[R-390] Still deaf below 8 Mc

[Jon Schlegel]

Looks like the R-390 (non A) doesn't have a tuned plate load like the 
"A" does so there's no equivalent cap in R-390

Jon

At 04:43 PM 10/27/2007 -0600, you wrote:
>I think he said R-390 not A. Chucks fix is for R-390a. Not sure if it applies.
>
>Tony
>
>----- Original Message ----- From: "Walter Wilson" <wewilsonjr at gmail.com>
>To: <r-390 at mailman.qth.net>
>Sent: Saturday, October 27, 2007 3:55 PM
>Subject: Re: [R-390] Still deaf below 8 Mc
>
>
>>I always replace C327, especially if signals below 8MC are a problem:
>>See http://r-390a.us/R-390A%20Restoration%20Checklist%20v2.htm for a
>>more detailed checklist.
>>
>>Chuck Rippel's site also has this listed as a common problem:
>>http://r390a.com/Commonfail.htm#I%20was%20finishing
>>
>>Walter - KK4DF
>>
>>
>>
>>On 10/27/07, Jim Green <jagreen3 at sbcglobal.net> wrote:
>>>  I'm still plugging away with my R-390/URR (Not R-309A/URR). The main
>>>struggle is the deafness below 8 Mc. I am following the Third Echelon
>>>troubleshooting procedure in TM11-5821-357-35. I've made it to Signal
>>>Substitution Part e IF sub-chassis tests Step 2 where the procedure
>>>is to apply a modulated 2Mc signal to E-210 with the receiver in
>>>standby mode. I am supposed to hear a signal in the headphones. I
>>>hear nothing. If nothing is heard the procedure is to:
>>>
>>>1) check V205 (checks good),
>>>2) check V701 (checks good)
>>>3) check the V701 circuit components by voltage and resistance
>>>measurements. All voltages seem within range except Pin 1 at -0.46
>>>VDC (should be -1 VDC to - 2.3 VDC). All resistances are OK except Pin
>>>1 at 178K (should be 150K) and Pin 5 at 19.8K (should be 8.5K,
>>>however the voltage at pin 5 is right on the money at 178 VDC).
>>>
>>>Does anyone see any major issues with these readings? Note I'm using
>>>a Fluke model 77 to take the measurements.
>>>
>>>4) Check the vfo operation by measuring the DC voltage at E210
>>>(measured 0.000 VDC). The manual goes on to say: The voltage should
>>>be between -3VDC and -11VDC. If the voltage outside these limits
>>>check J223 and P723. J223 looks OK, but the cable P723 is connected
>>>to has a kludjy splice in it. When I measure the voltage from the
>>>center pin of P723 to ground I get 0.000 VDC. Perhaps this is OK
>>>since it's likely an AC signal (I measured  0.01VAC). When I measure
>>>resistance I get a dead short to ground. Are these measurements normal?
>>>
>>>Jim (KG9MM)
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