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Re: DR7 help


 

Okay, I have been working on the DR7 board and I found that the following I.C's do not have any Plus 5 volts DC on them. They are U9001, U0002, U9003, U9004, U9005, U9006, U9007, and U9008. I do have the service manual but the schematic does not show me where the 5 VDC is coming?from and what it is going through. I do have 5 VDC coming out of the 2 7805 regulators okay. All of the other I.C's have the 5VDC on them okay. I will remove the DR7 board?for a third?time today and try to follow the line back from resistors?R9003 R9004 R9005 and R9006 as they do not have any 5VDC either. Thanks guys for the help. Any further suggestions are always welcome.

73, Jim VE1RB

On Sat, Dec 21, 2024 at 11:56?AM Jim WA9Z via <jim=[email protected]> wrote:

[Edited Message Follows]

"withe the NORM/EXT set in EXT, the display should be on, and showing 00000"?
mike wb8vge
?
Actually, EXT mode with no sample port input, DR-7 should blank with only the 100hz dot illuminated.
All zeroes display would only occur when EXT input signal is exactly 100MHz.??
Jim WA9Z?
?

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