user manual

1-52 Computer Group Literature Center Web Site

Hardware Preparation and Installation

the 14-pin combined LED-mezzanine/remote-reset connector, J1. The FUS

LED (DS5) on the MVME2603/2604 front panel illuminates when all

three voltages are available.

In MVME712M I/O mode, the MVME2603/2604 supplies SCSI

terminator power through a 1A fuse (F1) located on the P2 adapter board.

If the fuse is blown, the SCSI device(s) may function erratically or not at

all. With the P2 adapter board cabled to a transition module and with an

SCSI bus connected to the transition module, the green

SCSI LED on the

module illuminates when SCSI terminator power is available. If the

SCSI

LED on the transition module flickers during SCSI bus operation, check

fuse F1 on the P2 adapter board.

Note Because any device on the SCSI bus can provide the

TERMPWR

signal, and because the MVME2603/2604

FUS LED monitors the

status of several voltages, the LED does not directly indicate the

condition of any single fuse. If the

FUS LED flickers or goes out,

check all the fuses (polyswitches).

In MVME761 I/O mode, the MVME2603/2604 supplies SCSI terminator

power through a polyswitch (resettable fuse) located on the P2 adapter

board.

The MVME2603/2604 base board supplies a

SPEAKER_OUT signal to the

14-pin combined LED-mezzanine/remote-reset connector, J1. When J1 is

used as a remote reset connector with the LED mezzanine removed, the

SPEAKER_OUT signal can be cabled to an external speaker. For the pin

assignments of J1, refer to Table 4-1 on page 4-3.

On the MVME2603/2604 base board, the standard serial console port

(

COM1) serves as the PPCBug debugger console port. The firmware

console should be set up as follows:

❏ Eight bits per character

❏ One stop bit per character

❏ Parity disabled (no parity)

❏ Baud rate of 9600 baud