Atari Stacy General Maintenance

This article covers general maintenance procedures for the Atari Stacy portable computer. The Stacy presents unique maintenance challenges compared to desktop ST models due to its integrated LCD, trackball, external power supply, and internal NiCd battery.

Safety precautions

• Disconnect the external AC adapter before opening the case or performing any internal work.
• Use an anti-static wrist strap when handling the motherboard or ICs.
• Work on a clean, well-lit, non-conductive surface.
• NiCd batteries are hazardous waste — dispose of leaked or spent cells according to local regulations.

⚠ NiCd battery — critical issue

The Stacy contains an internal NiCd (Nickel-Cadmium) battery pack for the real-time clock. This battery is the single most common source of damage in surviving Stacy units. NiCd cells manufactured in the late 1980s are prone to leaking corrosive electrolyte (potassium hydroxide), which attacks PCB traces, corrodes component leads, and can cause irreparable board damage if left unchecked.

Inspection

• Open the case and locate the NiCd battery pack on the main board.
• Inspect for any white or green crystalline deposits around the battery and nearby components.
• Check for darkened or eaten-away PCB traces in the battery area.
• Even if the battery appears intact, it should be removed preventively from any Stacy that has not already had this addressed.

Cleaning battery leakage

1. Remove the battery pack immediately, cutting leads if necessary.
2. Neutralise leaked electrolyte with white vinegar (acetic acid) applied via cotton swab — NiCd electrolyte is alkaline (KOH), so an acid neutraliser is appropriate.
3. Clean the affected area thoroughly with isopropyl alcohol (99%+) and lint-free swabs.
4. Inspect PCB traces under magnification. Repair broken traces with 30 AWG Kynar wire.
5. Check continuity on all traces in the affected area with a multimeter.
6. Allow the board to dry completely before reassembly.

Replacement

• The original NiCd pack can be replaced with a modern NiMH equivalent of the same voltage and physical dimensions.
• Alternatively, remove the battery entirely if real-time clock functionality is not required. The Stacy will still boot and operate normally without it — the date and time will simply reset at each power cycle.
• Do not install a non-rechargeable lithium battery in the NiCd holder, as the charging circuit will attempt to charge it.

Opening the case

1. Disconnect the AC adapter and all peripherals.
2. Place the Stacy upside down on a padded surface.
3. Remove the screws from the bottom case (Phillips head).
4. Carefully separate the case halves, noting any ribbon cables connecting the upper (display) section to the lower (motherboard) section.
5. Take care with the LCD ribbon cable — this flex cable connects the display panel to the main board and is fragile.

LCD care

Cleaning

• Clean the LCD surface with a microfibre cloth dampened with distilled water.
• Do not use ammonia-based cleaners (e.g. Windex) on the LCD panel — ammonia damages the polarising film.
• Do not press hard on the LCD surface. Passive matrix LCDs are pressure-sensitive and can develop permanent marks.

Backlight

The Stacy LCD uses a CCFL (Cold Cathode Fluorescent Lamp) backlight. CCFL tubes degrade over time and may dim, flicker, or fail completely.

• Dimming — Expected over decades of use. An LED backlight conversion can restore brightness.
• Flickering — Usually indicates inverter board failure or CCFL tube end-of-life.
• No backlight — Check the inverter board and CCFL connections before assuming the tube is dead.

Contrast

An external contrast adjustment wheel is located on the side of the case. If the display appears washed out or too dark, adjust this first. If the contrast range is insufficient, the LCD panel or its driver board may be degrading.

Trackball maintenance

The built-in trackball collects dust and debris inside the ball cavity over time.

1. Remove the trackball retaining ring (twist anti-clockwise).
2. Lift out the ball.
3. Clean the ball with warm soapy water, dry thoroughly.
4. Clean the internal rollers and encoder wheels with isopropyl alcohol and a lint-free swab.
5. Inspect the encoder wheels for cracks.
6. Reassemble in reverse order.

Keyboard maintenance

• Individual key caps can be removed with a standard keycap puller for cleaning.
• Clean under the keys with compressed air.
• The keyboard connects to the main board via a ribbon cable — inspect for oxidation or damage if keys are unresponsive.
• If multiple keys fail in a row or column pattern, suspect the keyboard membrane or ribbon cable rather than individual switches.

External PSU maintenance

The Stacy uses an external AC adapter brick (DC 18V, 2.0A, 36W). The PSU should be checked periodically:

• Inspect the DC cable and connector for fraying or damage.
• Measure output voltage under no-load and under load — it should read approximately 18V DC.
• If the PSU emits buzzing, whining, or ticking sounds, the internal capacitors may need replacement. The brick can be carefully opened (usually glued or ultrasonically welded) for recapping.

Floppy drive maintenance

• Head cleaning — Clean with IPA and a lint-free swab every 6–12 months if the drive is in regular use.
• Drive belt — The floppy drive uses a rubber belt for head positioning. Inspect for stretching or cracking. Replacement belts are available from retro computing suppliers.
• Eject mechanism — Lubricate the eject lever mechanism with a small amount of white lithium grease if stiff.

Internal SCSI hard drive

Models with an internal SCSI hard disk (Stacy 2 with HD, Stacy 4) use 3.5-inch Conner Peripherals drives.

• These drives are 30+ years old and prone to mechanical failure.
• Listen for clicking, grinding, or failure-to-spin-up sounds.
• Replacement options include period-correct SCSI drives or modern SCSI-to-SD card adapters (e.g. SCSI2SD).
• Check SCSI termination — the internal drive should be terminated if it is the only device on the SCSI chain.

Retrobrite

The Stacy's charcoal-grey plastic is less prone to yellowing than beige-coloured ST models. If discolouration has occurred, refer to the Retrobrite page for treatment procedures.

Related maintenance pages

• Atari Stacy
• Atari Stacy Troubleshooting Guide
• Atari Stacy Capacitor Replacement Guide