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This service manual is a good copy of the original, complete and fully readable. It is really useful to repair my Tv set following its clear instructions.
 ;
Excellent quality. Easy process to download. No issues or problems at all - was exactly what I was looking for and needed. Great service.
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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_
TEST PROCEDURES
6.1 Connect the amplifier leads to either the left or right channel inputs of the Acoustimass® module. 6.2 Set the oscillator frequency to 90 Hz and the amplifier output for 30 volts. Connect a voltmeter across the output terminals of the Acoustimass module. Caution: Do not apply the signal for more than 60 seconds. There should be a gradual reduction in the sound level and the voltage should decrease from approximately 8 to 4 Vrms. Repeat this test for the other channel. 7. Woofer Phase Test: Adjust the frequency of the oscillator to 45 Hz and the amplifier output to 10 Vrms. Next, disconnect either the left or right input to the base module. The sound output from the base module should decrease. Note: If the sound output increases, stays the same or stops completely, check for a defective woofer or incorrect wiring of the woofer. Note: If any of the voltage readings should fall outside of the specified limits, the following items should be checked: A. B. Crossover wiring Protection lamps DS6 or DS3 for continuity as well as all other components on the crossover assembly PC board. C. Make sure all twiddlers� are operating properly.
Acoustimass Testing (Module Only)
11. Woofer Rub and Tick Test: The woofer rub and tick test for the Acoustimass module will be the same as that performed for the entire system (see Procedure 1). 12. Woofer Sweep Test: The woofer sweep test for the Acoustimass module will be the same as that performed for the entire system (see Procedure 2). 13. Air Leak Test: The woofer air leak test for the Acoustimass module will be the same as that performed for the entire system (see Procedure 5). 14. Automatic System Protection Test: To test the protection circuitry, test each channel separately. The automatic system protection test for the Acoustimass module shall be the same as that specified for the system testing except that two 8 ohm, 15 watt resistors shall be used as resistive loads in place of the satellite speakers as shown in Figure 3.
Crossover Testing
Adjust the amplifier output for 2 Vrms and perform the following tests: 8. Adjust the oscillator frequency to 100 Hz and measure the voltage across the input terminals of the left and right satellite speakers. The voltage measured should be 0.56 ±0.12 volts. Re-adjust the oscillator frequency to 2.5 kHz. The voltage measured across the input terminals should be 1.20 ±0.11 volts.
9.
10. Re-adjust the oscillator frequency again to 12 kHz. The voltage measured across the input terminals should be 1.79 ±0.12 volts.
6
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