HHB-CDR830-cdr-add 维修电路原理图.pdf
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1、 SERVICE MANUAL ADDENDUM RadioFans.CN 收音机爱 好者资料库 2CONTENTS OPERATIONAL DESCRIPTION.page 3 SPECIFICATIONS.page 5 BALANCED ANALOGUE INTERFACE CIRCUIT.page 6 WORDCLOCK AND BALANCED DIGITAL INTERFACE CIRCUIT.page 7 830PLUS PCB LAYOUT.page 8 IC DESCRIPTIONpage 9 CONNECTION & WIRING INFORMATION. page 11 P
2、ARTS LIST.page 14 RadioFans.CN 收音机爱 好者资料库 3OPERATIONAL DESCRIPTION Additional features of the CDR830 PLUS - Word clock input - Balanced digital input - Balanced digital output - Balanced analogue inputs with selectable line/microphone gain settings - Balanced analogue outputs - Parallel remote input
3、 WORD CLOCK INPUT In todays digital studio environment, it is becoming more and more important to be able to lock/synchronise all digital equipment to a common sampling frequency or house clock. The effects of unlocked equipment are all too noticeable as signal degradation, crackles and pops as mach
4、ines clock at different rates. The CDR830 PLUS automatically detects whether there is a valid word clock signal connected to its word clock BNC input connector and if so, routes all digital outputs via a sample rate converter that is locked to the same sampling frequency as the word clock input sign
5、al. If no valid word clock is detected at the input, then digital outputs will be clocked out at the 830s internal clock sampling frequency of 44.1khz. Note: When locked to an external word clock source, the digital outputs do not transmit p/q sub-code information. BALANCED DIGITAL INPUT The balance
6、d digital input is compatible with both consumer and professional interface protocols. It has the electrical characteristics of a professional balanced interface (110 ohm input impedance). In order to select the balanced digital input as source, perform the following: - Set the rear panel switch lab
7、elled SW2 to position 1. BAL - Use the front panel INPUT SELECTOR to select COAXIAL. BALANCED DIGITAL OUTPUT The balanced digital output has the electrical characteristics of a professional balanced interface, the format characteristics of a consumer interface and is always active. BALANCED ANALOGUE
8、 INPUTS It is possible to record balanced line or microphone level analogue inputs. In order to select a line level balanced analogue input as source, set the rear panel switch labelled SW1 to position 2. BAL +4. Use the front panel INPUT SELECTOR to select ANALOG. In order to select a mono or stere
9、o microphone as source, set the rear panel switch labelled SW1 to position 3. BAL -60. Use the front panel INPUT SELECTOR to select ANALOG. 4BALANCED ANALOGUE OUTPUTS The balanced analogue outputs have an output level of +18dBu for 0dBFS. PARALLEL REMOTE INPUT (DIN 8 pin) By connecting the circuit s
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