Re: Tech help- Gottlieb System 1 power supply

From: Mark Clayton <spamuser1604@xxxxxxx>
Date: Sun, 31 May 2009 17:42:59 -0400

For testing, you can remove SCR101 and see if that
fixes the problem. The SCR is used to short circuit
the power and blow the fuse in case of regulator overvoltage.
Next check the voltage across C1 for about 14 VDC and then check
CR1 and CR2 rectifier diodes.

-Mark
-----
http://pinballpal.com

kactussjack wrote:

I am getting 2.4V instead of 5V. I have replaced Q1 & IC1 with no
change. I thought I saw a post here where someone changed out
SCR101which fixed the same problem. Can anyone point me in the right
direction?
Thanks.

References:
- Tech help- Gottlieb System 1 power supply
  - From: kactussjack

Prev by Date: Re: Bobby Orr playfields always worn, why!
Next by Date: WTB: DEMO MAN PLASTIC #31-1919-6
Previous by thread: Tech help- Gottlieb System 1 power supply
Next by thread: Bobby Orr playfields always worn, why!
Index(es):
- Date
- Thread

Relevant Pages

Re: Replacing an old SCR
... It wasn't bvious to me that the OP considered latching on to be the ... That's measuring across the SCR. ... in both the good and bad power supplies. ... Even though a possible higher holding may exist in the older units, I still think you have an issue with that circuit. ...
(sci.electronics.design)
Re: Question on Konica/Minolta 1350W Laser Printer
... To determine the MAXIMUM amount of power that can be drawn on ANY ... circuit is to take a note of the supply voltage and the fuse rating ...
(comp.periphs.printers)
Re: LED smoothing question
... or between the bulb and the voltage going to it, ... circuitry that's sending the power to the bulbs. ... If it's a SCR as you said maybe they do that by skipping half-waves unless it's a dimmer circuit. ...
(sci.electronics.design)
Re: RCA 32V434 Dead set
... have checked the fuse. ... When first plugged in you can hear a relay click ... and if you press the power button the power light flashes on and off ... Check for a shorted component in the HV circuit for a start. ...
(sci.electronics.repair)
Re: EM TECH: I shouldnt have done this, but not sure why
... The lamps didn't blow - the fuse blew and that turned off power to all ... When you replace the fuse, the lamps should come back on. ... This means that the electrical circuit goes through ... each lamp, one after another. ...
(rec.games.pinball)