User:Taylorraymond

The Selection Cycle. As the latch bar soliniod is energised the letter and number keys can be operated. As the name suggests, the keys when pressed are latched. The pre- selection cycle begins. The N1,2,3.4 motor is energised,( situated on the left hand side of the record magazine) N1 are the carry over contacts,N4 operates the subtract soliniod, N3 is used as the latch bar hold. As the N1,2,3,4 motor turns it closes the scan contacts, (situated next to the N1.N2,N3,N4 contacts)this fuction allows the carridge to scan.I will post an operating diagram to assist in the explanation of fuctions. As the subtract soliniod operates this causes the write in arm that is attached to the subtract soliniod to close(wipe)across the write in contact.The N3 contact opens and de-latches the key bank, if creit is still established it will re-energise the latch bar soliniod on completion of the N1,2,3,4 motor cycle. 4 scans are made, 2 up, 2 down. reversing levers are situated on either side of the magazine.the reversing switches are situated on the rear of the magazine behind the N1,2,3,4, motor assembly.As the carridge scans it operates the reversing levers and allows the scan contact pecker to rise one step, on its second traverse the pecker rises totaly opening the scan contacts.Why 4 scans? a selection made down stream may be chosen first and a new selection upsream may be then chosen so this aviods missed selections.Taylorraymond (talk) 23:53, 19 February 2009 (UTC)84.13.117.165 (talk) 00:06, 20 February 2009 (UTC)