Hello everyone,
I recently acquired a Macintosh Plus (PAL) on eBay. The seller mentioned that the computer has a faulty ROM and only has 512K of RAM instead of the original 1MB.
When it arrived, I decided to open the Macintosh Plus after watching several videos about common issues, such as cracked Rifa caps and cracked solder joints around the connectors. I addressed these problems by replacing all the capacitors, including the Rifa caps on the power board and logic board, and reflowing any questionable connections.
I posted a few photos on Facebook, and someone pointed out that my Plus has a 400K drive instead of an 800K drive. A few speculated that this computer might have been upgraded by Apple, with the original owner opting to leave the drive, but we are not entirely sure.
Now, back to the problem. I have tried to power on the Macintosh after the recap, but I am not getting any sound or picture from the CRT. With the help of some fantastic members from the RMC Discord, they suggested that I check the voltages on the power supply. I verified that the large capacitors are receiving around 300 volts, and the power switch is both receiving power and showing continuity.
All the capacitors I've used are high-quality ones from Nichicon and Rubycon, and I've double-checked my work to ensure that they are all properly installed and soldered.
Any suggestions would be greatly appreciated. Thank you!
Jake
I recently acquired a Macintosh Plus (PAL) on eBay. The seller mentioned that the computer has a faulty ROM and only has 512K of RAM instead of the original 1MB.
When it arrived, I decided to open the Macintosh Plus after watching several videos about common issues, such as cracked Rifa caps and cracked solder joints around the connectors. I addressed these problems by replacing all the capacitors, including the Rifa caps on the power board and logic board, and reflowing any questionable connections.
I posted a few photos on Facebook, and someone pointed out that my Plus has a 400K drive instead of an 800K drive. A few speculated that this computer might have been upgraded by Apple, with the original owner opting to leave the drive, but we are not entirely sure.
Now, back to the problem. I have tried to power on the Macintosh after the recap, but I am not getting any sound or picture from the CRT. With the help of some fantastic members from the RMC Discord, they suggested that I check the voltages on the power supply. I verified that the large capacitors are receiving around 300 volts, and the power switch is both receiving power and showing continuity.
All the capacitors I've used are high-quality ones from Nichicon and Rubycon, and I've double-checked my work to ensure that they are all properly installed and soldered.
Any suggestions would be greatly appreciated. Thank you!
Jake