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Philips CDI 220 General Maintenance

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Philips CDI 220-77 opened
CDI 220/77 with the cover off: CD loader (left), the cage for the Digital Video cartridge over the mainboard (centre) and the switch-mode power supply (right) (photograph: Evan-Amos)

Routine maintenance on the Philips CDI 220 CD-i player comes down to four areas: opening the case, the battery-backed NVRAM, the power supply and its fuses, and the CD loader. The 220 was built on five different mainboards, so several steps depend on the version number on the type plate (for example 220/20 or 220/60); the versions table on the main page lists them.[1] Fault finding is on Philips CDI 220 Troubleshooting Guide and capacitor lists are on Philips CDI 220 Capacitor Replacement Guide.

Safety

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  • The power supply panel is at mains voltage. Philips asks for repairs to be done with the player on an isolating transformer and for no modules to be changed while the set is switched on.[2] retrostuff's advice is to unplug the player and leave the power switch on for a while before inspecting the supply, so that the large filter capacitors discharge.[3]
  • The CD mechanism uses an infrared laser. The service manual covers carry the Class 1 laser product label and Finnish, Swedish and Danish warnings about invisible laser radiation when the unit is open and the interlock defeated.[4]
  • Most ICs are sensitive to static. Philips specifies a wrist strap connected through a resistor to the chassis ground of the set, and plastic alignment tools.[2]

Opening the player

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The case screws are Torx. retrostuff used a T8 on the 220/00 and found T8 or T9 suitable on a 220/20.[5][6] Philips's exploded views give metal screws as M2.5 × 6 mm and plastic screws as 3 mm × 10 mm unless marked otherwise.[7]

220/60 and later (Mono III, Mono IV)

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The exploded view in the 220/60 manual gives the number of screws holding each part.[7] Its tree shows the order: the cover comes off first; the front must come off before the display panel, the headphone panel and the power switch; and the gliding support (the cage for the Digital Video cartridge) must come off before the mainboard, the power supply panel and the cover plate.[7]

220/60 screw counts (exploded view of the cabinet)
Part Screws
Cover 7
Front 4
Headphone panel 2
Display panel 6
Power switch 2
Loader (CDM 12.4) 3
Gliding support 1
Mono panel (mainboard) 8 on /60; 10 on /61, /65, /77
Power supply panel 3
Cover plate 4
Text plate (rear panel) 3

220/20 (Mono I)

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retrostuff took a 220/20 apart down to the solder side of the mainboard:[6]

  1. Remove seven screws and lift off the outer shell.
  2. Remove six screws and take out the Digital Video cartridge slot; a cartridge can stay in it. The mainboard is now visible.
  3. Unplug the connector to the power supply board.
  4. Remove eight screws from the back and four screws and three connectors from the front panel.
  5. On the disc drive, remove two screws, pull the tray out until two holes line up over two more screws, remove those and lift the drive. It is joined to the mainboard by three connectors, one of them a fragile flex cable.
  6. Remove the two screws that hold the mainboard and lift it.

When refitting the display board, retrostuff warns not to put screws into the two holes marked on its photographs, as they could damage the display.[6]

220/00 (Mini-MMC)

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The 220/00 has many separate boards, wires and metal parts. retrostuff reached the Timekeeper chip on the MMC board this way:[5]

  1. Remove five screws with washers and lift the top case, then remove the rear bezel (three screws) and the door of the Digital Video cartridge slot.
  2. Slide out the cartridge base and the plastic guide on each side.
  3. Leave the board that carries the cartridge connector screwed in place; remove the metal piece behind it (two screws) and lay the assembly over towards the CD side.
  4. Remove three screws and lift the mainboard.

retrostuff later found that the Timekeeper can also be reached by removing the bottom of the case.[5]

NVRAM and clock battery

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The CDI 220 keeps its settings, the clock and game saves in battery-backed NVRAM. Two systems are fitted, and they are not interchangeable:[8]

NVRAM by version
Versions Part listed by Philips Type
220/00 – 8 KB Timekeeper (ICDIA)
220/20 7224 MK48T08B-15 8 KB Timekeeper
220/40 7217 MK48T08B-15 (ICDIA lists 32 KB) 8 KB or 32 KB; check the board
220/60 7241 NVRAM assembly 32k × 8 32 KB SmartWatch
220/80 7241 NVRAM 32 × 8 32 KB SmartWatch

[1][9][10][11][12]

