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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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