Alto_APM120,_160_Powered_Mixer_Service_Manual电路图.pdf

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1、RadioFans.CN 收音机爱 好者资料库 MODEL: APM120/160 CONTENT 1. INTRODUCTION.1 2. TECHNICAL SPECIFICATION.3 3. BLOCK DIAGRAM.55 4. SCHEMATIC DIAGRAM.77 5. WIRING DIAGRAM.111 1 6. PCB LAYOUT.131 3 7. TEST PROCEDURE.191 9 8. EXPLODED VIEW 3. Check all the knobs and be sure no frication of it; 4. Check all the ke

2、ys and be sure no frication of it. Instruments Setting: 1. Release all the keys; 2. Rotate the potentiometer of GAIN, AUX, 2TR IN LEVEL and EQ FREQ to minimum in counterclockwise; 3. Rotate the potentiometer of EQ GAIN, EQ FREQ, PAN, BAL, PHONES, ST SUB OUT and ST SUB IN to midpoint; 4. Slide the po

3、tentiometer of all channels, push the EFFECT RTN to -, and push the potentiometer of AUX LEVEL, MONO OUT LEVEL, ST OUT LEVEL and 9-band EQ to 0; 5. Turn the Phantom Power and witch to OFF, push the AMP MODE switch to top. Input signal: 1 KHz sine wave signal (except the special instruction). The uni

4、t have power, the power indicator in board will light up; press the DFX MUTE key down, the PEAK indicator will decrease. 1. MONO CH Test 1). Switch the +48V PHANTOM of the tested channel to ON (every four MONO CH in share), the indicator will light up (red), the corresponding channel MIC socket 2, 3

5、 pin have 472V voltage; Insert the tested LED socket to MIC socket, the two LED will light up and the illumination will match with the sample; After the test is OK, turn the switch to OFF; 2). Input from MIC: BAL-XLR, -30dB, the INSERT output signal of the corresponding channel is BNC-UNBAL, -302dB;

6、 turn the GAIN knob to maximum, the INSERT output is 152dB. After the test is OK, turn the knob to minimum; Input from LINE IN: UNBAL-BNC, -202dB, the INSERT output signal of corresponding channel is -352dB; rotate the GAIN knob to midpoint, the INSERT output is -52dB. Rotate the GAIN knob to maximu

7、m, the INSERT output is 102dB. After the test is OK, rotate the knob to minimum; 3). Input from MIC: BAL-XLR, 1dB, pushes the ST OUT slide potentiometer and the tested channel slide potentiometer to 0, the ST OUT output is 02dB, and the right LEVEL indicator light in 0dB; rotate the GAIN potentiomet

8、er to maximum in clockwise, the output will increase gradually, the channel LEVEL and main output LEVEL indicator signal will enhance gradually, and to CLIP in the end; rotate the GAIN potentiometer to min; insert the disconnect jack to the tested channel INSERT socket, the ST OUT has no output; - 1

9、9 - After the test is OK, take the phantom jack out, the output is 0dB; 4). Press the LOW CUT key in the tested channel down, use AP to test the frequency specification, as for the fig1 After the test is OK, release the LOW CUT key; 5). EQ Test: a. Rotate the HI GAIN knob to min and max to scan the

10、frequency response; rotate the LOW GAIN knob to min and max, as for fig2; After the test is OK, rotate the HI GAIN, LOW GAIN knob to midpoint; b. Rotate the MID-GAIN knob to min, and rotate the MID-FREQ knob to min, mid and max to scan the frequency response in separately; rotate the MID-GAIN knob t

11、o max, and rotate the MID-FREQ knob to min, mid and max to scan the frequency response, as for fig3; After the test is OK, rotate the MID-GAIN, MID-FREQ knob to mid; 6). AUX Output Test: a. Rotate the AUX1 knob in tested channel to min, the AUX1 has no output; b. Rotate the AUX1 knob in tested chann

12、el to 0, the AUX1 output is 02dB; c. Rotate the AUX1 knob in tested channel to +10, the AUX1 output is 102dB. After the test is OK, rotate the knob to 0; d. Push the channel LEVEL to min, the AUX1 has no output; e. Push the channel LEVEL to 0, the AUX1 output is 02dB; f. Push the channel LEVEL to +1

