Ed Eastman wrote:
spacealbum wrote:I have an original Apple II which unfortunately is not working any more. The power supply gives correct voltages, but there is no beep when I power it up and no proper signal appears on the screen, even after a reset / ctrl-reset.Turn it on, do you get he power light? (There are two, a light on the keyboard and an LED on the main board that light when power is applied.) If so then the board is getting power. (Doesn't rule out the power supply though.)Is the speaker plugged in? There is an LED that lights when the speaker is supposed to beep, I do not remember if it works when the speaker is attached though.Start by turning it off and removing all the cards and pull the keyboard connection. Then turn it on again, get the power light on the main board? Get a beep or a blink on the speaker LED? Get video? If it works now, check the cards and keyboard for a short/ corrosion/ blown capacitors.
Actually, Apples prior to the //e do not have LEDs on the board. But if the power light on the keyboard comes on, then the main board is getting +5v.
If it still doesn't work, reseat all the connectors and chips on the main board.
This will almost certainly fix the problem if the power supply is OK. -michael Music synthesis for 8-bit Apple II's! Home page: http://members.aol.com/MJMahon/ "The wastebasket is our most important design tool--and it is seriously underused."