troubles

Here there is such a question: the computer, the infection, burns all the VGs that you insert into it.
What could be the matter? I recently soldered a new cable from the controller to the flop guide,
maybe it’s worth checking?

WBR, Sergey. [ZX]
mailto - gri...@mail.ru
http://www.ascendany.homepad.com

... Blessed calling, because they will connect

SO> Here there is a question: the computer, the infection, is burning all the VGs that you
SO> insert into it.
SO> What could be the matter? I recently soldered a new cable from the controller to the
SO> flop guide, maybe it’s worth checking?

VG93 usually does not have direct contact with the cable. The buffers are there. How exactly do they burn, when the power is turned on, or during operation is there nothing wrong with it?
Does it stop writing or hangs up the car on the bus? Symptoms in more detail, PLZ.

Sincerely, Alex from FFC COMPUTERS.

>E-MAIL: asde...@softhome.net ICQ: #13064553

SO> insert. What could be the matter? I recently soldered a new cable from the
SO> controller to the flop guide, maybe it’s worth checking? Is it running out of data bus? (dirty striped screen).
Power supply curve 100%. Even if the tension is there.

Sincerely, Yura DOORSFAN
[ZX] [DOORS] [BLACK SABBATH]

SO> Here is a question: the computer, the infection, burns all the VGs that you
SO> insert into it. What could be the matter? I recently soldered a new cable from the
SO> controller to the flop guide, maybe it’s worth checking?

SO> What could be the matter? I recently soldered a new cable from the controller to the
SO> flop guide,
SO> maybe it’s worth checking?

Check, maybe you have 12 volts later than 5 volts supplied from the power supply? VG-ka
are afraid of the lack of 12v when 5 are supplied. Usually, to prevent such cases, a diode is installed - 5 V is supplied through the diode to the 40th leg of the VG. It seems so. And also
if your computer does not work with the disk, and the VG gets very hot, check the buffers, maybe one has failed and is loading it immeasurably ;-).

Sincerely, Dmitry.

July 31, 1999, Alex Letaev squeezed the keyboard, hoping that the following words would reach Sergey Orlov:

AL> VG93 usually does not have direct contact with the cable. The buffers are there. How
AL> exactly do they burn, when the power is turned on, or during operation not with tag
AL> why? Stops writing or hangs the car over the tire? Symptoms for
AL> in more detail, PLZ.

However, when you fold back the cable while the computer is running, the VGs are scorched
nothing to do.

[Team Kelly] [I ZX]
Hasta la vista.
Tim Kelly

And only the one who has nothing to say
screams the loudest...
(c) A. Makarevich

... tim_...@mail.ru 500:622/1@zxnet http://www.chat.ru/~tim_kelly

... tim_...@mail.ru 500:622/1@zxnet http://www.chat.ru/~tim_kelly

SO>> you will insert it into him. What could be the matter? I recently soldered a new cable
SO>> from the controller to the flop guide, maybe it’s worth checking?

DP> Check, maybe you have 12 volts later than 5 volts supplied from the power supply?
DP> VG is afraid of the lack of 12 volts when 5 are supplied. Usually, to prevent such things, a diode is installed - 5 V is supplied through the diode to the 40
DP leg of the VG. It seems so. And if your computer doesn’t work with a disk, and
DP> the VG is getting very hot, check the buffers, maybe one has failed and the
DP> is loading it immeasurably ;-).

The VG is more likely to burn when 12 is supplied without 5 volts.
A protection circuit is assembled on two transistors, so that when absence +5 12
not given. Well, there should also be a diode there...

=== cut ===
╔═══════════════════════════════ ════════════════════════════╗
║ Kp1818VG93 power protection circuit. ║
╟───────────────────────────────
║ ┌─────┬───────────┬──< +12V from power supply ║
║ ┌┴┐ │ │ ║
║ 1kOhm│ │ E│ ──┴── 0.1-1.0 uF ║
║ └┬┘ │/ KT361 ──┬── ║
║ ├───┤ │ ║
║ │/ │\ ─┴─ ║
║+5v >──┬─┤ │ ║
║ │ │\ └──────┬─────────┬───────> on the 40th leg of VG93 ║
║ KT315 │ E│ │ ║
║ └──│───┼>┼──────┤ ║
║ ┌┴┐ KD522 ──┴── 0.1-1.0 μF ║
║ 1кОм│ │ ──┬── ║
║ └┬┘ │ ║
║ └───┼<┼───────┤ ║
║ КС133 │ ┌───────────────────────Є
║ ─┴─ │ Desined by Ivan Mak ║
, Protoss are attacking my Zerlings! It's time to wake up. Ivan.

