Maintenance manual
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HI guys, does it help?
There is a stamp on my manual.
GL 73 Viktor
贵别濒补诲ó:[email protected] <[email protected]>, meghatalmazó: Kory Oldham W4RZ via groups.io <Kory@...>
贰濒办ü濒诲惫别:?2025. január 27., hétf? 2:35 颁í尘锄别迟迟:[email protected] <[email protected]> 罢á谤驳测:?[Icom-746Pro] Maintenance manual ?
Does anyone have a working download to the maintenance manual? I tried downloaded the one listed in files that is zoomable but it appears to be corrupt or a broken link. I can't seem to locate my copy.?
?
Thanks
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开云体育From the IC-746Pro Service Manual S-13811HZ-C2-q, Jul. 2009 ? ? ? Bob, I agree with the notion that the heat is not dissipated through the plastic but rather through the leads. In many SMDs that produce heat there are integrated heat sinks that solder to the PC board and wick the heat away from the device. Despite the argument that the heat stays below the manufacturer’s spec, I suspect heat may still be a contributing factor. With the increasing popularity of FT8 some hams tend to run their radios at full or near-full output for prolonged periods of time. This causes increased temp inside the radio. This can be exasperated by airflow restriction around the vents of the radio, and unrealized failure of the internal fan. IC151 may be able to dissipate the normal heat it generates but with the increased internal temperature and lack of a large ground plane on the PC board around the chip, it may result in exceeding the manufacturer’s temp spec. IC151 is in the edge of the PC board so heat dissipation away from it is a bit hindered. ? I believe the static issue was addressed in one of the service bulletins. It’s fix is the addition of D121 and D122 off of J121. Its in the above schematic crop. ? 73, ? Scott, W1NB ? ? ? ? ? ? From: [email protected] <[email protected]> On Behalf Of Bob Naylor via groups.io ? Scott, In the past I've read a lot about this and now that this subject comes back up I've reread some? I'm anxious to see your newer schematic. One thing I've read many times and I agree with 100%, although I've never had to change mine (non pro), is that if the IC does NOT dissipate?heat through the plastic case, applying a heat sink on the case can actually hold in more heat. No heat would, or can be dissipated through the plastic so it will hold heat in?just as insulation in your attic holds the heat in the house. I have read that these IC151's dissipate?heat through the ground legs, all 6s of them, so my thinking?is a lot of metal of some sort soldered to the ground legs to act as a heat sink is a good idea. Somewhere on line I saw a picture of a guy that made a piece of copper that soldered to all the ground legs. This was added metal in addition the?the circuit board traces. This makes sense to me as far as dissipating?heat. ? Now another thing?I've read is, heat is not the?problem, although heat is never good for?solid state devices, it's static discharge which?is the?schematic that you're looking for to show us Scott. Since the heat is running less than the manufacturer?is stating is safe, is that actually correct? That would be? relying on the?manufacturer's testing years ago.? What does everyone think on this? Is this beating a dead horse? Maybe, but it is an important subject to keep these fine radios working. Bob W4JFA ? On Mon, Jan 27, 2025 at 7:40?AM Scott Madison via <W1NB=[email protected]> wrote:
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开云体育Not sure why the schematic blurred. It was clean on my email draft. Hopefully the\is attachment doesn’t get removed. ? From: [email protected] <[email protected]> On Behalf Of Scott Madison via groups.io
Sent: Monday, January 27, 2025 9:19 AM To: [email protected] Subject: Re: [Icom-746Pro] Maintenance manual ? From the IC-746Pro Service Manual S-13811HZ-C2-q, Jul. 2009 ? ? ? Bob, I agree with the notion that the heat is not dissipated through the plastic but rather through the leads. In many SMDs that produce heat there are integrated heat sinks that solder to the PC board and wick the heat away from the device. Despite the argument that the heat stays below the manufacturer’s spec, I suspect heat may still be a contributing factor. With the increasing popularity of FT8 some hams tend to run their radios at full or near-full output for prolonged periods of time. This causes increased temp inside the radio. This can be exasperated by airflow restriction around the vents of the radio, and unrealized failure of the internal fan. IC151 may be able to dissipate the normal heat it generates but with the increased internal temperature and lack of a large ground plane on the PC board around the chip, it may result in exceeding the manufacturer’s temp spec. IC151 is in the edge of the PC board so heat dissipation away from it is a bit hindered. ? I believe the static issue was addressed in one of the service bulletins. It’s fix is the addition of D121 and D122 off of J121. Its in the above schematic crop. ? 