service, without the need for completeness
Complete restoration and service of '80s, '90s Commodore, Commodore Amiga, Commodore PC, ZX Spectrum, Enterprise, Amstrad/Schneider CPC, HT, Videoton TVC, and Atari computers, displays, and accessories.
I am primarily a restorer of old computers, so in addition to the possible repair of brought-in machines and devices, their complete inspection, Re-Cap, testing, and cleaning will always be done. Disassembling and rebuilding the repaired computers. Replacing corroded, oxidized slots and connectors if necessary. I spend almost the same amount of time on all machines and devices, this is why the waiting time is longer during a restoration. But in return, I eliminate possible warranty problems and others.
Writing ROM content to UV EPROM with PIN 24 – 28 panel converter if needed. Writing an official Cloanto or Hyperion Kickstart ROM, even with a switchable version (panel-mounted version).
„Re-Cap”, replacing the entire electrolyte capacitor in devices (replacement of radial, axial, and chip capacitors, only for the same type). The Re-Cap is made with a selection of NICHICON 5000h 20% capacitors. For Amiga computers with PANASONIC 5000h 20% capacitors. As Axal capacitors are difficult to purchase, the value in manufacturer and in money may vary.
calibrating, repairing video, VGA displays
calibrating, servicing floppy drives
replacing keyboard membrane
repairing keyboards with rubber contacts, occasionally re-graphitizing, replacing keys
restoring mountable iron core (heavy) and switching (light) power-supplies
loadability testing power-supplies
manufacturing video cables for computers (with Scart, RCA, S-Video endings)
doing any possible modifications on computers
installing reset button
replacing batteries for modern, replaceable, and fixed models
replacing rubber feet, with aftermarket color, identical feet
Before you read on, here are a few tips on getting started with Commodore computers: get started with Commodore 64, SX-64, 16, 116, Plus 4 és 128.
The servicing process is always documented electronically. I use the „Worksheet 3” server program (which communicates with e-mail clients) for registration. An electronic series of photos will also be prepared for documentation, of which I give free run.
A series of photos will be taken of all devices received in person or by post. In the process of servicing, I document every step with photos and I supplement a detailed description of it on the worksheet.
Upon arrival, the device(s) will also receive a scheduled date for the actual repair. Due to the large number of devices, this planned date is calculated several months in advance, however, for example, if I spend 1-1,5 days more with a device (in case of a more serious problem), this date may unfortunately shift.
Due to large number of devices for years, I cannot ensure an inspection too. If an outstanding event occurs during restoration, I will contact the customer. So you can decide on continuation.
As the servicing process, all devices undergo a complete external-internal chemical cleaning, panels undergo a complete „Re-Cap”, chemical cleaning. I also neutralize spilled electrolyte fluids, so they can’t do any further damage.
At the same time: checking the entire sealing, foils (treating tin corroded by trace, pad, and alkali), repairing them if needed, cleaning contacts. Connectors with contact errors will be replaced. Fully checking and adjusting displays and drives.
Repaired devices will only be handed over after a 30-minute trial run and hardware test.
After that, all information that happened with the device will be added to the worksheet. After the worksheet is completed, a series of photos taken during service will also be handed over.
If the repaired device was delivered by post, it will only be sent as a personalized registered post or postal parcel. I will also provide the copy receipt of the dispatch proof for the customer.
Electrolyte capacitor and alkaline battery electrolyte leaks are also a problem with THT (with a hole) technology.
The liquid on the PCB (panel) not only rottens the lacquer layer, but also the conductors, galvanic holes, and soldering points.
Before neutralizing electrolyte fluid, not only their causes will be removed, but also the passive elements and even ICs and slots damaged in the fluid’s surroundings.
If the electrolyte fluid is not neutralized under or around it, it will continue to rot the components and conductors. (If this is not neutralized, I have a good chance of saying, the sheet cannot be saved later.)
Through this process, the Re-Cap cost of Amiga devices is higher.
