Power Macintosh 5260 Troubleshooting
The tables below are Apple's symptom charts for the Power Macintosh 5260, from the manual written for the 5260 and 5280.[1] Apple lists the cures in order of likelihood: try the first, check whether the symptom persists, and refit the original module before moving to the next cure (p. 46).
The 5260 contains a CRT and a power supply and analogue board that carry mains voltage and stored charge. Discharge the CRT before working near it; see CRT Discharge Procedure.
First checklist
[edit | edit source]Jitter, faint lines or screen movement can be caused by external interference from electronic devices and fluorescent lights; move the unit to another room or building to find out. A misadjusted screen can mimic analogue board or CRT failure, so perform the adjustment procedures before replacing a module (p. 47).[1] The adjustment controls are listed in Power Macintosh 5260 General Maintenance.
A logic board reset, one of Apple's first cures, means unplugging the battery for 5 to 10 minutes and pressing the Cuda reset switch (pp. 179–181). The power-supply adjustment (R828, 110 V DC at P805 pin 3) must be redone whenever the analogue board or power supply has been taken out (p. 213).[1]
System
[edit | edit source]| Symptom | Apple's cures, in order |
|---|---|
| Intermittent crashes or hangs | Check system software is 7.5 or later and that the software is compatible; if an Ethernet card is fitted, check it is fully seated; check there is enough memory for the application. |
| Does not start up | Reset the logic board; replace the power supply; check the power cord; replace the logic board, keeping the customer's SIMMs. |
| Will not start from the keyboard, but starts from the rear power switch | Check the keyboard with a known-good one; replace the analogue board. |
| Restarts after Shut Down from the Special menu | Check the keyboard with a known-good one; replace the analogue board. |
| Flashing question mark at startup, PDS and communications slots empty | Check the hard drive with Disk First Aid from the Power Macintosh CD-ROM and repair it; if it cannot be repaired, back up and reformat with Drive Setup 1.0.3; update the driver with Drive Setup 1.0.3; clean-install the system. |
| Menu bar flashes or the system beeps constantly | Check the front-panel buttons are not jammed; check "mute" is not selected in the Sound control panel; reseat the drive bezel and front panel control board. |
Source: pp. 48–50.[1]
Audio
[edit | edit source]| Symptom | Apple's cures, in order |
|---|---|
| Distorted or garbled sound from both speakers | Replace the analogue/video board assembly. |
| Distorted or garbled sound from one speaker | Replace the speaker; replace the analogue/video board assembly. |
| Sound distortion with an MPEG board fitted | Replace it with a modified MPEG board, which has a jumper from U5 pin 2 to D1 pin 1. |
| No sound from the speakers | Check the sound source; check the speaker cable at P601 on the analogue board; reseat the drive bezel and front panel control board. |
| Crackling on sounds other than system beeps, not in play-through mode | If the static changes as the volume is changed in the Sound control panel, install Audio Volume Extension 1.1 or later; replace the logic board. |
| No sound from known-good external speakers | Check the volume is on; check headphones are unplugged; check the speaker connectors; replace the logic board. |
Source: pp. 51–52 and 72.[1]
Video
[edit | edit source]| Symptom | Apple's cures, in order |
|---|---|
| Screen black, too dark or too bright; audio and drives work | Adjust the contrast button on the front bezel; adjust brightness in the Screen control panel; check the yoke cable; perform the video adjustments; replace the analogue/video board assembly; replace the power supply board; replace the CRT. |
| Screen bright and audio present, but no picture | Perform the video adjustments; replace the analogue/video board assembly. |
| Video will not play, or the system hangs, with an MPEG card fitted | If U12 on the MPEG card is marked 341S0205 (printed "341SO205" in the manual), check all connections; if not, replace the MPEG card. |
| Single vertical or horizontal line | Replace the analogue/video board assembly; replace the CRT. |
| Predominant colour tint, or colour cannot be adjusted | Check the video board is firmly on the CRT socket; check the cables to the analogue/video board; replace the RGB cable; replace the analogue/video board and redo the video adjustments; replace the CRT. |
| Out of convergence | Apple says this rarely means a defective module and some misconvergence is normal, especially at the edges; replace the analogue/video board assembly. |
| Black spots on the screen (burnt phosphor) | Replace the CRT. |
| Picture breaks into diagonal lines, or rolls | Perform the geometry adjustments; replace the analogue/video board assembly. |
| Screen jitters or flashes | Work the first checklist: move other monitors and electrical equipment away, turn off fluorescent lights, try another room or building; replace the analogue/video board assembly. |
| Out of focus | Perform the focus adjustment; check the screen luminance and, if it is wrong, do the cutoff and white-balance procedures; replace the analogue/video board assembly. |
| Bad linearity (text a different size at top, bottom or sides) | Replace the analogue/video board assembly. |
| Raster tilted or shifted | Move metal objects away from the monitor; perform the geometry adjustments; replace the analogue/video board assembly. |
| Raster distorted (barrel-shaped, corners not square, sides not perpendicular) | Work the first checklist; perform the geometry adjustments; fit the monitor-adjustment cable and use the on-screen controls (Apple allows some distortion); replace the analogue/video board assembly. |
| Raster not centred | Adjust the horizontal or vertical shift control; work the first checklist. |
| White areas with blotches of colour | Move the unit (a purity problem caused by magnetic fields); degauss with a manual degaussing coil. |
Source: pp. 53–59.[1]
Floppy drive
[edit | edit source]| Symptom | Apple's cures, in order |
|---|---|
| Audio and video present, but the floppy drive does not work | Try a known-good disk; replace the floppy drive; replace the logic board. |
| Disk ejects and the screen shows a disk icon with a blinking X | Try a known-good system disk; replace the floppy drive; replace the logic board. |
| Disk will not go all the way in, or will not eject | Eject with an opened paper clip in the hole beside the drive; switch on while holding the mouse button to complete the eject cycle; replace the floppy drive. |
| Floppy drive runs continuously | Try a known-good disk; replace the floppy drive; replace the logic board. |
Source: pp. 60–61.[1] See also Floppy Drive Repair.
