Apple Macintosh Classic analog board

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Analog Board

Repair notes

I bought this compact Macintosh in September 2019 – it’s the second Classic (I) I own.

On the surface everything was looking great, no battery leak, no dust bunnies, no previous “hacks” and no bulging capacitors.

At first boot, there was no response.

Looking at the analogue board, the glass fuse was blown.

I bought new fuses and replaced accordingly.

Upon boot, there was a flash and the new fuse was blown.

I’ve seen this referenced here, and here.

Capacitors

Position(s) Description Capacitance Voltage Lead Spacing Diameter Length
CP2 Aluminium Electrolytic Capacitors – Radial 1000 µF 35 V 5 mm 12 mm 32 mm
CP3, CP12 Aluminium Electrolytic Capacitors – Radial 1000 µF 16 V 5 mm 10 mm 31 mm
CP4, CP9, CP10 Aluminium Electrolytic Capacitors – Radial 470 µF 25 V 5 mm 10 mm 16 mm
CP6, CP36 Aluminium Electrolytic Capacitors – Radial 2200 µF 10 V 5 mm 12 mm 25 mm
CP7 Aluminium Electrolytic Capacitors – Radial 1000 µF 10 V 5 mm 10 mm 22 mm
CP8 Aluminium Electrolytic Capacitors – Radial 2200 µF 16 V 5 mm 12 mm 32 mm

Glass Fuse

Position Description Mounting Style Current Rating Voltage Diameter Length
FP1 Cartridge Glass Fuse – Fast Acting Holder / Clip 2.5 A 250 VAC 5 mm 20 mm

MOSFET

Position Description Mounting Style Reference (original)
QP2 MOSFET Through Hole IRFBC40 9052 5T 9R

Optocoupler

Position Description Mounting Style Reference (original)
QP1 Transistor Output Optocouplers Through Hole PHILIPS CNY17G-3 m9046

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