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Topic: Repairing a Sankyo Stereo 800 - The Journey

Lee Mannering
Film God

Posts: 3216
From: The Projection Box
Registered: Nov 2006

posted June 13, 2013 03:41 AM

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Hi Janice. I had one of these way back when they were new and was problems from the start out of the box. Dry solder joints on the motor speed control circuit board and eventually the micro switches packed in which are located left and right behind the main control knob. I would start by changing the two micro switches you can see which is a fiddly job but my money would be on them and probably the one to the right.

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Janice Glesser
Film Goddess

Posts: 3468
From: Sunnyvale, CA USA
Registered: Sep 2011

posted June 13, 2013 11:12 AM

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Thanks Lee for the advice...and Pete, I'm going out of town this weekend to visit family and celebrate Father's Day with my step dad. I'll be back on Monday. I will have my laptop with me..so if you post a test I should do...I'll do it when I get back.

[ June 15, 2013, 03:04 AM: Message edited by: Janice Glesser ]

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Janice

"I'm having a very good day!"
Richard Dreyfuss - Let It Ride (1989).

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Janice Glesser
Film Goddess

Posts: 3468
From: Sunnyvale, CA USA
Registered: Sep 2011

posted June 17, 2013 08:27 PM

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Pete...I'm back home now and ready to work on the projector. Were you going to guide me through some testing? I just want to make sure this time that I'm clear on the components I'm suppose to be testing:) I will probably verify by posting a photo. I also need to test to hopefully identify what blew out this last time.

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Janice

"I'm having a very good day!"
Richard Dreyfuss - Let It Ride (1989).

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Pete Richards
Master Film Handler

Posts: 302
From: Australia
Registered: Sep 2010

posted June 17, 2013 10:58 PM

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I'll take a look at it tonight (Australia time) and write something up for you.
Cheers
-Peter

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Janice Glesser
Film Goddess

Posts: 3468
From: Sunnyvale, CA USA
Registered: Sep 2011

posted June 24, 2013 03:08 PM

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Hi Pete...I PM'd you. When I blew out the sound on my last testing...could this have blown a fuse. I don't see any tube type fuses on this machine, but Steve says it has to have fuses. Where are they?

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Janice

"I'm having a very good day!"
Richard Dreyfuss - Let It Ride (1989).

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Pete Richards
Master Film Handler

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From: Australia
Registered: Sep 2010

posted June 24, 2013 03:47 PM

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Sorry Janice, I haven't forgotten you, I unexpectedly ended up away from home until this morning.

Circled in red is the fuse on that board, it is next to the huge capacitor. Make sure the projector has been turned off and disconnected from the power for a few hours at least to let the capacitors discharge so they don't zap you!

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Janice Glesser
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From: Sunnyvale, CA USA
Registered: Sep 2011

posted June 24, 2013 06:50 PM

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Interesting Pete...Looks like Sankyo made some design changes on these machines. Take a look back at my photo posted on June 7th. No fuse...just a wire [Confused]

[Confused]

...and your capacitor looks shorter to me.... but maybe not [Roll Eyes]

[Roll Eyes]

[ June 24, 2013, 10:37 PM: Message edited by: Janice Glesser ]

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Janice

"I'm having a very good day!"
Richard Dreyfuss - Let It Ride (1989).

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Pete Richards
Master Film Handler

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From: Australia
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posted June 24, 2013 11:26 PM

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The capacitor is the same size. Someone may have replaced the fuse with a wire at some point. Not good!
I can get the meter out the day after tomorrow and record some test points for you to follow along with, I'll video it if I can.
Just remember to be careful, there is 220v kicking around!
You might want to get a pair of multimeter leads with hooks on the end, like these
http://www.ebay.co.uk/itm/2-2-Long-Meter-Multimeter-Lead-Wire-Testing-Hooks-Clip-Blue-2-Pcs-/290913239550?pt=UK_BOI_Electrical_Test_Measurement_Equipment_ET&hash=item43bbc7c1fe
It makes it easier to avoid short circuits.

[ June 25, 2013, 12:37 AM: Message edited by: Pete Richards ]

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Janice Glesser
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From: Sunnyvale, CA USA
Registered: Sep 2011

posted June 25, 2013 10:49 AM

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Great Pete...I'll see if I can pick up those hooked probes at Radio Shack today.

*Got them*... These are great...wish I had had these before...much safer. I WILL be careful though. [Wink]

[Wink]

[ June 25, 2013, 02:11 PM: Message edited by: Janice Glesser ]

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Janice

"I'm having a very good day!"
Richard Dreyfuss - Let It Ride (1989).

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Janice Glesser
Film Goddess

Posts: 3468
From: Sunnyvale, CA USA
Registered: Sep 2011

posted June 25, 2013 02:53 PM

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I noticed Pete that you have the speaker wires disconnected in your photo. It would be nice to not have the back cover attached to give easier access to the components. Does the connector remove as one piece by just lifting it up? I don't want to mess with it unless I know more about how it's connected.

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Janice

"I'm having a very good day!"
Richard Dreyfuss - Let It Ride (1989).