13、0, the AUX1 output is 102dB; After the test is OK, push the slide key to 0; g. Press the AUX1 input selector key down, and select the PRE, the AUX1 output is 02dB, push the LEVEL slide key in channel to max, the output has no variation, release the PRE key, push the channel slide potentiometer to 0

14、to make the AUX1 output is 0dB; After the test is OK, rotate the AUX1 knob to min - in counterclockwise. (the same procedure to test the AUX2) h. Rotate the AUX3 knob in tested channel to min, the AUX3 has no output; i. Rotate the AUX3 knob in tested channel to 0, the AUX3 output is 02dB; j. Rotate

15、the AUX3 knob in tested channel to +10, the AUX3 output is 102dB. After the test is OK, rotate the knob to 0; k. Push the channel LEVEL to min, the AUX1 has no output; l. Push the channel LEVEL to 0, the AUX1 output is 02dB; m. Push the channel LEVEL to +10, the AUX1 output is 102dB; After the test

16、is OK, push the slide key to 0, and rotate the knob potentiometer to min - in counterclockwise. (the same procedure to test AUX4) 7). PAN Test: a. Rotate the PAN knob to LEFT, the ST OUT L output is 22dB, but the ST OUT R has - 20 - no output; b. Rotate the PAN knob to mid, the ST OUT L c. Rotate th

17、e PAN knob to RIGHT, the ST OUT R output is 22dB, but the ST OUT L has no output; After the test is OK, rotate the PAN knob to mid. 8). Press the MUTE key in the tested channel down, the Lens key will light up (yellow), the ST OUT L/R has no output; After the test is OK, release the MUTE key; 9). Pr

18、ess the PFL key in the tested channel down, the Lens key will light up (green), the PHONES output is 02dB, even adjust the channel potentiometer, the output has no variation; adjust the PHONES potentiometer to min, the PHONES has no output; adjust the PHONES potentiometer to max, the PHONES output i

19、s 102dB. After the test is OK, release the PFL key and adjust the PHONES potentiometer to mid. 2. STEREK CH Test 1). Input from LINE IN L: UNBAL-BNC, 0dB, push the slide potentiometer in tested channel to 0, the ST OUT L/R output is -202dB; rotate the GAIN to mid in clockwise, the ST OUT L/R output

20、is 02dB; once rotate the knob to max in clockwise, the output is 202dB. After the test is OK, rotate the knob to mid and make the output is 0dB; 2). EQ Test: a. Rotate the HIGH 12 kHz knob to min (-15) and max (+15), and scan the frequency response respectively, then rotate the knob to mid. b. Rotat

21、e the HI MID 3 KHz knob to min (-15) and max (+15), and scan the frequency response respectively, then rotate the knob to mid; c. Rotate the MID LOW 500Hz knob to min (-15) and max (+15), and scan the frequency response respectively, then rotate the knob to mid; d. Rotate the LOW 80Hz knob to min (-

22、15) and max (+15), and scan the frequency response, then rotate the knob to mid, as for fig4; 3). AUX Output Test: a. Rotate the AUX1 knob in tested channel to min, the AUX1 has no output; b. Rotate the AUX1 knob in tested channel to 0: When it is in the LINE IN L input, the AUX1 output is 02dB; Whe

23、n it is in the LINE IN R input, the AUX1 output is -62dB; c. Rotate the AUX1 knob in tested channel to +10: When it is in the LINE IN L input, the AUX1 output is 102dB; When it is in the LINE IN R input, the AUX1 output is 42dB. After the test is OK, rotate the knob to 0; d. When it is in the LINE I

24、N L input, press the AUX1 selector down and select the PRE output, the AUX1 output is 02dB; push the LEVEL in channel to +10, the output has no variation; release the PRE key, the AUX1 output is 102dB; - 21 - When it is in LINE IN R input, press the AUX1 key down and select the PRE output, the AUX1

25、output is -62dB; push the LEVEL in channel to +10, the output has no variation; release the PRE key, the AUX1 output in 42dB. After the test is OK, push the channel slide potentiometer to 0, and make the AUX1 output is 0dB, then rotate the AUX1 knob to min -. (the same procedure to test AUX2) e. Rot

