[TenTec] Corsair II weak weak receive

[Gary - AB9M]

Slide the AUX ANT / AUX RX switch back and forth about 20 times...... often 
corrosion / oxidation causes weak receive; cleaning the switch will put 
things back to normal.

73 & DX,

Gary - AB9M

-----Original Message----- 
From: jon greenwood via TenTec
Sent: Monday, October 05, 2015 9:40 PM
To: tentec at contesting.com
Cc: jon greenwood
Subject: [TenTec] Corsair II weak weak receive

Hope some of the good troubleshooters on here can point me in a direction. I 
have a Corsair 2 that is very weak on receive. I have checked transistor 
voltages on IF/AF board 80984, the Osc/mixer board 80975, and the RX mixer 
board 80987. All seem good or very close to specs in manual, except Q6 on RX 
mixer 80987.
I am reading 11.5 volts on base emitter and collector in receive mode. In 
Transmit these all read correctly base emitter and collector zero volts. I 
replaced the 270pf cap C24 as well as C25 5-25pf variable cap. No change. I 
removed the Q6 transistor and the radio receives exactly the same. I 
replaced with a new transistor with no change. So my thought is a bad  a 
component around Q6 but at this point I am stumped on what it is. I also 
checked D7 and D8 pulling them off the board and just checking with my ohm 
meter. Flow in only one direction on each so they seem good.
Any thoughts/ test procedures would be much appreciated. I have a 100mhz 
digital scope and an older Fluke DMM that I have to work with. 
Questions/Thoughts? Jon N8MUS
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