Macintosh Performa 5200CD General Maintenance

Macintosh Performa 5200. Photo: All About Apple museum, Wikimedia Commons, CC BY-SA 3.0.

Routine care for the Macintosh Performa 5200CD and the rest of the Performa 5200 series: the 5210CD, 5215CD, 5220CD and the Power Macintosh 5200/75 LC. These are all-in-one machines with a 15-inch CRT, so the analogue board and the tube need the same care as a compact Macintosh. Apple's Power Macintosh/Performa 5200 and 5300 Service Source is the reference for everything below; the 5260 and 5280 have a different board, supply and tube and a separate manual.

The CRT and analogue board carry lethal voltages and the tube holds its charge after unplugging. Discharge it before working near the anode or the analogue board; see CRT Discharge Procedure.

Getting inside

Apple designed the machine so that the floppy drive, CD-ROM drive and front-panel control board come out after removing the drive and control bezel, and the logic board, hard drive and video options after removing the I/O door. The logic board slides out of an edge connector like those in the LC 630 and LC 500 series (p. 10). Refit the logic board at an upward angle so it clears the EMI clips (p. 222). The power supply and analogue board are reached only after removing the rear housing, front bezel, logic board and rear EMI shield.

The CRT and degauss frame are matched at the factory and are replaced as a unit (p. 24).

Cleaning

1. Unplug the machine before cleaning.
2. Clean the case with a cloth dampened with mild soapy water; do not spray liquid onto the case or screen.
3. Clean the screen with a soft, lint-free cloth and a non-ammonia cleaner.
4. Keep the vents and the fan clear of dust.

Contact cleaner on the SIMM sockets, the processor-direct and communications slot edges and the external connectors cures many intermittent faults. See Recommended Tools for cleaners and brushes.

PRAM battery

The battery is a 4.5 V alkaline pack, shown in Apple's exploded view as a Rayovac "Computer Clock Battery". It sits on hook-and-loop tape on the logic board and connects by a plug. To check it, remove the I/O door and logic board, set a voltmeter to the 10 V DC range and measure across the pack; replace it below 3.0 V (pp. 216–217). To replace it, pull the connector up and lift the pack off its base (p. 219).

Apple's logic board reset uses the battery: with the power cord unplugged, unplug the battery, wait 5 to 10 minutes and refit it. This clears PRAM, so reset the date, time and other settings afterwards (pp. 220–223).

The pack is alkaline, so neutralise leakage with white vinegar, then clean with isopropyl alcohol and check the tracks near the battery connector for corrosion. See Battery Explosion, Capacitor or Corrosion Damage.

Identifying Rev. A and Rev. B

Apple introduced a revised "Rev. B" version a few months after launch; its design changes are not backward-compatible (p. 4).

• Remove the front bezel. Speakers in the bezel: original version. Speakers on the sides of the metal chassis: Rev. B.
• The label on the lower rear of the case reads 620-0635 or 620-0835 on the original version and 620-0637 or 620-0837 on Rev. B (p. 5).

Parts that differ between the versions (exploded view, p. 319)

Assembly	Original version (Rev. A)	Rev. B
Power supply	661-0331 (thermistor at CN13) or 661-0930 (no thermistor)	661-1117 (thermistor at CN9)
Analogue/video board assembly	661-0928	661-1356
Logic board (75 MHz)	661-0931 (8-bit sound)	661-1008 (16-bit sound)
Rear housing	922-1395	922-1861
Front bezel	922-1400	922-1857
Rear EMI shield	922-1476	922-2066
Speakers	922-1389	922-1858
Microphone	922-1392	922-2044
Chassis assembly	922-1390	922-2043

The three power supplies are not interchangeable; exchange them like for like (p. 140). The 8-bit and 16-bit sound designations of the logic boards come from Apple's repair part list (p. 234).

The power supply and the analogue/video board are separate assemblies. The supply connects to the Rev. A analogue board through a 6-pin cable (CN3) and a 10-pin cable (CN4); Apple warns that these connectors are keyed and very tight, and suggests loosening the sockets with a jeweller's screwdriver (p. 148).

Power and adjustments

Electrical (p. 47)

Item	Apple's figure
Line voltage	100–240 VAC
Frequency	47–63 Hz
Power	125 W
Surge voltage	300 V RMS for 100 ms
Peak inrush current	40 A
Current	2.5 A maximum for all line and load conditions
Power, all line and load conditions	220 W maximum

The supply is universal, with no voltage selector.

Apple's adjustments are light meter setup, geometry, video (cutoff and white balance) and high voltage. The high-voltage adjustment sets 29.5 V DC ± 0.1 V at D713 (Rev. A) or D703 (Rev. B) with VR501 or VR702, and is needed whenever the CRT or deflection board is replaced; the procedure is on the troubleshooting page. There is no power-supply adjustment.

Networking and software

• Open Transport 1.1 does not work on these machines; install 1.1.1 or later. If 1.1.1 reports a hardware issue, the cache/ROM DIMM needs replacing under Apple's Repair Extension Program; see Macintosh Performa 5200 (p. 7).
• Low End Mac recommends a 25-pin SCSI terminator on the SCSI port when no SCSI devices are attached, and a serial printer on the modem port when no modem is used, to improve network stability.
• A replacement IDE hard drive needs Drive Setup 1.0.3 or later; Apple HD SC Setup from System 7.5.1 and earlier does not recognise newer drives.

Related pages

• Macintosh Performa 5200CD
• Macintosh Performa 5200CD Troubleshooting
• Macintosh Performa 5200CD Capacitor Replacement Guide
• CRT Discharge Procedure
• Battery Refurbishment