26、ate the AUX3 in tested channel to min, the AUX3 has no output; f. Rotate the AUX3 knob in tested channel to 0, When it is in the LINE IN L input, the AUX3 output is 22dB; When it is in the LINE IN R input, the AUX3 output is -62dB. g. Rotate the AUX3 in tested channel to 10, When it is in the LINE I

27、N L input, the AUX3 output is 102dB; When it is in the LINE IN R input, the AUX3 output is 42dB. After the test is OK, push the channel slide potentiometer to 0, then rotate the AUX3 knob to min - in counterclockwise. (the same procedure to test AUX4) 4). BAL Test: a. Rotate the BAL knob in tested c

28、hannel to LEFT, the ST OUT L output is 2.52dB, the ST OUT R has no output; b. Rotate the BAL knob in tested channel to mid, the ST OUT L/R output is 02dB; c. Rotate the BAL knob in tested channel to RIGHT, the ST OUT L has no output, the ST OUT R output is 2.52dB; After the test is OK, rotate the BA

29、L knob to mid. 5). Press the MUTE key in tested channel down, the Lens key will light up (yellow), the ST OUT L/R has no output; release the MUTE key, the Lens will decrease and the ST OUT L/R has output; 6). Press the PFL key in tested channel down, the Lens will light up (green), the PHOENS output

30、 is 02dB; once adjust the channel GAIN, the rotate potentiometer has variation in output, the output has no variation after adjusting the channel slide potentiometer. After the test is OK, release the PFL key. 3. ST SUB IN Test: 1). ST OUT Output Test: a. Input from ST SUB: 0dB, rotate the ST SUB kn

31、ob to -, the ST OUT L/R has no output; b. Rotate the ST SUB knob to 0, the ST OUT L/R output is 02dB; c. Rotate the ST SUB knob to +10, the ST OUT L/R output is 102dB; d. Input from ST SUB: 0dB, rotate the ST knob to -, the ST OUT L/R has no output; e. Rotate the ST SUB knob to 0, the ST OUT R outpu

32、t is 02dB, the ST OUT L has no output; f. Rotate the ST SUB knob to +10, the ST OUT R output is 102dB, ST OUT L has no - 22 - output; After the test is OK, rotate the ST SUB knob to 0. 2). AUX SEND Output Test: a. Rotate the AUX knob in tested ST SUB channel to -, the AUX has no output; b. Rotate th

33、e knob to mid 0, the output is 02dB (input from channel R is -62dB); c. Rotate the knob to +10, the output is 102dB (input from channel R is 42dB); After the test is OK, rotate the AUX knob to mid 0. d. Push the AUX LEVEL to -, the AUX has no output; e. Push the AUX LEVEL to 0, the output is 02dB (i

34、nput from sounding channel R is -62dB); f. Push the AUX LEVEL to +10, the output is 102dB (input from sounding channel R is 42dB); g. Press all the AFL (green) in AUX, the PHOENS and AUX have the same output; After the test is OK, push the AUX LEVEL to 0, release the AFL key. 3). PHONES Output Test:

35、 a. Press the PFL key in tested ST SUB channel, the Lens will light up (green), the PHONES L/R output is 02dB; rotate the ST SUB LEVEL potentiometer, the PHOES L/R output has no variation; release the key, the PHONES has no output (when input from R only, the PHONES has no output). After the test is

36、 OK, release the PFL key. 4. 2TR IN/OUT Test: Input from 2TK IN L, R: 0dB signal: 1). Rotate the 2TK IN potentiometer to -, the ST OUT and 2TK OUT L/R has no output; 2). Rotate the knob to 0, the ST OUT and 2TK OUT L/R output is 02dB; 3). Rotate the knob to +10, the ST OUT and 2TK OUT L/R output is

37、102dB; 4). Press the 2TK IN PFL down, the Lens will light up, the PHONES L/R output is 02dB; rotate the 2TK IN potentiometer, it has no variation; After the test is OK, rotate the 2TK IN knob to 0, release the PFL key. 5. ST OUT Output Test: Input 0dB BAL signal from CH1, push the channel slide pote

