Data General 6662 Manuale dell'operatore

Installing the 3–1/2 Inch Disk Drive:

Models 6662, 6796 and 6799



Printed in the United States of America

Rev. 04, November, 1992

Ordering No. 014–002139 014–002139–04

Notice

DATA GENERAL CORPORATION (DGC) HAS PREPARED THIS DOCUMENT FOR USE BY DGC PERSONNEL,

CUSTOMERS, AND PROSPECTIVE CUSTOMERS. THE INFORMATION CONTAINED HEREIN SHALL NOT BE

REPRODUCED IN WHOLE OR IN PART WITHOUT DGC’S PRIOR WRITTEN APPROVAL.

DGCreservestherighttomakechangesinspecificationsandotherinformationcontainedinthisdocumentwithoutprior

notice, and the reader should in all cases consult DGC to determine whether any such changes have been made.

THE TERMS AND CONDITIONS GOVERNING THE SALE OF DGC HARDWARE PRODUCTS AND THE

LICENSING OF DGC SOFTWARE CONSIST SOLELY OF THOSE SET FORTH IN THE WRITTEN CONTRACTS

BETWEEN DGC AND ITS CUSTOMERS. NO REPRESENTATION OR OTHER AFFIRMATION OF FACT

CONTAINEDIN THISDOCUMENTINCLUDINGBUTNOTLIMITEDTOSTATEMENTSREGARDINGCAPACITY,

RESPONSE–TIME PERFORMANCE, SUITABILITY FOR USE OR PERFORMANCE OF PRODUCTS DESCRIBED

HEREIN SHALL BE DEEMED TO BE A WARRANTY BY DGC FOR ANY PURPOSE, OR GIVE RISE TO ANY

LIABILITY OF DGC WHATSOEVER.

IN NO EVENT SHALL DGC BE LIABLE FOR ANY INCIDENTAL, INDIRECT, SPECIAL OR CONSEQUENTIAL

DAMAGESWHATSOEVER(INCLUDINGBUTNOTLIMITEDTOLOSTPROFITS)ARISINGOUTOFOR RELATED

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Installing the 3–1/2 Inch Disk Drive: Models 6662, 6796 and 6799

014–002139–04

Original Release - Januar 1992

First Revision - March 1992

Second Revision - Ma 1992

Third Revision - August 1992

Fourth Revision - November 1992

A vertical bar in the margin of a page indicates substantive technical change from the

previous revision.

NOTE

This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to Part 15 of

the FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a

residential installation. This equipment generates, uses and can radiate radio frequency energy and, if not installed

and used in accordance with the instructions, may cause harmful interference to radio communications. However,

there is no guarantee that interference will not occur in a particular installation. If this equipment does cause harmful

interference to radio or television reception, which can be determined by turning the equipment off and on, the user is

encouraged to try to correct the interference by one or more of the following measures:

•Reorient or relocate the receiving antenna.

•Increase the separation between the equipment and receiver.

•Connect the equipment into an outlet on a circuit different from that to which the receiver is connected.

•Consult the dealer or an experienced radio/TV technician for help.

WARNING

Changes or modifications to this unit not expressly approved by the party responsible for complicance could void the

user’s authority to operate the equipment.

This device complies with Part 15 of the FCC rules. Operation is subject to the following two conditions:

(1) this device may not cause harmful interference, and (2) this device must accept any interference received, including

interference that may cause undesired operation. Testing was done with shielded cables. Therefore, in order to comply

with the FCC regulations, you must use shielded cables with your installation.

This digital apparatus does not exceed the Class B limits for radio noise emissions from digital apparatus set out in the

Radio Interference Regulations of the Canadian Department of Communications.

Le présent appareil numérique n’ émet pas de bruits radioélectriques dépassant les limites applicables aux appareils

numériques de la classe B prescrites dans le Règlement sur le brouillage radioélectrique édicté par le ministère des

Communications du Canada.

Dieses Gerät ist funkentstört nach VDE 0871 Grenzwertklasse B und entspricht den technischen Vorschriften der

DBP–Verfügung 1046/1984.

014–002139 v

About This Manual

This manual explains h w t install the M dels 6662 and 6796 (single-ended) and

6799 (differential) disk drives. Bef re y u begin, find the setting up, expanding, r

maintaining manual f r the c mputer system in which y u will install the drive. If

y u are installing the drive in a mass-st rage subsystem, y u need the c mputer

manual and als a c py f the mass-st rage subsystem's installati n and maintaining

manual. During the installati n pr cedure, y u must refer t the drive-m unting

instructi ns c ntained in the c mputer system manual.

