#Yamaha psr e403 not working Patch#
#Yamaha psr e403 not working full#
#Yamaha psr e403 not working series#

Now, which power source are you using, or if using batteries, could a couple of cells be installed backwards polarity and thus cancelling out some of the total series string voltage. That should be on up around 9VDC, being only down at that 6VDC level after it has passed through IC151 for other lower level circuitry. you indicate that you were finding only 6VDC as the main power input to the POWER amp IC551 at its pin 5. Look to the right and the DC power input, which shows this unit having an option of using 6 D cells in series to get 9VDC as the power source OR the option of use of a 12VDC adapter which should drop 12VDC down to 9 VDC. Standing by to further fill in and trade info. CD player - a DVD players R or L audio output -VHS or BETA tape players and their AF output - another component system with Tuner AF output -tape output.

#Yamaha psr e403 not working Patch#

Also we will need a shielded, male at both ends, RCA patch cord and that prior isolation capacitor that was being used.ДЄF sources. If no luck, think about your having additional audio equipment, on which, we need a line level audio output from something that typically does that outputting thru a female RCA jack. and you are LUCKY ! you then just might get the loudest tone coming from that unit that you have heard since all was last working normally. If the moon is in the right solar positioning. If the unit is powered up and in normal working settings and conditions, when that cap is bridged between those points. itвЂ™s all being in accordance to phase relationships. There is a 50/50 chance of a good result. Your headphone jack merely switches audio out between either the headphones or the speakers, with no intermediary lower drive level going exclusively to the headphones.Дid you get the identical decreased audio level effect with the old IC551 AF chip in circuit ?ДЄn initial test requires a wire leaded ceramic-poly-paper capacitor of 0.01 thru 0.1 ufd range, such that its lead ends can bridge from pin 1 over to pin 12 of the IC551.

YouвЂ™re telling us of having NO volume control action is certainly suggestive of your problem being in the AF output stage.

#Yamaha psr e403 not working full#

Initially, can you confirm for us, that you have the full operational DC supply voltage at pin 5 of the IC551 AF out?ДЄlso, can you confirm that IC 502 is properly receiving a proper +6 vdc at its pin 8?

Originating, all the way from its point of origin over at pins 11/12 and 9/10 as the analog R and L audio outputs at the Digital Analog Converter IC. I just prepped up the block diagram, as it seems to have all referencing output to the audio flow thru the system. Since you now say that full familiarity with your equipmentвЂ™s normalcy in the past, now confirms that the present volume is 1/2 or less than it used to be, therefore you remember that level as a reference of its prior capabilities.