Text preview for : InterM-L-Series pwramp.pdf part of InterM L Series power amplifier
Back to : InterM-L-Series pwramp.pa | Home
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)
¡á 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 140mV¡- 180mV Channel 1 : DC voltage across R130(6.8¥Ø/1W), adjust VR100
L-1400 120mV¡- 160mV Channel 2 : DC voltage across R230(6.8¥Ø/1W), adjust VR200
¡á 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)
¡á 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 70mV¡- 110mV Channel 1 : DC voltage across R134(3.3¥Ø/1W), adjust V R100
L-2400 60mV¡- 100mV Channel 2 : DC voltage across R234(3.3¥Ø/1W), adjust V R200
¡á CURRENT LIMITS(L-1800/2400)
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-1800 41V~45V Channel 1 : Adjust VR101 & VR102 for symmetry
L-2400 46V~50V Channel 2 : Adjust VR201 & VR202 for symmetry
* Repeat steps 1 through 2 for Channel 2
L-800 L-1400 L-1800 L-2400
Power Output Level
STEREO RL=8§Ù 200W 280W 360W 500W
RL=4 §Ù 300W 450W 600W 750W
RL=2 §Ù 430W 700W 900W 1200W
BRIDGED RL=8§Ù 600W 900W 1200W 1500W
RL=4 §Ù 800W 1400W 1800W 2400W
Frequency Response RL=8§Ù , P.=1W 20Hz~20kHz : ±0/1dB, -3dB : 5Hz~70kHz
THD+N
f=20Hz~20kHz, Half Power(L-800/1400)
1/10Power(L-1800/2400)
STEREO RL=8§Ù & 4§Ù ¡Â 0.03%
BRIDGED RL=8§Ù ¡Â 0.03%
Channel Separation Half Power RL=8§Ù ,
¡Ã 80dB
f=1kHz, ATT. max. Input 600§Ù shunt
Residual Noise (DIN Audio Filter) ¡Â -85dB: ATT min.
Signal-to-Noise Ratio DIN Audio,
¡Ã 100dB
Input 600§Ù Shunt
Input Sensitivity (Rated Power into 4§Ù 1kHz) 2.7dBu 2.7dBu 3.5dBu 3.5dBu
Damping Factor RL=8§Ù , f=1kHz ¡Ã 400
Voltage Gain (ATT max.) 4§Ù 1kHz 30dB 32dB 33dB 34dB
Output Circuitry AB Class AB Class H Class H Class
Input Impedance (ATT max.) ¡Ã 20k§Ù (Balance/Unbalance)
Indicators Power Blue
Clip / Limiter Red
Signal Green
Protection Red
Mode Selector Yellow
Power SW ON/OFF muting, Full short circuit
Protection
Thermal protection, RF protection
Fan Circuit Low-Speed - Variable - Hi-Speed
Power Source AC 220V, 60Hz
Power Consumption(1/8 POWER) 3A 3.5A 4A 4.5A
Weight 14Kg 14.4Kg 15Kg 15.6Kg
Appearance 482(W) x 88(H) x 369(D)mm
Input XLR-3-31 type + 1/4"Phone (balanced), XLR
Connector
Output 5-Way binding posts×2, Speakon Terminal×2
0dB=0.775 Vrms, Half Power=1/2 Power Output Level (Rated Power)
¡Ø This specification and performance might change without a prior notice depending on the company's situations.