for music.
>
> Dave Plowman

Considering that with most cordless phone handsets, the manufacturers pay
little if any attention to 'correct' charging schemes for the type of
battery being used, they are remarkably long-lived. I used to do a lot of
work on first, second and third generation cordlesses, and almost all,
irrespective of the manufacturer or cost, charged the batteries via a simple
single current limiting resistor.

My household cordless has two handsets, and I would guess that they are
probably getting on for 10 years old now, and they are both on their
original sets of batteries, and are both still going strong. Sometimes, the
handset in the bedroom, can sit on its charging base for days, undisturbed,
with the batteries just cooking away gently, but doesn't seem to have done
them any harm.

Arfa

==============================================================================
TOPIC: Update - 24V Lead Acid Battery Charger Control Module PCB
Recommendations
http://groups.google.com/group/sci.electronics.repair/t/79ff67912b0400b9?hl=en
==============================================================================

== 1 of 1 ==
Date: Mon, Feb 21 2011 2:38 pm
From: Cydrome Leader

Wild_Bill <wb_wildbill@xspamyahoo.com> wrote:
> I should've realized I'd leave out details since the post was composed
> quickly.
>
> The charger consists of a ferro-resonant transformer (third xfmr winding
> wound over the xfmr secondary and 2uF AC capacitor), and a full wave
> rectifier (2 diodes).
>
> A relay handles the begin/stop-off control (xfmr primary energize/off), and
> the charger has no high current components (other than the diodes).
>
> I don't see what takes care of the 24V voltage regulation.

that ferroresonant transformer does the voltage regulation- no joke
either. That's what the really weird core or shunts and extra winding with
the capacitor are for.

==============================================================================
TOPIC: RCA Commercial Chassis ITC008
http://groups.google.com/group/sci.electronics.repair/t/26a820f91462709f?hl=en
==============================================================================

== 1 of 1 ==
Date: Mon, Feb 21 2011 4:55 pm
From: gaianavatar1

We service commercial TV's and we are hitting a brick wall with this particular model. It's an RCA J27F635YX1 using the ITC008 chassis. The symptom that has us stymied is: the power cycles on & off every 5 seconds. We have replaced EVERY component on the I2C line ( micro, EEPROM, MAV board, DSCI board, tuner, audio processor IC, replaced all tact switches, all supplies normal. The kicker is this: the Chipper Checker won't recognize this chassis. We have both CC1 & CC2, latest version of CC software. In short, we have tried everything short of replacing the chassis. Tech support couldn't explain why the chipper check doesn't work, now they avoid our calls, they don't know either. Anybody got any ideas?

==============================================================================
TOPIC: Ryon Gambill Is An Asshat
http://groups.google.com/group/sci.electronics.repair/t/8d0d8d14452ae3d5?hl=en
==============================================================================

== 1 of 1 ==
Date: Mon, Feb 21 2011 5:45 pm
From: Anonymous

The CEO and sole stockholder of Marauder Corporation is Ryon Gambill.
Ryon Gambill is a CONVICTED CRIMINAL.

Call him on his DIRECT LINE if he has harassed you: 760 423-1111
Write him, show up and bother him or sign him up for junk mail:

Ryon and Kim Gambill
75147 La Sierra Drive
Palm Desert CA 92211

==============================================================================
TOPIC: marlboro guitar amp
http://groups.google.com/group/sci.electronics.repair/t/fcc95e7f4b10829b?hl=en
==============================================================================

== 1 of 1 ==
Date: Mon, Feb 21 2011 5:59 pm
From: "lurk"

Anyone have a schematic for this unit ? its a marlboro 1200R thanks

==============================================================================
TOPIC: problems with my Adcom CD player
http://groups.google.com/group/sci.electronics.repair/t/d0309f8834e2db93?hl=en
==============================================================================

== 1 of 2 ==
Date: Mon, Feb 21 2011 6:46 pm
From: "Arfa Daily"

