Autopsy:

The JD-560 and JD -562 are a series of Floppy disk drives that can be connected externally of the computer.

They are completely applicable to IBM PC/XT/AT/386/486 compatible computers and need no any special interface cards.

Payed €12,50 a piece, that is the right price.

Practically, the price of a good pizza and a glass of water ;-D

This is a Commodore CBM 8296-D Motherboard repaired for a Friend.

Gallery of the repair:

Defect:

• Black screen of death without startup beep and after replacing U5 and U6 black screen of death with startup beep.

Replaced parts:

• Replaced PLA U5 with a original PLA MOS 324745-01.
• Replaced PLA U6 with a OTP EPROM 27C512R 70ns + Adapter
• Replaced a dual FlipFlop 74LS74 UD4.

* The replacement of the two PLA has already been made earlier by my friend.

The conditions of this Commodore 8032-SK (Gold Label) are really bad. The CBM 8032-SK is left for over 25 years in a dovecote.

The cleaning, repairing and restoration have taken a very long time, but the result is more than acceptable.

Defects:

• The Commodore 8032-SK was completely dead (Black screen of death).
• Little problems of CRT geometry.

Repair:

• Replaced the CPU 6502.
• Yoke calibration of the CRT

Gallery of repair and cleaning:

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Autopsy:

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This version of Coleco Vision SECAM (Péritel/Euroconnector) uses a PCB 91162 REV D which differs from the classical version with PCB 91209 because integrates an internal video encoder from Y (BY) (RY) to RGB which is separate from the motherboard.

This makes think that in theory all PAL versions that use the VDP 9929A with PCB 91162 REV D and RF output can be modified to have a RGB output signal by adding this external video encoder.

from Wikipedia homepage:

The ColecoVision is Coleco Industries’ second generation home video game console, which was released in August 1982. The ColecoVision offered near-arcade-quality graphics and gaming style along with the means to expand the system’s basic hardware. Released with a catalog of 12 launch titles, with an additional 10 games announced for 1982, approximately 145 titles in total were published as ROM cartridges for the system between 1982 and 1984. River West Brands currently owns the ColecoVision brand name.

In 2009, IGN named the ColecoVision their 12th best video game console out of their list of 25, citing “its incredible accuracy in bringing current-generation arcade hits home.”

Coleco licensed Nintendo’s Donkey Kong as the official pack-in cartridge for all ColecoVision consoles, helping to boost the console’s popularity. By Christmas of 1982, Coleco had sold more than 500,000 units, in part on the strength of its bundled game. The ColecoVision’s main competitor was the arguably more advanced but less commercially successful Atari 5200.

The ColecoVision was distributed by CBS Electronics outside of North America, and was branded the CBS ColecoVision.

Sales quickly passed 1 million in early 1983, before the video game crash of 1983. By the beginning of 1984, quarterly sales of the ColecoVision had dramatically decreased.

Over the next 18 months, the Coleco company ramped down its video game division, ultimately withdrawing from the video game market by the end of the summer of 1985. The ColecoVision was officially discontinued by October 1985. Total sales of the ColecoVision are uncertain but were ultimately in excess of 2 million units, as sales had reached that number by the spring of 1984, while the console continued to sell modestly up until its discontinuation the following year.

In 1986, Bit Corporation produced a ColecoVision clone called the Dina, which was sold in the United States by Telegames as the Telegames Personal Arcade.

source: wikipedia

Autopsy:

The Intelli-Table is a round, plastic activity table with a blue, removable top that uses three interchangeable play rings to help children learn numbers, music, and games.

The curiosity of this device that was developed by Mattel in cooperation with Microsoft and distributed by Fisher Price in late 90s.

This game are been withdrawn from the market for construction problems, like say the Mattel Bulletin.

Video:

The conditions of this Commodore Dual Disk 8250 LP are really bad. The CBM 8250 LP is left for over 25 years in a dovecote.

