[ICOM] 7610 relay
Adam Farson
afarson at telus.net
Tue Sep 28 16:13:50 EDT 2021
Hi Ed,
Thanks - all understood. I am surprised that the MOSFET keying function
was unusable after the RL4001 contacts welded, as the two devices are
controlled by separate lines from the data multiplexer.
Armed with the service manual, you should be able to replace the relay
without much trouble. The board layout for the RF Unit clearly shows the
location of RL4001.
I have never had this situation, because I have been using solid-state
amplifiers for 33 years - first an IC-2KL, then a Yaesu Quadra which I
still own. The IC-2KL was keyed from the ACC2 socket, and I key the Quadra
from the SEND jack in the MOSFET setting to de-activate RL4001. After a
near-fatal HV accident at CERN in 1968, I vowed that my future amateur
station(s) would be 100% solid-state.
73, Adam VA7OJ/AB4OJ
-----Original Message-----
From: icom-bounces at mailman.qth.net [mailto:icom-bounces at mailman.qth.net]
On Behalf Of Ed K1EP
Sent: 28 September 2021 13:00
To: ICOM Reflector <icom at mailman.qth.net>
Subject: Re: [ICOM] 7610 relay
Hi Adam-
Thanks for the reply. I am familiar with the Icom way of implementing the
SEND function, as I have dealt with it as far back as the first 756. I
normally run low power, so the SEND issue usually doesn't affect me. If I
know that I will be using an amp, I will use a buffer. I have built many
for my use and for others. The situation was that I was in the Bahamas a
couple of years ago with the 7610 and it was supposed to be a LP operation
for the 7610. After a series of events, we ended up using an old tube amp
and I hadn't brought a buffer. The reed relay fused closed, which rendered
the FET useless. I built an opto isolated relay out of junk box parts to
"save the day" and used the ACC pins. The problem now is that I want to
sell the radio and a prospective buyer won't accept the ACC solution, no
matter how much I explain it. I would be satisfied with cutting it out if
it were easier! Thanks for the details.
reply to: K1EP at arrl.net
On Tue, Sep 28, 2021, 15:44 Adam Farson <afarson at telus.net> wrote:
> Hi Ed,
>
> The SEND relay is RL4001, a reed relay mounted on the bottom corner of
> the RF Unit board. To access the RF Unit, the Digi-Sel Units and a
> shield plate must be removed. You will need to remove the RF Unit to
> replace the relay.
>
> The IC-7610 has two menu-selectable amplifier keying options on the
> SEND RCA jack; RELAY (rated at 16V/500mA non-inductive) and MOSFET
> (rated at 250V 200mA non-inductive). Refer to IC-7610 user manual, p.
> 2-3. If the amplifier keying line exceeds these limits, an auxiliary
> keying buffer is required.
>
> You will need the service manual to perform this repair. If your 7610
> is still under warranty, an authorised Icom service centre will take
> care of it.
>
>
> 73, Adam VA7OJ/AB4OJ
>
>
>
> -----Original Message-----
> From: icom-bounces at mailman.qth.net
> [mailto:icom-bounces at mailman.qth.net]
> On Behalf Of Ed K1EP
> Sent: 26 September 2021 04:48
> To: icom at mailman.qth.net
> Subject: [ICOM] 7610 relay
>
> Has anyone replaced or repaired the internal amp keying relay in a 7610?
> Is it easily accessible or do you have to remove boards because it is
> buried somewhere?
>
> reply to: K1EP at arrl.net
> ----
> Your Moderator: Dick Flanagan K7VC: icom-owner at mailman.qth.net Icom
> Users
> Net: Sundays, 1700Z, 14.316 MHz Icom FAQ: http://www.qsl.net/icom/ To
> support QSL/QTH.net: http://www.qsl.net/donate.html
> ----
> Your Moderator: Dick Flanagan K7VC: icom-owner at mailman.qth.net Icom
> Users Net: Sundays, 1700Z, 14.316 MHz Icom FAQ:
> http://www.qsl.net/icom/ To support QSL/QTH.net:
> http://www.qsl.net/donate.html
>
----
Your Moderator: Dick Flanagan K7VC: icom-owner at mailman.qth.net Icom Users
Net: Sundays, 1700Z, 14.316 MHz Icom FAQ: http://www.qsl.net/icom/ To
support QSL/QTH.net: http://www.qsl.net/donate.html
More information about the Icom
mailing list