ARCAM hfe_arcam_alpha_7_8_9_cd_service_en free download

File name hfe_arcam_alpha_7_8_9_cd_service_en.pdf

ALPHA 7/8/9 CD SERVICE MANUAL Arcam Alpha 7/8/9 CD Service Manual DAC & Audio Outputs (Alpha 7 only) The DAC is a Delta-Sigma design from Burr Brown, Issue 1 Serial No. 0001 - (Paul Newton July 96) the PCM1710U. The serial digital data from the decoder Z206 is input Circuit Description to pins 1 to 3. The system clock is input to pin 5. The following notes describe the operation of the The DAC is powered entirely from one 5V supply, Alpha 7/8/9 CD players. They include the circuitry on although it is split and decoupled between the the main, DAC and display PCBs but not that on the analogue and digital sections of the device. servo PCB attached to the mechanism. The analogue outputs from each channel are Power Supplies processed identically.Three poles of filtering are provided by the active filter based around Z1-A. Z1-B The mains input is fitted with inductors L2,3,6,7 to buffers the audio output and sets the output level. filter electromagnetic interference coming out of the player. Muting is provided by turning on Q1 and Q101. Mains transformer T201 has three secondary windings supplying two separate power supplies and DAC & Audio Outputs (Alpha 8 only) an AC supply for the display filament: This is a similar circuit as the one used on the Arcam Analogue Supply Alpha 6 DAC PCB but designed for Sony format input data and a better digital filter, the SM5843AP1, Bridge rectifier D4,5,6,7 and reservoir capacitors Z14.The digital filter is used with a SM5864AP 20-bit C209-C212 produce unregulated split rails of about DAC chip, Z12, (described here as a PWM noise +/-22V. shaper to avoid confusion with the 1-bit DAC Latch Z204 and Z205 provide regulated outputs of +18V which follows it). The output from this is re-latched by and