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 Post subject: Unusual Power Cord Question (AC/DC) - Hitachi CT0911
PostPosted: Sep Sat 28, 2019 7:15 am 
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Joined: Sep Thu 20, 2018 8:53 pm
Posts: 111
I was gifted a 1982 Solid State Hitachi CT0911 mini television set recently. It originally included both a 12V DC cigarette lighter adapter and a 120V AC adapter. However mine only came with a cut off TV-end of the 12V DC. Unlike an ordinary plug, this one uses a 6 Pin socket type that I have never seen before.

  • The top two holes appear empty with no conductive material.
  • The middle two holes have brass-colored metal.
  • The bottom two holes have silver-colored metal.
  • The cord is branded "Hirakawa WM VM0023A DC 12V."
  • It has two wires, one with a white stripe and one with text ("E35496 Type SPT-2 2X18AWG VW-1.0 HIRAKAWA").
  • The TV power adapter input has six silver pins and no markings, but the adapter is slotted to only fit one way.

I am trying to figure out what it would take to create my own AC power cord from this or locate a compatible type. Below are photos.

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 Post subject: Re: Unusual Power Cord Question (AC/DC) - Hitachi CT0911
PostPosted: Sep Sat 28, 2019 8:53 am 
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Joined: Feb Wed 07, 2018 6:52 pm
Posts: 766
Location: Stone Mountain, GA
Probably, the two top pins are the AC inputs. Looks like a 2-pin plug might work with the right spacing.

You will have to trace the connections and.or locate a schematic.

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 Post subject: Re: Unusual Power Cord Question (AC/DC) - Hitachi CT0911
PostPosted: Sep Sat 28, 2019 10:32 am 
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Joined: Sep Thu 20, 2018 8:53 pm
Posts: 111
You were right! I was able to use an old TV power cord (from my Admiral, actually) and everything works perfectly on it. Only thing I can't find on the TV is any way to adjust width/height including any of the internal adjustments. Only vertical hold.


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 Post subject: Re: Unusual Power Cord Question (AC/DC) - Hitachi CT0911
PostPosted: Sep Sat 28, 2019 2:14 pm 
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Joined: Apr Sat 06, 2013 2:18 pm
Posts: 544
Location: New Hampshire
Usually 2 pins are AC & 2 are a jumper. If both the hoz & vert are small
it could be it needs the jumper but be sure before trying it. Sams lists
the manual but its an OEM photocopy for $25. They can be almost
unreadable.

73 Zeno 8)
LFOD !


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 Post subject: Re: Unusual Power Cord Question (AC/DC) - Hitachi CT0911
PostPosted: Sep Sat 28, 2019 6:50 pm 
Member

Joined: Nov Tue 25, 2008 12:47 am
Posts: 421
Location: Lehigh Acres, FL, USA
Not really that unusual of a plug. Alot of early AC/DC sets used this connector that I've seen.


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 Post subject: Re: Unusual Power Cord Question (AC/DC) - Hitachi CT0911
PostPosted: Sep Sat 28, 2019 7:09 pm 
Member

Joined: Sep Tue 30, 2014 6:08 am
Posts: 5673
Location: Norfolk, VA
January 1981 CT0911 manual. it's a multi-page TIFF, the only way Hitachi supplies it. I added it to my Google Drive.

https://drive.google.com/open?id=1WC1n5 ... DandrEXEW2
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FYI, I have 11,000 Original TV service manuals - free if I'm able to upload them, else a microfiche, and that will require mailing/money. I also have many, many Sams.....

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Brian
"Capacitor Cosmetologist since 1979"
USN Retired 1984-2006 (Avionics/Cal)


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 Post subject: Re: Unusual Power Cord Question (AC/DC) - Hitachi CT0911
PostPosted: Sep Sat 28, 2019 8:21 pm 
Member

Joined: Sep Tue 30, 2014 6:08 am
Posts: 5673
Location: Norfolk, VA
zeno wrote:
Usually 2 pins are AC & 2 are a jumper. If both the hoz & vert are small
it could be it needs the jumper but be sure before trying it. Sams lists
the manual but its an OEM photocopy for $25. They can be almost
unreadable.

73 Zeno 8)
LFOD !


No jumper for AC operation...


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.

_________________
Brian
"Capacitor Cosmetologist since 1979"
USN Retired 1984-2006 (Avionics/Cal)


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 Post subject: Re: Unusual Power Cord Question (AC/DC) - Hitachi CT0911
PostPosted: Sep Sun 29, 2019 2:18 am 
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Joined: Sep Thu 20, 2018 8:53 pm
Posts: 111
Thank you so much, FK. I have the original owner's manual for it but not the service manual so this is very handy especially to see where all of the adjustment points are! The prior owner said it belonged in a dump or burn pile, as it had just sat in their garage forever. But I cleaned it up great inside and out and it is working like new currently. When I have a bit more time I will fine adjust it. Did you ever get a master list made of all the manuals you have for reference? I'm sure I will have other requests in the future!

For the power cord, I had a new common figure 8 style on hand that is used in many modern appliances. I cut around the plastic molding since it didn't quite fit the area, and the inner-prongs were able to be formed tightly around the chassis prongs. So I now have a secure power cord in place and have tested it for an hour without any problem.


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 Post subject: Re: Unusual Power Cord Question (AC/DC) - Hitachi CT0911
PostPosted: Sep Sun 29, 2019 10:28 pm 
Member

Joined: Jan Thu 01, 1970 1:00 am
Posts: 787
Location: dayton oh usa
you might find some dried out caps in the power supply.
this causes poor regulation.
its the tiny ones.
but now they may all be done.
i repaired the base model of your set for a friend for his retro game console collection.
it produced a great image once i got the b+ stable.
fun fact.
the one i fixed had a tiny necked delta gun crt.
not sure if your deluxe model got an inline along with varactor tuning.


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