Amstrad DMP3000 Maintenance Guide
The Amstrad DMP3000 shares its mechanism and main board with the Amstrad DMP2000, so the ribbon, self-test, mechanism and case procedures are on the Amstrad DMP2000 Maintenance Guide. The sections below cover what is specific to the DMP3000: its capacitors and fuses, its DIP switches, and the points where its user manual differs. Schneider's service manual for the Schneider DMP 3000 agrees with Amstrad's DMP2000/3000 parts list in most entries and gives the parts that Amstrad's list leaves out.[1][2]
Safety
[edit | edit source]Warning: the printer contains mains voltage. Unplug it before opening the case.
Parts with Amstrad's safety prefix (the power switch, mains transformer, mains filter coil and the 250 V capacitors C31 to C34) must be replaced with parts of identical safety specification, and the safety tests repeated after any work.[2] The DMP3000 user manual asks for a 3 A fuse in a 13 A plug and a 220–240 V 50 Hz supply.[3]
Before first use and after transport
[edit | edit source]The DMP3000 is packed with cardboard print head stabilisers, and its manual says not to switch on or run the printer with them in place, without the ribbon or without paper.[3] The ribbon is fitted in the same way as on the DMP2000: both ends into the two metal brackets at the rear, the upper ribbon under the grooved flap with the head lever raised, and the lower ribbon between the head and the small metal shield.[3]
Self test
[edit | edit source]Switch off, hold down LF, switch on and release LF. The printer prints the ASCII set until the paper runs out or it is switched off. With paper loaded, a normal start gives no paper-out alarm and lights the ON LINE lamp.[3]
Capacitors
[edit | edit source]Schneider's list (p. 10) gives every capacitor on the DMP3000 board; Amstrad's combined list omits C25 and misprints C28.[1][2] All the electrolytics are specified as 105 °C parts.
| Ref | Value | Schneider part no. |
|---|---|---|
| C25 | 4700 µF 30 V, 105 °C | 103A1002-4722 |
| C28 | 4700 µF 16 V, 105 °C | 103A1002-4721 |
| C26 | 47 µF 16 V, 105 °C | 103A1001-4703 |
| C4 | 1 µF 50 V, 105 °C | 103A1001-0107 |
The other capacitors are 0.1 µF 50 V monolithic ceramics (C1 to C3, C5, C6, C9, C10, C14 to C21, C23), the 0.047 µF 250 V film capacitors C31 and C34, and the safety capacitors C32 and C33, whose value Schneider prints as 0,0022 µF in German and 0.022 in English; Amstrad gives 0.0022 µF 250 V.[1][2] Read the value marked on the fitted part before replacing C32 or C33. The Amstrad DMP2000 Maintenance Guide compares the two lists in full. See Capacitor Failure Symptoms.
Fuses and power parts
[edit | edit source]| Ref | Part |
|---|---|
| F1 | T3.15 A 250 V fuse |
| F2 | T315 mA 250 V fuse |
| BD1 | S4VB10 bridge rectifier, 4 A 100 V |
| BD2 | S2VB10 bridge rectifier, 2 A 100 V |
| IC18 | L7805 regulator |
| D22, D23 | 27 V 1 W zener diodes (Amstrad's list gives D23 as the 27 V zener and includes D22 in the 1N4148 range) |
| R62, R63 | 100 Ω 2 W resistors |
| VR1 | 68 Ω semi-fixed resistor |
Amstrad's wiring diagram prints the fuse on the mains filter board as "250V/150mA", where Schneider lists F2 as T315 mA. Check the rating printed on the fitted fuse and the board.[2][1] Neither manual gives a setting procedure for VR1.
DIP switches
[edit | edit source]The switches are at the rear and should be changed only with the printer switched off. On the DMP3000, DS1-7 and DS1-8 select the default character set: both off for Epson FX standard, DS1-7 on for Epson FX NLQ, DS1-8 on for IBM set 1, and both on for IBM set 2. DS2-9 and DS2-10 are factory-set and should not be used.[3] Schneider's table marks DS2-9 and DS2-10 as having no function.[1] If a computer prints the wrong characters while the self test is correct, check DS1-1 to DS1-3 (international set) and DS1-7 and DS1-8 against the manual for the printer's own firmware.
Related pages
[edit | edit source]- Amstrad DMP3000 · Amstrad DMP2000 Maintenance Guide · Amstrad DMP2000
- Schneider DMP3000 Service Manual · Amstrad DMP2000 / DMP3000 / DMP4000 Service Manual · Amstrad DMP3000 User Manual
- Capacitor Failure Symptoms · Recommended Tools
References
[edit | edit source]- ↑ 1.0 1.1 1.2 1.3 1.4 Schneider, Kundendienst-Handbuch / Service Manual DMP 3000, Ident-Nr. 33 624, footer HDS 60259/1500/04/87. Described at Schneider DMP3000 Service Manual. Cabinet parts list p. 2; mechanism parts list p. 5; circuit diagram pp. 6–7; main PCB p. 9; electrical parts list p. 10; miscellaneous parts and fuses p. 11; technical data and DIP switches p. 12.
- ↑ 2.0 2.1 2.2 2.3 2.4 Amstrad plc, DMP2000 / DMP3000 / DMP4000 Printer Service Manual. Hosted as File:Amstrad DMP2000 DMP3000 DMP4000 Service Manual.pdf, described at Amstrad DMP2000 / DMP3000 / DMP4000 Service Manual. Safety note p. 2; cabinet parts list p. 4; wiring diagram p. 8; electrical parts list p. 12.
- ↑ 3.0 3.1 3.2 3.3 3.4 Amstrad plc, DMP3000 / DMP3160 / DMP3250DI PC Compatible Dot Matrix Printer user manual, © 1986, second edition 1987. Hosted as File:Amstrad DMP3000 DMP3160 DMP3250di User Manual.pdf, described at Amstrad DMP3000 User Manual. Introduction (safety notes); chapter 1 (mains plug, print head stabilisers, ribbon, self test); chapter 2 (character set switches); chapter 7 (DIP switch functions).