:help:
I was transferring some data to/from my 1541, when I inadvertantly connected the xe-1541 cable while the drive was still on... it started rotating, and now it doesn't respond anymore to commands... not even from the c64... It just listen to "cbmctrl reset" from the dos window... what can I do??? I fear I have broken it.... ;( cry cry
Can anybody suggest anything to do, or what to look at?
Fuses? what else?
Thanks in advance
Sam
PS
With 'urgent' I mean, I'm leaving in some days, so if you have any idea I will try to fix it while I'm here... then I'll have to try again in two months...
---------- Post added at 14:07 ---------- Previous post was at 13:53 ----------
From R. Carlsen repair guide:
http://personalpages.tds.net/~rcarlsen/cbm/1541chip.txt
1541 CHIPS VS SYMPTOMS
PCB# 1540050 (early version) with ALPS drive mechanism (1982)
UC3 6522 VIA (SERIAL INTERFACE)
Drive powers up and resets normally. When LOAD attempted, screen
indicates "SEARCHING FOR ...", but no motors run and red LED does not
light.
What does that mean? Burnt out chip? Which one?
It all happened while the serial cable was connected so maybe this is the culprit, and the description of the symptoms is exact...
Can it be repaired?
---------- Post added at 14:14 ---------- Previous post was at 14:07 ----------
Other possible cause for a different version of the drive (I don't know where to check which one is mine... it's the first 1541 model without the knob, it has a thing to push down after the floppy is inside)...
1541 CHIPS VS SYMPTOMS PCB# 251830 or 251777 with Newtronics drive
mechanism (1984)
UB1 7406 (M53206P or 7707) LOGIC
Partial failure common cause of "SEARCHING FOR" (check also UC3)
and "DEVICE NOT PRESENT" errors. Total failure: drive powers up OK,
but does not respond to computer... no reset or disk access.
---------- Post added at 14:55 ---------- Previous post was at 14:14 ----------
There are two 6522 chips on the drive. So I swapped them and I obtained the correct symptoms according to the repair guide (uc4 failure), which are:
- red light on
- drive spinning (only if I remove the chip, anyway...)
If I just keep the supposedly broken chip in, the light stays on but it doesn't rotate.
If you agree with me that the 6522 and nothing else is the culprit, I'll start searching for a replacement one.
Let me know!
Sam
I was transferring some data to/from my 1541, when I inadvertantly connected the xe-1541 cable while the drive was still on... it started rotating, and now it doesn't respond anymore to commands... not even from the c64... It just listen to "cbmctrl reset" from the dos window... what can I do??? I fear I have broken it.... ;( cry cry
Can anybody suggest anything to do, or what to look at?
Fuses? what else?
Thanks in advance
Sam
PS
With 'urgent' I mean, I'm leaving in some days, so if you have any idea I will try to fix it while I'm here... then I'll have to try again in two months...
---------- Post added at 14:07 ---------- Previous post was at 13:53 ----------
From R. Carlsen repair guide:
http://personalpages.tds.net/~rcarlsen/cbm/1541chip.txt
1541 CHIPS VS SYMPTOMS
PCB# 1540050 (early version) with ALPS drive mechanism (1982)
UC3 6522 VIA (SERIAL INTERFACE)
Drive powers up and resets normally. When LOAD attempted, screen
indicates "SEARCHING FOR ...", but no motors run and red LED does not
light.
What does that mean? Burnt out chip? Which one?
It all happened while the serial cable was connected so maybe this is the culprit, and the description of the symptoms is exact...
Can it be repaired?
---------- Post added at 14:14 ---------- Previous post was at 14:07 ----------
Other possible cause for a different version of the drive (I don't know where to check which one is mine... it's the first 1541 model without the knob, it has a thing to push down after the floppy is inside)...
1541 CHIPS VS SYMPTOMS PCB# 251830 or 251777 with Newtronics drive
mechanism (1984)
UB1 7406 (M53206P or 7707) LOGIC
Partial failure common cause of "SEARCHING FOR" (check also UC3)
and "DEVICE NOT PRESENT" errors. Total failure: drive powers up OK,
but does not respond to computer... no reset or disk access.
---------- Post added at 14:55 ---------- Previous post was at 14:14 ----------
There are two 6522 chips on the drive. So I swapped them and I obtained the correct symptoms according to the repair guide (uc4 failure), which are:
- red light on
- drive spinning (only if I remove the chip, anyway...)
If I just keep the supposedly broken chip in, the light stays on but it doesn't rotate.
If you agree with me that the 6522 and nothing else is the culprit, I'll start searching for a replacement one.
Let me know!
Sam
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