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I was having a hard time finding the problem with this Mackie 1604 unit. I didn't have a schematic. Went looking on the web and found your site and the price was more then reasonable. Ordered it and within the hour had the manual and within 15 minutes had the unit fixed. Best $4.99 I ever spent. Thank you.
Doug
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This is a service manual in every sense of the word ( French and German versions of the text are included, as well as English..)
There are explanations of the mechanical and electrical functions, plenty of mechanical drawings, and the needed schematics. The quality of the scanning is excellent - all the component values are clearly legible - and very usefully there are pcb component layouts, so you can find a component on the schematic, and then very quicky pinpoint its physical location on the relevant pcb.
I cannot see how I can give this manual any less than the maximum 5 stars! Great value for money, which will pay for itself immediately. Excellent all round!
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the manual is great and especially hard to find... thanks for the great service and having a hard to find manuel_
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Please tell us what you think and share your opinions with others. Be sure to focus your comments on the product. You will receive $2.50 of store credit for Your review.
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hat alles sehr gut geklappt. Das Servicemaual ist gut zu verwenden. Die Pläne und Schrift
ist klar und leserlich. Außerdem preiswert. Grüße an alle Hifi-Bastler
HDA 280
Audiometric headphones
Design approved by the PTB (German national institute for science and technology). The headphones comply with IEC 60645-1. Important! The HDA 280 is designed for use with an audiometer! After exchanging audiometric headphones, the audiometer has to be re-calibrated!
Specifications
Cat. No. Transducer principle Ear coupling Frequency response Characteristic SPL Max. L/R deviation Max. nominal continuous input power Nominal impedance Contact pressure Connection cable Weight (with cable) Connection code 9860 9861 1 unit 24 units/carton
dynamic, closed supra-aural < 20 Hz to > 20 kHz 117 dB (at 1 kHz, 1 mW) 125 Hz � 4 kHz < 1.5 dB 4 kHz � 12 kHz < 2 dB 500 mW (as per EN 60268-7) 37 � 5 N ± 0.5 N approx. 3 m, open-ended 330 g green copper red copper +L �L +R �R
Pure tone RETSPL
Pure tone reference equivalent threshold sound pressure level Frequency (Hz) 125 250 500 750 1000 1500 2000 3000 4000 6000 8000 10000 12500 dB (re 20 µPa) 38.5 25.0 13.0 9.0 7.5 9.5 8.0 6.5 9.5 19.0 18.0 18.5 30.5 Max. SPL on B&K 4152 < 10 min. dB (at 4 V) 143 ± 3 144 ± 3 144 ± 3 144 ± 3 145 ± 3 145 ± 3 138 ± 3 133 ± 3 137 ± 3 132 ± 5 122 ± 5 110 ± 5 122 ± 5
measured at normal climate: temperature = 20 °C, relative humidity = 50 %, atmospheric pressure approx. 100 kPa
Frequency response curve
dBr
+140 +135 +130 +125 +120 +115 +110 +105 +100 +95 +90 100 200 500 1k 2k 5k 10k
*
Reference equivalent threshold sound pressure level (re 20 µPa) for the HDA 280 headphones and a coupler as per IEC 60318-3 * additional values following ISO 389-1
Peak-to-peak RETSPL
Hz
Measured with B&K 4152 as per IEC 60318-3 Headphone input voltage 500 mVrms
For clicks, 20 Hz � on an ear simulator as per IEC 60318-1 and � on an acoustic coupler as per IEC 60318-3 pe RETSPL = 31.5 dB (re 20 µPa).
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