ARCAM Arcam-CD-92-Service-Manual free download

File name Arcam-CD-92-Service-Manual.pdf

Service Manual CD72/92 Issue 1.0 DiVA CD72, CD92 Compact Disc Player ARCAM Contents List ! Contents list ! Circuit description ! Upgrade procedure ! Service guide ! Circuit diagrams ! Component overlays ! Circuit board parts list ! General assembly parts list The keyboard scanning works by connecting the keys to a CD72/CD92 Circuit Description resistor ladder on an ADC input to the micro. Pressing a key presents a unique voltage to this input. The remote control data contains a `Customer Code' that SUMMARY identifies this as an Arcam product. The diode network D291 to D297 configures the micro to accept this code. The Main PCB for the DiVA CD72/92 player may be built as two different versions: ! With all components fitted for the Alpha CD72 Motor Driver (L887RS) The status of the drawer is indicated to the micro by two micro ! With audio components and connectors omitted, for switches `INSW' and `OUTSW' on SK205. The micro controls use as a motherboard for plug-in DAC module L816 the drawer motor via driver Z210. (L888RS) for CD92 The CD72 version may be converted for use with a upgrade plug-in DAC board by removing a configuration connector. DAC & System Clock The system is based on a Sony kit, comprising CDM14-5BD10 The DAC is a Burr Brown PCM1716. Mute, attenuation and de- laser mechanism & loader, micro-controller and fluorescent emphasis functions can be controlled via a 3-wire serial link display. from the system micro to pins 26, 27 & 28 via resistors R31 R32 & R33 respectively. Currently resistors R31 to R33 are not The PCM 1716, as per the 1710, can be operated in either fitted and the DAC is configured for hardware control. Software or Hardware mode. The default for the CD72 is hardware mode. Digital audio is input on pins 1, 2 & 3 in standard Sony format, i.e. Word Clock, Bit Clock and Data.