Repair PET2001 AKA CMB 3032 - Revision history

Mahjongg at 16:04, 12 April 2022

2022-04-12T16:04:29Z

← Older revision		Revision as of 16:04, 12 April 2022
Line 3:		Line 3:
	\|Picture=CBM2032 running Tetris.jpg		\|Picture=CBM2032 running Tetris.jpg
	\|Omschrijving=Een poging tot reparatie van een echte klassieker, de CBM 3032 uit 1977		\|Omschrijving=Een poging tot reparatie van een echte klassieker, de CBM 3032 uit 1977
	\|Status=In Completed		\|Status=Completed
	\|Contact=Mahjongg		\|Contact=Mahjongg
	}}		}}

Mahjongg: status = completed

2022-04-12T16:04:02Z

status = completed

← Older revision		Revision as of 16:04, 12 April 2022
Line 3:		Line 3:
	\|Picture=CBM2032 running Tetris.jpg		\|Picture=CBM2032 running Tetris.jpg
	\|Omschrijving=Een poging tot reparatie van een echte klassieker, de CBM 3032 uit 1977		\|Omschrijving=Een poging tot reparatie van een echte klassieker, de CBM 3032 uit 1977
	\|Status=In ~~progress~~		\|Status=In Completed
	\|Contact=Mahjongg		\|Contact=Mahjongg
	}}		}}

Mahjongg: /* End of 2019, took the PET and floppy drives home */

2022-02-08T19:44:34Z

End of 2019, took the PET and floppy drives home

← Older revision		Revision as of 19:44, 8 February 2022
Line 118:		Line 118:
	== End of 2019, took the PET and floppy drives home ==		== End of 2019, took the PET and floppy drives home ==
	Both my PETS, a CBM4032, and a CBM8016 , and the dual drive unit I have now at home, but I never replaced the blown mains filter, only bypassed it. I also never got the floppy drives to work.		Both my PETS, a CBM4032, and a CBM8016 , and the dual drive unit I have now at home, but I never replaced the blown mains filter, only bypassed it. I also never got the floppy drives to work.

			Just a few months later the corona crisis started , and it still continues now (in February 2022, and RevSpace is still mainly closed. I have not much energy now to anyway.

Mahjongg: /* Tuesday January 2, 2018 we have let the magic smoke out from the floppy unit */

2022-02-08T19:42:13Z

Tuesday January 2, 2018 we have let the magic smoke out from the floppy unit

← Older revision		Revision as of 19:42, 8 February 2022
Line 115:		Line 115:
	I have looked at a replacement filter, but nothing like it (small cylinder with wires protruding from it) is made these days, they are either embedded in a schuko power entry, or large block like modules.		I have looked at a replacement filter, but nothing like it (small cylinder with wires protruding from it) is made these days, they are either embedded in a schuko power entry, or large block like modules.
	I think if I want to replace it I have to make one myself, from a couple of 500V 470pF caps, and a common mode choke.		I think if I want to replace it I have to make one myself, from a couple of 500V 470pF caps, and a common mode choke.

			== End of 2019, took the PET and floppy drives home ==
			Both my PETS, a CBM4032, and a CBM8016 , and the dual drive unit I have now at home, but I never replaced the blown mains filter, only bypassed it. I also never got the floppy drives to work.

Mahjongg: /* Tuesday January 2, 2018 we have let the magic smoke out from the floppy unit */

2018-03-06T14:35:33Z

Tuesday January 2, 2018 we have let the magic smoke out from the floppy unit

← Older revision		Revision as of 14:35, 6 March 2018
Line 113:		Line 113:
	== Tuesday January 2, 2018 we have let the magic smoke out from the floppy unit ==		== Tuesday January 2, 2018 we have let the magic smoke out from the floppy unit ==
	Not as serious perhaps as it sounds, but after a few hours of being turned on suddenly there was a bang, and smoke came out of the floppy unit. After fearing the worst, we concluded that it was just the mains filter that had given up the ghost. Probably just because it was so ancient.		Not as serious perhaps as it sounds, but after a few hours of being turned on suddenly there was a bang, and smoke came out of the floppy unit. After fearing the worst, we concluded that it was just the mains filter that had given up the ghost. Probably just because it was so ancient.
	I have looked at a replacement filter, but nothing like it (small cylinder with wires protruding from it) is made these days, ~~their~~ are either embedded in a schuko power entry, or large block like modules.		I have looked at a replacement filter, but nothing like it (small cylinder with wires protruding from it) is made these days, they are either embedded in a schuko power entry, or large block like modules.
	I think if I want to replace it I have to make one myself, from a couple of 500V 470pF caps, and a common mode choke.		I think if I want to replace it I have to make one myself, from a couple of 500V 470pF caps, and a common mode choke.

