Macintosh Quadra 840AV
The Macintosh Quadra 840AV is a high-end 68040-powered desktop tower that was released in July 1993. The 840AV is one of the fastest 68k Macintoshes ever made.
Specifications |
|
| Spec | Details |
|---|---|
| Released/Discontinued | July 1993/July 1994 |
| CPU | Motorola 68040 @40MHz - AT&T 3210 DSP |
| RAM | Type: 4x 72-pin SIMM Slots Standard: 8 or 16MB Maximum: 128MB |
| Storage | 3.5" SCSI Standard: 230MB, 500MB, or 1GB |
| Graphics | 1MB or 2MB VRAM |
| Audio | Internal Speaker |
| Media Drives | Auto or Manual-inject 3.5" 1.44MB Floppy Drive 2x CD-ROM Drive (Optional) |
| Expansion | 3x NuBus Slots |
| Networking | AAUI Ethernet |
| Other I/O | - 1x Apple Desktop Bus - 2x Serial - 1x DB25 SCSI - 1x DB15 Video Out - 1x S-Video Out - 1x S-Video In - 1x Composite Out - 1x Composite In - 1x Line In - 1x Line Out |
| PRAM Battery | 1/2AA Lithium | Firmware | Old World |
| Minimum Mac OS | System Software 7.1 |
| Maximum Mac OS | Mac OS 8.1 |
Resources |
|
| Link | Details |
|---|---|
 |
Apple Macintosh Quadra 840AV Service Manual |
 |
Apple Macintosh Quadra 840AV Logic Board Schematic |
 |
Macintosh Quadra 840AV Capacitor Reference |
Common Faults & Maintenance
PRAM Battery Leaks
The 1/2AA Lithium PRAM battery in the 840AV is very prone to leaking and should be removed. It does not need to be replaced on this model for the computer to operate.
Capacitors
The 840AV's logic board has many electrolytic capacitors on it that are extremely prone to leaking. Any 840AV MUST be recapped. The traces and vias on the 840AV's logic board are also especially prone to corrosion, and they're very tiny and hard to repair. The 840AV has a reputation as such for being one of the most difficult 68k macs to repair.
Brittle Plastic
The plastic parts on the 840AV are extremely brittle, and unfortunately, plastic clips and retention pieces were used liberally inside the case. As such, it's very difficult to take an 840AV apart without damage. The front drive bezels are another part that frequently break. This plastic also yellows.
Gallery
No photos of this Macintosh are available. If you would like to help out the site, send in some photos!