Macintosh Classic II

For more information, see this article's corresponding Wikipedia page: Macintosh Classic II.

Macintosh Classic II

Preliminary Information
Release Year	1991
Leak Risk	High
Batteries	Removable
Mounting Technology	Through Hole, SMD, Sockets
Capacitor Types	Aluminum Electrolytic
Destructive Entry	No

The Apple Mac Classic II was towards the end of the line for the Compact Macs.

Known Issues

Vertical bars on power on

Cause

• Leaking capacitors on logic board

• 
  Visible leakage around the base of C4 which had previously been cleaned and continued to leak

Solution

• Recap logic board

Disassembly Notes

The screws that are used to hold the case together are Torx T15. You will need a driver with a long shaft (about 6" - 150mm) to reach the two screws under the handle. These can be found on Amazon, eBay, and sometimes in hardware/automotive stores. This tool is also sometimes known as a "Mac Cracker". The same tool is also used for the other compact Macs.

A 1/4" T15 screwdriver-bit with a slot ground in its back surface (for a long flat head screwdriver) works nicely for accessing the under-handle screws. Most standard (1/4") bitdrivers have too thick a collar to reach the handle screws. The tool shaft should be no bigger in diameter than 8mm (~5/16").

T15 screws can be turned, in an emergency, with a flat head screwdriver with a blade width of about 3mm (1/8").

Sometimes the case is difficult to open the first time as it is held together with a tight friction fit. You can usually use a wide flat object to gently pry the case open, being careful not to leave marks in the plastic.

Replacement Parts

Analog Board

Classic II analog board 820-0525-A / 630-0420 240v

Observed from 820-0525-A / 630-0420 240v (European version)

• CP19, CP38 RIFA can be cracked

• TDA 4605 if not power after recaped all capacitors

Electrolytic Capacitors 820-0525-A / 630-0420 240v

RefDes	Qty	Capacitance	Voltage	Diameter/size	Height	Lead Spacing	Board Zone	Note
CP1	1	220 µF	250 V	22 mm	51 mm	10 mm	High Voltage	no need to replace
CP2	1	470 µF	50 V	12,5 mm	25 mm	5 mm	Power Supply
CP4, CF1	2	47 µF	25 V	5 mm	11 mm	2mm (board has 5mm)	Power Supply
CP5, CP34, CP37, CL3	4	1 µF	50 V	5 mm	11 mm	2mm (board has 5mm)	Power Supply
CP6, CP36	2	2200 µF	10 V	12,5 mm	25 mm	5 mm	Power Supply
CP8	1	2200 µF	16 V	12,5 mm	31,5 mm	5 mm	Power Supply
CP12	1	1000 µF	16 V	10 mm	31,5 mm	5 mm	Power Supply
CP7	1	1000 µF	10 V	10 mm	20 mm	5 mm	Power Supply
CP9, CP10, CF4	3	470 µF	25 V	10 mm	15 mm	5 mm	Power Supply
CP11	1	220 µF	50 V	10 mm	25 mm	5 mm	THT Flyback
CP3	1	10 µF	25 V	5 mm	11 mm	2mm (board has 5mm)	THT Flyback
CL1	1	1000 µF	25 V	12,5 mm	20 mm	5mm	THT Flyback
CL2	1	4,7 µF	250 V	10 mm	11 mm	5mm	THT Flyback
CL11	1	47 µF	16 V	5 mm	11 mm	2mm (board has 5mm)	Video Circuit
CF2	1	220 µF	16 V	8 mm	11 mm	5mm	Video Circuit
CF3	1	1000 µF	16 V	10 mm	20 mm	5mm	Video Circuit
CV2	1	470 µF	10V	8 mm	11 mm	5mm	Video Circuit

Difference between Analog Board Mac Classic 1 820-0395-C / 630-0420 240v and Mac Classic 2 820-0525-A / 630-0420 240v

• additional CP13 same as CP1 in 400 V instead 250 V
• CP2 1000 µF 35 V instead 470 µF 50 V
• CL1 10uf 50v instead 1000 µF 25 V
• CP11 25v instead 50v
• CP31 instead CV2
• CP35 instead CL11

Logic Board

Alternative Partial Solid Capacitors

RefDes	Qty	Capacitance	Voltage	Compatible Part Number	Order Links
C9, C15	2	1 µF	50 V	293D105X9050B2TE3 / TAJB105K050RNJ	DigiKey Mouser LCSC
C3, C4, C13	3	47 µF	16 V	UCJ1V470MCL1GS	DigiKeyMouser LCSC
C5, C6, C7, C8, C10, C11, C14, C12	8	10 µF	16 V	TAJB106K016TNJ	DigiKey Mouser LCSC

If parts are not available or different selection is preferred, you can use the values in the Original Parts section to perform a parametric search.

Additional Images

• 
  Top side of motherboard (Rev B)
• 
  Bottom side of motherboard (Rev B)

Related Links

• Video replacing original capacitors with most solid replacements
• Apple Macintosh Classic II Specs