Mahjongg: /* Tuesday January 2, 2018 we have let the magic smoke out */

2018-02-26T17:23:24Z

Tuesday January 2, 2018 we have let the magic smoke out

← Older revision		Revision as of 17:23, 26 February 2018
Line 111:		Line 111:
	The command DCLEAR 0,0 should do so (according the commodore 1541 manual, which I presume is still valid for the 8050)		The command DCLEAR 0,0 should do so (according the commodore 1541 manual, which I presume is still valid for the 8050)

	== Tuesday January 2, 2018 we have let the magic smoke out ==		== Tuesday January 2, 2018 we have let the magic smoke out from the floppy unit ==
	Not as serious perhaps as it sounds, but after a few hours of being turned on suddenly there was a bang, and smoke came out of the floppy unit. After fearing the worst, we concluded that it was just the mains filter that had given up the ghost. Probably just because it was so ancient.		Not as serious perhaps as it sounds, but after a few hours of being turned on suddenly there was a bang, and smoke came out of the floppy unit. After fearing the worst, we concluded that it was just the mains filter that had given up the ghost. Probably just because it was so ancient.
	I have looked at a replacement filter, but nothing like it (small cylinder with wires protruding from it) is made these days, their are either embedded in a schuko power entry, or large block like modules.		I have looked at a replacement filter, but nothing like it (small cylinder with wires protruding from it) is made these days, their are either embedded in a schuko power entry, or large block like modules.
	I think if I want to replace it I have to make one myself, from a couple of 500V 470pF caps, and a common mode choke.		I think if I want to replace it I have to make one myself, from a couple of 500V 470pF caps, and a common mode choke.

Mahjongg: /* Tuesday January 2, 2018 we have let the magic smoke out */

2018-02-26T17:19:50Z

Tuesday January 2, 2018 we have let the magic smoke out

← Older revision		Revision as of 17:19, 26 February 2018
Line 113:		Line 113:
	== Tuesday January 2, 2018 we have let the magic smoke out ==		== Tuesday January 2, 2018 we have let the magic smoke out ==
	Not as serious perhaps as it sounds, but after a few hours of being turned on suddenly there was a bang, and smoke came out of the floppy unit. After fearing the worst, we concluded that it was just the mains filter that had given up the ghost. Probably just because it was so ancient.		Not as serious perhaps as it sounds, but after a few hours of being turned on suddenly there was a bang, and smoke came out of the floppy unit. After fearing the worst, we concluded that it was just the mains filter that had given up the ghost. Probably just because it was so ancient.
	I have looked at a replacement filter, but nothing like it (small cylinder with wires protruding from it) is made these days, their are either embedded in a ~~shuko~~ power entry, or large block like modules.		I have looked at a replacement filter, but nothing like it (small cylinder with wires protruding from it) is made these days, their are either embedded in a schuko power entry, or large block like modules.
	I think if I want to replace it I have to make one myself, from a couple of 500V 470pF caps, and a common mode choke.		I think if I want to replace it I have to make one myself, from a couple of 500V 470pF caps, and a common mode choke.

Mahjongg: /* Tuesday January 2, 2018 we have let the magic smoke out */

2018-02-26T17:17:23Z

Tuesday January 2, 2018 we have let the magic smoke out

← Older revision		Revision as of 17:17, 26 February 2018
Line 113:		Line 113:
	== Tuesday January 2, 2018 we have let the magic smoke out ==		== Tuesday January 2, 2018 we have let the magic smoke out ==
	Not as serious perhaps as it sounds, but after a few hours of being turned on suddenly there was a bang, and smoke came out of the floppy unit. After fearing the worst, we concluded that it was just the mains filter that had given up the ghost. Probably just because it was so ancient.		Not as serious perhaps as it sounds, but after a few hours of being turned on suddenly there was a bang, and smoke came out of the floppy unit. After fearing the worst, we concluded that it was just the mains filter that had given up the ghost. Probably just because it was so ancient.
			I have looked at a replacement filter, but nothing like it (small cylinder with wires protruding from it) is made these days, their are either embedded in a shuko power entry, or large block like modules.
			I think if I want to replace it I have to make one myself, from a couple of 500V 470pF caps, and a common mode choke.