The cost is 15.000 HUF for Commodore Amiga 500, 500+ devices, which includes wage costs and materials, but does not include the disassembling and rebuilding of ICs (+ repair if necessary) + washing
For Commodore Amiga 1000, 1500, 2000 computers, the price will be determined after testing + washing
AGA computers, Amiga 1200, 3000, 4000, CD32, and Amiga 600 are made with SMD (surface mounted) technology. Although the latter is not AGA, but SMD technology.
These early SMD electrolyte capacitors contain corrosive electrolyte fluids that cause much more damage to the PCB than THTs.
This fluid destroys not only the conductors but also the pads and coils (Delay and BPF) too.
Therefore, when these capacitors are removed, 100-150 passive components in their environment will also be replaced. Moreover, ICs in their environment will be disassembled and rebuilt. This ensures safe neutralization of the electrolyte fluid.
I have found in more cases that every computer with Re-Cap died within a few months. This is because this liquid continues to have a detrimental effect under the lacquer layer and ICs. In this case, you can save 50% of the sheet.
Through this process, the Re-Cap cost of Amiga computers is higher.
The cost is 28.000 HUF for Commodore Amiga 600, 1200 devices, which includes wage costs and materials (+ repair if necessary) + washing
The cost is 30.000 HUF for Commodore Amiga CD32, which includes wage costs and materials (+ repair if necessary) + washing
For Commodore Amiga 3000, 4000 computers, the price will be determined after testing + washing
Because these devices are nearly 30 years old, there are almost no commercially available new parts for them. Therefore, in the vast majority of cases, we use disassembled parts for repair. Thus, the part prices can be from 1 HUF to thousands of forints. The latter largely depends on the purchase price of the demountable devices. It can happen that the price of the same part may be different, so please inquire in each case.
The service and restoration fee is 3.500 HUF/hour, which will be charged in thirty minutes.
As I said, these devices were made in the 80s and 90s and no parts can really be found for them anymore. Their production ended at the end of the Commodore and MOS era. What we come across are also untested parts left in stock. What makes it even more difficult to repair is that support parts in the devices, such as the production of logic ICs and passive elements have also been stopped for a long time. All that’s left is to extract the working parts from the found devices, which thus qualify as disassembled parts.
What we must not forget, that these devices were manufactured to work only for a few years. The fact that they work to this day… no one understands. There is no proper directive on the storage and operation of these devices, which would affect their warranty and operation. We have experienced that after renovation, turn on the computer(s) every month, or at least every few months to keep them in good condition. I can tell about their storing that if we don’t use them, store them in a bag (no need to be hermetically sealed) and put them in a closet, the room where we keep them should be heated. A musty, unheated basement or attic is sure to damage them.
Every device type has a typical component that dies in 90% of cases. We can replace these parts as long as there is a working, demountable computer to them. After that, it can only be revived if enthusiastic amateurs make substitutes for it.
But why do these MOS ICs go wrong? Mainly because they were manufactured to work for a few years and after the dissolution of the manufacturing company, there was no experience for 10, 20 years in advance. Secondly, the root of the problem must be sought in the manufacturing technology. The casing of ICs is plastic that ages and shrinks over the years. As a result, it stretches and breaks the very thin outlet fibers in the IC (which are connected to the legs of the IC). The ICs will still work when the outlet fibers are stretched, but when they are exposed to heat and electricity, these thin fibers will simply burn. Thus, the ICs will only work in part or not at all.
When a disassembled part is installed into computers, we don’t know how run-down it is or how advanced is its age. So when a computer is completed, it may not work tomorrow. To avoid this, the computers receive extreme loads during renovation, thus eliminating the possibility of later malfunction. But a later failure cannot be ruled out.
Overall we can say that the classic warranty cannot be given for these renovations.
