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Tech Head - The Technology Section
The Work Bench and Soldering Station
Marantz SR4200 amp issue
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<blockquote data-quote="Terryl" data-source="post: 1043702" data-attributes="member: 369937"><p>OK, I have found this.</p><p></p><p>[code]https://www.manualslib.com/manual/720887/Marantz-Sr4200.html?page=3#manual[/code]</p><p></p><p>If you look at page 8 you will find the input PCB schematic, (sorry it's poor quality) in the bottom left of the schematic you will see two IC chips use dfor the digital/optical inputs, one is an input buffer,(IC11) the other is the main input digital decoder, (IC12) on this chip there is a crystal oscillator, (X101) if this has gone into an intermittent startup stage it may need replacing, (seen it happen) this xtal** may be on the verge of its outside oscillating range due to age, you kicking it around by cycling the power may just keep it going.</p><p></p><p>**xtal, short for crystal oscillator.</p><p></p><p>It also could be IC12 it's self going bad, or maybe the buffer IC11, if you look on the xtal circuit there is a feed to other parts of the board,(labeled OSC) but due to the poor quality of the page it's hard to tell where the feed from the xtal is going.</p><p></p><p>The only way to trouble shoot this stage is with a frequency counter and an oscilloscope.</p></blockquote><p></p>
[QUOTE="Terryl, post: 1043702, member: 369937"] OK, I have found this. [code]https://www.manualslib.com/manual/720887/Marantz-Sr4200.html?page=3#manual[/code] If you look at page 8 you will find the input PCB schematic, (sorry it's poor quality) in the bottom left of the schematic you will see two IC chips use dfor the digital/optical inputs, one is an input buffer,(IC11) the other is the main input digital decoder, (IC12) on this chip there is a crystal oscillator, (X101) if this has gone into an intermittent startup stage it may need replacing, (seen it happen) this xtal** may be on the verge of its outside oscillating range due to age, you kicking it around by cycling the power may just keep it going. **xtal, short for crystal oscillator. It also could be IC12 it's self going bad, or maybe the buffer IC11, if you look on the xtal circuit there is a feed to other parts of the board,(labeled OSC) but due to the poor quality of the page it's hard to tell where the feed from the xtal is going. The only way to trouble shoot this stage is with a frequency counter and an oscilloscope. [/QUOTE]
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Marantz SR4200 amp issue
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