RE: 25" Amplifone (Star Wars cockpit) repair help

Start w/ the easy stuff:

 - Replace all the zero-ohm jumpers (on both the deflection and HV
board) w/ jumper wire.

 - Check all the solder joints on both boards for cold/broken joints --
resolder as necessary.

 - Check all the soldered connector wires going to the HV board.
Resolder as necessary.

 - Check the MC1 for visible damage.

 - If not already installed, install the HV two resistor upgrade.

 - If not already installed, install the HV 4 diode upgrade.

 - Disconnect the BU406D per the faq so that you won't be generating HV.

 - Test the input and output voltages at the regulators. Inputs should
be around +/- 30v (up to +/- 33 is ok), outputs should be +/- 24. If
not, replace the defective regulator.
http://www.classicade.com/amplifonetestpoints.jpg

 - I'd replace the BU406D w/ a new part, just to be safe.

 - Visually inspect the other transistor cases on the HV board for
bursting or apparent damage -- replace as necessary.

At this point, you should be to the point that you can swap in the new
HVT w/o too much worry.

> -----Original Message-----
> From: owner-vectorlist@synthcom.com
> [mailto:owner-vectorlist@synthcom.com] On Behalf Of Gregory Erway
> Sent: Tuesday, March 5, 2002 6:20 AM
> To: Vector List
> Subject: VECTOR: 25" Amplifone (Star Wars cockpit) repair help
>
>
> First of all I am new to the list and just found it
> yesterday. So if I post incorrectly please forgive me and
> nicely tell me what I did wrong and I will be glad to try to
> follow any rules I am not now aware of.
>
> I have been trying to get together with a friend to work as a
> team to repair my 25" Amplifone monitor that has been dead
> ever since I picked up my Star Wars cockpit 9 months ago.
> Tomorrow (Wednesday 3/6/02) is the day. Neither of us has
> experience with Amplifone monitors. My friend however did
> repair his Star Wars UR WG monitor as well as his Tempest WG monitor.
>
> I have the following items on hand and ready to be used if
> needed: 1 New Wintron HV unit (purchased last August $190)
> BU406D Yes there is a "D" on them Qty:27 just in case ;-)
> 120v AC fan (#CSA8038AC the one recommended in the Amplifone
> HV Guide) Zanen cap kit (note: Not the upgrades recommended
> in the Amplifone HV Guide) 511-L7824CV STM voltage regulators
> (1.5A 24v) from Mouser Qty:5 511-L7924CV STM voltage
> regulators (1.5A 24v) from Mouser Qty:5 TO-3P mica insulators
> from Mouser (will probably have to trim these) TO-220 mica
> insulators from Mouser 585-1N4001 rectifiers from Mouser
> (do-41 1A 50prv) Qty:10 599-SK3199 NPN AF MD PWR from Mouser Qty:2
>
> I have a DMM.
> I also have purchased a HV probe (used from a friend).
> I DO NOT have a ringer to test the old "red is dead" HV unit.
> I have a working SW boardset (tested in a friends UR) and I
> have the origional 1/2 working boardset that came in the
> cockpit (tested in a friends UR).
>
> When I got the machine we turned it on and found no picture.
> There is however "clicking" going on in the neck of the tube.
> No LEDs are turned on on any of the monitor boards. There is
> a small 1/8" or so phos burn in the center of the screen. The
> HV unit is RED. The HV board and deflection board are Beige.
>
> I was all set to do this tomorrow night when I found the
> vector list and read a few posts I could find in the archive
> on the Amplifone. I started to get really worried when I saw
> a few posts mentioning brand new Wintron HV units that died
> when adjusting focus and brightness. Now I'm worried. What if
> anything am I missing? I don't want to take any chances
> blowing up my new HV unit. It would just about crush me to
> have that happen after finally getting all worked up for this
> job. Should I just replace every single component I listed
> above reguardless if those parts test good or bad?
>
> I do not have a scope to check the wave form at the base of
> the BU406D as listed in the Amplifone HV Guide by Michael
> Kelley 6/9/1999.
>
> I also noticed some discussion on the topic of what the HV
> should be set at for the 25" tube. 19,500 is the listed value
> in the HV Guide but I read the
> start of some discussion that this was for the 19" and the
> 25" maybe should
> be
> different. Unfortunatly the Vector List archive doesn't seem
> to have anything since mid 2001 so I may have missed the answer.
>
> Any helpful information and encouragment is greatly appreciated.
>
> Thanks
> Greg
>
>
> ______________________________________________________________
> ________________
> Gregory Erway
> (585) 924-7550 (work)
> gerway@redcom.com (work)
> (585) 398-2672 (home)
> erway@rochester.rr.com (home)
>
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> Tapper World Champion - 1,263,625 6/3/01 (Tournament Rules)
> Rootbeer Tapper World Champion - 1,959,200 7/29/86
> (Marathon Rules)
> M.A.C.H. 3 - Bomber Third-Place Champion - 353,200 3/22/86
> (Factory Default)
> 2001 Funspot/Twin Galaxies Classic Video Game World
> Championships 8th-place
>
> Arcade Collection:
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>
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Received on Tue Mar 5 08:09:01 2002