Occasi nally, y u may need t refer t the perating instructi ns f r the disk drive.

We suggest that y u place this drive manual in the back f the binder that c ntains the

manual f r y ur c mputer.

Telephone Assistance

If you are unable to solve a problem using any manual you received with your

system, free telephone assistance is available with your hardware warranty and

with most Data General software service options. If you are within the United

States or Canada, contact the Data General Customer Support Center (CSC) by

calling 1–800–DG–HELPS. Lines are open from 8:00 a.m. to 5:00 p.m., your time,

Monday through Friday. The center will put you in touch with a member of

Data General’s telephone assistance staff who can answer your questions.

For telephone assistance outside the United States or Canada, ask your Data

General sales representative for the appropriate telephone number.

Avoiding Electrostatic Discharge (ESD)

Damage

The cover(s) and filler panel(s) installed on your equipment protect the electronic

circuits inside the equipment from electrostatic discharge (ESD) damage. However,

when you remove these covers and filler panels to replace or install subassemblies,

you can inadvertently damage the sensitive electronic circuits in the equipment by

simply touching them. Electrostatic charge that has accumulated on your body

discharges through the circuits. If the air in the work area is very dry, running a

humidifier in the work area will help decrease the risk of ESD damage. You must

follow the procedures below to prevent damage to the equipment.

CAUTION: Read and understand the following instructions before you remove the

cover(s) or panel(s) from the equipment.

•Provide enough room to work on the equipment. Clear the work site of any

unnecessary materials or materials that naturally build up electrostatic charge,

such as foam packaging, foam cups, cellophane wrappers, and similar materials.

About This Manual

014–002139

•Do not remove replacement or upgrade subassemblies from their antistatic

packaging until the exact moment that you are ready to install them.

•Gather the tools, manuals, an ESD kit, and all other materials you will need

before you remove covers and panels from the equipment. Procedures for

removing subassemblies usually list required materials at the beginning. After

you remove a cover or panel, you should avoid moving away from the work site;

otherwise, you may build up an electrostatic charge.

•Use an ESD kit when handling circuit boards or when touching the electronic

circuits inside the equipment. If you don’t have an ESD kit, you can order one

from Data General. If an emergency arises and an ESD kit is not available,

follow the procedures in the “Emergency Procedures (without an ESD kit)”

section.

•Replace the cover(s) or panel(s) on the equipment as soon as possible so that the

electronic circuits are protected.

•If the equipment has an opening for an optional device (such as a mass–storage

drive), and the device is not installed, make sure a filler panel is installed in the

opening before connecting the equipment to the ac power outlet.

Emergency Procedures (without an ESD kit)

In an emergency when an ESD kit is not available, use the following procedures to

reduce the possibility of an electrostatic discharge by ensuring that your body and

the subassembly are at the same electrostatic potential.

CAUTION: These procedures are not a substitute for the use of an ESD kit. Follow

them only in the event of an emergency.

•Before touching any electronic circuits or boards inside the equipment, firmly

touch a bare metal (unpainted) surface of the equipment.

•Before removing any replacement or upgrade subassembly from its antistatic

bag, place one hand firmly on a bare metal (unpainted) surface of the chassis,

and at the same time, pick up the replacement or upgrade subassembly while it

is still sealed in the antistatic bag. Once you have done this, do not move

around the room or contact other furnishings, personnel, or surfaces until you

have installed and secured the subassembly in the equipment.

•Remove the subassembly from the antistatic bag, handling printed circuit boards

by the edges. Avoid touching components and circuits on a printed circuit board.

•If you must move around the room or touch other surfaces before securing the

subassembly in the equipment, first place the subassembly back in the antistatic

bag. When you are ready again to install the subassembly repeat these

procedures.

•Order an ESD kit from Data General for the next time you need to add or

remove a cover or panel.

014–002139

Installing the Drive

This document explains how to install the Model 6662, 6796, and 6799 full-height

3Ć1/2 inch disk drive in a Data General computer system or mass-storage subsystem

that uses the small computer system interface (SCSI).

NOTE: This drive occupies a half-height slot.

Models 6662 and 6796 are singleĆended drives and Model 6799 is a differential drive.

NOTE: There are two versions of Model 6662 as shown in Figure 1. ersion A is

a 5Ć1/4 inch half-height drive and ersion B is a 3Ć1/2 inch full-height

drive. If you have Model 6662 ersion A, refer to the  

       (014Ć001940). This

document (014-002139) describes how to install and operate Model 6662

ersion B. There are two board layouts for Model 6662 ersion B as

shown in Figure 1.

