Question about Yamaha DSP-AX1 10-Channel Amplifier
I have a Yamaha DSP-AX1 Amp purchased Aug.2000 with the following problems
When I first switch on the amp the memory settings are lost and defaults loaded ie all speaker levels set to 0db etc. The display shows a volume level of 60db, LD selected as the input, Concert Hall 1 selected, and no main speakers are on. I have to press the 'SPEAKER A' button on front of amp and go through the menus to set up all user options (speaker size,levels,graphic eq, DTS settings etc),also have to select 'LEVEL' button on remote to adjust volume level of each speaker as required.After these are re-entered I need to select the 'TEST' button on remote to check actual volume level of each speaker by using the test signal, and usually the rear left surround is low or no volume, the main right could be the same and one or both of front effect speakers could be low or no volume. I then swtch the amp off/on a few times by the remote and test each speaker again. This I keep doing until all volume levels are OK. If the volume levels are low just by leaving the amp 'on' and checking the volume levels they will correct themselves. Othertimes when I switch the amp on for the first time the memory settings are OK but the speaker volume level problem is still there and I go through the process of switching amp off/on by remote and checking. Dont know if I have 1 or 2 problems with amp or if they are related.Have changed the remote batteries and pressed reset as described in manual. Any advice would be appreciated. Thanks in advance.
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Posted on Jan 02, 2017
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See Troubleshooting Page 79
Impedance Selector in between settings
Generally speaking, an amp protects itself from heat, shorts, overloads and operator exuberance by refusing to turn on or stay on.
Overloads can be from excessive periods of high output or marginally low impedance loading by the speakers; and shorts would be wiring issues or a speaker blowing up.
You should be able to feel if it's hot. WHY is it overheating? Make sure it has sufficient ventilation on all sides and that vent holes are not blocked by dust balls. Ensure the fan (if equipped) is running as designed (some only operate on demand). Clean dust and debris from it.
If the amp comes back on after cooling, you're lucky. They only have so many self-protection cycles in their lives so continuously resetting or cycling their power without addressing the cause can do more harm than good.
If it protects immediately on a cool power up you should disconnect the speaker connections and try it 'naked'. If it comes up then diagnose which lead(s) are shorted. If it does not come up the problem is internal and should be left to an experienced and competent hands-on tech.
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