The cleaning, repairing and restoration have taken a long time, but the result is more than acceptable.

Defects:

• Floppy Disk Drive completely dead.
• Main motherboard failure: Status LED green but with the Floppy Disk Drive LEDs (red) that blink 3 times and then repeat in loop.
• Directory displayed with extra chars.

Repair:

• Replaced all the electrolytic capacitors of the two Floppy Disk Drive.
• Replaced the IC RIOT MOS 901869-01 (Memory, I / O, Timer array)
• Replaced the IC RIOT MOS 6532 (RAM-I/O-Timer)

Gallery of repair and cleaning:

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Gallery of repair and cleaning:

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This computer is arrived for a repair from a friend. The defect is the classic Black Screen of Death and also the PCB has certainly seen better days.

Defects found:

• Short circuits.
• Tracks interrupted or broken.
• Tracks partially raised.
• Jumpers with flying leads.
• Some components are partially unsoldered and soldered to other components.

Repair:

• Rebuild all the tracks interrupted or partially raised.
• Arrangement of all components removed or partially unsoldered.
• Removing flying jumpers
• Replaced CPU Zilog Z80
• Replaced a RAM 2114
• Replaced a Multiplexer 74LS157
• Replaced the ZX-81 Rom with a Eprom 2532 with programmed the ZX-80 Rom.

Mod:

• Composite video output (simple version without Transistor). It was made only to make easiest the repair.

This gallery shows some stages of the repair of the Sinclair Spectrum 48k.

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Defects found on the Sinclair Spectrum #1:

• Black Screen of Death/Garbage Screen.

Components replaced:

• 8 x 4116 RAM
• 1 x Z80 CPU

• Extra:
  • Composite Video

Defects found on the Sinclair Spectrum #2:

• There are no colors.

Components replaced:

• 5 x Electrolytic Capacitors 22uf / 16v
• 1 x SN94459 (LM 1889) Tv video Modulator IC with Chroma Reference Signal (Color)

Defects found on the Sinclair Spectrum #3:

• Jaundice problems.

Calibration:

• Calibration of Trimmer (VR2)

Defects found on the Sinclair Spectrum #4:

• Black Screen of Death.

Components replaced:

• 1 x RAM TMS4532
• 1 x Transistor ZTX650

• Extra:
  • Composite Video
  • Conversion from Spectrum (Issue 2) To Spectrum +

Defects found on the Sinclair Spectrum #5:

• Garbage Screen and high absorption on the 12v line and 0v (ground) with explosion of the transistors ZTX-650 (651) and ZTX-213

Components replaced:

• 1 x Zener 5v1
• 12 x Electrolytic capacitors
• 3 x 4116 RAM (two of these in total short circuit between pin 8 and 16)
• 8 x OKI 3732 RAM
• 1 x Sinclair ROM
• 1 x 74HCT(LS)32
• 1 x Transistor ZTX-213
• 1 x Transistor ZTX-650

• Extra:
  • Composite Video

• Info:
  • About the explosion of the transistors i have isolated the problem, are the ram (LOW).

    The bad way used some years ago was cut the pin 8 of the all 4116 ram to isolate the bad one, in this case, i didn’t cut the pins of the ram, but i have cut the track of 12v which is part of all the 4116 ram, doing so, the transistor ZTX650(651) doesn’t explode.

    At this point there is a short in one or more RAM between +12 and 0v. I have measured the absorption where i have cut the track and it absorbs too much.

    I just have to unsolder the pin 8 of the 4116 ram and trying to isolate it for find which ram is short-circuited.

• …it was not over:
  • When the repair is finished and i have replaced all OKI 3732 RAM with a new one, another IC has decided to die, a 74HC(LS)32. I have no words.

Defects found on the Sinclair Spectrum #6:

• Faulty / AutoLoad.

Components replaced:

• 1 x TMS 4532 RAM

• Extra:
  • Composite Video

Sinclair Spectrum Faulty / AutoLoad Video: