K1 Problem

[Glenn Haffly]

K1 has a problem at J8 pin 7. Specs should be 1.6K to 1.9K.

So far have found that J8 pin 7 to ground is zero. Tried reversing test
leads and the same.
P3 is jumpered pins 1 and 2. D15 anode to ground 195 ohms. D15 cathode to
ground
98.6 K. R36 in circuit 1.96 K . R37 in circuit 1.96 K. R34 in circuit 77.3 K
.
R4 in circuit 5.4K . Pin 19 of P1 is 104.2K
All of these are with a 4 band filter removed.
This probably explained why I am unable to get a input signal from an RF
generator to
align filter board.

All other voltage and resistance checks are in specs.

Any advice of what to check next would be appreciated.

Glenn

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[Mike Morrow-3]

Glenn wrote:


>K1 has a problem at J8 pin 7. Specs should be 1.6K to 1.9K.
>
>So far have found that J8 pin 7 to ground is zero....

Glenn,

About the **only** thing that can be causing everything you describe is a
simple unwanted solder bridge to ground (most likely from J8 pin 7 to pin 6)
on the circuit between J8 pin 7, J5, and P3.  Visually check closely for
such a bridge at J8, J5 (antenna), and P3 and the traces between them.  It
should be simple to fix when you find it.

73,
Mike / KK5F


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