K Service Source
Macintosh II/IIx/IIfx
K Service Source
Basics Macintosh II/IIx/IIfx
Basics Overview - 1 Overview
This manual includes complete repair procedures for the Macintosh II, Macintosh IIx, and Macintosh IIfx.
Figure: Macintosh II, IIx, IIfx
K Service Source
Specifications Macintosh II/IIx/IIfx
Specifications Processor - 1 Processor
CPU
Macintosh II Motorola 68020 microprocessor 15.6772 MHz Optional built-in paged memory management unit (PMMU)
Macintosh IIx Motorola 68030 microprocessor 15.6772 MHz Built-in paged memory management unit (PMMU)
Macintosh IIfx Motorola 68030 microprocessor 40 MHz Built-in paged memory management unit (PMMU)
Specifications Processor - 2 Coprocessor
Macintosh II Motorola 68881 math coprocessor
Macintosh IIx/IIfx Motorola 68882 math coprocessor
Addressing 32-bit registers 32-bit address bus 32-bit data bus
Specifications Memory - 3 Memory
RAM
Macintosh II/IIx 1 MB, expandable to 8 MB
Macintosh IIfx 4 MB standard, expandable to 8 MB
ROM
Macintosh II/IIx 256K
Macintosh IIfx 512K
Specifications Disk Storage - 4 Disk Storage
Floppy Drive
Macintosh II Internal 800K floppy drive Optional second internal 800K floppy drive Optional internal 1.4 MB floppy drive upgrade
Macintosh IIx/IIfx Internal 1.4 MB floppy drive Optional second internal 1.4 MB floppy drive
Hard Drive Optional internal 40, 80, or 160 MB hard drive
Specifications I/O Interfaces - 5 I/O Interfaces
Expansion Processor-direct slot (PDS)
SCSI 5 MB/sec. transfer rate Eight device maximum
Apple Desktop Bus Two ADB ports allow daisy-chaining of peripheral devices
Serial Two RS-232/RS-422 serial ports; mini DIN-8 connectors
NuBus Six internal NuBus slots support full 32-bit address and data buses
Specifications Sound and Video - 6 Sound and Video
Sound Generator Apple’s custom digital sound chip provides 8-bit stereo sampling at 44.1 kHz and includes four-voice, wavetable synthesis; capable of driving stereo headphones or other stereo equipment through the sound jack.
Specifications Electrical - 7 Electrical
Line Voltage 100–240 VAC, automatically configured
Frequency 48–62 Hz, single phase
Maximum Power
Macintosh II/IIx 220 W (not including monitor power)
Macintosh IIfx 230 W (not including monitor power)
Specifications Physical - 8 Physical
Dimensions Height: 5.5 in. (14.0 cm) Width: 18.7 in. (47.4 cm) Depth: 14.4 in. (36.5 cm)
Weight 24 lb. (10.9 kg) Weight will be greater with internal hard drive. K Service Source
Troubleshooting Macintosh II/IIx/IIfx
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 Chord - 2 Symptom Charts Error Chord
Error chord sounds 1 Perform SIMM verification on customer’s logic board. during startup Replace Apple-labeled SIMMs manufactured by NEC that have sequence date code of 9052 or below. 2 Replace logic board. Retain customer’s SIMMs.
Troubleshooting Symptom Charts/System - 3 System
Does not power on— 1 Check cables. screen is black, fan is 2 Plug monitor directly into wall socket, and verify that not running, and LED monitor has power. is not lit 3 Replace power cord. 4 Check batteries. Refer to “Battery Verification” in Additional Procedures. 5 Replace power supply. 6 Replace logic board. Retain customer’s SIMMs.
Clicking, chirping, 1 Remove additional NuBus cards. or thumping 2 Replace power supply. 3 Replace logic board. Retain customer’s SIMMs.
Troubleshooting Symptom Charts/System (Continued) - 4
System (Continued)
System shuts down 1 Make sure air vents on sides and top of case are intermittently unobstructed. Thermal protection circuitry may shut down system. After 30–40 minutes, system should be OK. 2 Replace power cord. 3 Check batteries. Refer to “Battery Verification” in Additional Procedures. 4 Replace power supply. 5 Replace logic board. Retain customer’s SIMMs.
System 1 Make sure system software is correct version. intermittently 2 Make sure software is known-good. crashes or locks 3 Remove additional RAM and NuBus cards. 4 Replace logic board. Retain customer’s SIMMs. 5 Replace SIMMs. 6 Replace power supply.
Troubleshooting Symptom Charts/System (Continued) - 5
System (Continued)
System doesn’t boot Replace Apple-labeled SIMMs manufactured by NEC that have date code of 9052 or below.
Troubleshooting Symptom Charts/Video - 6 Video
Screen is black, audio 1 Adjust brightness on monitor. and drive operate, fan 2 Verify monitor works with another Macintosh. is running, and LED is 3 Replace monitor. Refer to appropriate monitor manual to lit troubleshoot defective monitor. 4 Replace video cable. 5 Move video card to different slot. 6 Replace video card. Refer to Video Cards manual. 7 Replace SIMMs. 8 Replace logic board. Retain customer’s SIMMs. 9 Replace power supply.
