Commodore VIC-20 Repair
Commodore VIC-20 Repair
Defect:
- Black screen … then black and white image.
Replaced parts:
- Replaced 1 x 901486 KERNEL ROM (U12)
- To fix the problem of the image in black and white i have adjusted the “RED” trimmer (C48)
Commodore VIC-20 Repair
Defect:
Replaced parts:
Commodore 16 Power Supply Repair
Defect:
Replaced parts:
Atari 2600 Repair
Defect:
Replaced parts:
Commodore CBM 4032 (40 Columns) Repair
Defect:
Replaced parts:
This Commodore PET 2001-8C also includes a homemade Power Amplifier to hear the sound of some games that use the pin CB2 of the User Port as audio output.
Also is included a reset button and two mini-led (Red / Green) that display the data (Save / Load) when using the tape recorder.
Some photos of the Commodore PET 2001-8C:
Copyright label on the motherboard:
Some photos of the repairing and cleaning:
Commodore PET 2001 (Chicklet) Repair datassette.
Defects:
Repair:
Thanks to Manosoft for the spare parts (white datassette, the same model of the black one)
Commodore PET 2001 (Chicklet) Repair.
Defects:
Repair:
Video of Galaxy Invaders with Sounds:
from Wikipedia homepage:
The Commodore PET (Personal Electronic Transactor) was a home/personal computer produced in 1977 by Commodore International. A top-seller in the Canadian and United States educational markets, it was Commodore’s first full-featured computer, and formed the basis for their entire 8-bit product line.
Gallery:
Restoration the external case of the Micro Peripherals Ltd Floppy Disk Drive that was eaten by rust.
Gallery:
Commodore CBM(PET) 4032 (FAT40) / 8032 Cathode Ray Tube (CRT) Replacement.
The cathode ray tube was taken from the Amstrad GT-65 (Monochrome monitor)
The CRT Tube Orion 310GNB31 (Amstrad GT-65) is fully compatible with the Amperex M31-334GH (CBM 4032/FAT40 – 8032).
NOTE: The same CRT work perfectly for the computer Radio Shack TRS-80 Model 3 and Model 4.
Gallery of the repair:
Texas Instruments TI-99/4A Repair (#1)
Defect:
Replaced parts:
Texas Instruments TI-99/4A Repair (#2)
Defect:
Replaced parts:
Note:
In one photo you can see the curious change made in this TI-99/4A by inserting a resistor in the pitch where in other motherboards is soldered a leg of a electrolytic capacitor and then one leg of the capacitor is welded and the not the other leg. Compliments.
Video of the defects:
Gallery of the repair:
Repair Commodore Amiga 600 (White Screen)
Defect:
Replaced parts:
Note:
I have thought it was a problem of RAM (U17) since i have measured oddities but the problem instead is a capacitor of 10uF, dead LM555 (smd) and some pcb tracks corroded.
Repair Philips 8220 (MSX2) Black Screen with Sound.
Defect:
Replaced parts:
Note:
The main problem was caused by the lack of +12 volts that power the RGB Encoder module. The other voltage of -12 volts are used only for the cartridges port (but not all cartridges using this voltage)
I wanted to do a experiment to install a standard PC drive with a adapter (34 pins to 14 pins) on a Philips 8245. I would say that it work but i have tried about 20 Floppy Drives and only 1 it works ;-D
Gallery:
Download: Philips NMS 8245 (MSX2) Floppy Drive replacement (1130)
source: msx.hansotten.com
Gallery of the repair:
Phonola NMS 8245 (MSX 2) Repair.
Defect:
Replaced parts:
Other:
Removing the filter capacitors that are exploded inside the Astec power supply of a Apple //e.
Gallery of the repair and cleaning:
I start to saying how much i hate repairing psu switching, one of the most boring things second only to the repair of CRT Monitor, at least for me.
However this repair was made. The failure is almost certainly caused by a copious spillage of electrolyte (conductive fluid usually formed from a salt solution or acid which is located inside of the electrolytic capacitors) and a dangerous test if the machine works again after the electrolyte was leaking over the pcb.
The moral of the story is easy to figure out, a short circuit has made several deaths, a good portion of the Primary (PWM) and Secondary.
The components that have been replaced are the following:
After 1 week i have decided to replace also all capacitors of the power supply section of the computer.
Components replaced:
Gallery of the repair:
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