Hello again,
I've continued my troubleshooting efforts but the problem persists.
I had reflowed all connections except those of X3, so I removed L33
and R116 to do so. Everything appears to be well connected and I
don't see any shorts.
I checked the DC voltages on U11 using the internal probe and have
the following values:
Pin 1: 1.4
Pin 2: 1.4
Pin 3: 0.0
Pin 4: 4.8
Pin 5: 4.8
Pin 6: 5.6
Pin 7: 5.0
Pin 8: 6.0
I used the RF probe to check the voltages with the following results:
U11, pin 6: 0.74
TP2: 0.024
The DC voltages for U11 pins 6 and 7 are a bit low and the RF probe
values are on the edges. Is it possible that U11 is bad?
73,
Craig
On 18 Feb, 2007, at 10:46, Craig Young wrote:
Hello to the group.
I am currently working through the Alignment and Test, Part II and
have run into the following issue. When I perform the BFO Test, I
don't get the proper range. The set of values I get are:
BFO High Freq.: 4917.31 kHz
BFO Low Freq.: 4916.97 kHz
Range: 0.34 kHz
The documentation states that if the BFO range is less than 3.6
kHz, the varactor diodes (D37 and D38) or the crystals (X3 and X4)
may be incorrect. However, I've verified them and they are
correct. I've also gone around looking for bad soldering (cold
joints or bridges) and didn't see anything obvious. I've checked
the resistors and capacitors in the BFO section and they appear to
be correct.
Does anyone have any ideas of where I should look next?
73,
Craig AC6NN
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