InterM L Series free download

File name InterM-L-Series pwramp.pdf

SERVICE MANUAL L-800/1400/1800/2400 CONTENTS Electrical Adjustment Procedure... Specifications ... Electrica Parts List... Top and Bottom View of P.C.Board ... Block Diagram ... Wiring Diagram ... Schematic Diagram ... Exploded View of Cabinet & Chassis / Mechanical Parts List... Ass'y Drawing ... REQUIRED TEST EQUIPMENT 1. Oscilloscope 2. 1kHz audio sine wave generator 3. Digital multimeter 4. 2-ohm resistive load (rated for at least 1200W) Ўб IDLE CURRENT(L-800/1400) 1. Setting set the master volume controls minimum 2. Connection 3. Adjustment While measuring the DC voltage across resistor R130 and R230 adjust VR 100 and VR 200, range as shown below. Model DC voltage range Adjust L-800 140mVЎ- 180mV Channel 1 : DC voltage across R130(6.8ҐШ/1W), adjust VR100 L-1400 120mVЎ- 160mV Channel 2 : DC voltage across R230(6.8ҐШ/1W), adjust VR200 Ўб CURRENT LIMITS(L-800/1400) 1. Setting Channel 1 input : Set the 1kHz sine generator connect Channel 1 output : Connect a 2-ohm load and the oscilloscope probe across 2. Adjustment Turn the volume control back up until the output clips. The voltage at which the signal stars to clip should fall within the range shown below Model Clipping voltage range(2-ohm) Adjust L-800 27V~31V Channel 1 : Adjust VR101 & VR102 for symmetry L-1400 34V~38V Channel 2 : Adjust VR201 & VR202 for symmetry * Repeat steps 1 through 2 for Channel 2 REQUIRED TEST EQUIPMENT 1. Oscilloscope 2. 1kHz audio sine wave generator 3. Digital multimeter 4. 2-ohm resistive load (rated for at least 1200W) Ўб IDLE CURRENT(L-1800/2400) 1. Setting set the master volume controls minimum 2. Connection 3. Adjustment While measuring the DC voltage across resistor R134 and R234 adjust VR 100 and VR 200, range as shown below. Model DC voltage range Adjust L-1800 70mVЎ- 110mV Channel 1 : DC voltage across R134(3.3ҐШ/1W), adjust V R100 L-2400 60mVЎ- 100mV Channel 2 : DC voltage across R234(3.3ҐШ/1W), adjust V R200 Ўб CURRENT LIMITS(L-1800/2400) 1. Setting Channel 1 inp