Hi!
My analog board is having dificulties reaching the 5V DC output. At the maximum the potentiometer only gives ~4.90V Dc and never triggers the crowbar circuit.
The Logic Board has 4MB RAM upgrade and boots up altough the under voltage at 5V.
On the Macintosh Repair and Upgrade Secrets book it says that on international analog boards this issue is probably due to malfunctioning CR15, CR17 and CR 18 Zener Diodes.
It also says that all these three zener diodes are 6.2V 0.5 W generic part number 1N5234B.
When I desoldered my analog board CR15, CR17 and CR18, I was surprised to find that CR15 and CR17 are Motorola 1N4574-910 6.4V 0.5W zener diodes and CR18 is Motorola 1N5232B-917 5.6V 0.5W Zener Diode.
Can I replace all these tree diodes by the 1N5234B 6.2V 0.5W Zener Diode like the book says? Or I should look for equal ones to the originals?
Thanks!
My analog board is having dificulties reaching the 5V DC output. At the maximum the potentiometer only gives ~4.90V Dc and never triggers the crowbar circuit.
The Logic Board has 4MB RAM upgrade and boots up altough the under voltage at 5V.
On the Macintosh Repair and Upgrade Secrets book it says that on international analog boards this issue is probably due to malfunctioning CR15, CR17 and CR 18 Zener Diodes.
It also says that all these three zener diodes are 6.2V 0.5 W generic part number 1N5234B.
When I desoldered my analog board CR15, CR17 and CR18, I was surprised to find that CR15 and CR17 are Motorola 1N4574-910 6.4V 0.5W zener diodes and CR18 is Motorola 1N5232B-917 5.6V 0.5W Zener Diode.
Can I replace all these tree diodes by the 1N5234B 6.2V 0.5W Zener Diode like the book says? Or I should look for equal ones to the originals?
Thanks!
