[ICOM] 7610 relay

Wed Sep 29 12:16:46 EDT 2021

Thank you. I doubt I will have/use an amp, but one never knows.

Larry Hinton
K7YBZ
Sent from my iPad

> On Sep 28, 2021, at 20:24, Adam Farson <afarson at telus.net> wrote:
> 
> 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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> ----
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> Net: Sundays, 1700Z, 14.316 MHz Icom FAQ: http://www.qsl.net/icom/ To
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> ----
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