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Thanks Steve. We are down to the dreaded Logic Board on this one. The CPU is running and making system clock but none of the other clock outputs are doing anything. At the moment I have nothing in the screen and nothing into or out of the encoder. Wish I had an extension cable so I could get to the bottom of the logic board while it is running. I have seen more difficult from a serviceability standpoint but not many!
Warren - WA8TOD
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On Sep 8, 2017, at 4:13 PM, w3ahl@... [ic7000] < ic7000@...> wrote:
?
There are several errors in the schematics and you just found another one. I traced the PCB artwork in the Service Manual and the signal that is labeled GND is actually an audio return "ground" for the AFO audio output. ?It goes to the speaker jack on the right edge of the Display unit. ?
So it appears that the only DC ground is indeed the YGND, which isn't a very good design. ?But I'm sure there's a reason they had to make a compromise.
As to your display symptom, I haven't had to work on a unit that had that problem. ?If you have an external monitor that will take an NTSC signal, then plug it into the rear video output jack. ?If you get a picture, then the video signal from the main unit is good and the problem is probably in the display head. ?If you don't get a picture on the external monitor, then there is a problem with video encoder or LCD control circuits on the Logic board.
Steve, W3AHL ---In ic7000@..., wrote : I am working on a "hangar queen" IC-7000 with multiple problems. I am wondering if others who have been deep inside the 7K have noted this issue: While the Service Manual a connection of both YGND and GND to the board foil on the Display Board, there is no such connection in my unit. The ground return for the entire front panel is via the shield on the video cable. There is no ground continuity between the Main Unit and the Display Unit unless the video cable is connected. One result of this is the unit cannot be turned on without the video cable plugged into the Main Unit. This is perhaps a fault in my unit but I have painstakingly traced the lands on both sides of the Display Unit and I find no connection between the two grounds as indicated on the schematic. Is this a known issue/feature or is this perhaps a symptom of my problem(s). Problems at the moment are a display that remains in black, intermittently displaying unlocked video. Warren Allgyer - WA8TOD
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I’ve done a lot of work on 7000’s. As far as I know, there were no extender cables available to the service centers allowing the lifting of the logic unit. You would have to fabricate them from scratch. There are only a couple of circuits in the logic unit normally serviced by Icom. They are the battery and the CI-V components. An update applied to earlier units in an attempt to halt driver unit oscillation changed some components in the logic unit. Otherwise, the logic unit was normally just replaced. It was considered an unrepairable part. Add to this, there is a version of the logic unit that is known as faulty. Icom replaced them outright under product warranty but that has long since expired. ? Your best move at this point is to find another known good 7000. Swap the logic units to see what happens. That will confirm the track you’re on is the right one. Do the same thing with the control heads. However, only put the good head on your radio. There is a common failure in the control head that can damage the radio. It’s repairable but why add more work to the deal. I have never damaged a logic unit from swapping it between radios so don’t worry about that. ? Thank you, ? Paul W. Hansen, W6XA ? ?
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From: ic7000@... [mailto:ic7000@...]
Sent: September 08, 2017 22:32
To: ic7000@...
Subject: Re: [IC-7000] Re: Front panel troubleshooting?
Thanks Steve. We are down to the dreaded Logic Board on this one. The CPU is running and making system clock but none of the other clock outputs are doing anything. At the moment I have nothing in the screen and nothing into or out of the encoder. Wish I had an extension cable so I could get to the bottom of the logic board while it is running. I have seen more difficult from a serviceability standpoint but not many! ? There are several errors in the schematics and you just found another one. I traced the PCB artwork in the Service Manual and the signal that is labeled GND is actually an audio return "ground" for the AFO audio output. ?It goes to the speaker jack on the right edge of the Display unit. ? So it appears that the only DC ground is indeed the YGND, which isn't a very good design. ?But I'm sure there's a reason they had to make a compromise. As to your display symptom, I haven't had to work on a unit that had that problem. ?If you have an external monitor that will take an NTSC signal, then plug it into the rear video output jack. ?If you get a picture, then the video signal from the main unit is good and the problem is probably in the display head. ?If you don't get a picture on the external monitor, then there is a problem with video encoder or LCD control circuits on the Logic board. Steve, W3AHL
---In ic7000@..., <allgyer@...> wrote : I am working on a "hangar queen" IC-7000 with multiple problems. I am wondering if others who have been deep inside the 7K have noted this issue:
While the Service Manual a connection of both YGND and GND to the board foil on the Display Board, there is no such connection in my unit. The ground return for the entire front panel is via the shield on the video cable. There is no ground continuity between the Main Unit and the Display Unit unless the video cable is connected. One result of this is the unit cannot be turned on without the video cable plugged into the Main Unit.
This is perhaps a fault in my unit but I have painstakingly traced the lands on both sides of the Display Unit and I find no connection between the two grounds as indicated on the schematic.