- Divorce scheme, big and small.. [ Sprinter-II ] [Forth-CPU] [ZX]

... E-mail: ivan...@mail.ru * Welcome to www.atlant.ru/peters *

2 Aug 1999 you wrote here:

DP> Check, maybe you have 12 volts later than 5 volts supplied from the power supply? VG-ka
DP> is afraid of the lack of 12v when 5 are supplied. Usually, to prevent such

VG-shka is more afraid of the lack of +5V when 12 are applied!

All the best.
Sincerely Roman.

DP> they install a diode - they supply 5 V through the diode to the 40th leg of the VG. It seems so. And also
DP> if your computer does not work with the disk, and the VG gets very hot, check the
DP> buffers, maybe one has failed and is loading it immeasurably ;-).
That’s it, I’ll check it.

DP> power supply ? VG is afraid of the lack of 12V when 5 are applied.

Only the other way around... The absence of +5V when +12 is applied...

With best wishes, Dmitry. [ZX]

I opened my eyes and saw that on 02-08-99 at 19:55:25
Tim Kelly wrote to Sergey Orlov on the topic of "troubles"...

SO>> Here there is such a question: the computer, an infection, shoots all the VGs that you insert into it
SO>>. What could be the matter? I recently soldered a new cable from the
SO>> controller to the floppy drive, maybe it’s worth checking?

TK> Firstly, check the 12v power supply.
TK> And secondly, of course, the cable to the disk drive - Vitalik Svetashov had the same
TK> same
TK> trouble, as far as I remember. Check for short
TK> between
TK> signals.

The problem is most likely in the power supply. It may initially supply 5 volts, then after half a second 12 volts (or vice versa). Because of
this, my VG failed, but then I installed the impilsnik and everything is ok!

All the best to you, Tim!

Yuri Nazarenko/Rezidnet/Discovery group
e-mail : Yuri_Nazar...@zxnet.spb.ru

SO> And how when, 2 and 3 burned out when the power was turned on, 1 and 4 worked for
SO> a month.

Then most likely they said correctly - because of the power.

SO> Uh-huh stops writing and hangs up the car.

How, at the same time? Well, if it hangs, then it’s clear that it will stop writing, but
if it just stops writing, it doesn’t happen, despite the fact that it reads normally?

02 Aug 99 19:58, Tim Kelly -> Alex Letaev:

AL>> VG93 usually does not have direct contact with the cable.
AL>> The buffers are there. How exactly do they burn, when the power is turned on,
AL>> or during operation, not with anything? Does
AL>> stop writing or hang up the car? Symptoms
AL>> in more detail, PLZ.

TK> However, when the cable is folded back while the
TK> computer is running, the VGs are scorching, there’s no need to do it.

Instead of 12, isn’t it 18 or 24? Is it worth a diode from 5 to 12?
And a stupid question, but I came across something similar in the practice of Polytech:
and the other side (the key) of the microcircuit is in vain? :)

TK> And only the one who has nothing to say
TK> screams the loudest...
TK> (c) A. Makarevich

Sincerely, Wladimir

02 Aug 99 12:10, Sergey Orlov -> Alex Letaev:

SO> Ugh stops writing and hangs up.

^^^^^^^^^^^^

Overloads on the inputs or, rather, surges of much more than 5 volts
on the signal inputs. Somewhere 12 is running along the control circuits.

Sincerely, Wladimir

06 Aug 99 02:25, Dmitry Sharikov -> Dmitry Pavlukhin:

DP>> Check, maybe you have 12 volts later than 5 volts supplied from
DP>> power supply? VG is afraid of the lack of 12V when
DP>> 5 are applied.

DS> Only the other way around... Lack of +5V when +12 is applied...

It’s just the opposite (although he’s also afraid of the opposite).
That’s why they install a diode so that at least 5 comes in if 12 no.
Then at least three minutes before it crashes, and during this time
you will have time to notice that something is wrong.

Sincerely, Wladimir

05 Aug 99 08:46, Roman Milukov -> Dmitry Pavlukhin:

RM> The VG-shka is more afraid of the lack of +5V when 12 are supplied!

Isn’t it easier to assemble a stabilizer on one 815, which would
feed only 12 volts to the VG, did you do 5 yourself?

Sincerely, Wladimir

AL> How, at the same time? Well, if it hangs, then it’s clear that it will stop writing, but
AL> if it just stops writing, it doesn’t happen, despite the fact that it reads normally?

yes. I mean, the car is hanging. In short 2ALL: thank you very much for the advice, tomorrow
I will implement everything I heard.

WBR, Sergey [ZX] mailto - gri...@mail.ru
http://www.ascendancy.homepad.com

YN> volts, then after half a second 12 (or vice versa). Because of
YN> this VG went out, but then I installed an impulse device and everything is ok!
And I already have an impulse device.

WBR, Tim [ZX] mailto - gri...@mail.ru
http://www.ascendancy.homepad.com

DS> Only the other way around... Absence of +5V when +12V was applied...

I didn’t want to answer this letter, but since there are a lot of similar ones
I will have to.
In my practice, there were several cases of VG failure due to the lack of 12V when
five were applied. And at the same time, it’s not in vain that the diode is installed - from 5V to 12V, i.e. so that on
40 leg
at least 5 volts, but there was. Of course, the absence of 5V when 12V is supplied is no less
dangerous for
the health of the VG.

Sincerely, Dmitry.

AL> How, at the same time? Well, if it hangs, then it is clear that
AL> will stop writing, but if it just stops writing,
AL> even though it reads normally?

If it crashes and at the same time hangs the machine altogether -
it is clear that it is draining the data/address/control buses of the
machine itself. That is, the input buffers of the VG are knocked out.
But here the reason is more likely on the side of the circuits connected
to the inputs of the VG.
Knock out, for example, AY on the output - the machine will not hang.

Sincerely, Wladimir

This could be the fault of both the disk drive and the buffer elements.
At +30 degrees in my hot room, a Pentagon with
4 disk drives is only capable of writing on SONY,
the other three drives, even Epson, become “read-only”.

Sincerely, Wladimir

06 Aug 99 10:31, Yuri Nazarenko -> Tim Kelly:

YN> Most likely the problem is in the power supply. It may initially supply
YN> 5 volts, then after half a second 12 (or vice versa). Because of this, my VG failed, but then I installed the impulsnik and
YN> everything is ok!

The impulsnik is the best solution. The best one is from "Search",
if you can get it - it runs a computer with 4 disk drives and a modem,
or MS 9016.

Sincerely, Wladimir

One day, 09 Aug 97 20:41:29, Eugene Tyukaev wrote to Dmitry Pavluhin

DP> they install a diode - they supply 5 V through the diode at the 40th leg of the VG. It seems so. And
DP> also if your computer does not work with the disk, and the VG gets very hot
DP>, check the buffers, maybe one has crashed and loads it
DP> immeasurably ;-).
ET> or maybe try to cool the VG?
How? A cooler or something :) So at night it will make noise like .... :)

WBR, Sergey Orlov [ZX]
mailto: gri...@mail.ru
http://www.ascendancy.homepad.com

Saturday August 09 1997 19:41, Eugene Tyukaev ─── Dmitry Pavlukhin:

DP>> Check, maybe you have 12 volts later than 5 supplied from the power supply? VG-ka
DP>> are afraid of the lack of 12v when 5 are supplied. Usually, to prevent such
ET>, I intervene a little:
ET> I have verified from my personal experience and the experience of burned-out VGashkas that they fly in the
ET> absence of not 12 volts, but 5 in the presence of 12 :(
For a couple of months, my computer worked without 12. VGshka is still alive...

DP>> pheres, maybe one flew out and is loading her immeasurably ;-).

SO> How? A cooler or something :) So at night it will make noise like.... :)
I actually meant whether your VGshka is glitching from overheating,
if so, then take it to the morgue :(
and to cool it down - anoint it with cotton wool soaked in alcohol/cologne/or whatever
and a little blow - it will be clear right away!
by the way, this is generally just an excellent method for calculating micros, which supposedly start to fail when they heat up, somehow in Leningrad I picked up all the RU5
_normal_ ones, although one guy then ruined them - he started
knocking on them :(

SO> WBR, Sergey Orlov [ZX]

20:35 12.Aug.1999 Always yours Point777

YN>> this VG went away, but then I installed an impulse generator and everything is ok!
SO> And I already have an impulse generator.

Now I also have an impulse generator, but before it was not clear what kind of
computer it was.

Well, BYE's for you, Sergey!

EM> Wow. I also have to cool it... When it works for 20-30 minutes without
EM> cooling, it immediately starts to crack the discs when recording.

Similarly. :) True, my case does not have any slots (in sufficient quantities) and
there is a lot stuffed into it (modem, power supply and some other crap). :) I was warming up terribly, because of which the ksasik ruined the floppy disks. :) As soon as the cooler was set to four,
so everything became hockey-obi (2 non-XAS fans> And it was not a buggy driver
:-P ). For yellow scorpions, such a cooler immediately covers the VGeyka and ROM. ATX straight.
;)

EM> Good luck! Evgeny.

With respect, Alex Noman.

EM> For a couple of months my computer worked without 12. VGshka is still alive...
very strange :)

DP>>> pheres, maybe one of them flew out and is loading her immeasurably ;-).

SO> How? A cooler or something :) So at night it will make noise like .... :)

You can attach a radiator on top of it, but this is a “poultice to the ass.”
It’s not a matter of temperature.

I’ve already heard about similar problems in the Pentagon twice.
One person regularly changed VGshki once a month, another also burned several pieces.
In both cases, the cause was eliminated. How - I don’t know, or I forgot, or didn’t
ask.
In my practice, I have never seen such cases, where everything is normal, but
the VGs are burning. Once there was a similar effect, but there was a broken panel under the VGshka, I changed the panel (no amount of “protection” can save me here). Another time this
was due to a defect in the power supply - sometimes +5V disappeared...

WB> Isn’t it easier to assemble a stabilizer on one 815, which
WB> would feed the VG only 12 volts, and make 5 volts himself?

The local assembly genius practiced this - there is a separate en5 for powering the VG,
It is powered by +12.

Sincerely,
Renat

EM>> cooling works, so it immediately starts to smoke discs when recording.
ET> means buggy :(

Hardly. :) This is something with the main board. I have changed the VG-eyki a hundred times already. :)

EM>> works, so it immediately starts to smoke discs when recording.
ET> means buggy :(

No. It doesn’t have to be.
Sometimes this can be cured by increasing the capacity on the 6th leg of the IR16 in the controller
of the drive (D96 in the Pentagon) to ~300 pf.
Personally I also had this problem once. Installing
this container helped partially (it worked longer, but still sometimes the disks were stuck). Finally
I got rid of it only by installing a normal square quartz (before that
the “boat”
was a known crap).

Oh, that’s right, but it’s better to make +12 volts out of +5.
Then in some computers you can even get by with only a 5V source.

EM>>> Wow. I also have to cool it... When it works for 20-30 minutes without
EM>>> cooling, it immediately starts to screw up the disks when recording.
ET>> means it’s buggy :(
AN> Hardly. :) It’s something with the main board. I've changed the VG-Eyki a hundred times already.
AN> :)
hmm... sorry!
I have a Pentagon and there was a glitch with the VG-Eyka overheating - I replaced it and that's fine!
it's a pity they are dear :(

AN> Sincerely, Alex Noman.

22:37 15.Aug.1999 Always yours Point777

Please note, Alex from FFC COMPUTERS.

>E-MAIL: asde...@softhome.net ICQ: #13064553

exactly like that. and it couldn’t be easier to implement - just KREH5A. and there is no need for a radiator, because it doesn’t heat up at all.

RM> Oh, that’s right, but it’s better to make +12 volts out of +5 volts.
RM> Then in some computers you can even get by with only a 5V source.

IMHO, many use standard power supplies from PC, Pravets, Agate, etc.

Best wishes, Artur. [ZX]

I'm sorry for interfering with your conversation, but what then should I use to power the drive? Let's say
I quite rarely came across 3'5 drives that didn't require +12V, but I haven't seen such
5'25 drives.

... Until the next connection!

RM>> The VG-shka is more afraid of the lack of +5V when 12 are supplied!
WB> Isn’t it easier to assemble a stabilizer on one 815, which
WB> would supply the VG with only 12 volts, and make 5 yourself?

RM>> 5V source.
AG> I apologize for interfering with your conversation, but what then
AG> is used to power the drive? Let's say I quite rarely came across 3'5
AG> drives that didn't require +12V, but I haven't seen such drives for 5'25
AG>.

People talk about the VG's power supply so that both 5 and 12
volts are always present on it...
Anyway, both 5 and 12 are required in any case, you can't get away from it... ;))

With best wishes, Dmitry.

[ZX] [LETI]

One day, 17 Aug 99 22:56:00, Alexey Goloschapov wrote to Roman Milukov

AG> I apologize for interfering with your conversation, but what then should I use to power the drive?
AG> Let's say I quite rarely came across 3'5 drives that didn't require +12V,
That means they were old drives, new three drives (somewhere after the 97th release) don't
require +12V

WBR, Sergey! [ZX]
mailto: dr.g...@usa.net
http://www.ascendancy.homepad.com

WB>> which would supply the VG with only 12 volts, and do 5 volts yourself?

AL> It’s easier to use KREH5 for this.

Well, yes, of course. I just proposed the principle...

Sincerely, Wladimir

13 Aug 99 12:13, Alex Letaev -> Wladimir Bulchukey:

WB>> With 4 drives only SONY is capable of writing,
WB>> the other three drives, even Epson, become
WB>> "read-only".

AL> Try Conder-ceramics about 0.5uF on IP VG93 and on minus.
AL> You might be pleasantly surprised. :-)

I'll try... for the next flight. ;-)
Now, when it’s not hot, the computer can work for days without failures.
Or I’ll install a cooler. :)

Sincerely, Wladimir