The 8 KB part is an SGS-Thomson Timekeeper with the battery and 32.768 kHz crystal inside the chip; once the oscillator has been running the battery lasts some years, and a flat one loses the settings and clock and can stop the player at a light blue screen or a "memory full" error.[8] The 32 KB system is a Dallas DS1216C SmartWatch socket (retrostuff has found two batteries inside every one he has opened) carrying a 32 KB SRAM such as the Mitsubishi M5M5256DP; the Evan-Amos photograph of a 220/77 mainboard shows an M5M5256DP-70LL in this position.[8][13]

  • Back up saves before touching the NVRAM. retrostuff uses a null-modem cable with an 8-pin mini-DIN plug and either the CD-i'nterlink disc with a terminal program or the CD-i Link program; the three-wire cable described with CD-i Link did not work for him and he rebuilt it with six wires to Philips's specification.[14]
  • Never pull the SRAM out of a SmartWatch socket with the batteries in place: it loses its contents at once. Never fit an 8 KB Timekeeper into the 32 KB socket.[8]
  • Replace an 8 KB Timekeeper with a 28-pin socket and a new ST M48T08-150PC1 or a Dallas DS1643. The DS1643 ignores clock calibration data.[8]
  • For the 32 KB socket Maxim recommends the DS1244Y-70+; the Glitch Works GW-1244-1 module is an alternative. Batteries can also be added to an old socket, following the published DS1216 tutorials and their warnings.[8]
  • The old chips are often soldered on both sides of the board. Use fresh solder, plenty of flux and a desoldering gun, and choose a standard (not precision) wide 28-pin socket.[8]
  • An 8 KB Timekeeper can be calibrated from the low-level test with a frequency counter; the counter should read between 511.96724 and 512.03276 Hz on the pin the service manual gives.[15]

Power supply

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Mono I and Mono II (220/20 to 220/57)

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These players have a transformer supply on power supply board 3104 123 4060, wound for one region. Only the European and UK versions can be changed over, by moving the jumper between 9803 (220-230 V) and 9802 (240 V).[3] The outputs are +5 V, −5 V and +25 V.[3][16]

  • Fuses: 1805 (T2A) protects the +5 V and +25 V rails and 1806 (T1A) the −5 V rail.[17][3] retrostuff gives the main glass fuse by region and the Philips jumper and fuse table for the transformer variants.[3]
  • The +5 V rail is set with trimmer 3807.[18]
  • Re-solder the pads of the power connector and the other connectors on the supply board; retrostuff found the power connector pads in particular prone to damage from mechanical stress.[3]
  • Do not run a European or UK player on 120 V, or an American 120 V player on 230 V mains. Use a step-up or step-down transformer.[3]

Mono III and Mono IV (220/60 to 220/97)

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These have multi-voltage switch-mode supplies: the 20PS302 in the Mono III players and the 20PS306 in the Mono IV players, each with +5 V, −5 V and +24 V outputs and a T1.0A main glass fuse at 1101.[3] Philips's parts list gives four rail protection devices, 1201 to 1204 (65 V 4 A).[19] The −5 V rail has a further fuse on the mainboard: 3274 at grid F3 on Mono III, 3255 (Littelfuse MP100, 1 A) near the power connector on Mono IV.[20]

CD loader

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The 220/00 to 220/57 use the CDM 9 mechanism, the 220/60 the CDM 12.4 and the 220/80 the CDM 12.1.[1] Philips treats the CDM as an assembly and sets the laser current at the factory: after fitting a replacement CDM 9 no adjustment is needed.[21] ICDIA describes the CDM 9 as generally reliable.[1] On a CDM 12.1, retrostuff greased the gears and the metal rod the sledge runs on after a repair, running the sledge in and out from the service shell to spread the grease, and notes that the Philips VAM 1202 is the replacement part sold for the CDM 12.1.[22]

Preventive checklist

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  1. Back up the NVRAM before any work on the board.
  2. Check the version number and confirm which mainboard and supply you have.
  3. Check the mains voltage setting against your supply (Mono I and II).
  4. Inspect the NVRAM chip or socket and plan its replacement if the player forgets its settings.
  5. Measure the supply rails as given on the troubleshooting guide.
  6. Inspect the electrolytic capacitors against Philips CDI 220 Capacitor Replacement Guide.
  7. Start the service shell and run the CD drive test after reassembly.
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References