38、ntiometer to 0: 1). Push the ST OUT LEVEL slide potentiometer to -, the ST OUT L/R has no output; 2). Push the ST OUT LEVEL slide potentiometer to 0, the ST OUT L/R output is 02dB; 3). Push the ST OUT LEVEL slide potentiometer to +10, the ST OUT L/R output is 102dB; After the test is OK, push the ST

39、 LEVEL to 0. 4). Press the 9-band EQ switch down, the indicator will light up (yellow), push the slide potentiometer of each frequency point to top and bottom in return, the frequency response specification as for the fig5. After the test is OK, push all the slide potentiometer to 0 and release the

40、press key. 5). Press the PFL key in ST OUT LEVEL slide potentiometer down, the Lens will light up, - 23 - the PHONES L/R output is 02dB, and it has no PHONES output effect when push the slide potentiometer. After the test is OK, release the PFL key. 6). Press the AFL in ST OUT LEVEL slide potentiome

41、ter down, the Lens will light up, the PHONES L/R output is 02dB; push the slide potentiometer to bottom, the PHONES has no output; push the slide potentiometer to top, the PHONES output is 102dB. After the test is OK, release the PFL, and push the ST OUT LEVEL to 0. 6. ST SUB OUT Output Test: 1). Ro

42、tate the ST SUB OUT knob to -, the ST SUB OUT L/R has no output; 2). Rotate the knob to 0, the ST SUB OUT L/R output is 02dB; 3). Rotate the knob to +10, the ST SUB OUT L/R output is 102dB; After the test is OK, rotate the ST SUB OUT knob to 0. 7. MONO OUT Test: 1). Push the MONO OUT LEVEL slide pot

43、entiometer to -, the MONO OUT has no output; 2). Push the slide potentiometer to 0, the MONO OUT output is 02dB; 3). Push the slide potentiometer to +10, the MONO OUT output is 102dB; After the test is OK, push the MONO LEVEL slide potentiometer to 0; 4). Turn the LPF on board to ON, scan the output

44、 frequency response, and then turn the LPF potentiometer to maximum in clockwise, scan the output frequency response, please see the attachment figure6; After the test is Ok, turn the LPF switch to OFF; 5). Press the AFL on MONO OUT slide potentiometer down, the Lens will light up (green), the PHONE

45、S L/R output is 02dB; turn the slide potentiometer to minimum, the PHONES has no output; turn the slide potentiometer to maximum, the PHONES output is 102dB; After the test is OK, release the AFL and turn the slide potentiometer to 0; 8. DSP Test: Press the DFX MUTE key to make the DSP PEAK indicato

46、r gradually decreased: 1). Turn the EFFECT RTN slide potentiometer, AUX1-AUX4 rotate potentiometer of CH1, and AUX1-AUX3 of DSP CH1 to 0; observe the ST OUT, the AUX1-AUX3 has the same output signal waveform, rotate the PRESETS potentiometer to make it dial at 1-16, each rotate, the indicator will f

47、lash and the relay will drive one time, the variation of the output signal waveform coincide with the sample; 2). Rotate the VARIATIONS potentiometer to point at the 116, each rotate will make the indicator flashing and the relay driving for one time, the variation of output signal waveform coincide

48、 with the sample. 3). Put the EFFECT RTN slide potentiometer on channel DSP and rotate potentiometer to -, 0, +10, observe each output signal waveform coincide with the sample. After the test is OK, rotate the PRESETS, VARIATIONS to midpoint 1, push the - 24 - EFFECCT RTN slide potentiometer and AUX

49、1-AUX3 rotate potentiometer to -. 9. Amplifier Output Test (RMS Test): Turn the POWER AMP switch to ON, input from MIC1: -5dB sine waveform signal, rotate the GAIN to minimum, push the channel, ST OUT, AUX1 and MONO slide potentiometer to +10: 1). Connect a 4load resistor in each output terminal 1+, 1- of APM L/R, turn the AMP MODE switch to MAIN L+MAIN R and use this mode to output, the left and right AMP output power is 300W (APM160 is about 500W), THD1%: 2). Turn the AMP MODE switch to A