Table Of Contents - Philips MC-i200/37 Service Manual

9-1
COMBI & REGULATOR
BOARDS

TABLE OF CONTENTS

Brief Introduction of the Regulator & Combi Boards .............. 9-1
Regulator Board - Component & Copper side layout ............ 9-2
Regulator Board - Circuit diagram .......................................... 9-3
Combi Board - Chip layout ..................................................... 9-4
Combi Board - Component layout .......................................... 9-5
Combi Circuit - Power Amplifier part ...................................... 9-6
Combi Circuit - Source Select & Sound Control part ............. 9-7
Combi Circuit - Headphone Amplifier part .............................. 9-8
Combi Circuit - Connector part ............................................... 9-9
Electrical parts list ................................................................. 9-10
Brief introduction of the Regulator Board
The regulator board provides the following:
a) 12V supply : +12V_A and +12V_D derived from the +A supply
b) 5,6V and 5V supply : +5V6 and 5V_iAM derived from the +A/2 supply
Brief introduction of the Combi Board
1. Source select & Sound control
Audio Processor IC 7506 (TDA7468D) provides the source selection and sound control features via the I2C bus (I2C_CLK
and I2C_DATA lines).
2. Line out
Line out is taken directly from the Audio Processor IC 7506. Muting is done via transistors 7003, 7007 and 7008.
3. Pre-amplifier
IC 7700 (NJM4556AM) provides pre-amplification of the output signals from the Audio Processor IC 7506. Muting of audio
signals to Power Amplifier IC 7301 and 7302 during Headphone application and Source switching is done via transistors 7328
and 7329.
4. Headphone and Subwoofer outputs
The Headphone and Subwoofer outputs are taken from the pre-amplifier out. Muting of these outputs are done via transistors
7004, 7009, 7011 and 7012.
5. Power Amplifier
IC 7301 and 7302 (AN7591) are used as Power Amplifier. They function as Super Class G Amplifier together with transistors
7304 and 7309 (STP16NE06) which switches the supply between supply source A1, B1 and C1.
6. I/O Expander
I/O Expander IC 7005 (M62320FP) converts the I2C bus (I2C_CLK and I2C_DATA lines) into additional control lines.
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