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Philips CDI 601 General Maintenance

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Philips CDI 601 front and rear panels (Philips brochure)
Front and rear panels of the CDI 601 from Philips's brochure. 11 is the mains voltage selector, 12 and 13 the extension slots, 22 the 525/625 line selector.

No service manual for the Philips CDI 601 has been found, and retrostuff, the CD-i repair site with the most detail on Philips boards, says little is known about its Maxi MMC board.[1][2] What can be maintained from the published sources is the mains setting, the SmartWatch NVRAM socket, the caddy-loading CDM 9 mechanism and the connections. Fault-finding is on the Philips CDI 601 Troubleshooting Guide.

Mains voltage selector

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The 601 runs on 100 to 120 V or 220 to 240 V ± 10 %, set by the 110/220 V selector on the rear panel (item 11 in the brochure drawing).[3] Retrostuff notes that the Maxi MMC and Mini MMC supplies are multi-voltage switch-mode units and that only the professional and authoring players have a selector.[4] Check the selector before connecting a player of unknown history to the mains.

Retrostuff's advice for CD-i supplies is to unplug the mains lead and leave the power switch on for some time before inspecting a supply, because the large filter capacitors can give a shock if they have not discharged; to stay away from the live area when measuring with the supply on; and not to run a supply without a load.[4]

SmartWatch NVRAM

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The 601 keeps its settings and saved data in a Dallas DS1216C SmartWatch RAM socket with an 8 KB SRAM chip plugged into it, for example a Philips FCB61C65LL-70P. Retrostuff says this arrangement is found only in the 601 and 602.[5] The clock and its batteries are in the socket. Every DS1216C socket retrostuff has seen had two batteries, most still working, but it expects them to fail in time.[5]

  • Do not pull the SRAM chip out of the socket: retrostuff warns that this deletes its contents at once.[5]
  • Maxim's recommended replacement for the socket in the 8 KB arrangement is the DS1243Y-120+ 64k NV SRAM with Phantom Clock, which is no longer made.[5]
  • Retrostuff's readers have fitted an additional battery to DS1216C sockets without removing the old ones, following tutorials written for the similar DS1216E; follow the warnings in those tutorials.[5]
  • Buy replacement parts from the manufacturer or an official distributor; retrostuff warns that "new" SmartWatch sockets on eBay or AliExpress are old or fake. Removing the old one needs fresh solder, plenty of flux, a desoldering gun and wick, as some pins are soldered on both sides; fit a standard 28-pin IC socket in its place.[5]

Disc mechanism

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The 601 loads discs in a caddy through the slot on the left of the front panel, and uses the CDM 9 mechanism.[3][6][7] ICDIA describes the CDM 9 as generally considered very reliable, able to read good-quality CD-RW discs although it is not a MultiRead drive.[6] The World of CD-i, a CD-i community site, found that discs that will not spin are most often caused by a turntable that has slipped down its shaft, and that every mechanism it replaced had a damaged flat cable; it never found a dead motor.[7]

Connections

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CDI 601 ports (Philips brochure and 6XX technical documentation)
Port Connector Use Notes
Port 1 (front) 8-pin mini-DIN CD-i pointing device +5 V ± 10 % at up to 200 mA on pin 8; handled by the 68HC05 slave processor
Port 2 (rear) 8-pin mini-DIN Pointing device, CD-i keyboard or RS-232 peripheral
Port 3 (rear) 9-pin D-sub, male RS-232; default terminal 68681 DUART port A: RXD pin 2, TXD pin 3, ground pin 5, RTS pin 7, CTS pin 8
Port 4 (rear) 9-pin D-sub, male RS-232 peripherals 68681 DUART port B; same pinout as Port 3
RGB 9-pin D-sub RGB video, 1 Vpp into 75 Ω Retrostuff's CDI 605 RGB SCART adapter works with the 601

[3][8][9]

The 525/625 line selector (item 22) sits between the Y/C connector and the right audio output.[3]

Preventive maintenance checklist

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  1. Check the voltage selector before powering the player.[3]
  2. Check the date and time after the player has been off for a while; a lost clock points to the SmartWatch batteries.[5]
  3. Play a disc and watch the Reading Disc LED: it lights when a CD-i disc is loaded and flashes while the disc is being read.[3]
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References

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  1. ↑ Retrostuff, "Modifications for Philips CD-i Players" (retrieved 2026-10-20), section "JNMS, Maxi MMC and Mini MMC (prof.)".
  2. ↑ The New International CD-i Association, "CD-i Service Manuals" (retrieved 2026-10-21): no manual for the CDI 601 or 602.
  3. ↑ 3.0 3.1 3.2 3.3 3.4 3.5 Philips Interactive Media Systems, CDI 601 Professional CD-I System, brochure, p. 5: power supply 100-120 V and 220-240 V ± 10 % selectable; front panel key (1 Reading Disc LED, 2 caddy loading slot); rear panel key (11 mains voltage selector 110/220 V, 12 and 13 extension slots, 18 Port 3 default terminal, 20 RGB, 21 Y/C, 22 525/625 line selector). Hosted as File:Philips CDI 601 Brochure.pdf.
  4. ↑ 4.0 4.1 Retrostuff, "Philips CD-i Power Supply Units", 2024, updated 2026 (retrieved 2026-10-20): general information and warning; section "Maxi MMC / Mini MMC".
  5. ↑ 5.0 5.1 5.2 5.3 5.4 5.5 5.6 Retrostuff, "NVRAM+RTC Solutions for Philips CD-i Players", 2021, updated 2025 (retrieved 2026-10-20), sections "32 KB (SmartWatch)" and "8 KB (SmartWatch)".
  6. ↑ 6.0 6.1 The New International CD-i Association, "Comparison table of all Philips professional and authoring CD-i players" (retrieved 2026-10-21): CDI 601/00 caddy loading, CDM 9; "The older CDM-9 is generally considered to be very reliable, and even capable of reading good quality CD-RW discs, although it is no MultiRead drive."
  7. ↑ 7.0 7.1 The World of CD-i, "Chronicle #32: CD-i player CDM substituition", 30 October 2020 (retrieved 2026-10-21): 601/00 uses the CDM 9; a stuck turntable is the most common cause of a disc not spinning; replaced mechanisms had damaged flat cables, never a dead motor.
  8. ↑ Philips Interactive Media Systems, CDI6XX Technical Manual (Technical Documentation for CDI 605 Users), 22 June 1992, chapter 8, Serial Port Specification: Port 1, 8-pin mini-DIN, MMC slave processor (68HC05), +5 V ± 10 % max. 200 mA; Ports 3 and 4, 9-pin sub-D male, 68681 DUART ports A and B, pinout. Hosted as File:Philips CDI 6XX Technical Documentation (1992).pdf.
  9. ↑ Retrostuff, "Philips CDI605 RGB SCART Adapter", 27 January 2021 (retrieved 2026-10-21).


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