"N_Cook" <diverse@tcp.co.uk> wrote in message
news:ijtmjf$g22$1@news.eternal-september.org...
> Shaun <rowl@nomail.com> wrote in message
> news:yOh8p.17738$D94.1575@newsfe20.iad...
>>
>> "Jeff Liebermann" <jeffl@cruzio.com> wrote in message
>> news:4673m6prr0ls8tlmj1kaaa2rid3sbapos7@4ax.com...
>> > On Sun, 20 Feb 2011 14:13:20 -0600, "Shaun" <rowl@nomail.com> wrote:
>> >
>> >>I have a used ADCOM GCD-700 5 disk CD player that was given to me and
>> >>it
>> >>is
>> >>overly sensitive to vibrations, bumps and slight scratches on the CDs.
>> >>I've
>> >>mounted it on vibration absorbing rubber and this has greatly impoved
> its
>> >>bump and vibration sensitivity, but it is still very sensitive to the
>> >>slightest mark or scratch on cds. How can I cure this.
>> >
>> >
>> > First, clean out any crud from the laser head assembly. If that
>> > doesn't improve things, replace it. That's a 1997 vintage machine so
>> > parts may be tricky to find... Oh, too easy:
>> > <http://www.adcomparts.com/part.php?item=46001400>
>> > However, I don't think it's worth $50 to fix something that old.
>> >
>> > More:
>> > <http://www.fixya.com/support/p134391-adcom_gcd_700_5_disc_cd_changer>
>> > <http://www.fixya.com/support/t648590-adcom_gcd_700_tracking_problems>
>> >
>> > --
>> > Jeff Liebermann jeffl@cruzio.com
>> > 150 Felker St #D http://www.LearnByDestroying.com
>> > Santa Cruz CA 95060 http://802.11junk.com
>> > Skype: JeffLiebermann AE6KS 831-336-2558
>> >
>>
>> Thanks for the links, I'll probably order a new laser head for it, but
> first
>> I'll lake it apart and clean the lenses.
>>
>> Shaun
>>
>>
>
> Then after cleaning and before ditching. Find the "power pot" ,measure
> resistance with a DVM , "both ways" in case of a difference, so you can
> get
> back to that value. Change the value , no more than 5 percent, to see if
> it
> improves error proneness
>

It's not quite that straightforward on a '240, as there are three pots on
there, and considerable interaction between them. I would not recommend
touching them, as at least one of them is *extremely* critical in its
setting to get the thing to play at all.

Arfa

== 2 of 2 ==
Date: Tues, Feb 22 2011 12:18 am
From: "N_Cook"

Arfa Daily <arfa.daily@ntlworld.com> wrote in message
news:msF8p.28752$Xf4.24541@newsfe13.ams2...
>
>
> "N_Cook" <diverse@tcp.co.uk> wrote in message
> news:ijtmjf$g22$1@news.eternal-september.org...
> > Shaun <rowl@nomail.com> wrote in message
> > news:yOh8p.17738$D94.1575@newsfe20.iad...
> >>
> >> "Jeff Liebermann" <jeffl@cruzio.com> wrote in message
> >> news:4673m6prr0ls8tlmj1kaaa2rid3sbapos7@4ax.com...
> >> > On Sun, 20 Feb 2011 14:13:20 -0600, "Shaun" <rowl@nomail.com> wrote:
> >> >
> >> >>I have a used ADCOM GCD-700 5 disk CD player that was given to me and
> >> >>it
> >> >>is
> >> >>overly sensitive to vibrations, bumps and slight scratches on the
CDs.
> >> >>I've
> >> >>mounted it on vibration absorbing rubber and this has greatly impoved
> > its
> >> >>bump and vibration sensitivity, but it is still very sensitive to the
> >> >>slightest mark or scratch on cds. How can I cure this.
> >> >
> >> >
> >> > First, clean out any crud from the laser head assembly. If that
> >> > doesn't improve things, replace it. That's a 1997 vintage machine so
> >> > parts may be tricky to find... Oh, too easy:
> >> > <http://www.adcomparts.com/part.php?item=46001400>
> >> > However, I don't think it's worth $50 to fix something that old.
> >> >
> >> > More:
> >> >
<http://www.fixya.com/support/p134391-adcom_gcd_700_5_disc_cd_changer>
> >> >
<http://www.fixya.com/support/t648590-adcom_gcd_700_tracking_problems>
> >> >
> >> > --
> >> > Jeff Liebermann jeffl@cruzio.com
> >> > 150 Felker St #D http://www.LearnByDestroying.com
> >> > Santa Cruz CA 95060 http://802.11junk.com
> >> > Skype: JeffLiebermann AE6KS 831-336-2558
> >> >
> >>
> >> Thanks for the links, I'll probably order a new laser head for it, but
> > first
> >> I'll lake it apart and clean the lenses.
> >>
> >> Shaun
> >>
> >>
> >
> > Then after cleaning and before ditching. Find the "power pot" ,measure
> > resistance with a DVM , "both ways" in case of a difference, so you can
> > get
> > back to that value. Change the value , no more than 5 percent, to see if
> > it
> > improves error proneness
> >
>
> It's not quite that straightforward on a '240, as there are three pots on
> there, and considerable interaction between them. I would not recommend
> touching them, as at least one of them is *extremely* critical in its
> setting to get the thing to play at all.
>
> Arfa
>

Which implies 3 analoguey things that could drift over time. I would take 3x
0.1 percent measurements and tabulate some twiddlings v drop-out time of a
known bad ie deliberately scratched track on a CD. As last legs anyway,
nothing to loose except a bit of time

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