Philips FW-P900/37 Service Manual page 97

13-1
DPL BOARD
(Dolby Pro Logic)
TABLE OF CONTENTS
Brief Introduction of the DPL Board .............................. 13-1
Component & Chip layout ............................................. 13-2
Circuit Diagram .............................................................. 13-3
Electrical parts list .......................................................... 13-4
BRIEF INTRODUCTION OF THE DOLBY PRO LOGIC (DPL) BOARD
The DPL Board consists of the following features :
a. Dolby Pro Logic (DPL)
Dolby Pro Logic function is provided by IC M62460FP (7711). Delay circuit is also integrated into the same IC.
b. Volume Control for Centre and Surround Channel
Volume control and trim for both centre and surround channel is implemented using IC M62429FP (7712).
c. MCU Control
Separate muting control is available on both the centre and surround channel. MCU interface which is available on pins 19
and 20 of IC M62460FP (7711) are used to send mute control signals.
Bass ALC enable (ALC_EN) is controlled via pin 18 of MCU interface.
d. Software Control
Commands sent on DPL_CLK, DPL_DATA, DPL_V_CLK and DPL_REQ are used for switching in all DPL modes and
leveling changes.
13-1
SPR 00 0138