Page 9
AD‐900 Alignment Procedures (MN3008 version) 1. Setting before alignment 1) De‐solder and remove one lead of R58 (10K) to cut the dry signal line. 2) Turn TR6 (level) trimmer CW. Set all other trimmers to 50%. 2. Power Supply 1) Connect DC power supply to AD‐900 DC input jack. 3. Clock alignment Setting: Insert shorted ¼” plug into Input jack and turn controls as follows. D‐Time CW, Repeat CCW, D‐Level CW 1) Connect the probe of frequency counter to CP6. (clock line) 2) Turn TR1 to align clock to 7KHz ±200Hz. 3) Turn D‐Time control CCW. Check if the frequency counter indicates 110 to . 140KHz. 4. BBD Balance alignment Setting: Insert shorted ¼” plug into Input jack and turn controls as follows. D‐Time CW, Repeat CCW, D‐Level CW 1) Connect the probe of oscilloscope to CP1. Set the oscilloscope to get the waveform as shown in fig. 1‐a. 2) Turn TR3 to get the waveform as shown in fig. 1‐b. 3) Connect the probe of oscilloscope to CP2. 4) Turn TR5 to get the waveform as shown in fig. 1‐b. 5) Connect the probe of oscilloscope to CP3. 6) Turn TR8 to get the waveform as shown in fig. 1‐b. 7) Connect the probe of oscilloscope to CP4. 8) Turn TR10 to get the waveform as shown in fig. 1‐b. ...
Page 10
AD‐900 Alignment Procedures (MN3008 version) 4. BBD Bias alignment Setting: Input 400Hz/0dBu sine wave (0dBu = .78V RMS) into AD‐900 input generator. with audio generator and turn controls as follows. D‐Time CCW, Repeat CCW, D‐Level CW 1) Connect the probe of oscilloscope to CP1. 2) Turn TR2 and align sine wave to be symmetrical at top and bottom Turn D‐Time control CW, check if sine wave is symmetrical. Fig.2‐a & 2‐b depict sine wave out of symmetry. Fig. 2‐c depicts sine wave symmetrical (D‐Time CCW) Fig. 2‐d depicts sine wave symmetrical (D‐Time CW) 3) Connect the probe of oscilloscope to CP2. 4) Turn TR4 and perform the same alignment as mentioned above. 5) Connect the probe of oscilloscope to CP3. 6) Turn TR7 and perform the same alignment as mentioned above. 7) Connect the probe of oscilloscope to CP4. 8) Turn TR9 and perform the same alignment as mentioned above. ...
Page 11
AD‐900 Alignment Procedures (MN3008 version) 6. Level alignment Setting: Input 400Hz/‐20dBu sine wave (‐20dBu = .078V RMS) into AD‐900 input genera with audio generator and turn controls as follows. D‐Time CW, Repeat CCW, D‐Level CW 1) Connect level meter to output jack. 2) Turn TR6 and align output level to ‐20dBu. 3) Alternate: Turn TR6 and align output level for .078V RMS. 7. Connection of dry signal line Solder R58 (10K) which had been removed in 1. 1) and connect dry signal. 8. Sound check 1) Repeat alignment Setting: D‐Time CW, Repeat 3:00, D‐Level CW Input guitar signal and align TR11. Repeats should last 10 times before becominbecoming inaudible on the 11 time. Check if self‐ oscillates when turning turning Repeat control fully CW. 2) Check the function of each control. ...
Need help?
Do you have a question about the AD-900 MN3008 and is the answer not in the manual?
Questions and answers