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IZ3LSV

[San Dona' di P. JN]

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G8MNY  > TECH     17.03.09 08:14l 44 Lines 2050 Bytes #999 (0) @ WW
BID : 20705_GB7CIP
Read: GUEST
Subj: HITACHI V-1050 SCOPE info?
Path: IZ3LSV<IK2XDE<F5GOV<F4BWT<GB7COW<GB7CIP
Sent: 090317/0015Z @:GB7CIP.#32.GBR.EU #:20705 [Caterham] $:20705_GB7CIP
From: G8MNY@GB7CIP.#32.GBR.EU
To  : TECH@WW

By G8MNY                                (New Mar 09)
(8 Bit ASCII Graphics use code page 437 or 850)
Hi & thanks for reading,
      I bid for this faulty 100MHz dual beam scope at a club junk sale & won it
for only œ1.50.                          ÚÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄ¿Btrig
                                         ³³~~~~~~~~³ o' o      ,ø ³ CH4
It came with no handbook so I had        ³³        ³ o  :  (O)  o ³
to fault the "no display" problem        ³³        ³ ù (o)  o   o ³
blind. I found a short circuit 22V       ³³________³ o  ú  --  -- ³
zener in the complex brilliance          ³=                    -- ³
circuit, & I also replace the EHT        ³  (o)  o.     (o)  = -- ³
shroud that was missing, obviously       ³o    .o ù|ù o.     o o o³Atrig
someone had been there & gave up on it.  ÀÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÙ CH3 
                                         CH1               CH2 Earth

There was also a poor blanking fault & the brilliance altered the focus a bit.
This proved to be a PNP again on the EHT unit, a grounded base transistor
blanking amp that was a short & had no gain, hence the current drain on the
supply to alter the brilliance & defocus.

Well it now works quite well all calibrations OK, but I also found there was a
fault in the dual timebase mode control, as there seems to be no difference
between A timebase & A intensified with B timebase. Tracing the mode track from
the switch via diode gates, the his proved to be a failed plated through hole,
that needed bridging solder both side of the PCB tracks on the trigger board,
it must have been like that since new!

I found it can display 4 100MHz wide channels (using the trigger monitoring) &
with the 2 timebases this give a total of 8 mind blowing traces.

The 107 page handbook & diagrams was available in compressed RAR form from the
Hitachi web site.

Any other information on this old piece of quality testgear would be very
welcome.


Why don't U send an interesting bul?

73 De John, G8MNY @ GB7CIP


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