73, ? Scott, W1NB ? ? ? ? ? ? From: [email protected] <[email protected]> On Behalf Of Bob Naylor via groups.io ? Scott, In the past I've read a lot about this and now that this subject comes back up I've reread some? I'm anxious to see your newer schematic. One thing I've read many times and I agree with 100%, although I've never had to change mine (non pro), is that if the IC does NOT dissipate?heat through the plastic case, applying a heat sink on the case can actually hold in more heat. No heat would, or can be dissipated through the plastic so it will hold heat in?just as insulation in your attic holds the heat in the house. I have read that these IC151's dissipate?heat through the ground legs, all 6s of them, so my thinking?is a lot of metal of some sort soldered to the ground legs to act as a heat sink is a good idea. Somewhere on line I saw a picture of a guy that made a piece of copper that soldered to all the ground legs. This was added metal in addition the?the circuit board traces. This makes sense to me as far as dissipating?heat. ? Now another thing?I've read is, heat is not the?problem, although heat is never good for?solid state devices, it's static discharge which?is the?schematic that you're looking for to show us Scott. Since the heat is running less than the manufacturer?is stating is safe, is that actually correct? That would be? relying on the?manufacturer's testing years ago.? What does everyone think on this? Is this beating a dead horse? Maybe, but it is an important subject to keep these fine radios working. Bob W4JFA ? On Mon, Jan 27, 2025 at 7:40?AM Scott Madison via <W1NB=[email protected]> wrote:
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开云体育Trying one more time with a jpg file. ? From: [email protected] <[email protected]> On Behalf Of Scott Madison via groups.io
Sent: Monday, January 27, 2025 9:23 AM To: [email protected] Subject: Re: [Icom-746Pro] Maintenance manual ? Not sure why the schematic blurred. It was clean on my email draft. Hopefully the\is attachment doesn’t get removed. ? From: [email protected] <[email protected]> On Behalf Of Scott Madison via groups.io ? From the IC-746Pro Service Manual S-13811HZ-C2-q, Jul. 2009 ? ? ? Bob, I agree with the notion that the heat is not dissipated through the plastic but rather through the leads. In many SMDs that produce heat there are integrated heat sinks that solder to the PC board and wick the heat away from the device. Despite the argument that the heat stays below the manufacturer’s spec, I suspect heat may still be a contributing factor. With the increasing popularity of FT8 some hams tend to run their radios at full or near-full output for prolonged periods of time. This causes increased temp inside the radio. This can be exasperated by airflow restriction around the vents of the radio, and unrealized failure of the internal fan. IC151 may be able to dissipate the normal heat it generates but with the increased internal temperature and lack of a large ground plane on the PC board around the chip, it may result in exceeding the manufacturer’s temp spec. IC151 is in the edge of the PC board so heat dissipation away from it is a bit hindered. ? I believe the static issue was addressed in one of the service bulletins. It’s fix is the addition of D121 and D122 off of J121. Its in the above schematic crop. ? 73, ? Scott, W1NB ? ? ? ? ? ? From: [email protected] <[email protected]> On Behalf Of Bob Naylor via groups.io ? Scott, In the past I've read a lot about this and now that this subject comes back up I've reread some? I'm anxious to see your newer schematic. One thing I've read many times and I agree with 100%, although I've never had to change mine (non pro), is that if the IC does NOT dissipate?heat through the plastic case, applying a heat sink on the case can actually hold in more heat. No heat would, or can be dissipated through the plastic so it will hold heat in?just as insulation in your attic holds the heat in the house. I have read that these IC151's dissipate?heat through the ground legs, all 6s of them, so my thinking?is a lot of metal of some sort soldered to the ground legs to act as a heat sink is a good idea. Somewhere on line I saw a picture of a guy that made a piece of copper that soldered to all the ground legs. This was added metal in addition the?the circuit board traces. This makes sense to me as far as dissipating?heat. ? Now another thing?I've read is, heat is not the?problem, although heat is never good for?solid state devices, it's static discharge which?is the?schematic that you're looking for to show us Scott. Since the heat is running less than the manufacturer?is stating is safe, is that actually correct? That would be? relying on the?manufacturer's testing years ago.? What does everyone think on this? Is this beating a dead horse? Maybe, but it is an important subject to keep these fine radios working. Bob W4JFA ? On Mon, Jan 27, 2025 at 7:40?AM Scott Madison via <W1NB=[email protected]> wrote:
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开云体育Reduced size ? ? From: [email protected] <[email protected]> On Behalf Of Scott Madison via groups.io
