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thanks a lot.
without the service manual my handycam was going to the trash.
good job, go on.
bye
 ;
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.
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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!
Power Amplifier
Reference 7520a/7521a
TROUBLESHOOTING
• PROBLEM: No audio (POWER LED is off). CAUSE and SOLUTION: No voltage at BATT+ and/or REM terminals, or bad or no ground connection. Check voltages at amplifier terminals with VOM. • PROBLEM: No audio (PROTECT LED flashes every 4 seconds). CAUSE and SOLUTION: DC voltage on amplifier output. Amplifier may need service; see enclosed warranty card for service information. • PROBLEM: No audio (PROTECT LED is on). CAUSE and SOLUTION: Amplifier is overheated. Make sure amplifier cooling is not blocked at mounting location; verify that speaker-system impedance is within specified limits. • PROBLEM: No audio (PROTECT and POWER LEDs flash). CAUSE and SOLUTION: Voltage less than 9V on BATT+ connection. Check vehicle charging system. • PROBLEM: No audio (PROTECT LED is on). CAUSE and SOLUTION: Voltage greater than 16V or less than 8.5V on BATT+ connection. Check vehicle charging system. • PROBLEM: Distorted audio. CAUSE and SOLUTION: Input sensitivity is not set properly, or amplifier or source unit is defective. Check INPUT LEVEL setting, or check speaker wires for shorts or grounds. • PROBLEM: Distorted audio (PROTECT LED flashes). CAUSE and SOLUTION: Short circuit in speaker or wire. Remove speaker leads one at a time to locate shorted speaker or wire, then repair. • PROBLEM: Music lacks “punch. ” CAUSE and SOLUTION: Speakers are not connected properly. Check speaker connections for proper polarity.
STATUS LEDs Clip: Indicates the amplifier is being overdriven, and your speakers may be in danger. This should blink only on musical peaks, and not be on constantly. Power: Indicates the amplifier is on. Protection: Refer to “Troubleshooting” for specific indications. Figure 15. LED status.
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