Editing Amstrad DMP1 Printer Service Manual

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The '''DMP1 Printer Service Manual''' is Amstrad Consumer Electronics plc's service manual for the DMP1 dot-matrix printer. It has 24 pages, a cover price of £5.00 and a text layer. The DMP1 uses a Seikosha uni-hammer mechanism.

== Contents ==

The manual has no contents page. Its numbered sections, by page of the PDF:

* [1] Specifications – 2
* [2] Interface: input connector and signal pinout – 3
* [3] Block diagram – 4
* Print and line feed flowcharts – 5, 6
* [5] Timing diagrams: initialisation, start of printing, carrier return – 7–9
* [6] Circuitry: circuit diagram of the control PCB – 10
* Control PCB pattern, soldering side and component side – 11
* Parts list – 12
* [12] Exploded view – 13, 14
* Wiring and harness colour diagram – 15
* [9] Cautions – 16
* [10] Troubleshooting: seven symptoms with possible causes and solutions – 17, 18
* [12] Adjustments: timing belt installation, dot sensor unit adjustment, print head position adjustment – 19–21
* Electrical parts list – 22

== Specification ==

{| class="wikitable styled-table" style="width:75%; text-align:left;"
|+'''Amstrad DMP1 specification (section [1])'''
! Item !! Amstrad's figure
|-
| Print method || Impact dot matrix, Seikosha uni-hammer
|-
| Print direction || Unidirectional, left to right
|-
| Character matrix || 5 wide × 7 high, plus 1 space
|-
| Characters || 139 upper and lower case characters, numerals and symbols
|-
| Dot spacing || 1/60 inch horizontal × 1/63 inch vertical
|-
| Pitch and columns || 10 characters per inch, 80 columns (480 dot columns) per line
|-
| Print speed || 50 cps
|-
| Line feed || 6 or 9 lines per inch; 10 lines/s at 6 lpi, 15 lines/s at 9 lpi
|-
| Copies || Two including the original, 0.15&nbsp;mm or less in total
|-
| Paper width || 4.5 to 10 inches
|-
| Power || 220/240&nbsp;V AC ±10%, 50&nbsp;Hz
|-
| Consumption || 25&nbsp;W printing, 10&nbsp;W standby
|-
| Operating temperature || 5 to 40&nbsp;°C
|-
| Humidity || 20 to 80%, no condensation
|}

The interface (section [2]) is a DDK 36-pin bail-lock connector, type 57LE-40360-270B-D3, with a Centronics-style pinout; pin 18 supplies +5&nbsp;V at 80&nbsp;mA maximum.

== What it covers ==

The circuit diagram of the control PCB on page 10 carries component designators and values, with resistors in ohms and capacitors in µF unless marked otherwise. The electrical parts list on page 22 gives part numbers for the ICs (including the MBL8039 CPU, the MBM2732 ROM, the HM6116P-4 RAM, the MBL8243 I/O expander and the GP-DR-2 driver), the µA7805UC regulator, the transistors and diodes, the S2VB10 bridge rectifier, the ceramic resonator, the resistor arrays and the two 3300&nbsp;µF / 50&nbsp;V capacitors (parts 170712 and 170713). The mechanical parts list on page 12 includes the print head unit (170621), the timing belt (170626) and the head PCB assembly (170631).

The troubleshooting section works through seven symptoms, from a power lamp that does not light to a self test that does not run, with each cause keyed to the exploded-view reference numbers.

== What this manual does not contain ==

* Electrical parts list entries for the small capacitors and resistors. Their values are on the circuit diagram only.
* The DMP2000, DMP3000, DMP4000 or LQ3500, which have their own manuals.

== Related pages ==

* [[Amstrad DMP2000 / DMP3000 / DMP4000 Service Manual]] · [[Amstrad DMP2000 Printer Service Manual (standalone)]] · [[Amstrad LQ3500 Printer Service Manual]]
* Schneider-badged manuals for the same printer range: [[Schneider DMP3000 Service Manual]], [[Schneider DMP4000 Service Manual]], [[Schneider NLQ-401 Service Manual]]

<pdf> File:Amstrad DMP1 Printer Service Manual.pdf </pdf>

Download: [[:File:Amstrad DMP1 Printer Service Manual.pdf|Amstrad DMP1 Printer Service Manual.pdf]]

[[Category:Amstrad Service Manuals]]
[[Category:Service Manuals]]