Quote from Commodore Tech Topics, Issue 22 (Oct. 88): 1541-II PCB-DRIVE ASSY REFERENCE. 1541-II PCB ASSEMBLY PN# 340503-01 HAS THREE (3) REVISION NUMBERS. 1) 340503-01 REV 4 BOARD: CN4 HAS ALL SEVEN (7) PINS. 2) 340503-01 REV 5 BOARD: PINS 1 & 2 OF CN4 ARE REMOVED, R41 IS REMOVED. 3) 340503-01 REV 6 BOARD: PINS 1 & 2 OF CN4 ARE REMOVED, R41 HAS BEEN RE-INSTALLED. 1541-II HAS THREE (3) DRIVE ASSEMBLIES. 1) 359901-01 NEWTRONICS D500 - USE ONLY REV 4 PCB. 2) 359902-01 CHINON FZ501 - USE REV 4, 5, OR 6 PCBS. 3) 359901-02 NEWTRONICS D500 TYPE R - USE REV 4, 5, OR 6 PCBS. <offtopic> Btw.. is there someone with a complete archive of Tech Topics? They often contain useful bits of information but people seem to rather collect and hide them away from the community. You'll find some (incomplete) scans on Google, but no one seems to have a complete archive online. :( </offtopic> Regards, Chris Am 08.02.2016 um 20:24 schrieb Christian Euler: > Hi, > > just checked my 1541-II. The PCB silk screen says: > > ASSY 340503, Rev 8 1988.6 > > Regards, > Chris > > Am 08.02.2016 um 17:24 schrieb Ville Laustela: >> >> I checked my two non-working units: >> >> 1) ASSY 340503, Rev 5 1987.11 >> 2) ASSY 340503, Rev A 1987.11 >> >> The Rev 5 board has chips with dates 39th/48th week 1987 while the Rev >> A board has 24/25th week 1988. >> >> — >> Ville >> >> >> >> >> >>> silverdr@wfmh.org.pl kirjoitti 8.2.2016 kello 16.22: >>> >>> Some time ago we discussed about the drive mechanisms that were >>> mounted inside 1541-IIs and concluded that at least three different >>> mechanisms were used by CBM, which also required two different >>> variants of the front bezel to be created. Now comes the question >>> about the controller's PCBs. I had a look at those I checked the >>> drive mechanisms back then and all of them seem to have ASSY No. >>> 340503 Rev.9. Do we know about other revisions/ASSYs? >>> >>> -- >>> SD! >>> >>> >>> Message was sent through the cbm-hackers mailing list >> >> >> Message was sent through the cbm-hackers mailing list >> > Message was sent through the cbm-hackers mailing list
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