Mahjongg: /* 29 July Repair completed, keyboard works 100% */

2018-02-26T17:11:39Z

29 July Repair completed, keyboard works 100%

← Older revision		Revision as of 17:11, 26 February 2018
Line 59:		Line 59:

	== 29 July Repair completed, keyboard works 100% ==		== 29 July Repair completed, keyboard works 100% ==
	After changing the 10K pullups to 47K, most keys still would not work, and I came convinced that not only were the key-pad fingers worn, but somehow they were also contaminated with something, perhaps the original user was a heavy smoker, or some coke was dripped into the keyboard in the ~~pas~~. I decided to re-tin the contact fingers of the spacebar (which already worked) and the enter key which did not at all work, even with the weaker pullups, and see what the result was. It was good, both space and enter now worked reliably. So I started on the enormous job of very carefully re-tinning the tiny traces that formed interlocking fingers under each of the eighty or so carbon pads. With the help of some liquid solder flux, a soldering iron set to the exact temperature at which the solder "took" while the glue to which the pads were bonded to the PCB did not give way, and some solder wick to spread out the solder evenly. It was a difficult job, but in the end it all worked out, and after cleaning the PCB thoroughly with flux remover and isopropanol all keys worked again. I temporary replaced the lost spring with a piece of rubber tube.		After changing the 10K pullups to 47K, most keys still would not work, and I came convinced that not only were the key-pad fingers worn, but somehow they were also contaminated with something, perhaps the original user was a heavy smoker, or some coke was dripped into the keyboard in the past. I decided to re-tin the contact fingers of the spacebar (which already worked) and the enter key which did not at all work, even with the weaker pullups, and see what the result was. It was good, both space and enter now worked reliably. So I started on the enormous job of very carefully re-tinning the tiny traces that formed interlocking fingers under each of the eighty or so carbon pads. With the help of some liquid solder flux, a soldering iron set to the exact temperature at which the solder "took" while the glue to which the pads were bonded to the PCB did not give way, and some solder wick to spread out the solder evenly. It was a difficult job, but in the end it all worked out, and after cleaning the PCB thoroughly with flux remover and isopropanol all keys worked again. I temporary replaced the lost spring with a piece of rubber tube.

	Now I can start using the PET!		Now I can start using the PET!

Mahjongg: /* December 12m 2017 replaced power switch */

2018-01-08T10:42:08Z

December 12m 2017 replaced power switch

← Older revision		Revision as of 10:42, 8 January 2018
Line 106:		Line 106:
	Bought a new switch, and installed it, after blowing a few fuses, because I connected to the wrong primary winding connections (that what you get if you rely only on memory, and it lasts two weeks before you can continue) it worked. The blinking leds on the drive indicated the two (!) 6502 microprocessors in the CBM8050 were still working.		Bought a new switch, and installed it, after blowing a few fuses, because I connected to the wrong primary winding connections (that what you get if you rely only on memory, and it lasts two weeks before you can continue) it worked. The blinking leds on the drive indicated the two (!) 6502 microprocessors in the CBM8050 were still working.
	So I connected it up to the PET, and tried if I could somehow prove it was working, without having a floppy.		So I connected it up to the PET, and tried if I could somehow prove it was working, without having a floppy.
	So I tried commands like LOAD"$",8,1 but got no ~~reation~~, also not with the more correct LOAD ¨$0",8.		So I tried commands like LOAD"$",8,1 but got no reaction, also not with the more correct LOAD ¨$0",8.
	I did notice that turning the PET on and off seem to reset the CMB 8050,		I did notice that turning the PET on and off seem to reset the CMB 8050,
	have to organize a floppy (which I did in the mean time) and try to format it.		have to organize a floppy (which I did in the mean time) and try to format it.
	The command DCLEAR 0,0 should do so (according the commodore 1541 manual, which I presume is still valid for the 8050)		The command DCLEAR 0,0 should do so (according the commodore 1541 manual, which I presume is still valid for the 8050)

			== Tuesday January 2, 2018 we have let the magic smoke out ==
			Not as serious perhaps as it sounds, but after a few hours of being turned on suddenly there was a bang, and smoke came out of the floppy unit. After fearing the worst, we concluded that it was just the mains filter that had given up the ghost. Probably just because it was so ancient.