Henry,
Some hams have reported solving that problem by simply reseating the circuit boards.
The DR-7 board is a bit tricky. Be careful not to bump the PBT preset pots on the front right.
If you can find some Caig DeOxit liquid or spray, wipe it on the male portion of the contacts, and insert/remove each card a few times to renew the surfaces. A little DeOxit goes a long way.
Before you put the cover back on, check the +10v line with a DVM. And check that the PBT presets are correct. You should be able to tune to these frequencies and hear a zero beat with PBT pushbutton out.
AM = 13695.0
RTTY = 13697.5
CW = 13694.2
LSB = 13696.4
USB = 13693.6
Tom AG9X
At 10:51 AM 11/21/2003, Henry Lewis wrote:
I have developed a fault in my TR7 relating to the UP/DOWN counters. If I leave the rig on say 3.750 and switch off, when I next switch on frequently it reads 2.750. Using the up/down buttons I can obtain only 2.250, 2.750 and 3.250 but not 3.750.
This type of error is repeated on all the other bandswitch positions. If I leave the rig running, sometimes is will revert to the correct mode. I assume this may be due to a problem with one of the 4 bit counters on the DR7 board.
I thought it would be a good idea to ask here if anyone had experienced the same fault, before opening up the rig.
Thanks in advance.
Henry - G3GIQ
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