Processor CPU Motorola 68040 microprocessor 40 MHz Built-in paged memory management unit (PMMU), floating-point unit (FPU), and 8K memory cache 32-bit registers 32-bit address/data bus A Peripheral Subsystem Controller (PSC) provides direct memory access (DMA) between the 68040 buses and peripheral devices.
Addressing
Direct Memory Access (DMA)
Specifications
Processor - 2 AT&T DSP3210 32-bit floating-point digital signal processor Supports real-time tasks such as speech recognition, audio compression, and analog modem signal processing.
Digital Signal Processor (DSP)
Specifications
Memory - 3
Memory RAM 8 MB standard (one 8 MB SIMM), expandable to 128 MB 72-pin SIMMs Requires CAS-before-RAS 60 ns access time 2 MB soldered on logic board 256 bytes of parameter memory
ROM PRAM
Specifications
Memory - 4 1 MB standard, expandable to 2 MB (80 ns or faster 256K VRAM SIMMs) Maximum pixel depths for 1 MB / 2 MB VRAM: 12-inch color (512 x 384) - 16 / 16 bits per pixel 12-inch monochrome (640 x 480) - 16 / 16 bits per pixel 13-inch color (640 x 480) - 8 / 16 bits per pixel 15-inch portrait (640 x 870) - 4 / 8 bits per pixel 16-inch color (832 x 624) - 8 / 16 bits per pixel 19-inch color (1024 x 768) - 4 / 8 bits per pixel 21-inch monochrome (1152 x 870) - 4 / 8 bits per pixel 21-inch color (1152 x 870) - 4 / 8 bits per pixel VGA (640 x 480) - 8 / 16 bits per pixel SVGA (800 x 600) - 8 / 16 bits per pixel Apple custom chip with long-life lithium battery
VRAM
Clock/Calendar
Specifications
Disk Storage - 5
Disk Storage Floppy Drive Hard Drive CD-ROM Drive Internal, 1.4 MB Apple SuperDrive Internal, 3.5 in. hard drive (230, 500, 1000 MB) optional Internal, CD-300 mechanism optional
Specifications
I/O Interfaces - 6
I/O Interfaces Serial Two RS-232/RS-422 ports (modem port is an Apple highperformance serial port) Printer port: mini DIN-8 connector Modem port: mini DIN-9 connector (also supports mini DIN-8 connector) 230.4 Kbaud maximum 0.920 mbit/sec. if external clock source is provided (modem interface only) Asynchronous and synchronous communications supported up to 9600 baud
Specifications
I/O Interfaces - 7 High-performance serial port Supports connection to analog, PBX, ISDN, facsimile (fax), and data telephone lines Provides full-duplex telephone I/O at up to 14.4 Kbps Supports AppleTalk and V.22, V.22bis, V.29, and V.32 modem protocols Supports Apple HiPPort protocols One monitor port; DB-15 connector Supports Apple monitors (up to 16-bits), VGA monitors, and NTSC and PAL video standards One S-video output port; one S-video input port; mini DIN-4 connectors Supports input/output in NTSC, PAL, and SECAM formats
GeoPort (Modem Port)
Video
S-Video Input & Output
Specifications
I/O Interfaces - 8 One composite video output port; one composite video input port; RCA phono plug connectors Supports input/output in NTSC, PAL, and SECAM formats One Ethernet port; AUI-15 connector Supports one internal 1.4 MB Apple SuperDrive Supports industry-standard 765 or Apple group code recording (GCR) formats One SCSI port; DB-25 connector Supports a maximum of eight devices (including the computer, which is always device 7) Transfers data at a maximum rate of 5 Mbps (synchronous) Automatic termination of internal and external SCSI buses
Composite Video Input & Output
Ethernet Floppy Disk
SCSI
Specifications
I/O Interfaces - 9 Three slots; 96-pin Euro-DIN connectors Supports standard-size cards, block transfers, burst-mode transfers, a processor write buffer, power control service, and NuBus `90 data transfers between cards at 20 MHz One slot supports NuBus cards that contain a Digital Audio and Video (DAV) connector One 68040 processor-direct slot (PDS); 140-pin connector
NuBus
Expansion
Specifications
I/O Interfaces - 10 One 16-bit stereo output port; one 16-bit stereo input port; mini phone-jack connectors Sample rates up to 48 kHz (44.1 kHz standard rate) Uses the digital signal processor (DSP) chip Supports stereo audio from internal CD drive and Apple PlainTalk microphone Audio input port characteristics: 26K ohms impedance, 2 V rms maximum, 22.5 dB gain Audio output port characteristics: 37 ohms impedance, 0.9 V rms maximum, attenuated 22.5 dB One Apple Desktop Bus (ADB) port for keyboard, mouse, and lowspeed input devices; mini DIN-4 connector
Audio
Apple Desktop Bus
Specifications
I/O Devices - 11
