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Ampex ATR700: Help needed

S

SFM-Ptgal

Does anyone have an ATR700 manual and serviced that machine?
I have an ATR700 with 2 issues: the STOP doesn't work at all, the FRew neither. I have a manual.
What I ask is: can you help me by consulting your manuals and give me hints to fix the problems? Something like "check schematics XX-XXX and replace this and that"...

Thanks a lot!

Pedro
 
I got a manual. Looks like you need to refer to schematic 1418946 pg 6-9/10 and Fig. 4-3 on pg 4-6 and 4-7. The key switch (buttons) signals go into the control unit board on connector CN171 and come out on CN41. Fig. 4-3 shows what signals you should see on the ICs in all the modes of operation (see section 4). Good luck.
 
Hi Pedro, In the 18 years I used/abused those machines I found most of the transport control issues were bad switches. I used to have a ton in stock. The other times it was a logic chip on the power supply board.
Good luck from me as well,
Blake
 
BlakeZip said:
Hi Pedro, In the 18 years I used/abused those machines I found most of the transport control issues were bad switches. I used to have a ton in stock. The other times it was a logic chip on the power supply board.
Good luck from me as well,
Blake
Click to expand...

A long time ago i checked the remote connector to see if the problem remained. It did, so I'm lead to presume that ain't a bad switches
issue. The power supply board hasn't ICs (chips) ::)
Pedro
 
ncradioeng said:
I got a manual. Looks like you need to refer to schematic 1418946 pg 6-9/10 and Fig. 4-3 on pg 4-6 and 4-7. The key switch (buttons) signals go into the control unit board on connector CN171 and come out on CN41. Fig. 4-3 shows what signals you should see on the ICs in all the modes of operation (see section 4). Good luck.
Click to expand...

Since I'm not tech. skilled how do I check that? Multimeter, one tip at the pin, the other on ground? ::)
 
Yes. A logic high should read close to 5V and a logic low should be close to 0V. There are some 100uF/10V caps and a 10uF/16V cap in there that may be dried out. I would replace those first (you can use a higher voltage cap). C48 and 49 at IC3 are bi-polar (non-polarized) type.
 
It sounds like you're on the right track. I was going from memory on the chip location, they are on the control board that attaches to the back of the switch board and then feeds the signals to the power supply board. ncradioeng has it right... check the signals on CN171 going into the control board, when a sw. is pressed it should go to ground on the connector or the logic chip input it feeds. On the CN141 output section most of the signals should go to +5 v when 'on'. If all of that checks OK then it could be the actual relays on the supply board too. Hope you find it, Blake
 
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