Hitachi VT-2200A VCR video drum dead

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Ken1
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Hitachi VT-2200A VCR video drum dead

Post by Ken1 » Sun Apr 14, 2013 8:32 am

Hi, Can anyone suggest why the video head drum won't turn in a Hitachi VT-2200A vcr? The tape loads, then threads and then the vcr shuts down. The video head drum won't even try and turn. When I manually unthread the tape by turning the threading motor back, fast forward, rewind and eject all work fine. Pressing play results in the tape rethreading and then shutdown with no movement of the video head drum. The drum moves freely by hand so it's not seized.

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Externet
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Re: Hitachi VT-2200A VCR video drum dead

Post by Externet » Sun Apr 14, 2013 8:45 am

Check/bypass/disable the humidity sensor, the casette-present optocoupler sensor, tape tension sensor; are coming to mind. It's been too long since playing with those...
Miguel
- Abolish the deciBel ! -

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dacflyer
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Re: Hitachi VT-2200A VCR video drum dead

Post by dacflyer » Sun Apr 14, 2013 11:48 am

other possible cause might be the timing switch. could be the contacts have gotten dirty.
i have ran across that before.

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Janitor Tzap
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Re: Hitachi VT-2200A VCR video drum dead

Post by Janitor Tzap » Sun Apr 14, 2013 12:06 pm

I don't think it is that simple Externet. :P

The head is turning freely, so it's not a bearing problem.

Ken1,
With just the top of the case removed.
Try plugging, and unplugging the VCR.
You should see the head spin for a second or two.
If not, check the connections too the lower drum motor first.
If they are okay, it could be the lower drum motor or the drive IC.

If it does spin for a second.
Start checking the belts for slipping, and the Mode Switch and Gear Alignment.
Note: Mode Switches can get dirty, causing this kind of problem.
In most cases this will require removing gears to access the Mode Switch too clean it.
Thus, once the Mode Switch is Clean, or if you need to replace it.
You'll need to known how to do the Gear Alignment procedure and Mode Switch Alignment.

The website Studio Sound Electronics is supplying belt kits for your VCR.
http://www.studiosoundelectronics.com/m ... T.htm#chtp

{For some reason the Chassis Pictures aren't coming up in my browser}. :sad:

But send them an E-mail asking for the Gear Alignment procedure and Mode Switch Alignment.

Hopefully it just needs belts and cleaning an Alignment.


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Ken1
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Re: Hitachi VT-2200A VCR video drum dead

Post by Ken1 » Sun Apr 14, 2013 4:27 pm

Hi, Plugging and unplugging produces no movement.

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Re: Hitachi VT-2200A VCR video drum dead

Post by Externet » Sun Apr 14, 2013 5:15 pm

Janitor Tzap wrote:I don't think it is that simple Externet. :P
The head is turning freely, so it's not a bearing problem...
¿ ? - I did not mention bearings...
- Abolish the deciBel ! -

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Re: Hitachi VT-2200A VCR video drum dead

Post by Janitor Tzap » Mon Apr 15, 2013 10:14 am

Ken1 wrote:Hi, Plugging and unplugging produces no movement.
:sad: Not good.
Externet wrote:
Janitor Tzap wrote:I don't think it is that simple Externet. :P
The head is turning freely, so it's not a bearing problem...
¿ ? - I did not mention bearings...
Sorry, typing out loud, there. :razz:

Hmmm...........

It maybe the Mode Switch.
But Ken1 is saying the Drum Motor won't even jitter when just plugging and unplugging the AC Power.

Now that I ponder this more.....
It could be a Power Supply Regulator IC.
Many of the RCA/Hitachi/ and other brands that used the same design,
had issues where the Regulator IC would fail due too a power surge.

Find the power supply section, and look for an IC that has multiple pins coming out of it, and is mounted vertically on a large heatsink.

Take the number off it, and look up what the NTE Cross is.
Or see if you can find the Data Sheet with the Pin information.
Then use that to check the voltages coming out of it.

If the voltages are okay, then you might as well start looking for another VCR that is working.
Because that would indicate a bad Lower Drum Motor Drive IC, or burned out Lower Drum Motor.