Is this a known! issue/feature or is this perhaps a symptom of my problem(s).
Problems at the moment are a display that remains in black, intermittently displaying unlocked video.
Warren Allgyer - WA8TOD ?
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Hi Paul
I have a 7000 with no audio on rx and will not tx.
I think its the logic board
are these boards available?
james
|
Is this for me?
?
Thank You
?
Paul W. Hansen, W6XA
Amateur Radio Service
2134 Carthage Road
Tucker, GA 30084
(864) 222-3539
www.amateurradioservice.com
?
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From: [email protected]
[mailto:[email protected]] On Behalf Of James Tiberius via groups.io
Sent: Sunday, November 3, 2024 08:53
To: [email protected]
Subject: Re: [ic7000] [IC-7000] Re: Front panel troubleshooting
?
I have a 7000 with no audio on rx and will not tx.
I think its the logic board
are these boards available?
|
Hi Paul Yes just wanted to reach out to see if you have any experience with the logic board on the 7000 My 7000 could have the fault? Regards
On Sun, Nov 3, 2024 at 10:13 PM, Paul Hansen <pwhansen@...> wrote:
Is this for me?
?
Thank You
?
Paul W. Hansen, W6XA
Amateur Radio Service
2134 Carthage Road
Tucker, GA 30084
(864) 222-3539
www.amateurradioservice.com
?
?
I have a 7000 with no audio on rx and will not tx.
I think its the logic board
are these boards available?
|
Logic units have been a
relatively high failure item. Icom never even attempted to repair them except
for the CI-V components. The latest price list I have from Icom does list the
part as being available. It’s US$353.29. Ouch!
?
Thank You
?
Paul W. Hansen, W6XA
Amateur Radio Service
2134 Carthage Road
Tucker, GA 30084
(864) 222-3539
www.amateurradioservice.com
?
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From: [email protected]
[mailto:[email protected]] On Behalf Of James Tiberius via groups.io
Sent: Sunday, November 3, 2024 20:48
To: [email protected]
Subject: Re: [ic7000] [IC-7000] Re: Front panel troubleshooting
?
Hi Paul
Yes just wanted to reach out to see if you have any
experience with the logic board on the 7000
My 7000 could have the fault?
James?
?
On
Sun, Nov 3, 2024 at 10:13 PM, Paul Hansen
Is
this for me?
?
Thank
You
?
Paul
W. Hansen, W6XA
Amateur
Radio Service
2134
Carthage Road
Tucker,
GA 30084
(864)
222-3539
www.amateurradioservice.com
?
?
I have a 7000 with no audio on rx and will not
tx.
I think its the logic board
are these boards available?
|
Thanks Paul Yes that's expensive. Looking for a parts radio now Regards?
On Mon, Nov 4, 2024 at 8:34 AM, Paul Hansen <pwhansen@...> wrote:
Logic units have been a
relatively high failure item. Icom never even attempted to repair them except
for the CI-V components. The latest price list I have from Icom does list the
part as being available. It’s US$353.29. Ouch!
?
Thank You
?
Paul W. Hansen, W6XA
Amateur Radio Service
2134 Carthage Road
Tucker, GA 30084
(864) 222-3539
www.amateurradioservice.com
?
?
Hi Paul
Yes just wanted to reach out to see if you have any
experience with the logic board on the 7000
My 7000 could have the fault?
James?
?
On
Sun, Nov 3, 2024 at 10:13 PM, Paul Hansen
Is
this for me?
?
Thank
You
?
Paul
W. Hansen, W6XA
Amateur
Radio Service
2134
Carthage Road
Tucker,
GA 30084
(864)
222-3539
www.amateurradioservice.com
?
?
I have a 7000 with no audio on rx and will not
tx.
I think its the logic board
are these boards available?
|
James,
The datasheet for IC551 is on the internet and maybe worth a look.
You say you have the analogue signal at IC551 is it pin 4. Can you see anything at R611, R615, or the filter device IC601 pin 5.
Do you see a digital signal from IC551 pin 13? Do you have a logic analyser you could use?
Maybe we can continue off Group to save annoying others. My callsign + gmail.
Cheers
Geoff
On Mon, Nov 4, 2024 at 8:35?AM James Tiberius via <nono2212000= [email protected]> wrote: Thanks PaulYes that's expensive. Looking for a parts radio now Regards? James? On Mon, Nov 4, 2024 at 8:34 AM, Paul Hansen
Logic units have been a
relatively high failure item. Icom never even attempted to repair them except
for the CI-V components. The latest price list I have from Icom does list the
part as being available. It’s US$353.29. Ouch!
?
Thank You
?
Paul W. Hansen, W6XA
Amateur Radio Service
2134 Carthage Road
Tucker, GA 30084
(864) 222-3539
?