Hard drive
[edit | edit source]| Symptom | Apple's cures, in order |
|---|---|
| Internal or external hard drive does not work | Check the drive connections; check an external drive is terminated; reseat the logic board; replace the internal IDE drive; replace the chassis/wiring harness; replace the logic board. |
| Internal drive runs continuously | Check system software is 7.5 or later; replace the hard drive cable; replace the drive; replace the logic board. |
| Hard drive not found when started from the CD-ROM | Use Drive Setup 1.0.3 to try to mount it. |
| 5260/100 with the 1.6 GB ATA drive (661-1107): flashing question mark at startup, sometimes cleared by restarting | Check the system software is not corrupted; remove the drive and read the serial number on its bar-code label; replace the drive if the serial number is in the range XXX6 0 9 9 XXXXX to XXX6 1 3 1 XXXXX. |
Source: pp. 62–63.[1] See also Hard Drive Maintenance and Repair.
CD-ROM drive
[edit | edit source]| Symptom | Apple's cures, in order |
|---|---|
| Drive does not accept a disc | Try another disc; replace the CD-ROM mechanism; replace the SCSI data cable. |
| Volume control does not work properly | Check the Sound control panel and front-panel controls; reseat the drive and control bezel; check the front panel control board is fully in; reseat, then replace, the CD adapter connector; replace the CD-ROM drive; replace the chassis/wiring harness. |
| Known-good CD-ROM drive will not mount | Reseat the CD-ROM adapters; check the SCSI ID (set to 3 at the factory); replace the CD-ROM drive; replace the chassis/wiring harness. |
| With internal and external SCSI devices, only one starts up | Check the external device's ID is above 0 and does not clash with another; replace its terminator; replace the SCSI select cable. |
| CD Plus (CD+) disc stutters and may not mount | Replace the CD-ROM drive. |
| Eject button sticks | Replace the front bezel. |
Source: pp. 64–66.[1]
Peripherals
[edit | edit source]| Symptom | Apple's cures, in order |
|---|---|
| Cursor does not move | Restart; check the mouse connection; if the mouse was on the keyboard, move it to the rear ADB port (if it works there, replace the keyboard; if not, the mouse); reseat, then replace, the logic board. |
| Cursor moves but the button does nothing | Replace the mouse; reseat, then replace, the logic board. |
| Cannot double-click to open anything | Remove extra System files; check the mouse speed setting; unplug the battery for 20 seconds, plug it back in and restart; check the mouse on the rear ADB port as above; replace the logic board. |
| No response from the keyboard | Check system software is 7.5 or later; check the ADB connection; replace the keyboard; reseat, then replace, the logic board. |
| Known-good StyleWriter or ImageWriter does not print | Check the Chooser and control panel; check the driver and system are not corrupt; check system software is 7.5 or later; check the printer's DIP switches; replace the printer cable; replace the logic board. |
| Known-good LaserWriter does not print | Check the Chooser and control panel; check the driver and system; replace the printer cables. |
| SCSI device not recognised | Check termination; check the SCSI cable; check the device manual for any software it needs. |
Source: pp. 67–69.[1]
Miscellaneous
[edit | edit source]| Symptom | Apple's cures, in order |
|---|---|
| Clicking, chirping or thumping sound | Replace the analogue board; replace the logic board. |
| Smoke or smell | Replace the analogue board; replace the power supply; replace the logic board. |
| No video, no audio and no drive activity | Connect the power cord; switch on; replace the power cord; replace the analogue board; replace the logic board. |
| Sad Macintosh icon with black vertical lines and a screeching sound | Replace the SIMMs; replace the logic board. |
| Sad Macintosh icon | Check there is no disc in the CD-ROM drive; disconnect external SCSI devices and restart; disconnect the internal SCSI device and start from a known-good floppy; replace the SCSI drive; replace the SIMMs; replace the logic board. |
| Rattling at startup with the Apple External Video Connector fitted | Press or fold the external video cable so that it cannot touch the fan blades. |
| Headphone jack does not work properly | Check the jack is seated; replace the front panel control board; replace the chassis/wiring harness. |
| Internal modem fitted; graphics or Ethernet card in the communications slot not recognised | Replace the modem; replace the graphics or Ethernet card. |
Source: pp. 70–73.[1]
Beyond module level
[edit | edit source]Apple's manual is module-level. It names P601, U5, D1 and U12 in the charts above and has no schematic or component values, so a fault inside a board has to be traced on the bench. See Power Macintosh 5260 Capacitor Replacement Guide and Capacitor Failure Symptoms.
Related pages
[edit | edit source]- Power Macintosh 5260
- Power Macintosh 5260 Specifications
- Power Macintosh 5260 General Maintenance
- Power Macintosh 5260 Capacitor Replacement Guide
- Power Macintosh/Performa 5260, 5280 Series Service Source