If your bound and determined to fix this.
Heres the Sams PhotoFacts Service Manual that you can order.
https://www.samswebsite.com/en/photofac ... x/id/70662

Plus.....
VCR parts have become hard to come by, and not just the mechanical parts.
So you may need to go to Pawn Shops, Swap Meets, or Garage Sales to find used units that you can part out, to fix your unit.

Good luck too you!


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Re: Hitachi VT-2200A VCR video drum dead

Post by Ken1 » Mon Apr 15, 2013 11:22 am

Hi, Regulator is a STK5372. Crosses to a NTE 1883. Voltages I measured are as follows:
Pin 1 0.7V
Pin 2 1.3V
Pin 3 9.3V
Pin 4 9.0V
Pin 5 12.0V
Pin 6 13.2V
Pin 7 22.5V
Pin 8 0V

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Janitor Tzap
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Re: Hitachi VT-2200A VCR video drum dead

Post by Janitor Tzap » Mon Apr 15, 2013 1:36 pm

Ken1 wrote:Hi, Regulator is a STK5372. Crosses to a NTE 1883. Voltages I measured are as follows:
Pin 1 0.7V
Pin 2 1.3V
Pin 3 9.3V
Pin 4 9.0V
Pin 5 12.0V
Pin 6 13.2V
Pin 7 22.5V
Pin 8 0V
I looked it up as well.
Here's the info I found.
Pin 1 V03/5.3V
Pin 2 Cutoff
Pin 3 Vin 2
Pin 4 V02/12.0V
Pin 5 V01/12.1V
Pin 6 Vb
Pin 7 Vin 1
Pin 8 GND
From this I can postulate that.
Pins 3-7 are Voltage inputs.
Pins 1-4-5 are Voltage outputs.
And it looks like the 5.3V is missing on pin 1, and the 12V on pin 4 is low.

You should check the rest of the power supply circuit.
Check for blown Capacitors, Diodes,Transistors, and or burn Resistors.
{Note: some resistors will not show that they have opened up.}
Before you replace just the Voltage Regulator.


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Re: Hitachi VT-2200A VCR video drum dead

Post by Ken1 » Tue Apr 16, 2013 6:42 am

Hi, I found 1 bad electrolytic, a 220uf 16v unit. I also noticed what may be the main reason why the regulator failed, the heat sink mounting screws were so loose I could have removed them without a screwdriver. I had a used regulator on hand that I salvaged years ago from another vcr so I installed it and the drum turned a bit when I plugged it in. I inserted a tape and everything works perfectly and the outputs are all correct now. The vcr played the entire 3 hour tape flawlessly so I consider it fixed. Thanks everyone for the advice!

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Re: Hitachi VT-2200A VCR video drum dead

Post by Janitor Tzap » Tue Apr 16, 2013 1:02 pm

Ken1 wrote:Hi, I found 1 bad electrolytic, a 220uf 16v unit. I also noticed what may be the main reason why the regulator failed, the heat sink mounting screws were so loose I could have removed them without a screwdriver. I had a used regulator on hand that I salvaged years ago from another vcr so I installed it and the drum turned a bit when I plugged it in. I inserted a tape and everything works perfectly and the outputs are all correct now. The vcr played the entire 3 hour tape flawlessly so I consider it fixed. Thanks everyone for the advice!
Good work Ken1! :grin:

Wish I could say the same for me at the moment.
Got a Sharp DV-RW550U Combo Unit on the bench currently.
I really want to slap around the guys who designed the Main Board!!!
They put Electrical Connectors on the DVD Player/Burner,
so you can easily remove it to work on or just replace it.
But they didn't use Electrical Connectors for the VCR Chassis!!! :x
The wiring from the Erase Head, Video Heads, Lower Drum Motor, Audio Heads, Dew Sensor,
Capstan Motor, and Eject/Load Motor are all soldered down to the Main Board!!!! :x
I've taken some old 20 Pin IC Sockets and made a few connectors out of them.
So, I won't need too unsolder all the wiring each time I need to work on the VCR Chassis.
But one the wiring ribbons is that real thin stuff. :x
And I'm trying too find out what the spacing is, and maybe find an edge connector I can use, but I'm finding it tough. :(


