Welcome home

This is my QUASAR:

Unfortunately the glass is broken in 3 parts, but probably I found a new one.

Coin door has been hacked but nothing particular.


Cabinet seems to be complete but dirty. It passed the last 3 years in a barn…

Inside

Opening the cabinet I could see that it was compete (it’s a good start!!) but with some problems…

Wood neon was there but not working

small neon assembly was complete but dirty

tons of dust were all around the speaker, but nothing serious

Inside I could see the primary section of the transformer was burned….

Monitor is a Philips KT-3, with its instruction flyer on the right

Here you can verify that nothing is missing

Yep, veeeery dirty!

Disassembling

Disassembling the cabinet I found a lot of rust. All parts were very dirty but nothing was broken (excluding the monitor).  

this is the KT-3 TV. Dirty and broken.

the typical power supply

This is the burned transformer. 

Rust rust rust rust…

Glass

Silkscreened glass is broken. I tried to repair it but… how can I say… ah..

220v wiring

I remade part of the 220V wiring. Parts have been cleaned and derusted I usually change the general switch from a SPST to a DPST. More often with a DPDT that are more common.  

SPST: Single Pole, Single Throw
DPST: Double Pole, Single Throw
DPDT: Double Pole, Double Throw

 You can see on the left the old switch and on the right the new one

These are the metal parts after cleaning and after the de-rust liquid

this is the result with new cables and connectors

Fan

Fan was broken… Ok I can use the fan of my “next” restoration (in queue…), so look at Vanguard resto to see how I restored this part 😀

Power Brick

Looking at the first pictures (i.e. the image I re listed again here) you can see that half of the transformed is burned. More in detail the primary coil is damaged and every time I plug the game the fuse burns. First of all removed the power brick from the cabinet and I tried to clean all parts in order to understand if I could find other damages.


It was clear to me that the primary coil of the transformer had gone…

Before removing the transformer I took some pictures of the wires positions

Then I removed the transformer but I couldn’t disassemble the leafs immediately so I decided to cut loop by loop

In the end I removed the leafs releasing the coils.

I had an old Zaccaria’s transformer with one not working secondary coil (the one with 11Vac used to produce the +5V) and I disassembled it too. Then I “cut” both transformers dividing the primary from the secondary and I saved the secondary coils package of the original transformer and the primary coils package from the second transformer.

The result is not bad 🙂

Last step: I reprinted the sticker used to indicate the fuses.

Coin Door

Usual job for the coin door. This tme I ould save the stickers so I’m quite happy 😀

These were the starting conditions

I just cleaned the surfaces removing all components

Then I restored the plastic component

I used an epoxy part to close the hole made by the rivet

Then I painted with a spray chrome effect

Reject button was rusted (I want to say: as usual…)

but nothing that couldn’t be removed…

The same for the other metal parts

Not so good pics here but the result is not bad

Control Panel

Control Panel was quite burned. Too much cigarettes in that place!! In some parts CPO was curved by the high cigarettes temperature  

First of all I sanded the CPO to remove brown burns and scratches

then I used fine sand paper, Pasta Abrasiva (used for cars) and then Novus 3, 2 and 1

This is the sequence of the result

Then I reprinted the flyer that I damaged removing if from the CPO

Now this is  the CPO 

KT-3

In the beginning I though monitor was not in so bad conditions, but after a second look I could see that all connector had been plugged casually (most of connectors are similar)

Then I found some damages

• a wire all around the fuse !!#@#?!
• Wrong R291 (R33 instead of 4R7)
• R562 missing with a burn on the board
• R466 burned
• TS463 missing

these are the chassis defective parts positions

Broken / missing / burned components are:

 
I changed all these parts and switching on TS463 exploded :O I need more troubleshooting I think 😀   anyway I cleaned all boards:

KT-3 Troubleshooting 2

I checked some values on the board and I definitely have to understand what’s happening there 😀

 
This is the complete oscillogram:

Glass

The original glass is broken

a friend of mine had one but with “some problems”. Here is the glass:  

Looking at the back the situation is not better

So I found acrylic colors very similar to the originals


And I painted the missing parts color by color

 

This is the result.  

 

Not perfect but good enough 🙂

KT-3 Troubleshooting 3

I changed some transistors and TDA, replaced some capacitors and checked some resistors values. Now I want to troubleshoot the switching regulator board


    In order to avoid any burn I removed the T465 connecting pins 6 and 8 only in order to close the circuit.


The troubleshooting manual describes the waveforms on this circuit in several parts. This is the most important part of the circuit:


  with related waveforms:


I checked points “B”, “D”, “E” and “F” this is the waveform in B. I think it is ok

B

Checking the point “D” I had the same result as in the previous troubleshooting post, with regular spots blinking. Regulating R7317 (the pot. on the daughterboard) I could stop the blinking effect having a static image as the following

D

 
It is an extreme case of the waveform where the lower part of the square is reduced to a point. Transistor T7353 works properly because point “E” has the same shape but inverted    

E

In the end the waveform in “F” is the following. It is static and doesn’t pulse anymore

F

Looking at the pictures t2 seems to be close to zero….

Final pictures – inside

This is the cab inside. TV is not working but I received some spares so in the next days I’ll try to repair it… again…

Final pictures – Side art and CP

New KT-3 and Current status

I replaced my KT-3 with a new chassis send by an ArcadeItalia forum. without any calibration I had this picture:

These are other screenshots after some calibrations

 
CURRENT STATUS: plugging the sound board +5V decrease to 1,4V. So no sound at the moment. The rest is almost complete.

Sound problems

Sound board and main board have the same connector. I could see that the cable connector to the sound board had a label with a number corresponding to the connector on the main board. So the cable was up side down. Now the sound is perfect!

Old KT-3 Vs. New KT-3

Actually I made an easy job swapping the old KT-3 chassis with the new one. I only changed the color input board and removed the tuning card.   This is the input color board I’m using (taken from the old TV)


  I can see that the new power card is more populated than the old one. I used the new one including the Degauss circuit. The old chassis had a small dedicated circuit screwed on the left of the metal frame for that.


On the left you can see the old power card and on the right the new one.