128 Dead, power but no screens in 128 80, 40, or c64 mode.

[dabone]

Ok, I'm an idiot. I was playing around with a user port interface I built and partialy unplugged it while my 128 was on.
The machine did a hard lock, and when I tried rebooting, the machine is dead.

Any suggestions on what to try or check?

I've got access to a 64 for parts, but not another 128.


Thanks,
Mark
aka
dabone

[megabit]

Check the voltages at the power supply.

Dan...

[dabone]

Ok, I went and borrowed another 128 from a friend, and yes it was just the power supply.

Pheew.... dodged a bullet with that one..

Now off to look for a guide on the 128 power supply...

Later,
dabone

[dabone]

Ok, checked around, checked the fuse, and sure enough the 9vac fuse was popped.
Replaced the fuse and all is well.

When I was troubleshooting the 128 I checked to make sure I had +5v but never bothered to check for 9vac.
I was assuming that like a 64 the 128 didn't need 9vac to boot.

Well look what assuming got me. (Had to drive all the way across town to get another 128).
The z80 requires the 9vac to bootup, and if the z80 ain't happy, ain't nobody happy.




So that's another lesson learned.... always check all your voltages, don't do just do a half assed job..

Later,
dabone

[RobertB]

     Whew!  That was a close one. 

                  Truly,
                  Robert Bernardo
                  Fresno Commodore User Group
                  http://videocam.net.au/fcug
                  Notacon 6 / Blockparty 3 on April 16-19
                  http://www.notacon.org , http://www.demoparty.us

[Andrew Wiskow]

Ok, checked around, checked the fuse, and sure enough the 9vac fuse was popped.
Replaced the fuse and all is well.

Wow... You figured that out quickly! 

I was going to tell you it was probably the fuse in the power supply because a similar thing happened to me a couple years ago.  I'm glad to hear you got it fixed. 

[dabone]

What can I saw, I'm impatient...

(I just took apart and cleaned the 128 I borrowed, including disassembling the keyboard and washing the keys...
Now I don't feel dirty just typing on that one.. I'll return it monday bright and shiny..)



Now if I could figure out why commodore bbs's don't work with a wiport but some pc ones do...
(I remember reading somewhere about raw vs telnet for transport..)


Later,
dabone

[Andrew Wiskow]

(I just took apart and cleaned the 128 I borrowed, including disassembling the keyboard and washing the keys...
Now I don't feel dirty just typing on that one.. I'll return it monday bright and shiny..)

I hope the owner appreciates the time and effort you put into it.

Now if I could figure out why commodore bbs's don't work with a wiport but some pc ones do...
(I remember reading somewhere about raw vs telenet for transport..)

Commodore BBSs don't actually transmit data via the Telnet protocol.  They're just usually set up on the traditional Telnet port (23).  Data is transmitted via raw ASCII (or PETSCII, as the case may be).  You have to remember that at far as the Commodore running the BBS is concerned, it's getting calls via a regular modem and transmitting all data over a phone line.  It's just being "tricked" into doing it over the Internet. 

[caren103]

Ok, checked around, checked the fuse, and sure enough the 9vac fuse was popped.
Replaced the fuse and all is well.

When I was troubleshooting the 128 I checked to make sure I had +5v but never bothered to check for 9vac.
I was assuming that like a 64 the 128 didn't need 9vac to boot.

Well look what assuming got me. (Had to drive all the way across town to get another 128).
The z80 requires the 9vac to bootup, and if the z80 ain't happy, ain't nobody happy.




So that's another lesson learned.... always check all your voltages, don't do just do a half assed job..

Later,
dabone

Well, I had to check the fuse then, as I extracted and inserted a cartridge without noticing the 128D was switchen on, although it was an already faulty 128D...

I didn't know a C128D could switch on, but still doesn't working due to have the PSU ( or its fuse ) damaged...