[ICOM] 7610 relay

Tue Sep 28 22:54:28 EDT 2021

Hi Larry,

There is no relay issue. As long as the amplifier keying line is within the
stated specs (16V/0.5A inductive for the relay, 250V/0.2A non-inductive for
the MOSFET) the 7610's keying circuit will not fail.

If you plan to get an amplifier whose keying line exceeds these ratings, I
strongly recommend a keying buffer such as the Ameritron ARB-704.

The AV-680 should work well, but the 80m band will be narrow. I have a
Cushcraft R8 which is similar but covers 40 - 6m inclusive,

73, Adam VA7OJ/AB4OJ

-----Original Message-----
From: icom-bounces at mailman.qth.net [mailto:icom-bounces at mailman.qth.net] On
Behalf Of Larry Hinton
Sent: 28 September 2021 18:36
To: ICOM Reflector <icom at mailman.qth.net>
Subject: Re: [ICOM] 7610 relay

Adam,

Can you shed some more light on the relay issue?

I just bought a new 7610 a few months ago. Still have yet to get on the air.
I ordered a Hy-Gain AV-680 back in May and it arrived earlier this month.
Now to get the antenna up and the rest functional. I have not had a HF
station since 1974. I am looking forward to it.

Larry Hinton
K7YBZ
Sent from my iPad

> On Sep 28, 2021, at 13:15, Adam Farson <afarson at telus.net> wrote:
>
> 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
>> ----
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> ----
> Your Moderator: Dick Flanagan K7VC: icom-owner at mailman.qth.net Icom
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> ----
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----
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