I got a copy of the Service Manual In pdf. format and printed it off Got a question for you installed the PE5106B microprocessor and the Q657 and power her up. Still no go , still no BL+B 14.2 volts. or IL+B 9.1 volts. Also no SWD5V 5.2 volts and here's the kicker if you take the power away and reapply it you have the SWD5V pulsing on and off for about 3 sec. and SWDVDD 300ms signal PIN 1 for about 3 sec.at the same time. Only with keyboard unit is attached and nothing when not attached. Should it be a continuous signal and what is it actual frequency? I checked the main oscillator for that chip and it is right on frequency and stable. I removed IC451 PML004AF and Tuner out of circuit same thing. Any ideas on this one it's a dog. thanks Albert Walfield Albert Walfield's Electronics RR#3 Bridgewater Nova Scotia CANADA B4V 2W2 Phone or Fax # 902 543-9831 ***************************************************************************** Classifieds! Buy or Sell! http://sell.tech-assist.org The Tech Address Book: http://www.tech-assist.org/secure/tip/contact.htm Add a Repair Tip Here, or Change/Remove your Email Address: http://www.tech-assist.org/secure/tip/main.htm Lost Password: http://www.tech-assist.org and select "Lost your Login Info?". Email Archives: //www.freelists.org/archives/techassist/