Commodore Amiga 500+ that has seen better days (Recovery Components)

Components Recovered:

• All custom amiga chip.
• Some screws not rusty.
• Chinon Floppy Drive.
• Membrane + Keyboard Controller.
• Springs and keyboard contacts.
• Amiga External Case.

Gallery:

Gift received: Commodore Amiga 500+ / TI-99/4A / 2 x Commodore 64C

Computers:

• 1 x Commodore Amiga 500+ (Spare Parts)
• 1 x Texas Instruments TI-99/4A
• 2 x Commodore 64C (One for Spare Parts)

I thank my dear friend Paolo Cognetti.

Commodore Amiga 500 (ASSY 312510 REV.5) Repair

Defect:

• Black Screen.

Repair:

• Replaced a 74LS244 (U35)
• I have removed a rusty part of the pcb to see if the tracks are interrupted or in a bad state.

Note:

• This Amiga has already been repaired in years past, not from me.

Gallery of the repair:

Commodore Amiga 500 (ASSY 312510) Repair

Defect:

• Garbage boot Screen (see photo).

Repair:

• Replaced 1 x FAT Agnus 8371

Gallery of the repair:

Commodore Amiga 500+ (Battery Acid Leaked) Repair

Defect:

• Battery Leaks.

Components replaced and fixes:

• Battery Removed.
• Cleaned the PCB with PCC Kontakt
• Sprayed DUE-CI G-22 on all IC sockets.
• Made ten bridges to restore the traces corroded by the acid of the battery.
• Replaced 1 x 74LS244 (U12)
• Replaced 1 x 74LS373 (U13)

Gallery of the repair:

Keyboard #1

Defect:

• When the keyboard is connected, the computer doesn’t work (black screen)

Components replaced:

• 1 x 74LS132P (U4)

Keyboard #2

Defect:

• The Caps lock flashes three times and the keyboard doesn’t work.

Fix:

• Cold solder joint on the capacitor (C11)

Gallery:

Batch of repairs in one week (report):

• 1 x Amiga 500 (Green screen of death – Replaced 4 x DRAM)
• 1 x Amiga 500+ (Leaked battery acid – Cleaning / Replaced GARY socket)
• 1 x Amiga 600 (Distorted Clipped Saturated audio – Replaced LF347 / Total Recap / Cleaning)
• 2 x Amiga 600 (Total Recap / Cleaning)
• 2 x Amiga 1200 (Total Recap / Cleaning)
• 1 x Texas Instruments PHA-2037 (Missing Pb Component Video Signal – Replaced LM318)

I have done an accurate cleaning of the leaked battery acid on the mainboard.

I have also replaced the GARY socket destroyed by battery acid and rebuild a pcb track with a wire.

Gallery of the repair:

The problem of the green screen of death is usually due to a problem of DRAM,FAT AGNUS (chip or socket), GARY.

In this case all four DRAMs are failed. The pin 18 (IO/3) was always at high level.

Replacing DRAM everything has started to work properly.

Gallery of the repair:

There is nothing simpler than burning the Kickstart ROM at home :D

Gallery:

Below you can download the Amiga Kickstart 3.1 rom already ready for programming, the only thing that you have to do is the “Byte Swap” with your programming EPROM software.

Download: Amiga 500/600/1200/2000/4000 Kickstart 3.1 ROM + Docs (688)

NOTE: Download REMOVED (DMCA infringement)

Click to view original size

I have repaired a Commodore Amiga 2500 (A2000 Motherboard) with Black Screen for a dear friend.

Click to view original size

Defect:

• Black Screen.

Diagnosis:

• The Battery Acid has corroded a track (not visible to the naked eye) connected to the PIN 10 of the resistor packs RP900 and then the same track is connected to the CPU.

Repair:

• I have made a small bridge between the two points on the solder side of the pcb  and the problem was fixed in 5 minutes.

I have received a Commodore Amiga 500 to use as spare parts. I decided to restore because it’s a ASSY 312512 (Revision 3) with key-switch like IBM chiclet keyboards.

