E-mu Emulator Sampler User Forum for the EIII EII EI and EIII XP - EII+ HD with a Dead FDD and dead HDD

Welcome, Guest. Please login or register.
Did you miss your activation email?
August 20, 2017, 09:36:36 PM
Home Help Search Login Register
News: Want to register? Then please don't use a Hotmail, Yahoo or Gmail address. They'll block the activation email.
Still having problems activating your account? Send an email to: EIII @ telenet.be

+  E-mu Emulator Sampler User Forum for the EIII EII EI and EIII XP
|-+  General Category
| |-+  EII Technical Issues / Tips
| | |-+  EII+ HD with a Dead FDD and dead HDD
« previous next »
Pages: 1 [2] Print
Author Topic: EII+ HD with a Dead FDD and dead HDD  (Read 261 times)
alka
Full Member
***
Offline Offline

Posts: 47


WWW
« Reply #15 on: August 14, 2017, 07:09:26 AM »

Is it freezing at Boot in Progress? If so it might be a Z80 issue... have you tried swapping the Main and Scanner Z80A CPUs?
Logged

alka
Full Member
***
Offline Offline

Posts: 47


WWW
« Reply #16 on: August 14, 2017, 11:01:54 AM »

I would also check your PSU molex soldering and harness connections and also check/swap the first of the bottow rows of 4164 DRAM chips.... Here is a comment from Rob on an old Yahoo group post that was helpful to me...

"You can diagnose the failure points as follows:

If the LCD says Boot in Progress the main boot ROM is ok.
If the drive clicks 3 or more times and the EII stalls with Boot in Progress
it is RAM failure or RAM access failure - provided the drive is ok!
If the drive does not click at all and the EII stalls with Boot in Progress
its a main CPU failure.
If the drive clicks 3 times and the LCD is blank and random LED's light its
a Scanner ROM failure.
An Insert Diskette message means the EII cannot see a valid diskette in a
drive - bad media or drive or cable or controller chip
A floppy drive out of alignment or with dirty heads can cause OS loading
failure (Boot in Progeres stall)
A failed floppy drive controller chip will cause OS load failure.
Failed RAM will cause the OS to crash mid session too.

The EII scanning and main CPU's both have local SRAM as well as the main
DRAM. The main DRAM gets used for the OS and samples.

It is important that the PSU has been checked first before starting to
replace components and that you leave the EII to settle for a minute or two
between power on attempts. The Memory Test diskette is really handy for
sorting this type of problem out, but we don't have a copy. The debug ROM we
do have, but you need a RS232 terminal to use it!!

I suggest the following...
1) Check the PSU rails are on spec.
2) Recheck all SRAM, DRAM and ROM is seated.
3) Clean the diskette heads.
4) Check with the list above and see what problems you have still.
5) Check memory by swapping the SRAM chips around and the DRAM chips around.
6) Try a new boot and scanner ROM."
Logged

Pages: 1 [2] Print 
« previous next »
Jump to:  


Login with username, password and session length

E-mu Emulator Sampler User Forum for the EIII EII EI and EIII XP - EII+ HD with a Dead FDD and dead HDD

SEO light theme by © Mustang forums. Powered by SMF 1.1.21 | SMF © 2015, Simple Machines