Mac Plus "happy mac" freeze during bootup

[CharlieFrown]

Hi, 

having problem with my Macintosh Plus, it never manages to boot operating system, instead it freezes after a while (like 5 seconds) of reading data. Doesnt matter if I try to boot it from floppy (100% bootable floppy inserted in working internal and external drives) or external hard disk with bootable System 6 (tried with other Mac) it's always the same, freezes with happy Mac icon (as seen on screen). 

IWM, Bourns Filter? What should be tested first?

 

[CharlieFrown]

ok not really freezing... as it stops booting from hard disk I can insert floppy and it's trying to read it, but no success. 

Another thing is it correctly ejects non system floppy and I can manually eject any floppy with mouse button pressed, so I guess IWM chip is ok?

 

[CharlieFrown]

Problem solved. Removed R8 resistor "256k bit memory" and used 4 x 1 MB memory chips (instead of 256 kB ones). Works smoothly!