Atari 65XE Capacitor Replacement Guide
This is the electrolytic capacitor reference for the Atari 65XE. The 65XE was built on three different board assemblies and the capacitor list is not quite the same on all of them, so identify the board before you order parts.
The full recapping procedure, the power supply description and the verification steps are on the Atari 130XE Capacitor Replacement Guide — they are identical for every XE machine and are not repeated here.
Values and designators come from Atari's own schematics for each 65XE assembly.[1] Voltage ratings and Atari part numbers are taken from Atari's parts list for the 130XE board, which uses the same designators and the same part numbers in these positions.[2]
The supply
[edit | edit source]Like every XE machine the 65XE takes +5 V DC from an external brick through a 7-pin DIN (J7) — pins 1, 4 and 6 are +5 V, pins 3, 5 and 7 are ground, pin 2 is the shield.[1] There is no rectifier and no regulator on the motherboard; both are inside the brick, which is rated 5 V ±5 % at 1.5 A. See the 130XE guide for the brick's internal schematic and its own capacitors.
Identify the board
[edit | edit source]| Assembly | RAM | Atari figure | Notes |
|---|---|---|---|
| CO70025 | 8 × 4164 (64K × 1) at U9–U16 | 2-7 | The original 65XE board |
| CA20097 | 8 × 4164 at U9–U16 | 2-9 | Labelled "65XEN" by Atari |
| CA200519 / C103579-001 | 2 × 4464 (64K × 4) at U9 and U10 | 2-11 | Cost-reduced board, shared with the 800XE |
Capacitor list
[edit | edit source]| Designator(s) | Value | Rating | Type | Atari part number |
|---|---|---|---|---|
| C1 | 470 µF | 10 V | Aluminium electrolytic, radial | C014368 |
| C2, C3, C10, C79 | 22 µF | 16 V | Aluminium electrolytic, axial | C014393 |
| C24, C50, C98 | 10 µF | 16 V | Aluminium electrolytic, radial | C014392 |
| C19, C20 | 4.7 µF | 35 V | Non-polarised | C061647 |
| C22 | 4.7 µF | 35 V | Non-polarised | C061647 |
Ten parts on the CO70025 board; eleven on the CA20097 and CA200519 boards. The difference is C22: it is not fitted on the CO70025 assembly, whose schematic footnote reads "C19 and C20 are non polarized", while the CA20097 and CA200519 sheets read "C19, C20, C22 are non polarized".[1]
 | C19, C20 and C22 are non-polarised (bipolar) electrolytics in the AC-coupled colour and luminance path. Fitting ordinary polarised parts there is a substitution, not a repair. |
Everything else on the board is a ceramic — 1000 pF, 0.01 µF, 0.1 µF, 0.047 µF, or a small NP0 value in picofarads.[2] There is no 2200 µF part anywhere on any XE board, and no electrolytic above C1's 470 µF.
Where they are
[edit | edit source]C1 sits directly behind the power switch S1 with C2 and C3 beside it, on the +5 V rail from J7 through L32. C24 and C50 are in the video and audio output stages — C24 at the output of the LM358 (U1), C50 at the CD4050 luminance buffer (U20). C98 is on the +5 V feed at the expansion connector J4B. C19, C20 and C22 are in the colour and luminance summing network around U1.[1]
The RF modulator
[edit | edit source]The modulator A1 is a sealed can and no published source gives a component list for its interior, so there is nothing to recap there. The two board capacitors feeding it, C204 and C205, are 0.1 µF ceramics.[2] If the RF picture is poor, use the monitor port — it bypasses the modulator entirely.
Procedure
[edit | edit source]Identical to the 130XE: four screws in the bottom cover, disconnect the keyboard and LED connectors, seven screws holding the shielded PCB, seven shield tabs to unbend.[1] Use 105 °C parts, bipolar parts for C19, C20 and C22, and a higher voltage rating than the original wherever it is convenient — never a lower one.
See Capacitor Failure Symptoms, Battery Explosion, Capacitor or Corrosion Damage and Recommended Tools.
Related pages
[edit | edit source]- Atari 65XE
- Atari 65XE General Maintenance
- Atari 65XE Troubleshooting Guide
- Atari 130XE Capacitor Replacement Guide
- Atari 800XE Capacitor Replacement Guide
References
[edit | edit source]- ↑ 1.0 1.1 1.2 1.3 1.4 Atari, 130XE Personal Computer Field Service Manual, Section 2: figure 2-7 (Atari 65XE 8 × 4164 assembly CO70025), figure 2-9 (Atari 65XEN 8 × 4164 assembly CA20097) and figure 2-11 (Atari 65XE/800XE 2 × 4464 assembly CA200519, title block C103579-001). Hosted on this wiki: File:Atari 130XE Field Service Manual.pdf. Source of every capacitor value and reference designator on this page and of the power connector wiring.
- ↑ 2.0 2.1 2.2 Atari (U.S.) Corp., 130XE Parts List, 25 June 1985. Hosted on this wiki: File:Atari 130XE Parts List and Production Test Instructions.pdf. Atari did not publish a separate 65XE parts list in the material hosted here; the ratings below are the ratings Atari gives for the same designators and the same Atari part numbers on the closely related 130XE board, and the schematic values match. Treat the ratings as a minimum, not as a transcription of a 65XE document.