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Pete Richards
Master Film Handler

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From: Australia
Registered: Sep 2010

posted June 25, 2013 07:43 PM

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Yes, you can just unplug it.

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Janice Glesser
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Posts: 3468
From: Sunnyvale, CA USA
Registered: Sep 2011

posted July 02, 2013 03:11 PM

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Frank Arnstein's comment from another thread:

quote:
I think there is a small hidden glass line-fuse inside the wiring loom, somewhere behind the power socket. Its covered in black plastic tubing so you will need to cut it out when you find it. Also check the motherboard visually for burnt out printed circuitry.

I'll look for the fuse Frank. I may have blown that with my failed testing incident.

I want to gather as much information before I take it to an electrician. I'm sure most haven't seen a film projector circuit board before [Roll Eyes]

[Roll Eyes]

UPDATE: Frank other than the fuse location Pete shows in his photo, which is missing on my machine...I don't see another fuse anywhere...and nothing in the power socket area.

[ July 02, 2013, 06:44 PM: Message edited by: Janice Glesser ]

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Janice

"I'm having a very good day!"
Richard Dreyfuss - Let It Ride (1989).

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Pete Richards
Master Film Handler

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From: Australia
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posted July 03, 2013 07:34 AM

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Just going over the projector now with the meter to follow the path of the power and come up with some test points for you. Sorry it has taken so long, I unexpectedly lost both Grandmothers within days of each other, it has been an up and down week.

First thing to check is that power is getting to the main board. With the power cord *disconnected* open up the projector, and lay it down carefully so that the front is face down on the table. Check the bottom of the green PC board for any scorch marks or damage. If it is clean then attach your test probes to the bottom of the board where the 15V AC comes to the board. On mine the wires are Orange and black. Set your voltmeter to AC voltage (~) and if it is not autoranging, set it to above 200V in case there is a short.
Apply the power and the voltmeter should read approximately 15V AC. It doesn't matter which way around the probes are.
If that voltage isn't present, then either there is a hidden fuse, or the main transformer is burned out, or one of the wires has burned out. It is a good first place to check.

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Janice Glesser
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From: Sunnyvale, CA USA
Registered: Sep 2011

posted July 03, 2013 12:15 PM

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This doesn't look good to me Pete...and no voltage reading. What do you think?

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Janice

"I'm having a very good day!"
Richard Dreyfuss - Let It Ride (1989).

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Akshay Nanjangud
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Posts: 637
From: Dallas, TX
Registered: Nov 2011

posted July 03, 2013 02:38 PM

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Janice, I had similar issues on my ST-1200 PCB ..... only worse. So I got a friend and we soldered wires where we felt the connections had corroded. Take a look at the image here: Link. I can reply with more details, if you want.

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Pete Richards
Master Film Handler

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From: Australia
Registered: Sep 2010

posted July 03, 2013 09:39 PM

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Well... I guess the good news is that we know one reason it isn't powering up!

Before soldering anything, put the test probes on the points I have circled and we can see if the 15V is getting to the board at all.

If those test points show 15V AC, then it is easy to solder a wire in place of the burned out PCB track. I'm 99sure that you will still have no voltage there though.

If no voltage is showing, then we need to physically trace the wire on the right-hand-side (the black one) and see where it goes and if there is a fuse hidden along it somewhere, or if the wire itself has burned out.

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Brian Stearns
Master Film Handler

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From: Lexington
Registered: Jun 2013

posted July 03, 2013 10:14 PM

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What a nightmare, Its always a risk buying projectors on ebay. good luck Janice

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Pete Richards
Master Film Handler

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From: Australia
Registered: Sep 2010

posted July 04, 2013 08:01 AM

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If the Transformer is okay, then anything else is a relatively cheap fix. Don't lose heart!
The likely culprits will be the Toshiba 1B2Z1 rectifier (green oblong thing behind the power input) or the filter cpacitors.

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Janice Glesser
Film Goddess

Posts: 3468
From: Sunnyvale, CA USA
Registered: Sep 2011

posted July 04, 2013 11:22 AM

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Pete...do you have the schematics? The black wire leads directly to the transformer. According to the schematics it should go to a fuse first ... but there is no fuse. It's strange that this machine looks hardly used, but has so much damage.

I'm taking a break today to celebrate Independence day by going to a 4th of July BBQ [Smile]

[Smile]

Let me know what else I need to check...I'll do it tomorrow.

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Janice

"I'm having a very good day!"
Richard Dreyfuss - Let It Ride (1989).

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Pete Richards
Master Film Handler

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From: Australia
Registered: Sep 2010

posted July 04, 2013 06:11 PM

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Ah, we live in the future here, it is already the 5th [Smile]

[Smile]

Are you sure the wire goes straight to the transformer? On mine it looks like it does, but actually doesn't.
The wire is encased inside a black plastic 'shroud' and hidden inside that is the fuse. I don't have the schematics unfortunately.

The next thing to check *with the power disconnected* is to trace the wires from the back of the power socket to the transformer and check if they are damaged or if there is an in-line fuse that has blown.