Troubleshooting Symptom Charts/Video (Continued) - 7
Video (Continued)
Screen is black, audio 1 Replace video cable. and drive do not 2 Move video card to different slot. operate, but fan is 3 Verify monitor works with another Macintosh. running and LED is lit 4 Replace video card. Refer to Video Cards manual. 5 Replace SIMMs. 6 Replace logic board. Retain customer’s SIMMs. 7 Replace power supply. 8 Replace monitor. Refer to appropriate monitor manual to troubleshoot defective monitor.
Troubleshooting Symptom Charts/Video (Continued) - 8
Video (Continued)
Screen is completely 1 Plug monitor directly into wall socket, and verify that dark, fan is not monitor has power. running, and LED is 2 Check batteries. Refer to “Battery Verification” in not lit Additional Procedures. 3 Replace power supply. 4 Replace logic board. Retain customer’s SIMMs.
Video display Replace Apple-labeled SIMMs manufactured by NEC that have date exhibits ghosting code of 9052 or below.
System boots and then Replace Apple-labeled SIMMs manufactured by NEC that have date loses video code of 9052 or below.
Troubleshooting Symptom Charts/Video (Continued) - 9
Video (Continued)
Partial or whole 1 Verify monitor works with another Macintosh. screen is bright and 2 Replace monitor. Refer to appropriate monitor manual to audio is present, but troubleshoot defective monitor. no video information 3 Replace video cable. is visible 4 Move video card to different slot. 5 Replace video card. Refer to Video Cards manual. 6 Replace logic board. Retain customer’s SIMMs.
Troubleshooting Symptom Charts/Floppy Drive - 10 Floppy Drive
Internal floppy drive 1 Replace bad disk. runs continuously 2 Replace internal floppy drive cable. 3 Replace internal floppy drive. 4 Replace logic board. Retain customer’s SIMMs.
Audio and video are 1 Replace bad disk. present, but one 2 Verify that all external SCSI devices are disconnected. internal floppy drive 3 Replace internal floppy drive cable. does not operate 4 Replace internal floppy drive. 5 Replace logic board. Retain customer’s SIMMs. 6 Replace power supply.
Troubleshooting Symptom Charts/Floppy Drive (Continued) - 11
Floppy Drive (Continued)
Audio and video are 1 Replace bad disk. present, but neither 2 Verify that all external SCSI devices are disconnected. internal floppy drive 3 Replace logic board. Retain customer’s SIMMs. operates 4 Replace power supply.
Disk ejects; display 1 Replace disk with known-good system disk. shows icon with 2 Replace internal floppy drive cable. blinking “X” 3 Replace internal floppy drive. 4 Replace logic board. Retain customer’s SIMMs.
Will not eject disk 1 Switch power off and hold mouse button down while switching power back on. 2 Replace internal floppy drive.
Troubleshooting Symptom Charts/Floppy Drive (Continued) - 12
Floppy Drive (Continued)
Attempts to eject disk 1 Reinsert disk. but doesn’t 2 Reseat top cover so drive slots align correctly.
MS-DOS drive does To read and write files with either MS-DOS or 1.4 MB drive, not recognize disk format all disks with MS-DOS drive first. formatted on 1.4 MB drive
Troubleshooting Symptom Charts/Hard Drive - 13 Hard Drive
Internal hard drive 1 Remove hard drive data cable. will not operate; LED 2 Replace internal hard drive power cable. doesn’t light; drive 3 Verify +5V and 12V lines to hard drive. doesn’t spin 4 Replace internal hard drive. 5 Replace logic board. Retain customer’s SIMMs.
Works with internal 1 Verify that SCSI device switch setting on external device hard drive or isn’t 0 (internal hard drive address) or 7 (computer external SCSI device address). but not with both 2 Verify proper SCSI termination. Refer to “SCSI Termination” in Additional Procedures. 3 Replace SCSI terminator on external device. 4 Troubleshoot external SCSI device.
Troubleshooting Symptom Charts/Hard Drive (Continued) - 14
Hard Drive (Continued)
Drive icon does not Verify proper SCSI termination. Refer to “SCSI Termination” in appear on desktop Additional Procedures.
Data is lost or Verify proper SCSI termination. Refer to “SCSI Termination” in corrupted Additional Procedures.
Troubleshooting Symptom Charts/Peripherals - 15 Peripherals
Cursor does not move 1 Check mouse connection. 2 Inspect inside of mouse for buildup of dirt and other contaminants. Clean mouse if necessary. 3 If mouse was connected to keyboard, connect it to rear ADB port instead. If mouse works, replace keyboard. 4 If mouse does not work in any ADB port, replace mouse. 5 Reset PRAM. 6 Remove additional NuBus cards. 7 Replace logic board. Retain customer’s SIMMs.
Cursor moves, but 1 Replace mouse. clicking mouse 2 Replace logic board. Retain customer’s SIMMs. button has no effect
Troubleshooting Symptom Charts/Peripherals (Continued) - 16
Peripherals (Continued)
No response to any 1 Check keyboard connection to ADB port. key on keyboard 2 Replace keyboard cable. 3 Replace keyboard. 4 Replace logic board. Retain customer’s SIMMs.
Double-click doesn’t 1 Remove multiple system files on hard drive. open application, 2Clear parameter RAM. System 7: Hold down