Atari 800XE Capacitor Replacement Guide
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The Atari 800XE uses the 130XE's main board with 64 KB fitted. The JER/Eightbitter reproduction of the XE field service manual draws it as the two-DRAM version of assembly CA200519, with the title block "65XE/800XE (64X4) C103579-001", shared with the late Atari 65XE.[1][2] Its capacitors are therefore those of the 130XE, which has the full procedure.
Atari published no parts list under the 800XE name. The values, ratings and part numbers below are from Atari's 130XE parts list, whose designators match the reproduction's 800XE drawing.[3][1]
The supply
[edit | edit source]The 800XE takes +5 V DC from an external power pack through the 7-pin DIN socket J7 (Atari C061838). The board has the socket, the power switch S1 and filtering, and no rectifier or regulator; those are in the power pack (Atari C061982).[3][1] On the board the switched +5 V is distributed as +5A, +5B and +5C.[1]
Capacitor list
[edit | edit source]| Designators | Value | Rating | Type | Atari part number |
|---|---|---|---|---|
| C1 | 470 µF | 10 V | Electrolytic, radial | C014368 |
| C2, C3, C10, C79 | 22 µF | 16 V | Electrolytic, axial | C014393 |
| C24, C50, C98 | 10 µF | 16 V | Electrolytic, radial | C014392 |
| C19, C20, C22 | 4.7 µF | 35 V | Non-polarised electrolytic | C061647 |
That is eleven parts; the rest of the board is ceramic.[3] On Atari's 130XE schematic, C1 and C2 are across the +5 V from the power switch S1, feeding the +5A rail; C3 filters +5B and C10 filters +5C; C79 decouples the +5 V/ready line to SIO pin 10; C50 is on the +5A feed to the video buffer U20 (CD4050); C19, C20, C22 and C24 are in the audio circuit around the LM358 (U1); and C98 is on the +5 V feed to the controller jacks.[3]
C19, C20 and C22 are marked "NONPOLARIZED" in Atari's parts list and with an asterisk on the schematic.[3] Replace them with bipolar (non-polarised) parts.
The 4464 DRAMs are at U9 and U10 on the 800XE board; the U34 and U35 positions of the 130XE version of the artwork are part of the 128 KB bank-switching circuit, which the 800XE does not use.[1]
Procedure
[edit | edit source]Disassembly and replacement are the same as on the 130XE: four screws in the bottom cover, the keyboard connector, seven screws holding the shielded board, and seven tabs holding the shields together.[1] Follow the Atari 130XE Capacitor Replacement Guide, and measure the power pack and the 5 V at the positive end of C2 before replacing anything, as described there. Jason Moore reports that the original electrolytics in Atari 8-bit computers do not fail often, though some do.[4]
Related pages
[edit | edit source]- Atari 800XE
- Atari 800XE General Maintenance
- Atari 800XE Troubleshooting Guide
- Atari 65XE Capacitor Replacement Guide
- Atari 130XE Capacitor Replacement Guide
References
[edit | edit source]- ↑ 1.0 1.1 1.2 1.3 1.4 1.5 130XE Personal Computer Field Service Manual, reproduction by JER/Eightbitter (PDF author "Jurek"), November 2016, with schematics redrawn in May 2014; not an Atari publication. Section 2, figure 2-11 ("Schematic Atari 65XE/800XE 2 X 4464 Assembly CA200519") and figure 2-12 (layout). Hosted here as Atari 130XE Field Service Manual (PDF). Source of the designators on the 800XE board.
- ↑ Michael D. Current (ed.), Atari 8-Bit Computers: Frequently Asked Questions, comp.sys.atari.8bit FAQ, last modified 29 November 2009, section 1.9 "What is the Atari 800XE?". faqs.org. Community reference.
- ↑ 3.0 3.1 3.2 3.3 3.4 Atari (U.S.) Corp., 130XE Parts List, 25 June 1985, with Atari (Japan) schematic C070065 Rev. B (130XE NTSC/PAL). Hosted here as Atari 130XE Parts List and Production Test Instructions (PDF). Source of the values, voltage ratings, types, Atari part numbers and positions.
- ↑ Jason H. Moore, "Replace Faulty Capacitors on Your Atari 8-Bit Computer Circuit Board", Atari Projects, 6 October 2024: the capacitors in 1970s and early-1980s Atari 8-bit computers "don't seem to fail too often".