Re: Mac Plus Repair - analog and logic board
I have a Mac Plus that I bought new that I am trying to get operational again. When it finally became unusable, the screen would go to a thin vertical line and sometimes it would work again if I tapped the case. This issue would happen right away upon turning the Plus on. I resoldered some of the joints (L2, C1, J1) on the analog board and it seems to be better, but there is no start-up bong when I turn on the machine. The screen appears normal with the flashing floppy icon. I haven't been able to do enough testing yet to see if the resoldering has fixed the issue after it has been warmed up for a while. What is the cause of no start-up bong? The flaky joints you particularly need to check are the ones associated with the 4-pin connector that goes between the analog board and the yoke around the crt's neck. Resolder (with fresh solder) the connections on the analog board. Then, undo the connector and inspect the pins in both halves. In some cases these get damaged from the heat produced by the flaky contact. Repair or replace as necessary. As to the no bong problem, double-check the speaker, the capacitor in series with it (you'll have to do a little tracing), and the connections associated with them. And as to your other question about the micro screen logic board, doublecheck your ram. Make sure that the ram is good, installed properly, and that the ram size resistor is configured correctly for whatever ram capacity you've got. For other details, there are some troubleshooting hints, along with a schematic of the Plus analog board here: http://home.earthlink.net/~gamba2/images/plus_analog.PDF --Cheers, Tom -- Prof. Thomas H. Lee Center for Integrated Systems, CIS-205 420 Via Palou Mall Stanford University Stanford, CA 94305-4070 http://www-smirc.stanford.edu 650-725-3709 voice, -3383 fax -- Compact Macs is sponsored by http://lowendmac.com/. Support Low End Mac http://lowendmac.com/lists/support.html Compact Macs list info: http://lowendmac.com/lists/compact.shtml -- AOL users, remove mailto:; Send list messages to: mailto:compact.macs@mail.maclaunch.com To unsubscribe, email: mailto:[EMAIL PROTECTED] For digest mode, email: mailto:[EMAIL PROTECTED] Subscription questions: mailto:[EMAIL PROTECTED] Archive:http://www.mail-archive.com/compact.macs%40mail.maclaunch.com/ --- iPod Accessories for Less at 1-800-iPOD.COM Fast Delivery, Low Price, Good Deal www.1800ipod.com ---
Re: Mac Plus Repair - analog and logic board
The flaky joints you particularly need to check are the ones associated with the 4-pin connector that goes between the analog board and the yoke around the crt's neck. I think I finally found the culprit to the flaky video. I checked the joints on J4 and two appeared to be suspect, so I re-soldered all the pins with fresh solder. The problem still occurred until I started pushing on the wires near the connector and saw it would make the screen come in and out, so I swapped the wire harness for the J4 connector and now I cannot make the video go out. The problem could have been a combination of flaky joints and pins on the wire harness. As to the no bong problem, double-check the speaker, the capacitor in series with it (you'll have to do a little tracing), and the connections associated with them. I sort of checked along this path but didn't see anything significant. I'll have to check this out more thoroughly. And as to your other question about the micro screen logic board, doublecheck your ram. Make sure that the ram is good, installed properly, and that the ram size resistor is configured correctly for whatever ram capacity you've got. This is absolutely correct. The spare board I got came configured for more than 1MB of RAM, but I been using 256KB SIMMs. After putting in 4MB, the board operates normally, though I noticed the time for the floppy icon to appear takes a bit longer...is this normal? Many thanks, tt -- Compact Macs is sponsored by http://lowendmac.com/. Support Low End Mac http://lowendmac.com/lists/support.html Compact Macs list info: http://lowendmac.com/lists/compact.shtml -- AOL users, remove mailto:; Send list messages to: mailto:compact.macs@mail.maclaunch.com To unsubscribe, email: mailto:[EMAIL PROTECTED] For digest mode, email: mailto:[EMAIL PROTECTED] Subscription questions: mailto:[EMAIL PROTECTED] Archive:http://www.mail-archive.com/compact.macs%40mail.maclaunch.com/ --- iPod Accessories for Less at 1-800-iPOD.COM Fast Delivery, Low Price, Good Deal www.1800ipod.com ---
Re: Mac Plus Repair - analog and logic board
On Thursday, December 29, 2005, at 03:27 PM, Thomas wrote: This is absolutely correct. The spare board I got came configured for more than 1MB of RAM, but I been using 256KB SIMMs. After putting in 4MB, the board operates normally, though I noticed the time for the floppy icon to appear takes a bit longer...is this normal? Completely 100% normal. The Mac is doing RAM tests in the period before showing you the floppy icon. More RAM = longer time to test it all. -Nat -- Compact Macs is sponsored by http://lowendmac.com/. Support Low End Mac http://lowendmac.com/lists/support.html Compact Macs list info: http://lowendmac.com/lists/compact.shtml -- AOL users, remove mailto:; Send list messages to: mailto:compact.macs@mail.maclaunch.com To unsubscribe, email: mailto:[EMAIL PROTECTED] For digest mode, email: mailto:[EMAIL PROTECTED] Subscription questions: mailto:[EMAIL PROTECTED] Archive:http://www.mail-archive.com/compact.macs%40mail.maclaunch.com/ --- iPod Accessories for Less at 1-800-iPOD.COM Fast Delivery, Low Price, Good Deal www.1800ipod.com ---
