jih@ox.com (John Hritz) (11/17/90)
I have a 3b2/400 that has crashed. Upon cold start, the power comes up and the diagnostic light blinks 5 times, pauses briefly and then repeats. The system never checks the floppy, so it is not possible to use the boot disk. Any info on what this diagnostic light sequence means would be helpful. Please reply to jih@ox.com.
eric@sactoh0.SAC.CA.US (Eric J. Nihill) (11/18/90)
In article <1990Nov17.040047.21053@ox.com> jih@ox.com (John Hritz) writes: > > I have a 3b2/400 that has crashed. Upon cold start, the power comes > up and the diagnostic light blinks 5 times, pauses briefly and then > repeats. The system never checks the floppy, so it is not possible > to use the boot disk. Any info on what this diagnostic light > sequence means would be helpful. > Display Possible Causes/Solution ----------------------------------------------------------------------- Red LED pulsing Unknown problem. The console may be wired 1 time. incorrectly or there may be other trouble not revealed by LED pulses. Investigate further using diagnostics and the powerup trouble shooting chart. Red LED pulsing Problem with CPU. 2 times. Red LED pulsing Problem with firmware (ROMS). 3 times. Red LED pulsing Problem with RAM. 4 times. Red LED pulsing Problem with the DUART. 5 times. Both Red and Green Reseat Mmemory boards, I/O Backplane. Remove LEDs on. feature cards. Try to reboot. Disconnect the battery and reconnect, then reboot. Swap first memory card. Green LED on, Red Check to see that the console is connected LED off after a correctly. It should have a Term/Printer short time. Adapter hooked hooked to the MODEM port. Terminals other than AT&T Teletype may not supply DTR as a positive 12 volts. Usa a RS-232-C breakout box to verify, or jumper pins 8 to 20 in the Term/Printer Adapter. Source of information: AT&T 3B2 Computer Maintenance Reference Manual, Issue 2. Tel #1-800-432-6600 -- Some do, some don't. | eric@sactoh0.SAC.CA.US Some will, some won't. | ames!pacbell!sactoh0!eric I might! | ucbvax!csusac!sactoh0!eric | U.S. Mail 95611-0785
friedl@mtndew.Tustin.CA.US (Stephen Friedl) (11/19/90)
In article <1990Nov17.040047.21053@ox.com>, jih@ox.com (John Hritz) writes: > > I have a 3b2/400 that has crashed. Upon cold start, the power comes > up and the diagnostic light blinks 5 times, pauses briefly and then > repeats. The system never checks the floppy, so it is not possible > to use the boot disk. Any info on what this diagnostic light > sequence means would be helpful. The diagnostic light will flash depending on the low-level error: amber light description ----------- ------------------ 1 flash unknown problem 2 flashes problem with CPU 3 flashes problem with ROM 4 flashes problem with RAM 5 flashes problem with DUART The DUART is the dual serial chip running console and contty, and it probably means that you have a bad cable or terminal. Steve -- Stephen J. Friedl, KA8CMY / 3B2-kind-of-guy / Tustin, CA / 3B2-kind-of-guy +1 714 544 6561 / friedl@mtndew.Tustin.CA.US / {uunet,attmail}!mtndew!friedl "Gcc compiles an interesting language which is not ANSI C." - Henry Spencer