Amstrad DMP1 Printer Service Manual
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.
Contents
Amstrad's numbered sections:
- [1] Specifications — print specifications and environment
- [2] Interface — input connector and signal pinout, and the interface timing
- Line feed flowchart
- [5] Timing diagram — initialisation sequence, start of printing, carrier return operation
- Control PCB pattern — soldering side and component side
- Parts list and [12] exploded view
- Wiring, PCB and harness colour diagrams
- [9] Cautions
- [10] Troubleshooting — symptom, possible cause and remedy, keyed to the exploded-view reference numbers
- [12] Adjustments — including the dot sensor unit adjustment and the print head position adjustment
- Electrical parts list — 22
What it settles
Print and environmental specification, from 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 |
| Dot spacing | 1/60 inch horizontal × 1/63 inch vertical |
| Character pitch / 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 |
| Multiple copies | two including the original, 0.15 mm total thickness or less |
| Paper width | 4.5 to 10 inches |
| Power | 220/240 V AC ±10 %, 50 Hz |
| Consumption | 25 W printing, 10 W standby |
| Temperature | 5 to 40 °C |
| Humidity | 20 to 80 %, non-condensing |
The interface is a DDK 36-pin bail-lock connector, type 57LE-40360-270B-D3, with the full Centronics-style pinout printed.
What this manual does not contain
- 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 µF / 50 V (parts 170712 and 170713). No other capacitor values are published. Anything else on this board has to be read off the part itself.
- 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.
Download here: Amstrad DMP1 Printer Service Manual.pdf