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Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems. |
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#1
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Sony STR-GX10ES tuner in Japanese mode
This Sony STR-GX10ES receiver works great apart from the tuner seems
to be in the wrong mode. It tunes from 79-90 MHz on FM and 522-1611 kHz on AM in 9kHz steps. I think this is the Japanese FM band. There's no obvious switch for changing tuning modes and I'm sure this receiver was made for the US market (120V with the manual in English). It doesn't respond to the key combination that's supposed to switch between 9kHz and 10kHz AM spacing. Is there a key combination for changing it back to US tuning mode? I remember seeing such combinations in the service manuals to other Sony receivers, but I don't have the service manual to this one. Andy Cuffe |
#2
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I'm not finding this info on this model. I guess you tried the "channel-up"
or "channel down" while plugging in, this changes tuning steps on some Sony models. A Yamaha receiver I worked on did this - it was a bad micro, since the tuning region options were hard-wired with jumpers. Mark Z. "Andy Cuffe" wrote in message ... This Sony STR-GX10ES receiver works great apart from the tuner seems to be in the wrong mode. It tunes from 79-90 MHz on FM and 522-1611 kHz on AM in 9kHz steps. I think this is the Japanese FM band. There's no obvious switch for changing tuning modes and I'm sure this receiver was made for the US market (120V with the manual in English). It doesn't respond to the key combination that's supposed to switch between 9kHz and 10kHz AM spacing. Is there a key combination for changing it back to US tuning mode? I remember seeing such combinations in the service manuals to other Sony receivers, but I don't have the service manual to this one. Andy Cuffe |
#3
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On Thu, 23 Dec 2004 06:19:50 -0600, "Mark D. Zacharias"
wrote: I'm not finding this info on this model. I guess you tried the "channel-up" or "channel down" while plugging in, this changes tuning steps on some Sony models. A Yamaha receiver I worked on did this - it was a bad micro, since the tuning region options were hard-wired with jumpers. Mark Z. Yes, I tried all those combinations. It looks like I will need the service manual to get anywhere. If anyone has a paper copy they could scan, all I should need is a scematic of everything around the main micro controller. Andy Cuffe |
#4
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Sony's service website is down, can't download the PDF. Assuming:
1. It's available, 2. Contains a schematic (older units may not) 3. You can take a large attachment I'd be happy to send it to you. I'll check back with their site Monday, it's been down since Friday. Mark Z. "Andy Cuffe" wrote in message ... On Thu, 23 Dec 2004 06:19:50 -0600, "Mark D. Zacharias" wrote: I'm not finding this info on this model. I guess you tried the "channel-up" or "channel down" while plugging in, this changes tuning steps on some Sony models. A Yamaha receiver I worked on did this - it was a bad micro, since the tuning region options were hard-wired with jumpers. Mark Z. Yes, I tried all those combinations. It looks like I will need the service manual to get anywhere. If anyone has a paper copy they could scan, all I should need is a scematic of everything around the main micro controller. Andy Cuffe |
#5
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On Thu, 23 Dec 2004 06:19:50 -0600, "Mark D. Zacharias"
wrote: I'm not finding this info on this model. I guess you tried the "channel-up" or "channel down" while plugging in, this changes tuning steps on some Sony models. A Yamaha receiver I worked on did this - it was a bad micro, since the tuning region options were hard-wired with jumpers. Mark Z. It turned out to be caused by a bad memory backup cap. Removing the old one was enough to reset it to US tuning mode. Installing a new one has it working as it should. I guess the voltage was low enough to corrupt the memory, but not low enough to reset it. Andy Cuffe |
#6
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Wow. Seeing this reminds me that Yamaha's have had bad backup caps which
leaked. Could yours have had leakage from the cap on the board? Mark Z. "Andy Cuffe" wrote in message ... On Thu, 23 Dec 2004 06:19:50 -0600, "Mark D. Zacharias" wrote: I'm not finding this info on this model. I guess you tried the "channel-up" or "channel down" while plugging in, this changes tuning steps on some Sony models. A Yamaha receiver I worked on did this - it was a bad micro, since the tuning region options were hard-wired with jumpers. Mark Z. It turned out to be caused by a bad memory backup cap. Removing the old one was enough to reset it to US tuning mode. Installing a new one has it working as it should. I guess the voltage was low enough to corrupt the memory, but not low enough to reset it. Andy Cuffe |
#7
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On Fri, 7 Jan 2005 04:33:34 -0600, "Mark D. Zacharias"
wrote: Wow. Seeing this reminds me that Yamaha's have had bad backup caps which leaked. Could yours have had leakage from the cap on the board? Mark Z. There was no leakage on the board, but it seemed to be confusing the micro. I've seen this before when the backup cap was failing. The worst was an 80's Fisher Hi-Fi VCR that would completely lock up in a power failure. The only way to make it work was to hold down a hidden reset button while plugging it in. Replacing the backup cap fix the problem. You wouldn't think a defective cap would be any worse than a fully discharged cap, but in some cases it causes weird problems. I've seem dozens of defective Elna and Panasonic backup caps, but I have never seen an NEC cap fail. Andy Cuffe |
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