Amstrad DMP1 Printer Service Manual: Difference between revisions

Latest revision as of 08:53, 1 October 2026

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.

[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

**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 mm or less in total
Paper width	4.5 to 10 inches
Power	220/240 V AC ±10%, 50 Hz
Consumption	25 W printing, 10 W standby
Operating temperature	5 to 40 °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 V at 80 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 µF / 50 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.

@@ Line 1: / Line 1: @@
-The '''DMP1 Printer Service Manual''' is Amstrad Consumer Electronics plc's own service manual for the DMP1 dot-matrix printer, 24 pages, cover price '''£5.00'''. It carries a text layer and is searchable.
+<templatestyles src="Template:StyledTable/styles.css" />
+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 ==
-Amstrad's numbered sections:
+The manual has no contents page. Its numbered sections, by page of the PDF:
-* '''[1] Specifications''' — print specifications and environment
+* [1] Specifications – 2
-* '''[2] Interface''' — input connector and signal pinout, and the interface timing
+* [2] Interface: input connector and signal pinout – 3
-* Line feed flowchart
+* [3] Block diagram – 4
-* '''[5] Timing diagram''' — initialisation sequence, start of printing, carrier return operation
+* Print and line feed flowcharts – 5, 6
-* '''Control PCB pattern''' — soldering side and component side
+* [5] Timing diagrams: initialisation, start of printing, carrier return – 7–9
-* '''Parts list''' and '''[12] exploded view'''
+* [6] Circuitry: circuit diagram of the control PCB – 10
-* Wiring, PCB and harness colour diagrams
+* Control PCB pattern, soldering side and component side – 11
-* '''[9] Cautions'''
+* Parts list – 12
-* '''[10] Troubleshooting''' — symptom, possible cause and remedy, keyed to the exploded-view reference numbers
+* [12] Exploded view – 13, 14
-* '''[12] Adjustments''' — including the '''dot sensor unit adjustment''' and the '''print head position adjustment'''
+* Wiring and harness colour diagram – 15
-* '''Electrical parts list''' — 22
+* [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
-== What it settles ==
+== Specification ==
-'''Print and environmental specification''', from section [1]:
+{| class="wikitable styled-table" style="width:75%; text-align:left;"
+|+'''Amstrad DMP1 specification (section [1])'''
-<templatestyles src="Template:StyledTable/styles.css" />
-{| class="wikitable styled-table" style="width:75%;"
-|+'''Amstrad DMP1'''
 ! Item !! Amstrad's figure
 |-
@@ Line 32: / Line 33: @@
 | Character matrix || 5 wide × 7 high, plus 1 space
 |-
-| Dot spacing || 1/60&nbsp;inch horizontal × 1/63&nbsp;inch vertical
+| Characters || 139 upper and lower case characters, numerals and symbols
+|-
+| Dot spacing || 1/60 inch horizontal × 1/63 inch vertical
 |-
-| Character pitch / columns || 10 characters per inch, 80 columns (480 dot columns) per line
+| Pitch and columns || 10 characters per inch, 80 columns (480 dot columns) per line
 |-
-| Print speed || 50&nbsp;cps
+| Print speed || 50 cps
 |-
-| Line feed || 6 or 9 lines per inch; 10 lines/s at 6&nbsp;lpi, 15 lines/s at 9&nbsp;lpi
+| Line feed || 6 or 9 lines per inch; 10 lines/s at 6 lpi, 15 lines/s at 9 lpi
 |-
-| Multiple copies || two including the original, 0.15&nbsp;mm total thickness or less
+| Copies || Two including the original, 0.15&nbsp;mm or less in total
 |-
-| Paper width || 4.5 to 10&nbsp;inches
+| Paper width || 4.5 to 10 inches
 |-
-| '''Power''' || '''220/240&nbsp;V AC ±10&nbsp;%, 50&nbsp;Hz'''
+| Power || 220/240&nbsp;V AC ±10%, 50&nbsp;Hz
 |-
-| '''Consumption''' || '''25&nbsp;W printing, 10&nbsp;W standby'''
+| Consumption || 25&nbsp;W printing, 10&nbsp;W standby
 |-
-| Temperature || 5 to 40&nbsp;°C
+| Operating temperature || 5 to 40&nbsp;°C
 |-
-| Humidity || 20 to 80&nbsp;%, non-condensing
+| Humidity || 20 to 80%, no condensation
 |}
-The interface is a '''DDK 36-pin bail-lock connector, type 57LE-40360-270B-D3''', with the full Centronics-style pinout printed.
+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 this manual does not contain ==
+== 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 electrical parts list is not a full bill of materials.''' Page 22 lists the ICs by type and part number (74LS04, 74LS374, 74LS32, 74LS373, HM6116P-4, ULN2003, the MBL8039 CPU, the MBM2732 ROM, 7404, 74LS74, the MBL8243 I/O and the GP-DR-2 driver), the transistors and the '''µA7805UC regulator''', the diodes and bridge rectifier, the ceramic oscillator, the DIP switch, four resistor arrays and two power resistors — and then '''only two capacitors, both 3300&nbsp;µF / 50&nbsp;V''' (parts 170712 and 170713). '''No other capacitor values are published.''' Anything else on this board has to be read off the part itself.
+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.
-* '''No circuit diagram with component designators''' — the PCB pattern drawings show the tracks and component outlines, not a schematic with values.
-* '''No print head part number''' or head replacement procedure beyond the position adjustment.
-* Nothing on the DMP2000, DMP3000, DMP4000 or LQ3500.
-<pdf> File:Amstrad DMP1 Printer Service Manual.pdf </pdf>
+== What this manual does not contain ==
-Download here: [[:File:Amstrad DMP1 Printer Service Manual.pdf|Amstrad DMP1 Printer Service Manual.pdf]]
+* 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 printer manuals: [[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]]

Josh (talk | contribs)

Latest revision as of 08:53, 1 October 2026

Contents

Specification

What it covers

What this manual does not contain

Related pages