?
Hi Paul
Yes just wanted to reach out to see if you have any
experience with the logic board on the 7000
My 7000 could have the fault?
James?
?
On
Sun, Nov 3, 2024 at 10:13 PM, Paul Hansen
Is
this for me?
?
Thank
You
?
Paul
W. Hansen, W6XA
Amateur
Radio Service
2134
Carthage Road
Tucker,
GA 30084
(864)
222-3539
?
?
I have a 7000 with no audio on rx and will not
tx.
I think its the logic board
are these boards available?
|
Hi Geoff
Nothing out of IC551 pins 25 and 26 which feed IC601 , ic601 is underneath so very hard to get to but checked on ic551 pins 25 and 26 and nothing at all with a good clean signal on pin 4. i haven't checked pin 13 on 551 yet but will try and get to it by the end of the week. Also thinking about ordering another chip to replace ic551 - they are relatively cheap and worth a shot. If it doesn't fix the problem then the issue lies somewhere else
James
|
Geoff, These posts on troubleshooting are interesting, not annoying. They're good reading. Bob W4JFA
James,
The datasheet for IC551 is on the internet and maybe worth a look.
You say you have the analogue signal at IC551 is it pin 4. Can you see anything at R611, R615, or the filter device IC601 pin 5.
Do you see a digital signal from IC551 pin 13? Do you have a logic analyser you could use?
Maybe we can continue off Group to save annoying others. My callsign + gmail.
Cheers
Geoff
On Mon, Nov 4, 2024 at 8:35?AM James Tiberius via <nono2212000= [email protected]> wrote: Thanks PaulYes that's expensive. Looking for a parts radio now Regards? James? On Mon, Nov 4, 2024 at 8:34 AM, Paul Hansen
Logic units have been a
relatively high failure item. Icom never even attempted to repair them except
for the CI-V components. The latest price list I have from Icom does list the
part as being available. It’s US$353.29. Ouch!
?
Thank You
?
Paul W. Hansen, W6XA
Amateur Radio Service
2134 Carthage Road
Tucker, GA 30084
(864) 222-3539
?
?
Hi Paul
Yes just wanted to reach out to see if you have any
experience with the logic board on the 7000
My 7000 could have the fault?
James?
?
On
Sun, Nov 3, 2024 at 10:13 PM, Paul Hansen
Is
this for me?
?
Thank
You
?
Paul
W. Hansen, W6XA
Amateur
Radio Service
2134
Carthage Road
Tucker,
GA 30084
(864)
222-3539
?
?
I have a 7000 with no audio on rx and will not
tx.
I think its the logic board
are these boards available?
|
Hi all
I checked ic551 pins 10 - 14 and only pin 10 has the 24mhz clock, 11-14 are 0v no activity at all- even from a power off to on state.
I ordered a replacement IC from China - will take a week or so to arrive.
I will replace the chip and let you know how it goes
?
James
VK2VJZ
|
Geoff
Ditto: educational not annoying
Kurt KD6LZV
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On Nov 5, 2024, at 12:39 PM, James Tiberius via groups.io <nono2212000@...> wrote:
? Hi all
I checked ic551 pins 10 - 14 and only pin 10 has the 24mhz clock, 11-14 are 0v no activity at all- even from a power off to on state.
I ordered a replacement IC from China - will take a week or so to arrive.
I will replace the chip and let you know how it goes
?
James
VK2VJZ
|
James can you capacitively feed an audio signal, no greater than say 3Vpp, onto the pins 25/26 and see if you can hear/see any reaction. Monitor the signal at these pins with a CRO to see if its loaded down at all.
Also, pay some close attention to all the ribbon cables that run from the Logic board to the Main board. Look for proper seating and damaged tracks on these cables. Its quite possible someone before you has had a go at this radio.
Geoff
Bob, I hear you. :-)
On Wed, Nov 6, 2024 at 7:39?AM James Tiberius via <nono2212000= [email protected]> wrote: Hi all
I checked ic551 pins 10 - 14 and only pin 10 has the 24mhz clock, 11-14 are 0v no activity at all- even from a power off to on state.
I ordered a replacement IC from China - will take a week or so to arrive.
I will replace the chip and let you know how it goes
?
James
VK2VJZ
|
Hi Geoff
Good idea. At least it will verify output circuits.
Will let you know how it goes .
James?
|
?
This just posted on IC-7000 no rx and no sound out from speaker topic.
?
"I think this Topic has got crossed over somehow [IC-7000] Re: Front panel troubleshooting which happened around Nov 4. There are a number of replies that have not appeared here but on the Front Panel troubleshooting? one.
?
Best we continue? on IC-7000 no rx and no sound out from speaker from Jame's original posting of Oct 30."
?
Sorry to those of this topic for the mistake.
?
Geoff
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Bob