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  1. ↑ 1.0 1.1 1.2 1.3 ICDIA, "Comparison table of all Philips and Philips-build consumer CD-i players" (retrieved 2026-10-20): NV-RAM size, CDM and PCB for each CDI 220 version; the CDM 9 described as generally considered very reliable.
  2. ↑ 2.0 2.1 Philips, Service Manual CDI 220/20/25/31/37/39 (4822 725 24182), PDF p. 4, section 3.1 (safety instructions: ESD wrist strap, isolating transformer, no module changes with the set switched on, plastic alignment tools). File:Philips CDI 220-20 Service Manual.pdf.
  3. ↑ 3.0 3.1 3.2 3.3 3.4 3.5 3.6 3.7 retrostuff, "Philips CD-i Power Supply Units" (retrieved 2026-10-20): Mono I/II board 3104 123 4060, region variants, jumpers 9802/9803, fuses 1805 and 1806, solder pad damage, conversion advice; 20PS302 and 20PS306 outputs and main fuse; the safety warning.
  4. ↑ Cover pages of the CDI 220/20, /40, /60 and /80 service manuals (Class 1 laser product label, laser radiation warnings). Philips CDI 220 Service Manuals.
  5. ↑ 5.0 5.1 5.2 retrostuff, "Philips CDI 220/00 Mini MMC 60Hz Modification and Timekeeper Replacement" (retrieved 2026-10-20).
  6. ↑ 6.0 6.1 6.2 retrostuff, "60 Hz Modification Tutorial for Philips CD-i Player CDI 220/20" (retrieved 2026-10-20).
  7. ↑ 7.0 7.1 7.2 Philips, Service Manual CDI 220/60/61/65/77 (4822 725 24754), PDF p. 12, section 4.1 (exploded view of the cabinet, with screw counts and screw sizes). File:Philips CDI 220-60 Service Manual.pdf.
  8. ↑ 8.0 8.1 8.2 8.3 8.4 8.5 8.6 retrostuff, "NVRAM+RTC Solutions for Philips CD-i Players" (retrieved 2026-10-20).
  9. ↑ Philips, Service Manual CDI 220/20/25/31/37/39 (4822 725 24182), PDF p. 50, section 8.4 (7224 MK48T08B15). File:Philips CDI 220-20 Service Manual.pdf.
  10. ↑ Philips, Service Manual CDI 220/40/41/45/57 (4822 725 24722), PDF p. 48, section 8.4 (7217 MK48T08B15). File:Philips CDI 220-40 Service Manual.pdf.
  11. ↑ Philips, Service Manual CDI 220/60/61/65/77 (4822 725 24754), PDF p. 42 (7241 assy NVRAM 32k × 8). File:Philips CDI 220-60 Service Manual.pdf.
  12. ↑ Philips, Service Manual CDI 220/80/85/97 (4822 725 24774), PDF p. 40 (7241 NVRAM 32x8). File:Philips CDI 220-80 Service Manual.pdf.
  13. ↑ Evan-Amos, photograph of a CDI 220/77 Mono III mainboard, hosted as File:Philips CDI 220-77 Mono III mainboard.jpg.
  14. ↑ retrostuff, "Philips CD-i Player Null-Modem Cable for Data Backup and Restore" (retrieved 2026-10-20).
  15. ↑ retrostuff, "Philips CD-i Timekeeper Clock Calibration" (retrieved 2026-10-20).
  16. ↑ Philips, Service Manual CDI 220/20/25/31/37/39 (4822 725 24182), PDF p. 42, section 7.2.5.1 (supply voltages at connector 1001). File:Philips CDI 220-20 Service Manual.pdf.
  17. ↑ Philips, Service Manual CDI 220/20/25/31/37/39 (4822 725 24182), PDF p. 44, section 8.3 (1805 fuse T2A, 1806 fuse T1A). File:Philips CDI 220-20 Service Manual.pdf.
  18. ↑ Philips, Service Manual CDI 220/20/25/31/37/39 (4822 725 24182), PDF p. 38, section 7.2.1 (power supply section: +5 V adjusted with potmeter 3807). File:Philips CDI 220-20 Service Manual.pdf.
  19. ↑ Philips, Service Manual CDI 220/60/61/65/77 (4822 725 24754), PDF p. 36, power supply parts list (1201 to 1204, PROT DEV 65V 4A). File:Philips CDI 220-60 Service Manual.pdf.
  20. ↑ retrostuff, "Philips CD-i Mono III / IV Fuses" (retrieved 2026-10-20).
  21. ↑ Philips, Service Manual CDI 220/20/25/31/37/39 (4822 725 24182), PDF p. 38, section 7.2.2.1 (laser current: a factory adjustment in the CDM 9, no adjustment after replacing a CDM) and PDF p. 37, section 7.1 (the CDM 9 replaced as an assembly). File:Philips CDI 220-20 Service Manual.pdf.
  22. ↑ retrostuff, "Philips CDI470 Diagnosis and Repair" (retrieved 2026-10-20): work on the CDM 12.1 of a Mono IV CDI 470.


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