Joe -
You got a key plugged in? If so, either unplug or short.
Does Pin 7 of V11 read 0V? If so, then
Same conditions, measure the voltage on both sides of
RFC2 and
R36
One will measure 0 VDC on one end and +140 on the other. That's the bad
one!
If Pin 7 is +140, then
Relay contact (N.C. contact of MUTE.)
If not this, will require further checking.
73, Garey - K4OAH
Glen Allen, VA
Drake 2-B, 4-B, C-Line& TR-4/C Service Supplement CDs
<www.k4oah.com>
Joe Loverti wrote:
Hi guys... I'm needing some technical advice about some odd voltage
readings with my ailing T4XB.
I ran voltage checks tonight and compared them with the chart in the
manual. All read normal except these:
V5 – 6JB6 – Pins 3 and 9 both read: 140V (manual says should read: .3V
and .9V respectively)
V6 – 6JB6 – Pins 3 and 9 both read: 140V (manual says should read: .3V
and .9V respectively)
V3 – 6AU6 – Pin 7 reads: 140V (manual says it should read: 2.35V)
Voltages were taken with the function switch in Tune (gain fully
counter clockwise)
Made no difference switch function switch to SSB.
Those voltages seem really out of wack... got any ideas?
Thanks,
Joe
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