Howdy Dave and thanks for the reply......at this point I've been sent a
schematic and am studying it. The current operational status of the
radio is that it has programmed frequencies and the display is in
CHANNEL mode and, as programmed, the radio transmits normally (including
DTMF) and receives normally. I can't change the display however or
enter into VFO mode. The rotary encoder works (just selects these
channels). The MR or memory recall button only functions to activate a
scan of the channels (by holding it in for >1sec). All pushbuttons
indicate with a beep when pressed (and a second beep is emitted after
approx 1.5 secs if held pressed). In reply to your questions......
Dave said:
Sorry, no tech info, but a couple of thoughts.
The fact that it beeps indicates that the key is being scanned, and that
the microprocessor is running. When you way "Press timeout" do you
mean that the "F" indicator lights, then goes out after an appropriate time
out period of no activity.
Agreed. The "F" indicator should show a second "F" on the LCD display
if I read the basic instruction manual correct - and it doesn't. There
is a beep when I press the button, and a second one approx 1.5 secs
later if held pressed (my reference to a timer), however the display
doesn't change with any attempt at a function change.
If so, this tells us that the key is being scanned correctly (interpreted as
Function). If no "F" indicator, there may be a fault in the keyboard matrix
which is causing the key to be interpreted as something else.
Good point - will investigate.
Do all of the other keys work normally? If so, and the "F" indicator is
lighting when you press Function, then it pretty much has to be a
"software" issue, the microprocessor is not acting on the key properly.
As mentioned above.....keys beep but no change can be made, no
alternative display or menu can be brought up.
If other functions don't work, then the radio could be locked - Press F
then LOCK (leftmost key iirc) to unlock it.
I'm not seeing a LOCK key except for a lock slide switch on the rear of
the mic. I doubt this does more than disable the mic keys but I tried
it with any combination I could think of - zippo.
If that't not it, try a full reset - hold MR while power-on, then release,
and when you get "all segments on" on the LCD, press MR again.
I had hoped this might work, but it doesn't.....As above, the button
will beep if pressed and cause a channel scan if pressed >1sec but
otherwise will not effect a reset when pressed in conjunction with the
power on (I'm used to having done this on other equipment). No "all
segments on" either.....just a power up to the channel display operating
condition.
That should restore the radio to factory defaults (you will use you
programmed memoryies etc.).
I'm currently looking at the diagram to see where the key-pressed "beep"
comes from......thinking if it's the micropro, then it is probably
receiving the command (but may be otherwise disabled at another pin).
If external, then I've got more digging to do.
