Jump to content

Philips CDI 350 Troubleshooting Guide

From RetroTechCollection
Philips CDI 350 drawing from user manual
The CDI 350, from the owner's manual

Philips's service manual for the Philips CDI 350 gives a fixed order for fault finding: check that the player switches on, check the supplies, run the low-level test, run the service shell, and only then measure individual circuits.[1] The low-level test and the service shell work the same way as on the Philips CDI 205, apart from how the service shell is started.[1] Dismantling and the service position for running the board with the cover off are on the Philips CDI 350 General Maintenance page.

Symptoms and first checks

[edit | edit source]
Common symptoms
Symptom Likely cause First check
No power, adapter LED off Mains lead or adapter Check both plugs of the adapter and the socket[2]
No power, adapter LED on DC cable, power button or front CPU Reseat the DC cable and press the power button firmly; then follow the power-on checks below[2][1]
Settings and clock lost at every power-off Flat Timekeeper Replace the Timekeeper[3]
Discs do not spin, input port dead, screen flickers until warm Leaking SMD electrolytics Recap the main board[3][4]
No picture on the LCD Display switched off, or an RGB cable connected Press the display on/off button; unplug the RGB in/out cable[2]
No S-video and no composite output, RGB present Open ferrite bead LP05 on the +12E rail, or reversed capacitors C938 and C991 See video outputs[5]
No sound from the speakers Headphones plugged in, or volume down Unplug the headphones and check the volume control[2]
Disc will not start Disc upside down or dirty, or condensation on the lens Check the disc; after a move from cold to warm, leave the player to acclimatise and do not clean the lens[2]

The owner's manual also notes that a few permanently bright or dark pixels are normal on an active-matrix LCD.[2]

Power-on checks

[edit | edit source]

The power button is read by the front CPU ICF1, which runs from the +5 V standby supply (+5STB) and switches the main supplies on with its POWERC signal. Check in this order:[1]

  1. The +5STB supply to ICF1.
  2. The clock of ICF1.
  3. The key-scan signal of ICF1 while the power button is pressed.
  4. The POWERC signal from ICF1.
  5. The +5M supply for the MMC section, then the other supplies.

The voltages at the main board's power connector JP01 and the rails each pin feeds are tabled on the maintenance page.[1]

Built-in test software

[edit | edit source]

Service shell

[edit | edit source]

The 350 does not use the CDI 205's test plug. Switch the player off, hold the display on/off button and action button 2 (the right-hand one), switch on, and release both buttons once the player is on.[6][4] The shell tests the video circuits with a colour bar pattern, the CD mechanism and servo, the input and output ports and the audio circuits; the CD, servo and audio tests need an audio CD. Its "MMC slave" submenu checks the remote control and the left, right, mono and stereo audio paths.[6][7]

Low-level test

[edit | edit source]

The low-level test runs over the INPUT socket, which is port 2 on the SCC68070's UART. Use a VT220 or VT100 terminal at 9600 baud with no parity and no handshake, or Philips's service PCB 4822 214 52007 with cable 4822 321 61877.[8][9] Start it as on the CDI 205: with the terminal connected, switch the player on while holding the terminal's space bar.[1][10] The test steps and error codes Er05 to Er22 are the same as the 205's and are listed on the CDI 205 troubleshooting guide.[10]

MMC checks

[edit | edit source]

Take clock measurements just after a reset, which happens each time the player is switched on, or when points X and Y are linked in the service position.[8]

MMC clock signals (section 7.2.5.1)
Signal Where Frequency
System clock IC01 pin 30, IC40 pin 119, IC42 pin 119 30.2098 MHz ±600 Hz (NTSC), 30.0000 MHz ±1500 Hz (PAL), set by the PAL/NTSC switch
System clock divided by two IC01 pin 29 15.1049 MHz (NTSC), 15.000 MHz (PAL)
68070 UART clock IC01 pin 69 4.9152 MHz ±250 Hz
68HC05 slave clock IC65 pin 54 4.000 MHz ±100 Hz
CDIC clock IC20 pin 94 22.5792 MHz ±1100 Hz
DSP clock IC21 pin 16 7.5264 MHz ±380 Hz
XT4 clock IC40 pin 17 7.55245 MHz ±150 Hz (NTSC), 7.5000 MHz ±380 Hz (PAL)

[8] After power-on, the 68070 (IC01) should have HALTN (pin 27), RESETN (pin 28) and BERRN (pin 26) high and DTACKN (pin 24) switching. RESETCD should go low for 140 ms ±20 ms at reset.[8]

Disc faults

[edit | edit source]

With track 1 of Philips test disc 5 playing, the voltage across measuring points 1 and 2 (laser current) should be 0.7 V DC ±10 % and across measuring point 3 and ground (focus) +400 mV DC ±10 %. The laser current is set inside the CDM-9 at the factory and needs no adjustment after a mechanism is replaced. The motor control signal is checked with an oscilloscope at IC83 pin 3, the clock at measuring point 29 should be 4 MHz, and the decoder clock at measuring point 34 should be 11.2896 MHz.[11][12]

Audio faults

[edit | edit source]

Use the service shell's "MMC slave" submenu with an audio CD, or a CD-i disc with level A, B and C audio.[7]

  • XIN clock at test point 61: 11.2896 MHz with CD-DA, 9.767 MHz with CD-i level A or B, 4.838 MHz with level C.
  • DEEMP at test point 56: low during track 14 of test disc 5 or 5A (no pre-emphasis), high (+5 V) during track 15 (pre-emphasis).
  • FILTERN at test point 62: high (+5 V) with level C audio, low (0 V) with level A, B or CD-DA.
  • KILL at test point 54: +5 V during reset, −8 V in play.
  • With track 1 of the audio signals disc (SBC 429, 1 kHz at 0 dB), test points 63 and 64 should read 0.9 V rms ±2 dB and the outputs at test points 71 and 72 2 V rms ±3 dB. If the first reading is wrong, check FILTERN, KILL and XIN first.

