Service - AMS Neve

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Digital <strong>Service</strong> Manual1. 8 channels of GP output lines each consisting of relay connections NC, NO and Wcorresponding to 'normally closed', 'normally open' and 'wiper'.2. 8 channels of GP input each of which is connected to the anode of an opto isolator input.There is also an isolated return from the common cathodes and ground and 5V lines whichcan be used to drive the opto isolators via external switches.3. The external RS485 connection which can be used to control the rack.J16 carries the following signals which go to the XLR connector PCB via J69:1. Four balanced output signals. These are intended to be used for local monitoring and areat a slightly lower level than the standard line outputs to reduce the amount of headroomwasted when feeding amplifiers. 0dbFS from the console is output at +20dBu balanced.There is no headroom control from the console relating to these outputs.2. The AES sync input from an external sync source. This is a balanced AES audio line.3. The AES sync output from the digital control module's sync circuitry.4. A TTL word clock signal from the external Wordclk input.5. Power to drive the Wordclk receiver and output buffer.Power SupplyMains is present on the backplane in this area. The two power supplies have independentmains connectors each of which feed the power modules via J33, J34 and the two 15 waypower DIN connectors J13 and J14.48 Volts from the two supplies is dioded together by D4 and D5 and filtered by L3 and C30.The two 48V lines are sensed by the two comparators U2 and logically or'ed to give a singlen48VP_OK line for the digital control module.The two 5VA lines are dioded together by D1 and D2 and filtered by C34. The two 5V digitalor VCC lines are dioded together by D6 and D7 and filtered by C33. The four 5V lines aremonitored by the comparators in U1 and diode or'ed to give a composite n5VP_OK line.The 48V ok and 5V okay lines are also diode or'ed to give PSU1 and PSU2 okay lines for thedigital control module.The +16V and -16V line have already been sensed in the power modules and thecomposite 16V okay lines from the power modules go to the digital control module.Because the +/-16V lines have diodes in line within the power modules the outputs of the+16 supplies and -16V supplies are simply joined together on the backplane beforefiltering by L1 and C31 and C32.The returns of the various supplies are kept separate but are joined at the central earth pointwhich is in the middle of the two power module connectors on the backplane. A wire fromthere goes to the rear panel earth lift switch where it can be connected to chassis or not asrequired. For safety the chassis would normally be left securely connected to chassis at theearth lift unless it can be guaranteed that the audio circuitry 0V has a secure path to earth viaanother route.Issue 3 Page 37
Digital <strong>Service</strong> ManualAES960 I/O Unit CardsSMN812-312SMN812-31316 Channel Digital I/O Interface CardBackplane Interface CardIssue 3 Page 38
Page 1 and 2: Logic MMC, Logic DFCLibra Live, Pos
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Page 12 and 13: Digital Service ManualAs the system
Page 14 and 15: Digital Service ManualCard Descript
Page 16 and 17: Digital Service ManualEncore Front
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Page 28 and 29: Digital Service ManualSPS Control C
Page 30 and 31: Digital Service ManualSPS Control C
Page 32 and 33: Digital Service ManualTranSync PLUS
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Page 36 and 37: Digital Service Manual2 Channel Mic
Page 38 and 39: Digital Service ManualXLR Connector
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Page 44 and 45: Digital Service ManualRelay Control
Page 46 and 47: Digital Service ManualSPS - Connect
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Page 50 and 51: Digital Service ManualAES-EBU OUT -
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Page 54 and 55: Digital Service ManualRELAY CONNECT
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Page 60 and 61: Digital Service ManualRecord Tally
Page 62 and 63: MAINS VOLTAGE:FREQUENCY:CURRENT:FUS
Page 68 and 69: Digital Service ManualPower Supplie
Page 70 and 71: Digital Service ManualDual PSU (non
Page 72 and 73: Digital Service ManualSwitch Settin

Service - AMS Neve

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