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Re: Hitachi VT-2200A VCR video drum dead

Post by Janitor Tzap » Sat Apr 27, 2013 6:36 am

Update: Sharp DV-RW550U Combo Unit.
Janitor Tzap wrote:Wish I could say the same for me at the moment.
Got a Sharp DV-RW550U Combo Unit on the bench currently.
I really want to slap around the guys who designed the Main Board!!!
They put Electrical Connectors on the DVD Player/Burner,
so you can easily remove it to work on or just replace it.
But they didn't use Electrical Connectors for the VCR Chassis!!! :x
The wiring from the Erase Head, Video Heads, Lower Drum Motor, Audio Heads, Dew Sensor,
Capstan Motor, and Eject/Load Motor are all soldered down to the Main Board!!!! :x
I've taken some old 20 Pin IC Sockets and made a few connectors out of them.
So, I won't need too unsolder all the wiring each time I need to work on the VCR Chassis.
But one the wiring ribbons is that real thin stuff. :x
And I'm trying too find out what the spacing is, and maybe find an edge connector I can use, but I'm finding it tough. :(


Signed: Janitor Tzap
After much searching.....
I was able to find edge sockets and ribbon cable from DigiKey that would work. :D

Now that I had that problem solved.
I focused on the real problem, of it not always going into the right mode,
or just ejecting the tape out immediately after putting it in.

Belts were fine, and gear alignment wasn't off either.
This left only the Load Function Switch, which is soldered down to the Main Board.
I desoldered it from the Main Board, and carefully pulled it apart.
Yup, it was the culprit.
The insides of the wipers, and metal contacts were coated with oxidation.
I then got some metal polish, and some Q-tips and polished them, till all the oxidation was removed.
Then used Ethyl Alcohol to remove the metal polish residue.
I then put a drop of Contact Cleaner/Protectant on the wipers & metal contacts.
For good measure, I put a drop of "Tuner-Lube" on them as well.
Then reassembled it.

After resoldering the Load Function Switch back down to the Main Board.
Reconnected the VCR Chassis back up, and gave it a test.
It ran perfectly, going through all its modes. :grin:
{Wipes sweat away from brow.}
I was a bit scared there...
Because I had no idea where I was going to get another Load Function Switch, if just cleaning the old one didn't work. :mrgreen:


Signed: Janitor Tzap

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Re: Hitachi VT-2200A VCR video drum dead

Post by dacflyer » Sat Apr 27, 2013 10:00 am

i usually run into the same problem with them mode switches. mark its position very carefully 1st.
i'd take the switch apart as well, clean it up good. only thing i did a little different was carefully give the wiper a slight bend, to increase its contact pressure. just a little.
99% of the time that fixed the problems it had..

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Janitor Tzap
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Re: Hitachi VT-2200A VCR video drum dead

Post by Janitor Tzap » Sat Apr 27, 2013 1:10 pm

dacflyer wrote:i usually run into the same problem with them mode switches. mark its position very carefully 1st.
i'd take the switch apart as well, clean it up good. only thing i did a little different was carefully give the wiper a slight bend, to increase its contact pressure. just a little.
99% of the time that fixed the problems it had..
Yeah,
I had a Quasar VCR that had the Mode Switch problem.
But even after cleaning the Mode Switch, it still would not operate correctly.
I called up a friend who had a shop and asked him why it wouldn't work.
He had me take the Mode Switch apart, and using 10X magnifier look at the metal contacts,
and see if there were grooves on them from the wipers.
There were.
This explained why it didn't function correctly.
The metal had been worn straight through, and the wipers were no longer making good contact.
Thus, I had to find a replacement Mode Switch to fix it.


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Re: Hitachi VT-2200A VCR video drum dead

Post by dacflyer » Sat Apr 27, 2013 6:42 pm

wow.. that really was worn out.. i always put a dab of lubriplate or some sort of lithium or Teflon based lube on them..

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