Philips mc 235 b service manual

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1-2 LOCATION OF PRINTED CIRCUIT BOARDS /21 /22 /25 /30 /37x x x x x n i R D C / n i x u A Line Out Video Out Surround Out Subwoofer Out Power Booster Out Digital Out Digital in Matrix Surround x x S D R x x s w e N Dolby Pro Logic (DPL) Incredible Surround Karaoke Features Vo x r o t c e l e S e g a t l ECO Power Standby (LCD Display Off) x x ECO6 Tuner Board - Systems Non-Cenelec x x x ECO6 Tuner Board - Systems Cenelec x x USB PC LINK VERSION VARIATIONS: Type /Versions: Features & Board in used: SPEAKER BOARD POWER BOARD DISPLAY BOARD KEY_A BOARD MAIN BOARD O B B _ Y E K R A D HEADPHONE BOARD KEY_C BOARD FM/AM BOARD MC230 MC235 /37/79 MC235B /79 /05 /12 xx xx x x x x x x x x x x xx

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1-3 SPECIFICA TIONS GENERAL: Mains voltage : 120/240V ± 15% Switchable for /21 120V ± 10% for /37 230V ± 10% for /22/25 240V ± 10% for /30 Mains frequency : 50/60Hz Clock accuracy : < 4 seconds per day Dimension centre unit : 250 x 245 x 96 (mm) Power consumption Active : 15W for /21/22/25/37/30 Standby : < 6W (DEMO mode off) ECO Power Standby : < 1W for /22/25 TUNER: FM T uning range : 87.5-108MHz Grid : 50kHz 100kHz for /21/37 IF frequency : 10.7MHz ± 20kHz Aerial input : 75 -„¦ coaxial 300 -„¦ for /37 Sensitivity at 26dB S/N : < 22dBf Selectivity at 300kHz bandwidth : > 33dB Image rejection : > 20dB [> 25dB] Distortion at RF=1mV, dev. 75kHz : < 3% -3dB Limiting point : < 23.5dB Crosstalk at RF=1mV, dev. 40kHz : > 26dB MW T uning range : 531-1602kHz 530-1700kHz for /21/37 Grid : 9kHz 10kHz for /21/37 IF frequency : 450kHz ± 1kHz Aerial input : Frame aerial 18.1 µH Sensitivity at 26dB S/N : < 4.0mV/M [> 3.25mV\ /M] Selectivity at 300kHz bandwidth : > 20dB IF rejection : > 24dB Image rejection : > 20dB [> 28 dB] Distortion at RF=50mV, M=80% : < 5% AMPLIFIER: Output power L & R : 2 x 5W FTC (4 -„¦, 1kHz, 10% THD) Frequency response within -3dB : 60Hz-14kHz Digital Sound Control (DSC) : Jazz / Rock / Pop / Classic Dynamic Bass Boost (DBB) : Jazz / Rock / Pop / Classic Input sensitivity Aux in (at 1kHz) : 500mV at 600 -„¦ Output sensitivity Headphone output at 32 ohm : 15mW ± 2dB (Max. vol.) COMPACT DISC: Frequency response within ± 3dB : 63Hz - 14kHz Output level (in Vrms) : 500mV, Z out = 100 -„¦ Signal/Noise ratio (A-weighted) : > 67dBA Distortion at 1kHz : < 0.02% Channel unbalance at 1kHz : < ±2dB Channel separation at 1kHz : > 30dB Emphasis : 15/50 µS (switched automatically by CD10) THD Noise(1kHz) : < 1.5% Outband Attenuation : > 35dB [....] Values indicated are for /22/25 only.