Maintenance & Service Guide

Presario Series

Models: 1246, 1247, 1277, 1278, and 1279

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Connector Pin Assignments

This section provides connector pin assignment tables for Compaq Presario Series Portable Computers.

For more information on connectors, refer to the section on Rear Connectors.

NOTE: The signals in all tables of this appendix are considered active high unless otherwise indicated by

an asterisk (*).

Parallel Connector

Pin

Signal

Pin

Signal

1

Strobe*

10

Acknowledge*

2

Data Bit 0

11

Busy

3

Data Bit 1

12

Paper Out

4

Data Bit 2

13

Select

5

Data Bit 3

14

Auto Linefeed*

6

Data Bit 4

15

Error*

7

Data Bit 5

16

Initialize Printer*

8

Data Bit 6

17

Select In*

9

Data Bit 7

18-25

Signal Ground

* = Active low

 

Serial Connector

Connector

Pin Signal

1 Carrier Detect

2 Receive Data

3 Transmit Data

4 Data Terminal Ready

5 Signal Ground

6 Data Set Ready

7 Ready to Send

8 Clear to Send

9 Ring Indicator

Keyboard/Mouse

Connector

Pin

Signal

 

1

Data 1

 

2

Data 2

 

3

Ground

 

4

+5 V

 

5

Clock 1

 

6

Clock 2

External VGA Monitor

Connector

Pin

Signal

 

1

Red Analog

 

2

Green Analog

 

3

Blue Analog

 

4

Not connected

 

5

Ground

 

6

Ground Analog

 

7

Ground Analog

 

8

Ground Analog

 

9

Not connected

 

10

Ground

 

11

Monitor Detect

 

12

DDC2B Data

 

13

Horizontal Sync

 

14

Vertical Sync

 

15

DDC2B Clock

Universal Serial Bus

Connector

Pin

Signal

 

1

+5V

 

2

Data -

 

 

Data +

3

4

Ground

 

Modem

 

Connector

Pin

Signal

 

1

Unused

 

2

Unused

 

3

Tip

 

4

Ring

 

5

Unused

 

6

Unused

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HP 1277, 1278 manual Connector Pin Assignments, Pin Signal

1278, 1277 specifications

The HP 1278 and 1277 are modern printers designed to meet the evolving needs of both home and office environments. These models feature advanced printing technologies that enhance efficiency while delivering high-quality prints.

One of the standout features of the HP 1278 and 1277 is their ability to produce vibrant, sharp images. Both models utilize HP's innovative Inkjet technology, which ensures precise ink placement for stunning photo prints and clear text documents. The printers support various media types, from standard paper to photo paper, catering to a wide range of printing needs.

Connectivity is a crucial aspect of modern printers, and HP has ensured that the 1278 and 1277 excel in this area. Both printers offer wireless printing capabilities, allowing users to print from smartphones, tablets, and laptops without the hassle of tangled cords. They support various connectivity options, including Wi-Fi Direct and mobile printing via the HP Smart app, which enhances user convenience.

Speed is another critical feature of the HP 1278 and 1277. These models are designed to handle high-volume printing tasks efficiently, boasting impressive print speeds that can significantly reduce waiting times for essential documents. The fast output does not come at the expense of quality; users can expect crisp and clear text, along with rich colors in all their prints.

In terms of user-friendliness, both models are equipped with intuitive control panels and clear LCD displays that make navigation easy. They also come with easy-to-install cartridges, enabling quick replacements, minimizing downtime, and maximizing productivity.

The HP 1278 and 1277 models also emphasize sustainability. HP has integrated EcoSmart technology into these printers, which helps reduce energy consumption and waste. Users can take advantage of HP Instant Ink, a subscription service that delivers ink cartridges to their door when supplies run low, promoting a more sustainable approach to printing.

Overall, the HP 1278 and 1277 are versatile printers that blend high performance with user-friendly features. Their combination of advanced technologies, connectivity options, speed, and quality make them ideal choices for anyone looking to enhance their printing experience, whether at home or in a professional setting. These models represent HP's commitment to delivering reliable and efficient printing solutions for diverse user needs.