RE: Atari B&W: no HV

Conceptually, you want to discharge the CRT to itself, without any
intervening circuitry. Proper discharge is from the CRT second anode to the
DAG.

Discharging from the second anode to the chassis or frame ground will
introduce the monitor circuitry into discharge path, therefore possibly
resulting in consequential circuit damage. Note that HV diode damage is not
the only component that can be damaged by discharging through chassis
ground.

  ----Original Message-----
  From: owner-vectorlist@synthcom.com
[mailto:owner-vectorlist@synthcom.com]On Behalf Of Mark Shostak
  Sent: Thursday, December 6, 2001 2:56 PM
  To: vectorlist@synthcom.com
  Subject: Re: VECTOR: Atari B&W: no HV

  I'm curious how shorting the anode to the chassis will damage the HV
rectifier.
  (Assuming the unit is powered down at the time of the short).

    ---->>>Remember: NEVER, EVER EVER SHORT A B&W HV ANODE TO THE
CHASSIS!!!!!!!!!!!<<<----

     You must use a HV meter or a series of 1 meg resistors (total 10Meg
insulate the suckers!) to discharge the HV anode on the side of the tube.
This is what is killing the HV diodes, getting the anode shorted by a jumper
wire to the chassis common...

    John :-#)#

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Received on Fri Dec 7 11:39:21 2001