Model 6662 Version B

3-1/2 inch full-height

332-Mbyte

Board Layout 2

Model 6662 Version A

5-1/4 inch half-height

332-Mbyte

Model 6662 Version B

3-1/2 inch full-height

332-Mbyte

Board Layout 1

Figure 1 Identifying Model 6662 Versions and Board Layouts

Table 1 highlights the specifications for the disk drive. Refer to the information in

this table as needed.

Installing the Drive

2014–002139

Table 1 Specifications for the Model 6662, 6796 and 6799 Disk Drive

Specification Model 6796 Model 6662

Model 6799

Unformatted capacity 609 Mbytes 498 Mbytes

Formatted capacity 520 Mbytes 339 Mbytes

Interface SCSI-2 SCSIĆ1, singleĆended

6796 = singleĆended

6799 = differential

Number of disk surfaces 11 7

Number of cylinders 1,429 1,780

Number of sectors 63.5 (average) 54

Bytes per sector 512 512

Current draw

+5V dc (+ 5%) Typical 1.0 A Typical 1.0 A

Maximum 1.0 A Maximum 1.0 A

+12V dc (+5%) Typical .75 A Typical .75 A

Maximum 2.5 A Maximum 2.5 A

ower dissipation

Idle Typical 11 watts Typical 11 watts

ositioning Maximum 14 watts Maximum 14 watts

NOTE: The environmental specifications for the disk drive meet or exceed those of the

Data General computer system in which you install this disk drive. Refer to your

computer system documentation for the environmental specifications.

The singleĆended and the differential drive have no operational differences between

them. The only functional difference is that the differential drive can use a much

longer SCSI cable and therefore, can be physically located further from the C U than

a singleĆended drive. For example, the maximum length of a singleĆended SCSI bus is

slightly less than 20 feet, while a differential SCSI bus can be 82 feet long. You can use

the singleĆended model as a terminator resistor in a daisyĆchain configuration, while

the differential model does not have this capability.

NOTE: Never install differential and singleĆended drives on the same SCSI bus.

The SCSI bus signals and terminators differ.

You can distinguish between the drives by their size, printedĆcircuit board layout, and

their 118 numbers. The 118 numbers are on a label on the bottom side (the side

without the printedĆcircuit board) of the drives. Figure 2 shows the single-ended and

differential models.

Installing the Drive

014–002139

Single–ended

Model 6662 Board Layout 2

(118-014069)

Model 6796 Board Layout 2

(118-011199)

Differential

Model 6799 (118-011414)

Single–ended

Model 6796 Board Layout 2

(118–015462)

Single–ended

Model 6662 Board Layout 1

(118-014069)

Model 6796 Board Layout 1

(118-011199)

Single–ended

Model 6796 Board Layout 1

(118–015462)

Figure 2 Single–Ended and Differential Disk Drives

Installing the Drive

4014–002139

Unpacking and Inspecting the Drive

Follow t e next steps to make sure your drive arrived undamaged and wit out missing

parts.

CAUTION: You can cause electrostatic discharge (ESD) damage to electronic

equipment by improper handling. For information about avoiding ESD

damage, refer to the section About This Manual."

1. Remove and set aside t e packing slip from t e outside of t e s ipping carton.

CAUTION: Handle your drive gently; do not drop or ar it. Make

sure you have a firm grip on it before you lift it, and lift it with both

hands.

2. Open t e cartons one by one and remove t e drive. As you do, carefully inspect

t e drive for any visible damage. If t e drive is damaged, contact Data General

as described in t e section About T is Manual."

3. Make sure t at t e model and part numbers on t e drive matc t e drive model

and part numbers on your packing slip. If you t ink you received t e wrong

drive, contact Data General as described in t e section About T is Manual."

4. Make sure t at you received a 3Ć1/2 inc to 5Ć1/4 inc conversion bracket. If you

did not receive t is bracket, contact Data General as described in t e section

About T is Manual."

Configuring the Model 6662 and 6796 Drive

T is section explains ow to set t e jumpers on t e Model 6662 and 6796 drives, and if

required, remove its terminator resistor pack. Figure 3 s ows t e location of t e

jumpers and terminator resistor pack on t e Model 6662 drive board layouts 1 and 2.

Figure 4 s ows t e location of t e jumpers and terminator resistor pack on t e Model

6796 (board layouts 1 and 2) drive board.

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