IR3300 Laser Unit

[BillyCarpenter]

yes that machine has a wire harness and vacuum seals the board to the 'jig'.. then they press a button to start the diag process. My first ex-wife worked on the testing line at Memorex Telex and she alone could run test on 10 boards a day from the manufacturing line. If they pass it went on to assembly .. if it failed the machine would automatically print out a report pin-pointing the component(s) that failed.. then they would remove it and send it back thru the 'pick-n-place' machine, replace the defective part(s) and the process was started all over again.

Most times the surface mounted item had slipped out of it's spot before it hit the wave solder bath.

We manufactured Monitors... PC's,, modems .. dumb terminals and test equipment items for the service engineers in the field. I left MT in 1989 after working there for 13years in Stock room and Inventory Control where I was the manager of the Inventory Control team of 15 girls/guys.

It was a 65,000sq foot facility not including the three off-site warehouses.. Inventory time took 3 weeks from start to finish. depending on which section of the facility we could be in lockdown not allow out of the building. We had showers and a full restaurant that served 3 meals a day + snacks... 2,900 employees.

You have a vast knowledge, sir. Well done.

[Phil B.]

You have a vast knowledge, sir. Well done.

I'll be 64 in February... been working since I was 14..that was at McD's.. I also owned my own lawn mowing service at 12... by the time I left MD I had taken on a partner .. employed 12 guys to do the mowing ..Bob Austin and I repaired small gas engines .. we lent out our mowers for the guys to use and took a cut of the monies for us. I sold Bob the business for $2,400 in 1977 ( I was still working at McD's as Maintenance Mgr at the store with 2 others in my charge ...)

you do the math ;-)

[skynet]

I spoke with one of the guys at Hytek and he told me that they have some kind of diagnostic machine that they plug the board into and it identifies the problem in most cases.

Alternatively, supply power to the board and using a thermal camera identify which component heats up abnormally. A few YouTubers I watch make a living fixing phones using in some cases this method alone but they need specialist equipment. However, this board in question from a twenty-year-old machine could be hand soldered by someone competent.

Could be just dry joints.

[BillyCarpenter]

Alternatively, supply power to the board and using a thermal camera identify which component heats up abnormally. A few YouTubers I watch make a living fixing phones using in some cases this method alone but they need specialist equipment. However, this board in question from a twenty-year-old machine could be hand soldered by someone competent.

Yeah, I've seen the thermal camera used on YouTube. It's cool as hell.

[BillyCarpenter]

Back when I was in electronics school we would use a logic analyzer, logic probe and an o-scope with data capture feature to troubleshoot most PC boards.

I remember an old trick when all else has failed. I've tired it with varying results. But I was just playing around on some old TV's. I don't really recommend this. You can put the PC board in an oven for about 5 minutes and sometimes it will work if you have a cold solder joint and can't find it.

Anyone ever heard of this?

[Phil B.]

Back when I was in electronics school we would use a logic analyzer, logic probe and an o-scope with data capture feature to troubleshoot most PC boards.

I remember an old trick when all else has failed. I've tired it with varying results. But I was just playing around on some old TV's. I don't really recommend this. You can put the PC board in an oven for about 5 minutes and sometimes it will work if you have a cold solder joint and can't find it.

Anyone ever heard of this?

yup old trick for us senior tech in this field also..... about 300 for 5min.


some of joke with the newbies/end users " Put it in your micro-wave oven for a minute or so " yup we can be very cruel


re: Tube monitors .. NEVER trust ANYONE to drain the flyback.. I did one time... I took 14,000v in the right hand out the right leg ( my leg was touching the metal frame of the work bench.. knocked me back 6+' onto a brick wall.. burned a whole in my poly pants and took my breath away... I was still shaking @ 1800hrs.... The next day I questioned Jesse ( other tech ) did you drain the flyback? He barely got YES out of his mouth before I punched him out cold.

[BillyCarpenter]

yup old trick for us senior tech in this field also..... about 300 for 5min.


some of joke with the newbies/end users " Put it in your micro-wave oven for a minute or so " yup we can be very cruel


re: Tube monitors .. NEVER trust ANYONE to drain the flyback.. I did one time... I took 14,000v in the right hand out the right leg ( my leg was touching the metal frame of the work bench.. knocked me back 6+' onto a brick wall.. burned a whole in my poly pants and took my breath away... I was still shaking @ 1800hrs.... The next day I questioned Jesse ( other tech ) did you drain the flyback? He barely got YES out of his mouth before I punched him out cold.

Dude, I was in class working on a CRT TV and I used a flat head screw driver to pop off the wire going into the tube and that sucker zapped me something fierce. It caused me to snap my arm back and the screw driver went flying thru the air at a high rate of speed. Lucky no one was hurt. Never again. That's about 15k-17k volts if I remember correctly.

[Phil B.]

Dude, I was in class working on a CRT TV and I used a flat head screw driver to pop off the wire going into the tube and that sucker zapped me something fierce. It caused me to snap my arm back and the screw driver went flying thru the air at a high rate of speed. Lucky no one was hurt. Never again. That's about 15k-17k volts if I remember correctly.

yeah my leg was grounded to the table tho! OUCH!

[skynet]

You can put the PC board in an oven for about 5 minutes and sometimes it will work if you have a cold solder joint and can't find it.

Anyone ever heard of this?

Not too sure about the oven but way back I managed to get the logic board in these working again just by resoldering the power socket.

[BillyCarpenter]

Not too sure about the oven but way back I managed to get the logic board in these working again just by resoldering the power socket.

As a general rule of thumb, whatever component generates the most heat, that's where you look first. Anything that's attached to a heatsink is a good place to start.

Also, most components fail when the power is turned on because of power surging thru the circuit. That's why most light bulbs blow when you turn on the light switch.