As a collector, I also have accessories like e. g. 1581 3,5” floppy drive, for which I gave 100.000 HUF in 2019 and I know it’s a waste of money. The floppy drive can stop at any time, which can no longer be replaced (it can only be replaced with another similar drive). After replacement, however, its value is only a fraction of the purchase price. So I use it renewed as long as it works. In the meantime, it brings me a lot of joy.
You can contact us about the above and we reserve the right to make changes.
Some of the main instruments I use in restorations, but without them, my job would be almost impossible.
Fluke 54200 TV Signal Generator (with all options) and Tektronix 2430A Digital Oscilloscope (storage)
A signal generator is essential when repairing displays. The signal generator is capable of changing the parameters of video and RF outputs with PAL/NTSC/SECAM and audio mono/stereo signals.
Philips PM 5539 TV Colour Analyser, PAL/SECAM TV Tester, and Tektronix Type 141A PAL Test Signal Generator
The Philips TV colour analyzer is essential for adjusting RGB colour intensity when calibrating displays.
UNAOHM EP507A Universal Professional Field Strength Meter RF signal level meter with spectrum image
Racal-Dana 1991 nanosecond Universal Counter
Kathrein TV/Radio MeBempfänger MFK-46 (RF/Video tester), Kunkin KP182 DC Electronic Load (DC loadability test), Powerbox 3303DS DC Power Supply (DC lab power-supply), Mesr-100 ESR Meter (Elko ESR tester) and M6013 Capacitor Meter (Elko capacitor meter)
Electronic Hot Plate, heating pad for PCBs (to bring up possible heating errors)
E.M.G. Toroid instrument, gradually adjustable 0-240V AC voltage (for 110V mains devices)
OMSZÖV OE-133 (CMOS/TTL detector pen), HQ-Solder/RWF (hot air soldering station), Commodore 64, Plus 4, 128, 128D, DCR, 1541/II, 1764, 1581, Amiga, Amiga CD32, A590, Primo, Oceanic and TVC PSU (power-supply)
I use lab power-supply instead of Commodore 16, 116, ZX Spectrum 16, 48,+ és Enterprise power-supplies.
Desoldering Station, HR STVDST-01 line transformer tester
Genius G450 and GQ-4x4 (e/eeprom chip burner, TTL/CMOS and D/SRAM tester) stylishly, using a UV eprom wipe.
Commodore VIC20 and 16, 116, Plus 4 hardware test
Commodore 64, 128, 128D, 128DCR, SX-64 and ZX Spectrum 16, 48, +, 128, 128 +2, +3 hardware test
SD2iEC, XUM1541, Z80SD, Amiga CF cards, PCMCIA Adapter and Amiga trapdoor RAMs for testing
Amiga internal, external FDD, external GOTEK and Controller for testing
Commodore 64C and 128 test computers
Philips CM 8833 (SCART, Compozite, RGBi/TTL RGB) and Commodore 1801 (Compozite, Chroma-Luma) test display
Commodore SFD 1001, Amiga external - internal FDD and 1541, 1541C, 1541/II reference floppy drives and sheets
Commodore 1551, OC-188 and 1570, 1571, 128D reference floppy drives and sheets
Commodore 16 (250443 Rev. A and Rev. B 64KB expanded) and VIC 20 first and second edition reference sheets
Commodore 64 326298 Rev. A and Silver KU-14194HB reference sheets
Commodore 64 250407 (251137 Rev. B, C) and 250425, 250466 reference sheets
Commodore 64 250469 (252311 Rev. A, B) and 250469 (252311 Rev. 3, 4) reference sheets
Commodore Plus 4 and 128 reference sheets
Commodore 128D and 128DCR reference sheets
Commodore Amiga 500 Rev. 3 and 5 reference sheets
Commodore Amiga 500 Rev. 6 and 8a reference sheets
Commodore CDTV (with RAM expansion, SCSI card and HDD) and Videoton TVC reference sheet
Enterprise 128K and ZX Spectrum 48K reference sheets
we reserve the right to make changes, the price is gross (AM) price