Scorpion & write — ZXNet «real.speccy»

From Roman Gremiako To All 12 November 2000

_hey, All !_

My subject suddenly stopped writing to discs. Everything seems to be ok with the WRPT signal. WRDAT from VGshki is formed through 555IR16, and then 555L5. I replaced IR16.
Instead of 555L5 there is 155L3 on the board. The computer reads discs reliably, but does not write. The VGshka is known to be in good working order. Tell me what to change where?? PLZ!!

_bye, All!_ Roman Gremiako, Sunday, 12 November 2000, 14:39.

... Now playing: _silence_ (Winamp is not active)

From Felix Knyazev To All 15 November 2000

Greetings, Roman!

[Sunday 12 November 2000] at [14:39:12] Roman Gremiako wrote a letter to
All.
They discussed the topic "Scorpion & write". Let's continue what we started...

RG> My subject suddenly stopped writing to discs. With the signal
RG> WRPT everything seems to be ok
RG> ok.

How did you check?

RG> WRDAT from the VGshka is formed through 555IR16, and then 555L5.
RG> I replaced IR16.
RG> Instead of 555L5 on the board there is 155L3. The computer reads discs
^ ^
Q: Can you do this: HHHH ?
A: yes.

:) LH3, LH5? I checked the D69.3?

RG> is stable, but the recording does not
RG> work.

TR-DOS, for an hour, does not swear 'Write Protect'?

RG> The VGshka is obviously good. Tell me, where
RG> should I change?? PLZ!!

Check also the passage of all timing pulses on IR16 and the circuit from the 30th leg
VG93 -> D69.4 -> to the interface connector. Check the cable.

Best regards, Felix.

[I ZX]

From Roman Gremiako To All 16 November 2000

RG>> I replaced IR16. Instead of 555L5 there is 155L3 on the board. The computer reads discs
FK> ^ ^
FK> Q: Can you do this: HHHH ?
FK> A: yes.

Winda 2k is a mustdie. Now I know =) HHH!

FK> :) LH3, LH5? Have you checked D69.3?

Not yet, because... no LH5 available. In general, how do LH5 and LH3 differ from each other? And
is it possible for LH5 to replace LH3 in this case?

RG>> stable, but recording does not work.
FK> TR-DOS, for an hour, does not swear 'Write Protect'?

No.

From Alexandr Kushnikov To All 16 November 2000

RG> is coming. The VGshka is known to be in good working order. Tell me, where
RG> should I change?? PLZ!!

The inverter may have died (the most angular m/cx on the board).

Sincerely, Alexander Kushnikov aka Sander.

From Dmitriy Nesmachny To All 18 November 2000

RG> I replaced IR16.
RG> Instead of 555L5, there is 155L3 on the board. The computer reads
RG> discs stably, but does not
RG> write. The VGshka is known to be in good working order. Tell me, where
RG> should I change?? PLZ!!

From Felix Knyazev To All 18 November 2000

RG> Not yet, because... no LH5 available. In general, how do LH5 and LH3 differ from each other? AND

Both with an “open collector” (OK) type output. They differ in the maximum
voltage at the collector (output). I'm not sure, but it is possible that LH3 is more
powerful (it can remove more current log.0).

LH3 - 5V
LH5 - 15V

RG> is it possible to replace LH5 in this case with LH3?

Easily. It will be even better.

From Alexandr Kushnikov To All 20 November 2000

Greetings, Roman

Thu 16 Nov 2000 at 18:43:43 Roman Gremiako -> Felix Knyazev on the topic of Scorpion &
write

FK>> :) LH3, LH5? Have you checked D69.3?

From Roman Gremiako To All 23 November 2000

RG>> is coming. The VGshka is known to be in good working order. Tell me, where
RG>> should I change?? PLZ!!
DN> Try to look at the schedule on VG. I had similar problems,
DN> were cured by replacing the TM2 with which the clock was supplied.

tnx!! There was something wrong with her. Now everything is ok!

_bye, Dmitriy!_ Roman Gremiako, Thursday, 23 November 2000, 14:39.