[7]

Video outputs

[edit | edit source]

The encoder ICE1 is a Sony CXA1145M. With the PAL/NTSC switch SW10 at 525 (NTSC), the subcarrier at test point 83 should be 3,579,545 Hz ±50 Hz; at 625 (PAL) it should be 4,433,618 Hz ±50 Hz, at 400 to 1000 mV peak to peak. If the PAL frequency is off, adjust trimmer CV91. In NTSC the phase-locked loop's lock signal at test point 76 (IC94 pin 3) and its divided VCO output at test point 77 (IC94 pin 14) should both be 39,335 Hz ±8 Hz, and the XT4 clock at test point 79 7,552,450 Hz. The standard control signal SW at test point 78 is high for NTSC and low for PAL.[13]

retrostuff had RGB but no S-video or composite output on a recapped 350. Two causes turned up. He had fitted C938 and C991 the wrong way round, having followed the many + marks on the board instead of the white dots; he turned C991 round and replaced C938. The outputs still stayed dead until he traced the separate +12E supply for the luminance, chrominance and composite output stages back to LP05, a ferrite bead marked as a safety part, which had gone open like a fuse. The 360's parts list gives it as BLM32A07 (4822 158 60636); he fitted one from a spare 350 board.[5][14]

[edit | edit source]

References

[edit | edit source]
  1. ↑ 1.0 1.1 1.2 1.3 1.4 1.5 Philips, Service Manual CDI 350, PDF p. 46, section 7.1 (general sequence: power on/off through the front CPU ICF1, supplies, low-level test and service shell "same as CDI205") and section 7.2.1 (supply at JP01). File:Philips CDI 350 Service Manual.pdf.
  2. ↑ 2.0 2.1 2.2 2.3 2.4 2.5 Philips, CDI 350 owner's manual, PDF p. 15 ("Before requesting service" check list). File:Philips CDI 350 User Manual.pdf.
  3. ↑ 3.0 3.1 retrostuff, "Philips CDI350 Repair Part 1" (27 December 2018, retrieved 2026-10-20).
  4. ↑ 4.0 4.1 retrostuff, "Philips CDI350 Repair Part 2" (3 February 2019, retrieved 2026-10-20): faults cured by recapping; service shell started with display on/off and action button 2.
  5. ↑ 5.0 5.1 retrostuff, "Philips CDI350 Repair Part 3" (24 May 2020, retrieved 2026-10-20): S-video and composite fault, C938 and C991 polarity, LP05 on the +12E rail.
  6. ↑ 6.0 6.1 Philips, Service Manual CDI 350, PDF p. 19, section 5.2 (the service shell; starting it with the display on/off button and action button 2). File:Philips CDI 350 Service Manual.pdf.
  7. ↑ 7.0 7.1 7.2 Philips, Service Manual CDI 350, PDF p. 48, section 7.2.3 (audio measurements). File:Philips CDI 350 Service Manual.pdf.
  8. ↑ 8.0 8.1 8.2 8.3 Philips, Service Manual CDI 350, PDF p. 51, section 7.2.5 (MMC clock signals, reset, 68070 checks, low-level test terminal settings). File:Philips CDI 350 Service Manual.pdf.
  9. ↑ Philips Interactive Media Systems, Service Manual: Portable compact disc interactive player CDI 350/00/05/11/17, March 1993, PDF p. 11, section 3.4.1 (service PCB 4822 214 52007 and cable 4822 321 61877). Hosted as File:Philips CDI 350 Service Manual.pdf.
  10. ↑ 10.0 10.1 Philips, Service Manual CDI 350, PDF pp. 15–18, section 5.1 (the low-level MMC test, start-up with a terminal, error codes). File:Philips CDI 350 Service Manual.pdf.
  11. ↑ Philips, Service Manual CDI 350, PDF pp. 46–47, section 7.2.2 (servo measurements: laser current, focus, motor control at IC83 pin 3, clocks at measuring points 29 and 34). File:Philips CDI 350 Service Manual.pdf.
  12. ↑ Philips, Service Manual CDI 360/00/05/11/17, 4822 725 24112, PDF p. 34, section 7.2.2.1 (laser current 0.7 V DC ±10 % across measuring points 1 and 2; the same text as the 350 manual, whose scan is less legible here). File:Philips CDI 360 Service Manual.pdf.
  13. ↑ Philips, Service Manual CDI 350, PDF p. 49, section 7.2.4 (video encoder measurements and the PAL subcarrier adjustment). File:Philips CDI 350 Service Manual.pdf.
  14. ↑ Philips, Service Manual CDI 360/00/05/11/17, 4822 725 24112, PDF p. 50, parts list, power section (LP05 4822 158 60636 BLM32A07 ferrite bead). File:Philips CDI 360 Service Manual.pdf.


Retrieved from "https://retrotechwiki.com/index.php?title=Philips_CDI_350_Troubleshooting_Guide&oldid=27780"