Re: Mac Plus Repair - analog and logic board
the floppy disk icon means you need to find or make a boot disk On 12/28/05, Thomas [EMAIL PROTECTED] wrote: I have a Mac Plus that I bought new that I am trying to get operational again. When it finally became unusable, the screen would go to a thin vertical line and sometimes it would work again if I tapped the case. This issue would happen right away upon turning the Plus on. I resoldered some of the joints (L2, C1, J1) on the analog board and it seems to be better, but there is no start-up bong when I turn on the machine. The screen appears normal with the flashing floppy icon. I haven't been able to do enough testing yet to see if the resoldering has fixed the issue after it has been warmed up for a while. What is the cause of no start-up bong? I also have a spare logic board that operates weird. At start-up, the screen is the size of a postage stamp, tightly surrounding a frozen floppy icon. The rest of the screen is dark. I haven't checked to see if it can boot, but I figure this is a significant failure. I have tested this logic board with a known good analog board and the board that I described above. Can this logic board be repaired? Thanks, tt -- Compact Macs is sponsored by http://lowendmac.com/. Support Low End Mac http://lowendmac.com/lists/support.html Compact Macs list info: http://lowendmac.com/lists/compact.shtml -- AOL users, remove mailto:; Send list messages to: mailto:compact.macs@mail.maclaunch.com To unsubscribe, email: mailto:[EMAIL PROTECTED] For digest mode, email: mailto:[EMAIL PROTECTED] Subscription questions: mailto:[EMAIL PROTECTED] Archive:http://www.mail-archive.com/compact.macs%40mail.maclaunch.com/ --- iPod Accessories for Less at 1-800-iPOD.COM Fast Delivery, Low Price, Good Deal www.1800ipod.com --- -- Compact Macs is sponsored by http://lowendmac.com/. Support Low End Mac http://lowendmac.com/lists/support.html Compact Macs list info: http://lowendmac.com/lists/compact.shtml -- AOL users, remove mailto:; Send list messages to: mailto:compact.macs@mail.maclaunch.com To unsubscribe, email: mailto:[EMAIL PROTECTED] For digest mode, email: mailto:[EMAIL PROTECTED] Subscription questions: mailto:[EMAIL PROTECTED] Archive:http://www.mail-archive.com/compact.macs%40mail.maclaunch.com/ --- iPod Accessories for Less at 1-800-iPOD.COM Fast Delivery, Low Price, Good Deal www.1800ipod.com ---
Re: Mac Plus Repair - analog and logic board
the floppy disk icon means you need to find or make a boot disk Booting up a system disk is not the issue...I've owned and used this machine for many years. I'm talking about physical problems with the machine's hardware. -- Compact Macs is sponsored by http://lowendmac.com/. Support Low End Mac http://lowendmac.com/lists/support.html Compact Macs list info: http://lowendmac.com/lists/compact.shtml -- AOL users, remove mailto:; Send list messages to: mailto:compact.macs@mail.maclaunch.com To unsubscribe, email: mailto:[EMAIL PROTECTED] For digest mode, email: mailto:[EMAIL PROTECTED] Subscription questions: mailto:[EMAIL PROTECTED] Archive:http://www.mail-archive.com/compact.macs%40mail.maclaunch.com/ --- iPod Accessories for Less at 1-800-iPOD.COM Fast Delivery, Low Price, Good Deal www.1800ipod.com ---
Re: Mac Plus Repair - analog and logic board
At 16:32 -0800 12/28/05, Thomas wrote: I have a Mac Plus that I bought new that I am trying to get operational again. When it finally became unusable, the screen would go to a thin vertical line and sometimes it would work again if I tapped the case. The analog board - vertical one - has large and small solder joints on it. Often the larger joints are not so good, probably because the soldering time and temperature were set for the small joints. Have a look with a magnifier and look for cracks in the solder. Watch the connectors to cables that go out to the magnetic deflection coils around the neck of the tube. The tapping you did often makes a temporary contact - for a while. -- -- The best programming tool is a soldering iron -- -- Compact Macs is sponsored by http://lowendmac.com/. Support Low End Mac http://lowendmac.com/lists/support.html Compact Macs list info: http://lowendmac.com/lists/compact.shtml -- AOL users, remove mailto:; Send list messages to: mailto:compact.macs@mail.maclaunch.com To unsubscribe, email: mailto:[EMAIL PROTECTED] For digest mode, email: mailto:[EMAIL PROTECTED] Subscription questions: mailto:[EMAIL PROTECTED] Archive:http://www.mail-archive.com/compact.macs%40mail.maclaunch.com/ --- iPod Accessories for Less at 1-800-iPOD.COM Fast Delivery, Low Price, Good Deal www.1800ipod.com ---
