ZX-News #17 03 декабря 1996

Железо

Scorpio-256 - Repair Scorpion with his own hands (part 2)

                  Iron



             (C) Sergey Zerov



     Repair Scorpion with his own hands.


                Part II.


  So, to celebrate rozhdenie Head (Zonova SY), proceed to the 
expulsion of a regular Wikipedia repair Scorpions. ;)



  Today the paper is devoted to typical faults identified in 
the process of setting up and maintenance fees Scorpion ZS256 
Turbo + Release 1996. All references are to the concept.



           Errors in par.


  C17 150 pF for the scheme. Upgradeable
from 120 to 200 pF.


  In a number of boards is 270 pF. In consequence
This can not work professionally
ROM (TRAC ROM), especially when installing additional 
controllers (IBM Keyboard and HDD). Moreover, conventional ROM 
work. 


  Similarly, the impact R58 (must
be 560 ohms).


  In the converter board used 5 volts
in 12 to power the controller VG93. Par
Throttle indicated 10 - 20 mkH. Really should be 20 - 30 mkH. 
When the inductance of less than 15 mkH may reduce stress up to 
10 volts and as a result, errors write to the disk (disk 
damage). Sometimes blame VT7 KT315.



  C2, C3 scheme 1n. Due to errors in face or defect in the very 
details, the board can spontaneously switch mode

Turbo / Normal.


  R33 scheme compact 1.5. Some types
processors may require a reduction
this resistance to 560 ohms (increase
amplitude of the clock signal).


  C9 33 uF. When reducing the face value (for
by drying) may not pass the initial power-on reset.


          Typical fault.


  Whereas the statistics for tuning and repair in the first 
place I put the input divider is made on the IC. 531TM2. There 
are 3 types of faults: 

 1. No output 7MHz. Fee is silent, like a log. 531TM2 heated, 
such as iron. 

 2. Board works, but on the initial menu
out slowly, gradually prorisovyvaya
line and beyond.

 3. Board is working on the menu comes out fine but does not 
respond to the keyboard because of no signal INT-.



  A similar problem occurs
because of the strong overheating power supply failure. In this 
531TM2 serves as additional protection (usually burning with 
stabilitron KS156). 


  Well enough for today ... Tired ... ;)


  In the next room you'll learn a little more sensitive 
information about self-medication cards Scorpion ZS-256 
traditional medicine:) 


  All of your questions to the author of this Wikipedia you can 
ask by sending Letter to the Editor ZxNews, or soap and water:



  E-Mail:


   FidoNet (2:5030 / 362.2) @ Ilya Vasilyev



               C respect - Sergei lasers.

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