8mm Forum: Fumeo X900 Sound problem

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Topic: Fumeo X900 Sound problem

Robert Tucker
Jedi Master Film Handler

Posts: 688
From: Essex, UK
Registered: May 2005

posted August 13, 2007 04:58 AM

Wonder if anyone can help on this one? It seems I have a problem with the sound on my Fumeo x900 Pedestal projector. It seems I have a problem with the sound going up and down by it's self. I run the projector and shortly after the sound goes down so I have to turn the volume up to 10 to keep it at a audio level. I have had all the module boards checked apart from the EQ board and exciter lamp power module board. The same problem happens even if I don't use the built in amplifier in the projector and use the pre amp out line socket to be plugged into a separate amplifier.

The only other problem i get is when i switch on the projector i hear a lot of fuzz hiss from the built it projector speaker, just for a few seconds.

If any one can help me in finally pin pointing the problem i would be most grateful.

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John Whittle
Jedi Master Film Handler

Posts: 791
From: Northridge, CA USA
Registered: Jun 2003

posted August 13, 2007 11:03 PM

Watch the exciter lamp--put a multimeter on it and look for a voltage flucation. Other possible causes are a bad capacitor in the pre-amp or a bad contact (which would explain you fuzzy static). Also look for a voltage problem on the pre-amp as well since a voltage drop will produce a similar problem if all the feed lines are dropping in voltage. Make sure you line voltage isn't dropping as well since a transformer will multiply a voltage drop (i.e. 120 to 12 volts is 10 to 1 so a drop to 100 volts means the transformer puts out only 10 volts, etc).

John

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Robert Tucker
Jedi Master Film Handler

Posts: 688
From: Essex, UK
Registered: May 2005

posted August 14, 2007 03:34 AM

Thanks John for your valuable advice, and it's good to know some one who knows the machine inside out. It seems from checking out the problem i have a feeling it will be the capacitor that is at fault. I am assuming that the pre-amp module is the EQ board on the front of the machine next to the volume/bass/treble module board?

Or is it located at the back where i will have to replace the capacitor myself as it is not on a module board?

If you could confirm this for me i would be most grateful.

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Kevin Faulkner
Film God

Posts: 4071
From: Essex UK
Registered: Jun 2003

posted August 14, 2007 07:18 AM

Robert, refresh my memory...while I was with you repairing your GS did you tell me that the Fumeo volume returned or does it stay low till the next time you turn off and on?

Kev.

--------------------
GS1200 Xenon with Elmo 1.0...great combo along with a 16-CL Xenon for that super bright white light.

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Robert Tucker
Jedi Master Film Handler

Posts: 688
From: Essex, UK
Registered: May 2005

posted August 14, 2007 08:06 AM

Hi Kevin,

Good to hear from you!

Not sure if you have been receiving my emails as i have had no reply to you? I guess you've been very busy.

In realtion to the sound it seems it goes up and down but never really stays the same for the duration of showing a feature. When first switched on if you are showing a short (10-15min) if you are lucky enough it will behave it's self but this is very rare.

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Kevin Faulkner
Film God

Posts: 4071
From: Essex UK
Registered: Jun 2003

posted August 16, 2007 03:51 AM

If its varying it could be a bad connection. I dont know the Fumeo electronics but I take it the panels plug into edge connectors?

If they do it's worth checking that none of the contacts are tarnished. Use switch cleaner on them.

Do you have the circuits for this machine? I could bring my meter over to see if there is anything varying.

Does the machine have an aux, mic or line input? if yes, have you tried putting an external sound source through it to see if the problem is still present?

Yes I have been up to my eyes just recently. I haven't seen any emails from you though. I will check my spam filter.

How's the GS running?

Kev.

--------------------
GS1200 Xenon with Elmo 1.0...great combo along with a 16-CL Xenon for that super bright white light.

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Robert Tucker
Jedi Master Film Handler

Posts: 688
From: Essex, UK
Registered: May 2005

posted August 22, 2007 06:33 AM

Hi Kevin,

Thanks for offering to take a look at my machine, but I think you have really done enough already for me which I am most grateful for. Yes the GS is working fine and I plan to start using it for this winters screening’s.

If the offer is still available, I would like to take the opportunity in borrowing your crystal sync machine. So I can re-record the feature of Grease in Stereo and give it the impact it deserves.

Yes the panels do plug into edge connectors. I have checked all the contacts and cleaned them with switch cleaner. But I think I have narrowed down the problem to the pre-amp\exciter power panel board module. The board seems to be very hot to one side, which means that maybe a capacitor has dried out or gone?

I plan to send this off to Fumeo, which are based in Brighton so they can hopefully resolve the issue of the sound once and for all.

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John Whittle
Jedi Master Film Handler

Posts: 791
From: Northridge, CA USA
Registered: Jun 2003

posted August 22, 2007 07:01 PM

Robert,
Resistors are the things that get hot, especially when too much current is being pulled thru them. Sounds likely there is a problem in the DC voltage regulation circuit for the exciter lamp or possibly the pre-amp. I'd look at the exciter lamp since these generally have to supply 4 amps or so at 4 to 6 volts with very stable voltage and current. A bad regulator, zenor diode or what ever means they've used, could be the bad part. You might be able to track this down with a good schematic and a volt-ohm meter.

John

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Kevin Faulkner
Film God

Posts: 4071
From: Essex UK
Registered: Jun 2003

posted August 23, 2007 07:59 PM

The thing is Robert, it may be a power supply problem and not on one of the plug in boards.
John is right in that if heat is involved it would probably be a resistor and most likely a dry joint round a hot resistor.
I don't mind coming over to check this out for you especially as your hospitality is GREAT [Wink]

and its only 20mins drive for me on the Kwaka!
How much is it costing you to keep sending these boards off to be checked by the UK agent?

Do you have schematics for this machine?

Kev.

--------------------
GS1200 Xenon with Elmo 1.0...great combo along with a 16-CL Xenon for that super bright white light.

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