[ct-user] do you have a TS-940 with IF-10B installed?

[Dennis Vernacchia]

Hi Eric,
	I had a problem when I installed my IF-10B in my 940 a couple
years 
ago, turned out to be 2 problems.

1. When I plugged in the Large IC (PROM?, there wasn't much support
under the board and when the board flexed it cracked !!!!]


2. A connector that was on the board which now connects to the 
IF-10B board had a connector installed 180 degrees backward
at the factory, This also implied that the factory never checked
 the computer interface circuitry........

Hopefully you don't have either of these problems but this is what
happened during my install......

If you can't get it to work, get yout IF-10B to someone who is willing to
swap
out your kit in their already functioning 940 with IF-10B

Good Luck

Dennis N6KI

On Wed, 13 Oct 1999 16:34:30 +0400 "Eric Scace" <scace@uu.net> writes:
>
>Hi everyone --
>
>   Do you have a TS-940 with the IF-10B board installed?  If so, could 
>you
>take a few simple measurements?
>
>   I'm debugging my TS-940 interface to the computer.  The radio has 
>the
>IF-10B board installed inside.  But the voltages present on the 6-pin 
>ACC
>connector at the back of the radio does not make sense, when compared 
>with
>the documentation.
>
>   Before I tear into the IF-10B itself (or replace it), I'd like to 
>compare
>my measurements with someone who has a properly-functioning 
>TS-940-computer
>interface.
>
>   Here is what I measure with a high-impedance voltmeter at the 6-pin 
>round
>DIN connector (no connection to any external level converters; i.e., 
>just
>voltages presented by the IF-10B to the outside world):
>
>pin 1:  documented as "signal ground".  measures +0.07v against 
>chassis
>ground.
>
>All other pins are measured against pin 1:
>
>pin 2:  documented as "RXD-bar".  appears to float, as it should if it 
>is a
>data input lead.
>
>pin 3:  documented as "TXD-bar".  measures +5.01v.  This seems wrong 
>to me.
>TXD should be held at a 'mark' condition until there is something to 
>send.
>So TXD-bar should be the inverse of that, or 0v??
>
>pin 4:  documented as "CTS".  measures at +5.01v.  That also seems 
>odd: CTS
>is a signal input, not output.
>
>pin 5:  documented as "RTS".  measures at +5.01v.
>
>pin 6:  documented inconsistently as VDD (TS-940 service manual) and 
>NC
>(IF-10 documentation in Japanese).  Mine measures at +0.02v, which 
>argues
>for "NC" (not connected).
>
>   Do you measure the same voltages?
>
>   Thanks!
>
>-- Eric K3NA
>
>
>--
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