Maybe a few of us 800 owners could share in the cost of one of these:
http://www.ebay.com/itm/Sankyo-Stereo-800-Projector-Repair-Manual-/400355933260

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Akshay Nanjangud
Jedi Master Film Handler

Posts: 637
From: Dallas, TX
Registered: Nov 2011

posted July 04, 2013 08:04 PM

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The ST-1200 Repair Manual was very useful while working on my PCB. It gives voltages at almost all points, so we could identify the ones that needed soldering. Helped finish the job in one night. Here, we have a back-and-forth across continents, so it is going to take time. Nevertheless, this is an invaluable thread.

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Janice Glesser
Film Goddess

Posts: 3468
From: Sunnyvale, CA USA
Registered: Sep 2011

posted July 05, 2013 01:46 AM

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That manual was on sale last week for $15 :-(...I almost bought it...now I'm kicking myself. However Pete, I have the schematics that Maurizio Di Cintiot scanned and sent me and I can email them to you if you like. Maybe he has the whole manual too.

I want to make sure I'm checking the correct wires for the fuse. I cut back some of the tubing enough to slide it back and forth on the wires. There was no fuse in this section of wires.

As far as checking the wires from the socket to the transformer...that's a bit tricky. I guessing I have to take off that section of the chassis to get a good view of the wires. With a flashlight some of the wires going into the top of the transformer don't look just right...but it's such a small opening it's hard to tell for sure.

I see 4 screws that are holding the chassis in place. I can remove these screws and I'll probably have to remove some wiring that is cable tied to the chassis. What do you think?

Is there a way I can test if the transformer is getting any power?

--------------------
Janice

"I'm having a very good day!"
Richard Dreyfuss - Let It Ride (1989).

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Pete Richards
Master Film Handler

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From: Australia
Registered: Sep 2010

posted July 05, 2013 06:10 AM

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There sure is. See the Red and yellow wires going to the Switch on the far right in your photo (The 'H' switch for the lamp).
Disconnect the power and then pull the red and yellow wires off the switch. Set your meter to AC Volts and place the red probe into the red wire (You should be able to poke it in the end of it into the spade connector). Connect the black probe to the metal chassis of the projector.
Plug the projector in and check the voltage on the meter. It should be around 11V AC on the red wire. Leave the black probe connected to the chassis and stick the red probe into the yellow wire. There should be about 9V AC on the Yellow wire. (Mine are 11.3 and 9.3 respectively). If there is nothing on those, then check that the power cable to the projector is working by using it (and the same wall socket) on another device like an electric kettle or a computer as they usually use the same shape plug. If the power cable and wall socket are OK but the voltages are zero, then the transformer is blown or the wires from the AC socket to the transformer are faulty.

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Janice Glesser
Film Goddess

Posts: 3468
From: Sunnyvale, CA USA
Registered: Sep 2011

posted July 05, 2013 12:53 PM

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Well...this projector is reading a BIG ZERO...I think a zombie is more alive [Roll Eyes]

[Roll Eyes]

So Pete you are saying it could be the transformer or the wires. Then my totally uneducated guess is the wires. Since the light did work before I blew out something. Is it an all or nothing situation where the transformer either works or it doesn't? OR can some parts work and others not? ... i.e. power gets to the lights through the transformer...but not to the motor?

Is there a possiblity I blew the transformer, since I can't seem to locate any fuses?

[ July 05, 2013, 04:57 PM: Message edited by: Janice Glesser ]

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Janice

"I'm having a very good day!"
Richard Dreyfuss - Let It Ride (1989).

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Pete Richards
Master Film Handler

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From: Australia
Registered: Sep 2010

posted July 05, 2013 07:55 PM

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A few ways to find out. Easiest first, from you location I am guessing you are on 110v?

The power goes into the projector via the power socket. From the back of the socket there is a blue wire that goes straight to the transformer, and a brown wire that goes into the Round Voltage Selector. Various wires come out from the voltage selector to the transformer depending on the selected voltage.

So one thing to try, if you are on 110V, remove the pwer cable, then remove voltage selector disc by pulling it straight up, and change the voltage selection to 117V. This would cause the projector to run at the wrong speed but won't damage anything.
Do that then test your voltages again. This will at least check if the wire from the back of the voltage selector to the transformer has burned out. (also check the volatge selector disc for signs of damage when you remove it).

If there is still no voltage present, then remove the power cable. Undo the two screws holding the power socket in, and the two screws holding the voltage selector. You can now pull both of these up to inspect the wires behind them and look for damage.

My projector is now in pieces everywhere too!

If you can't see any damage then we can check for continuity by testing from the power socket to the centre pin of the voltage selector, and from the earth pin to the projector chassis.
Set you multimeter to continuity (or beep mode if it has it) or to OHMS to check for resistance. Put the probes as per the photos and the multimeter should beep or show almost zero resistance. That will tell us if two out of the three wires are okay from the power socket to the transformer.

Testing the brown wire continuity

Close-up:

Testing the earth continuity

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