Brand: Philips
Category: Audio
Document Type: Parts/Service
Language: EN
Parts/Service for CEM3000B
Uploaded: Nov. 21, 2025, 8:31 p.m.
Manual Publish Date: 2011-11-17
The manual provides instructions for disassembling the Philips CEM3000B unit, including detailed steps for removing the panel and main unit components. It also includes a block diagram of the system, wiring diagrams, and detailed circuit diagrams for various boards (Main, Servo, Panel, Remote, Tuner). Component layouts for different PCBs are also provided. A troubleshooting section lists common issues with their potential causes and checks.
Troubleshooting and error codes
| NO. | failure phenomena | failure cause | Tate | remark |
|---|---|---|---|---|
| 1 | NO Power | a. To check whether it is connect well of the ISO connector (4 PIN power input). Whether it is loose of the 15A fuse of the ISO connector, or insert non in place. b. To check whether there is any contamination and bad contact on the 22 Pin male/female connector on the panel and main board. c. To check the power supply of main board B+、ACC should be +12V; The voltage of stabilivolt of ACC power supply circuit ZD3 (6V8) should be 6V8. d. To check the voltage of the 17 pin of U1 MCU should be +4V8. e. To check the voltage of the 16 pin (AVDD) of U1 MCU (T5CL8) should be +5V; The output voltage of U4 (LM2950) should be +5V. f. To check the oscillation frequence of crystal XT4 shuold be 7.2MHz. g. To check the resistor network of NR1 (4K7). H. To check the voltage of the 15 pin(Lamp Vcc) of CN5 should be 6V4. |
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| 2 | NO audio output | a. To check whether the volume knob is turn to the minimum position. b. To check whether the unit is at MUTE mode, press SOURCE button and check whether it is effective of the input sound source. c. To check whether the connection of 8 PIN audio output wire of ISO connector is correct; wrong connection or short circuit to the ground will caused the protection of the power amplifier( no voltage output). d. To check the circuit of power amplifier U3 (LV47002) and VOLUME U5(TDA7419). e. To check the normal voltage of 22 PIN(MUTE) of power amplifier U3(LV47002), normally should be 4V. f. To check the voltage of 20 pin of audio processor U5 (TDA7419), should be +9V0. g. To check the voltage of control PIN SCL、SDA (the 18、19 pin) of audio processor U5 (TDA7419), should be +5V2. |
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| 3 | AM/FM Radio abnormal | a. To check the antenna of the AM/FM tuner. b. To check whether the strength of then input signal of the tuner is too weak. c. To check the voltage of the 5 pin、7 pin、9 pin of the tuner, should be +5V0 d. To check the voltage of the 12 pin(SDA) of the tuner, should be +4V5; the 13 pin(SCL) should be +4V5; the 15 pin (RA-RES) should be +4V9. e. To check the L output voltage of the 10 pin of tuner should be 1V8, the 11 pin R output voltage, should be 1V8. |
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| 4 | DAB Radio abnormal | a. To check the antenna of the DAB tuner. b. To check whether the strength of then input signal of the tuner is too weak. c. To check the supply voltage of the 1 pin of TUN1 (DAB-TUN) should be +1V2; the 2 pin should be +3V3. |
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| 5 | CD defective | a. To check whether the signal format of the disc is correspond to the request of the unit, whether there is any contamination or damage or light leakage on the surface of the disc. b. To check whether there is any abnormal of the rotation of the deck mecahnism, or whether the disc is enter in position. c. To check whether it is normal when reading USB? d. To check whether the 17 P FFC of laser pick up is inserted in place, whether the socket of it is loose. e. To check whether there is any contamination or foreign body on the surface of the laser pick up. f. To check the servo board connector of CN20P1 and main board connector of CN9, whether the socket of it is loose. j. To check the switch SW2 on the servo board. h. To check the rotation mechanism of CD deck mechanism. i. To check whether the rotation belt of deck mechanism is dislocation or loose. |
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| 6 | USB/IPOD defective | a. To check whether the USB/iPOD signal format is correspond to the request of the unit. b. To check the voltage of the the uppermost pin of the USB connector, should be +5V. c. To check whether there is any wearing and scratch of the shrapnel and pin of the panel USB. d. To check whether there is any contamination and bad contact on the male/female connector of the panel and main board. If necessary, can exchange the panel to test whether the defective is occurred by the unit or panel. |
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| 7 | AUX defective | a. To check the SOURCE shoule be in MP3-LINK mode. b. To check the AUX IN input signal. c. To check whether there is any contamination and bad contact on the male/female connector of the panel and main board. If necessary, can exchange the panel to test whether the defective is occurred by the unit or panel. |