Dynacord DPA4245 & 4260 free download

File name Dynacord-DPA4245_4260 pwramp.pdf

SERVICE MANUAL DPA 4245 / DPA 4260 POWER AMPLIFIER MEASUREMENT SPECIFICATIONS: DPA power amplifiers Names of the individual printed board assemblies and their corresponding EDP numbers: EDP numbers of the main boards DPA 4245 84 188 Board section Main PCB Supply PCB LED PCB DPA 4260 84 189 Index 1 4 3 complete appliance Input-PCB (index 1) and Output-PCB (Index 2) are located on the printed board assembly 81340. Measuring conditions, unless differently specified: measuring tolerance: measuring frequency: all stated levels refer to: level controls are set to their clockwise margin: XLR connector pin-assignment: X f U = 1.5dB = 1kHz = 775mV (0dBu) PIN 1 = GROUND/SHIELD PIN 2 = + INPUT PIN 3 = - INPUT R(Q) = 50 ohms - source impedance for the induction via the XLR-type connector: - the AMPLIFIER PCB is provided with service connectors: CNS1 PIN 1 2 3 4 5 6 7 8 Assigned to -Vcc BIAS +A BIAS -A FAN Voltage +Vcc BIAS +B BIAS -B Temp Heatsink PIN 1 2 3 4 5 6 7 8 CNS2 CNRC PIN 1 2 3 4 5 6 7 8 Assigned to LIM Out A LIM Out B Standby via RC Standby LED -Vss +Vss n.c. n.c. Assigned to LIM A Switch -15V LIM B Switch +15V AGND Speaker Out A Relay/Protect Speaker Out B - Pin-assignment of the power amplifiers output connector: PIN 1 2 3 4 5 6,7 8 9 10 11 12 Function + pole of the 100V output and + pole of the 25V output - pole of the 25V output and + pole of the 70V output - pole of the 70V output and - pole of the 100V output + pole Direct Output - pole Direct Output not assigned - pole Direct Output + pole Direct Output - pole of the 70V output and - pole of the 100V output - pole of the 25V output and + pole of the 70V output + pole of the 100V output and + pole of the 25V output PIN 1 control voltage PIN 2 control voltage + Channel B - A Pin-assignment of the Power Remote connector: 1 Nominal load impedances 100V output 28,5 20 70V output 14 9,8 25V output 1,8 1,25 DPA 4245 DPA 4260 1. Operation voltage: 2. Deviation limit of the operation voltage: U(B) = 230V / 50Hz ... 60Hz -30% ... +10% 3. Power consumption (both channels driven via the 100V output, f = 1kHz) DPA 4245 30-60W 1580W 470W 1680W 600W DPA 4260 40-80W 1950W 620W 2180W 870W idling condition power consumption nominal power consumption (nominal load) standard power consumption (nominal load) maximum power consumption (nominal load) power consumption at 1/8 of the maximum output capacity 4. Settings 4.1. IDLING CURRENT ADJUSTMENT Connect the DC-volt meter at the BIAS measuring points (refer to service connectors) and adjust the idling current via the trim potentiometer VR101/VR301 (located on the Main PCB). Adjust both channels of the power amplifier A&B to U(DC) = 7.5mV. Adjusting the idling current has to be performed at normal room temperature. In case the power amplifier had previously been operated, it has to be given several hours to regain its normal temperature. 4.2. VCA - OFFSET Rhythmically open and short-circuit CNS2.1 and CNS2.2 for channel A as well as CNS2