Atari SC1435
| Atari SC1435 | |
|---|---|
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|
| Front and rear of the SC1435, from its service manual | |
| Manufacturer | Atari Corporation; built by Philips[1] |
| Type | 14-inch RGB colour monitor with stereo speakers |
| Release date | Shown 12 November 1990 (Fall COMDEX); on sale from October 1990[1] |
| Discontinued | 1993[1] |
| Price | US$399 (November 1990)[1] |
| Interface | 9-pin D input (RGB analogue or TTL, separate or composite sync); two audio inputs; headphone socket |
| Compatible | Atari ST range except the ST Book; stereo sound from the STE and Falcon030; Falcon030 with an adapter[1] |
| Dimensions | 352 × 326 × 376 mm (W × H × D)[1] |
| Weight | 11 kg[1] |
| Power | 220-240 V or 110-120 V AC, 75 W[2] |
| Resolution | 640 × 200 (ST medium resolution)[1] |
The Atari SC1435 is a 14-inch colour monitor that Atari sold for the ST range from late 1990. Philips built it, and atari-computermuseum.de describes it as based on the Philips CM8833-II and as the only ST colour monitor with stereo sound, which the STE and Falcon030 can use.[1] It replaced the 12-inch Atari SC1224.[3] Its service manual is a Philips-format manual titled "14" CGA Colour monitor SC1435".[4]
The monitor has a colour CRT with a 25 kV anode supply and a mains-connected switch-mode power supply. Read CRT Discharge Procedure before opening the case.[2]
Specifications
[edit | edit source]| Item | Value |
|---|---|
| Mains | 220-240 V ±10 %, 50 Hz; USA model 110-120 V ±10 %, 60 Hz |
| Power consumption | 75 W |
| Picture tube | 14 in, 90° deflection, M34EAQ10X, slot triplet pitch 0.42 mm |
| Anode voltage | 25 kV |
| Horizontal frequency | 15,625 Hz ±600 Hz; USA model 15,734 Hz ±600 Hz |
| Vertical frequency | 50 Hz (47 to 62.5 Hz); USA model 60 Hz |
| Video bandwidth | 6.5 MHz |
| Characters | 2000 |
| Audio | Two loudspeakers, 16 Ω, 1 W, 3 in; output 1 W |
The European and USA models differ in the power supply and in a few parts; the service manual gives separate power supply diagrams for 110 V and 220 V and lists the parts that differ.[5][6]
Inputs and controls
[edit | edit source]The video input is a 9-pin D connector. atari-computermuseum.de lists the ST cable as a 9-pin D to 13-pin DIN lead.[1]
| Pin | Signal | Level | Impedance |
|---|---|---|---|
| 1, 2 | Ground | ||
| 3, 4, 5 | Red, green, blue | Linear 0.7 V, or TTL (low 0 to 0.8 V, high 2.4 to 5 V) | 75 Ω |
| 6 | Intensity | TTL | 75 Ω |
| 7 | Composite sync | 0.3 to 0.5 V | |
| 8 | Horizontal sync | TTL | 75 Ω |
| 9 | Vertical sync | TTL, same polarity as horizontal |
The two audio inputs, BU4 (right) and BU5 (left), take 177 mV rms into 10 kΩ, and the headphone socket gives 2.1 V rms into 32 Ω.[2] The front panel has the headphone socket, the GREEN switch (green-screen display), and the volume, contrast, brightness and horizontal centring controls. The rear has the mains switch and socket, the vertical centring, picture height and picture width presets, the 9-pin D input and the two audio inputs.[4][7]
Hardware
[edit | edit source]The SC1435 has a main panel and a CRT panel.[5] The power supply is a switch-mode design on the main panel: a pulse-width regulator (7421) drives the switching transistor 7432 on the primary of the power transformer 5401, an optocoupler (7401) carries the feedback from the secondary side, and a thyristor (7452) provides X-ray protection. The secondaries give the main line, marked 129 V on the diagram and set to 128 V with preset 3414, a 15 V line and a 12 V stabiliser (7450).[6][7] The primary side is marked "hot ground" on the diagram and "life part" on the board layout.[6][8] The mains fuse 1401 is T2A on the 220 V model and T3A on the 110 V model.[5] The RGB processing uses a TDA3505 video processor.[9]
Related monitors
[edit | edit source]Sources agree that the SC1435 is a Philips design shared with other brands but name different models. atari-computermuseum.de says it is based on the Philips CM8833-II; AtariForumWiki calls it "virtually identical to Commodore 1084 & Philips CM8833-II"; Wikipedia's ST article calls it a rebadged Magnavox 1CM135.[1][10][3]
Known faults
[edit | edit source]An owner who replaced all the electrolytic capacitors in an SC1435 reported a clear improvement in picture sharpness, and warned that one capacitor is non-polarised and must be replaced with a non-polarised part.[11] See Atari SC1435 Capacitor Replacement Guide and Atari SC1435 General Maintenance.
Documentation
[edit | edit source]- Atari SC1435 Documentation: the Philips-format service manual (4822 727 18351), with the parts lists, adjustments and circuit diagrams for the 110 V and 220 V models.
Related pages
[edit | edit source]- Atari SC1435 General Maintenance
- Atari SC1435 Capacitor Replacement Guide
- Atari SC1435 Documentation
- Atari SC1224, Atari SC1425, Atari PTC1426
- Atari 1040STE, Atari Mega STE
- CRT Discharge Procedure
References
[edit | edit source]- ↑ 1.00 1.01 1.02 1.03 1.04 1.05 1.06 1.07 1.08 1.09 1.10 "Atari SC1435 RGB Color Monitor", in "Atari ST-Peripheriegeräte", atari-computermuseum.de, https://www.atari-computermuseum.de/st_peri.htm#sc1435. Secondary source for the maker, the CM8833-II basis, dates, price, stereo sound, compatibility, cable, dimensions and weight.
- ↑ 2.0 2.1 2.2 2.3 2.4 SC1435 service manual, Technical data and input and output sockets, PDF p. 2 (CS 35 806).
- ↑ 3.0 3.1 "Atari ST", Wikipedia, section "Peripherals". https://en.wikipedia.org/wiki/Atari_ST
- ↑ 4.0 4.1 14" CGA Colour monitor SC1435 service manual, Consumer Electronics (Philips), 4822 727 18351, cover (CS 35 805). File:Atari SC1435 Service Manual.pdf.
- ↑ 5.0 5.1 5.2 SC1435 service manual, electrical parts lists for the CRT and main panels, PDF pp. 8-9.
- ↑ 6.0 6.1 6.2 SC1435 service manual, Power supply circuit diagram (on main panel), 110 V and 220 V, PDF pp. 25-29.
- ↑ 7.0 7.1 SC1435 service manual, Caution and Electrical adjustments, PDF p. 3 (CS 35 807).
- ↑ SC1435 service manual, Location of adjusting components, PDF p. 22 (CS 35 811).
- ↑ SC1435 service manual, Main circuit diagram (signal part), PDF pp. 30-34.
- ↑ "CRT Displays", AtariForumWiki (mirror at temlib.org), https://temlib.org/AtariForumWiki/index.php/CRT_Displays. Secondary source.
- ↑ "Atari SC1224", exxos's Atari, Amiga & retro forum, post by derkom, 21 May 2020. https://www.exxosforum.co.uk/forum/viewtopic.php?t=2803. Community report.