Editing Schneider DMP4000 Service Manual

The '''''Kundendienst-Handbuch / Service Manual DMP 4000''''' is Schneider Computer Division's service manual for the DMP 4000 wide-carriage dot-matrix printer — the DACH-region badge of the Amstrad DMP4000. '''Ident-Nr. 33984'''; the footer code is '''HDS 60964/2500/16/87''', dating it to '''1987'''. '''14 pages''', German and English in parallel, with a text layer.

Amstrad's own [[Amstrad DMP2000 / DMP3000 / DMP4000 Service Manual|combined manual]] treats the DMP4000 as an eight-page appendix. '''This one is a dedicated DMP4000 manual with its own complete electrical parts list''', and is the better source for the machine.

== Contents ==
* p. 1 — cover · p. 2 — '''cabinet parts list''' · p. 3 — cabinet drawing
* p. 4 — '''mechanism parts list''' (print head 37 665 00-501, gears, springs, cable drives, tractors, carriage, platen)
* p. 6–7 — '''circuit diagram''' · p. 8 — control PCB · p. 9 — '''main PCB''' · p. 10 — '''wiring diagram''' · p. 11 — AC PCB and control PCB, with the mains-side safety warning
* p. 12 — '''Electrical parts list: ICs, transistors, diodes and resistors'''
* p. 13 — '''Capacitors, switches and miscellaneous''' including the fuses
* p. 14 — '''Technische Daten''', '''DIP-switch table''' and the '''Centronics interface pinout'''

== The parts that matter on the bench ==
<templatestyles src="Template:StyledTable/styles.css" />
{| class="wikitable styled-table"
|-
! Ref !! Part !! Schneider part no.
|-
| '''F1''' || '''fuse T5A / 250 V''' || 124A0001-5000
|-
| '''F2''' || '''fuse T3.15 / 250 V''' || 124A0001-3150
|-
| '''F3''' || '''fuse T1A / 250 V''' || 124A0001-1000
|-
| C101, C104 || 0.047 µF / 250 V metallised film || 102A0008-4725
|-
| LF1 || mains filter choke, '''1.3 mH''' || 108A1000-0001
|-
| X1 || '''11 MHz ceramic resonator''' || 111A0002-1160
|-
| DSW1 || 8-way DIP switch || 107A0010-0801
|-
| DSW2 || 10-way DIP switch || 107A0010-1001
|-
| SW1–SW4 || tact switches || 107A0011-0112
|-
| BZ1 || piezo bleeper || 114A0091-0001
|-
| CN9 || 36-way Centronics socket || 109A0006-3603
|-
| PT1 || photo-interrupter '''SPI 216''' || P88010
|-
| — || '''HP (home position) sensor assembly''' || SP1300A56
|-
| — || '''PE (paper end) sensor assembly''' || SP1300A67
|-
| '''IC1''' || '''7805''' voltage regulator || 106A0003-7805
|-
| '''IC12''' || '''µPD7811''' — the printer's CPU || 106A0000-7811
|-
| IC9 || 256K EPROM, 250 ns || 106A0001-2756
|-
| IC11 || 6264-15 SRAM || 106A0001-6264
|-
| BR1, BR2 || bridge rectifiers '''RS403L''' || 104A1003-0410
|-
| D1, D5 || 1N6275 15 V transient suppressor || 104A2012-6275
|-
| D8 || RD15 1 W zener || 104A2001-1150
|-
| D35, D36 || RD47 1.5 W zener || 104A2001-2470
|-
| TR3 || 2SD1196 || 105A0204-1196
|-
| TR10 || 2SA1423 || 105A0101-1423
|-
| R77, R78 || 7.5 Ω 3 W || 101A0006-0751
|}

'''The DMP4000 has three fuses''' — T5A, T3.15A and T1A, all 250 V, all slow-blow. That is worth knowing before condemning a board: the DMP3000 has a different arrangement, and a dead wide-carriage machine is often one of these three.

'''The capacitor list in this manual is short by design.''' Only C101 and C104 appear, both 0.047 µF 250 V film parts on the mains side. The electrolytics are not itemised in this document — if you are recapping a DMP4000, this manual will not give you their values, and this wiki has no other source that does.

== Technical data, as printed ==
<templatestyles src="Template:StyledTable/styles.css" />
{| class="wikitable styled-table"
|-
! Item !! Value
|-
| Print system || Impact dot-matrix wire printer
|-
| Speed || '''200 cps''' normal
|-
| Character matrix || ASCII table 1: 9 × 9; table 2: 18 × 9; special characters tables 3.1/3.2: 12 × 11 and 4.1/4.2: 24 × 11
|-
| Character sets || 96 ASCII, 96 italic, 96 NLQ, 96 NLQ italic, 9 international sets, 132 special characters including IBM graphics
|-
| Columns || '''136''' standard (10 cpi), 163 elite (12 cpi), '''233''' condensed (17 cpi)
|-
| Line feed || 1/6, 1/8, 7/72 in, n/72 and n/216 in programmable; 1/6 in in 0.1 s
|-
| Paper || Continuous 7.5–42 cm wide; single sheet 8–39.5 cm wide
|-
| Interface || Parallel, Centronics-compatible
|-
| Mains || '''220–240 V, 50 Hz'''
|-
| Size and weight || 60 × 35 × 14 cm; '''9.5 kg'''
|}

As on the DMP3000, the Centronics port sources '''+5 V at 50 mA maximum'''.

== What it does not contain ==
No fault-symptom table, no adjustment or alignment procedure, and — importantly — '''no list of the electrolytic capacitors'''.

== Related pages ==
* [[Schneider DMP3000 Service Manual]] — the narrow-carriage machine, with a full capacitor list
* [[Amstrad DMP2000 / DMP3000 / DMP4000 Service Manual]] · [[Amstrad DMP1 Printer Service Manual]] · [[Amstrad LQ3500 Printer Service Manual]]
* [[Schneider NLQ-401 Service Manual]] · [[Capacitor Failure Symptoms]]

<pdf> File:Schneider DMP4000 Service Manual.pdf </pdf>

Download the Schneider DMP4000 Service Manual here: [[:File:Schneider DMP4000 Service Manual.pdf|Schneider DMP4000 Service Manual.pdf]] (2.8 MB)

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