The cleaning took me a whole day but with a great satisfaction at the end of the work. The Commodore Amiga 500 works fine, the floppy drive reads very well and i have added a memory expansion (FAST RAM) of 512k.

Gallery of images (before and after cleaning):

Read more…

I must thank my friends which have contributed to the growth of my Repair Laboratory with donations of spare parts.

For this donation i thank: Andrea Pierdomenico, Paolo M.R, Paolo Cognetti.

The items listed below are in poor condition and they are not working.

Donated items:

• 2 x Atari 800 XL
• 1 x Amstrad CPC 464
• 1 x Sinclair ZX Spectrum +2
• 2 x Sinclair ZX Spectrum 48k
• 3 x Commodore 6499
• 1 x Joystick Spectravideo
• 1 x Joystick Suncom Slik Stik
• 1 x Joystick Competition Pro deluxe version (PC)
• 1 x Commodore VIC-20 RF Modulator
• 1 x Commodore VIC-20
• 1 x Philips MSX VG-8020
• 3 x Commodore 64 Power Supply
• 1 x Commodore Amiga 500 Power Supply
• 1 x Philips NMS 800 Data Recorder
• 1 x SVI Spectravideo 904 Data Cassette
• 1 x SVI Spectravideo 728 MSX Home Computer
• 1 x Commodore 16
• 1 x Commodore Floppy Drive 1541
• 1 x Apple IIc
• 6 x Sinclair Spectrum Microdrive (only the drive)
• 1 x Motherboard XT Clone
• 1 x Motherboard XT IBM 5150
• 1 x Power Supply Clone XT 5150
• 1 x MDA Graphics Card ISA
• 1 x Floppy Controller ISA
• 1 x Motherboard Amiga 600
• Some Floppy Disk.
• Some Tape Cassette.
• Some cables.

I must thank my friends which have contributed to the growth of my Repair Laboratory with donations of spare parts.

Donated items:

• 2 x Sega Dreamcast
• 1 x Sinclair 128+
• 2 x Amiga 500 Memory Expansion
• 1 x Amiga Powersupply
• 1 x Philips Multi Voltage Power supply
• 1 x Commodore CBM/PET Power supply (complete and working)
• 1 x 8088 Motherboard (Clone)
• 1 x Floppy Drive Controller (ISA Card)
• 1 x MDA/Parallel Controller (ISA Card)
• 1 x PC Clone (8088) Power supply
• 6 x Unknown Adapter/Interface
• 1 x Atari 7800 Motherboard
• 1 x Sinclair ZX Spectrum 48k Motherboard
• 1 x Pong Clone Motherboard
• 1 x Amstrad CPC 464 Motherboard
• 1 x Commodore 6499
• 1 x Power Supply C64/VIC20 (Clone)

I thank Fabio Bovelacci (Frater Sinister) for the donation.

Donated item:

• 1 x Sinclair ZX Spectrum 48k
• 1 x Sinclair ZX Spectrum + PSU (50% Boxed)
• 1 x Sinclair Thermal Printer
• 1 x Sinclair ZX Interface 1
• 4 x Sinclair Microdrive Boxed
• 1 x Interface Midi Master for Amiga 500/2000
• 1 x Vic-20 Cartridge VIC-1941 (Number Nabber / Shape Grabber)
• 1 x Vic-20 Cartridge VIC-1922 (Cosmic Cruncher)
• 1 x Harey Alien Invaders Handheld game
• 4 x IC Motorola 68000
• 1 x IC MOS 5719 (Amiga Gary)
• 2 x IC CGS 5719 (Amiga Gary)
• 3 x IC CGS 8362 (Amiga Super Denise)
• 1 x IC CGS 8364 (Amiga Paula)
• 2 x IC MOS 8364 (Amiga Paula)
• 5 x IC CGS 8520 (Amiga CIA)
• 1 x IC MOS 8520 (Amiga CIA)
• 2 x IC Amiga Kickstart ROM v1.3