I/O Devices Keyboard Apple Keyboard, Apple Extended Keyboard, Apple Keyboard II, or Apple Extended Keyboard II (optional); mini DIN-4 connector Apple Desktop Mouse or Apple Desktop Mouse II; mini DIN-4 connector Electret, omnidirectional; output voltage is 4 mV, peak to peak, at normal value; mini phone plug connector Designed for speech recording and recognition
Mouse
Microphone
Specifications
Sound and Video - 12
Sound and Video Video Display Built-in VRAM video support for all Apple monitors; four VRAM expansion slots (two banks) Supports Apple 16-bit monitors and many non-Apple monitor types (NTSC, PAL, VGA) Multiple external color and monochrome monitors through NuBus expansion slots Enhanced Apple sound chip (EASC), including four-voice wave table synthesis and stereo sampling generator capable of driving stereo mini phone-jack headphones or stereo equipment
Sound Generator
Specifications
Electrical - 13
Electrical Line Voltage Frequency Maximum Power Power for SCSI Devices 100240 VAC 5060 Hz, single phase 200 W continuous Maximum continuous power available for each SCSI device: 1.5A @ +5 V 4.3A @ +12 V
Specifications
Electrical - 14 Maximum continuous power available for each NuBus card: 2.0A @ +5 V 0.175A @ +12 V 0.15A @ 12 V
Power for NuBus Cards
Specifications
Physical - 15
Physical Dimensions Height: 14.25 in. (360 mm) Width: 7.75 in. (196 mm) Depth: 16 in. (396 mm) 24 lb. (11.3 kg)
Weight
Specifications
Environmental - 16
Environmental Operating Temperature Storage Temperature Relative Humidity Altitude 50104° F (10°40° C)
40 to 116.6° F (40 to 47° C)
590% noncondensing 010,000 ft. (03048 m)
K Service Source
Troubleshooting Macintosh Quadra 840AV
Troubleshooting
General/ - 1
General The Symptom Charts included in this chapter will help you diagnose specific symptoms related to your product. Because cures are listed on the charts in the order of most likely solution, try the first cure first. Verify whether or not the product continues to exhibit the symptom. If the symptom persists, try the next cure. (Note: If you have replaced a module, reinstall the original module before you proceed to the next cure.) If you are not sure what the problem is, or if the Symptom Charts do not resolve the problem, refer to the Flowchart for the product family. For additional assistance, contact Apple Technical Support.
Troubleshooting
Symptom Charts/Error Chords - 2
Symptom Charts Error Chords One-part error chord sounds during startup sequence 1 2 3 Two-part error chord sounds during startup sequence Disconnect SCSI data cable from hard drive and reboot system. If startup sequence is normal, initialize hard drive. If error chord still sounds, replace hard drive. Disconnect floppy drive cable from floppy drive and reboot system. If startup sequence is normal, replace floppy drive. Replace logic board. Retain customer's SIMMs.
Perform SIMMs verification.
Troubleshooting
Symptom Charts/System - 3
System Does not power on; screen is black, fan is not running, and LED is not lit 1 2 3 4 5 6 Check power cables. Plug monitor directly into wall socket, and verify that monitor has power. Reset logic board. (Refer to Additional Procedures.) Replace power cord. Replace power supply. Replace logic board. Retain customer's SIMMs.
Troubleshooting
Symptom Charts/System (Continued) - 4
System (Continued) Clicking, chirping, or thumping sound from power supply 1 Remove all NuBus expansion cards and disconnect all internal peripherals (hard drives, CD-ROM drives, floppy drives, etc.) and power-on system again. If system powers on normally, reconnect one device at a time and replace NuBus expansion cards one at a time, powering on the system after each reconnection/reinstallation. The defective module is identified when the symptom reappears Replace power supply. Replace logic board. Retain customer's SIMMs.
2 3
Troubleshooting
Symptom Charts/System (Continued) - 5
System (Continued) System shuts down intermittently 1 2 3 4 5 Make sure air vents are clear. Thermal protection circuitry may shut down system. After 30 to 40 minutes, system should be OK. Check battery. Refer to "Battery Verification" in Additional Procedures. Replace power cord. Replace power supply. Replace logic board. Retain customer's SIMMs.
Troubleshooting
Symptom Charts/System (Continued) - 6
System (Continued) System intermittently crashes or hangs 1 2 3 4 5 6 7 Intermittent shutdowns from a cold boot Verify that system software is version 7.1 or later. Verify that software is known-good. Verify that software is System 7 compatible. Clear parameter RAM. Hold down