Ok it's time to get serious with this g07-pos

scaboo4u

Well-known member

Donor 2011, 2013
Joined
Jan 19, 2010
Messages
1,838
Reaction score
38
Location
Myrtle Beach, South Carolina
I brought the monitor home tonite so if some one want to steer me in the right direction on this that would make me very happy.
To refresh things. I put together a 60-1 in a taito cab with a g07-cbo.
everything was fine for about 2 weeks until we loaded it up and moved it about 7 miles.
We put in the house and waited about 45 minutes and powered it up.
No pops,no smoke ,no flashes everything works but monitor. At which time I swapped out the chassis and same. To get back to the first chassis so far I,m getting 120v at the connection on the board.
I went back today and checked the B+ and getting .004 testing the other side same thing.
I tested both fuses using ohm/continuity both show fine.
It would seem both chassis have the same problem so fixing 1 I may get lucky and find out what wrong with both.

thanks in advance
Allen
 
Ok If I'm looking at this right 902 is in the pic. Following the flow chart I don't see anything about getting a 0 reading at both ends of R 1
 

Attachments

  • new post.JPG
    new post.JPG
    42.8 KB · Views: 19
R1 or R2 right below it may have gone open, test them both. If they both test good, test R908. If R908 tests good, look for hairline cracks.
 
R1 or R2 right below it may have gone open, test them both. If they both test good, test R908. If R908 tests good, look for hairline cracks.

Is R908 right beside R422 actually to the left of.

I,m gonna go get a better dmm this thing is a piece of crap.
 
Last edited:
You'd also get 0 volts if F901 was bad, or if the pins in your power connector were hogged out and not making a good connection, or if there was no 120 coming into the monitor...
 
You'd also get 0 volts if F901 was bad, or if the pins in your power connector were hogged out and not making a good connection, or if there was no 120 coming into the monitor...

I,m getting 120 at the board where the 2 wires are soldered on. Just left of v.hold
Would I need to remove f901 to test it.

Also seemed weird that when I tried to discharge monitor I didn't get a spark or pop nothing.

May sound crazy but can,t you discharge the chassis disconnected from the tube or no.
 
Would I need to remove f901 to test it.

Nope. Just shut it off and test it for continuity.

Also seemed weird that when I tried to discharge monitor I didn't get a spark or pop nothing.

You'll get no spark if the HV section isn't coming up.

May sound crazy but can,t you discharge the chassis disconnected from the tube or no.

The chassis doesn't hold a charge (unless F902 is blown, then you need to discharge the filter cap before it shocks the shit out of you), so there is nothing to discharge. You can discharge the TUBE without the chassis installed, though, and you should before you ever go near the anode hole...
 
I,m thinking there is gonna be something stupid and small .
I will go through the stuff you and Dave mentioned in the morning.

Thanks again for your help

allen
 
R1 or R2 right below it may have gone open, test them both. If they both test good, test R908. If R908 tests good, look for hairline cracks.

Ok now I,m gonna be a dumb-ass is R1-R901 and R2-902

I checked R902 and get nothing and R901 is good

I finally feel like I,m getting somewhere.
 
Last edited:
Ok I talked to a local tech that didn't want to GIVE up to much info,But did throw out an idea.
Said it is possible since I have 2 g07 chassis out of the same cab with the same problem (bad resistor R902)
that I might have a bad ground at the source or at the iso transformer.

What do you guys think.

I don't only want to know what went bad, But also why it went bad.

thanks allen
 
It is possible, but I highly doubt it.

Very hard to give you a what and a why when I can't see and or touch all of the pieces myself.
 
This is the last question, That is until I get new parts.

The ac plug is cut at the chassis. Does it matter which side is which going to the iso transformer.

allen:)
 
I don't like asking a bunch of lame questions. Just trying to figure out what happened to 3 monitors in 1 cab.

I went back and looked at the wg4903 which was the last monitor swapped out and found some fried stuff and the 60-1 got cooked all 4 leds stay solid and there is a high pitch squeal and after about 5 sec one part of the pcb feels like it is gonna catch fire. It just seems like something is going on with the iso transformer.I don't know that is why I was asking about the ground either at the wall socket or the transformer.
allen
 
There is a very good chance you don't have the iso trans in correctly. If you are frying things something is very wrong. I haven't worked with any Taito cabs in a long time but recall that their wiring is not the most intuitive. You might want to take some photos of your wiring so that we can check it out.
 
Back
Top Bottom