Sent: Monday, January 27, 2025 9:26 AM To: [email protected] Subject: Re: [Icom-746Pro] Maintenance manual ? Trying one more time with a jpg file. ? From: [email protected] <[email protected]> On Behalf Of Scott Madison via groups.io ? Not sure why the schematic blurred. It was clean on my email draft. Hopefully the\is attachment doesn’t get removed. ? From: [email protected] <[email protected]> On Behalf Of Scott Madison via groups.io ? From the IC-746Pro Service Manual S-13811HZ-C2-q, Jul. 2009 ? ? ? ? Bob, I agree with the notion that the heat is not dissipated through the plastic but rather through the leads. In many SMDs that produce heat there are integrated heat sinks that solder to the PC board and wick the heat away from the device. Despite the argument that the heat stays below the manufacturer’s spec, I suspect heat may still be a contributing factor. With the increasing popularity of FT8 some hams tend to run their radios at full or near-full output for prolonged periods of time. This causes increased temp inside the radio. This can be exasperated by airflow restriction around the vents of the radio, and unrealized failure of the internal fan. IC151 may be able to dissipate the normal heat it generates but with the increased internal temperature and lack of a large ground plane on the PC board around the chip, it may result in exceeding the manufacturer’s temp spec. IC151 is in the edge of the PC board so heat dissipation away from it is a bit hindered. ? I believe the static issue was addressed in one of the service bulletins. It’s fix is the addition of D121 and D122 off of J121. Its in the above schematic crop. ? 73, ? Scott, W1NB ? ? ? ? ? ? From: [email protected] <[email protected]> On Behalf Of Bob Naylor via groups.io ? Scott, In the past I've read a lot about this and now that this subject comes back up I've reread some? I'm anxious to see your newer schematic. One thing I've read many times and I agree with 100%, although I've never had to change mine (non pro), is that if the IC does NOT dissipate?heat through the plastic case, applying a heat sink on the case can actually hold in more heat. No heat would, or can be dissipated through the plastic so it will hold heat in?just as insulation in your attic holds the heat in the house. I have read that these IC151's dissipate?heat through the ground legs, all 6s of them, so my thinking?is a lot of metal of some sort soldered to the ground legs to act as a heat sink is a good idea. Somewhere on line I saw a picture of a guy that made a piece of copper that soldered to all the ground legs. This was added metal in addition the?the circuit board traces. This makes sense to me as far as dissipating?heat. ? Now another thing?I've read is, heat is not the?problem, although heat is never good for?solid state devices, it's static discharge which?is the?schematic that you're looking for to show us Scott. Since the heat is running less than the manufacturer?is stating is safe, is that actually correct? That would be? relying on the?manufacturer's testing years ago.? What does everyone think on this? Is this beating a dead horse? Maybe, but it is an important subject to keep these fine radios working. Bob W4JFA ? On Mon, Jan 27, 2025 at 7:40?AM Scott Madison via <W1NB=[email protected]> wrote:
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On Sun, Jan 26, 2025 at 08:35 PM, Kory Oldham W4RZ wrote:
I have good, zoomable, copies of the 2002 and 2009 Service Manual for the IC-746Pro. I would be happy to upload them to the "Files" section but it seems that requires privileges my account does not have (I can neither create a subdir there, nor upload anything). If the Admin for this group contacts me I'd be happy to pass them along.
?
-Rob-
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On Mon, Jan 27, 2025 at 9:18?AM Scott Madison via groups.io
<W1NB@...> wrote:
I didn't realize there were different versions of the service manual but ... DUH ... they changed stuff during production. The version I have is the same (though the "q" on mine is actually a 1 in a circle, which probably doesn't copy/paste right. Oh. I have upload rights. <shrug> Both versions are there, now, and tagged with the year. If anyone has other versions I'd be happy to upload those. -- Peter Laws | VE[23]UWY / N5UWY | plaws0 gmail com | Travel by Train! |
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Uhhhh ... not sure ...
*I* see them but of course that means little. Looking for a "keep file hidden from mortals" button to unclick ... On Mon, Jan 27, 2025 at 4:30?PM Bob Naylor via groups.io <W4JFABob@...> wrote:
-- Peter Laws | VE[23]UWY / N5UWY | plaws0 gmail com | Travel by Train! |
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Well ... if you send an email with a photo attached, 开云体育 seems
to ensmallen it (I assume that's the opposite of embiggen) and store it in the archive that way making it worthless. I doesn't *seem* to do that with PDFs but ... Hmm. On Mon, Jan 27, 2025 at 5:34?PM Peter Laws via groups.io <plaws0@...> wrote:
-- Peter Laws | VE[23]UWY / N5UWY | plaws0 gmail com | Travel by Train! |
Rob Beckers (VA3BUA & PA3BUA)
Peter Laws
