Archived posting to the Leica Users Group, 1999/08/18
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]Hi All I've got a problem with an R4 motor drive and was hoping someone could help. Years ago while experimenting I tried to connect a power source to the accessory jack and blew the thing. It only works on single or 4 fps modes and the double exposure beeper stays on all the time. as a quick fix I disconnected the Piezo beeper back then but now I'de like to get the thing working for real. Inside I noticed 2 miniature surface mounted 14 pin DIPS labeled 4011BT and 4093BT. After some searching I managed to trace these to Philips. Both are quad double input nands with the 4093 having a shmidtt trigger built in. Since all the diodes and passive components test out ok I assume that one or both of these chips are responsible. So here's my question. Does anyone know which one of these would cause the problem? Also, anybody got some for sale? Finally, In case the repair fails Dioes anybody have a really beat up but electronically ok R4 drive for sale? Please let me know Best Regards Javier