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The service was quick and simple, finding the service manual easy and it appears to be the original with colour schematics. It contained the info I was after and so sorted the problem.
I have copied it to CD and attached the envelope to the inside back cover of the owners manual. Good manual and excelent service. Robin Wood, Wood Electronics, New Zealand.
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Exactly what was needed to assess the product - excellent value and great service
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Nice to have the service manual for the Sony DCR-TRV345E now. The document is of excellent quality.
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MACKIE HR824 26 pages English-only Service Manual contains:
1) HR824 technical overview with the description of front and rear panel switches.
2) HR824 specs
3) Block Diagram
4) Wiring Diagram
5) Packaging management
6) Spare part & final assembly list (for PCB rev A and B) + exploded view
7) Test Procedures (where, how to measure voltage...) including Test Point diagram on the PCB.
8) IC and Transistor charts.
Excellent guide: very clear, good scan quality enabling us to print readable diagram :-)
Note:
Mackie HR824 make extensive use of surface mount devices (SMD). Service on the HR824 must
only be undertaken by experienced service technicians with the right tools, experience and patience to perform surface mount rework when needed.
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This Service manual is very well scanned and its clean to read, no any anti-theft words that un-english could understand. I got my CCD600 working with this manual and it´s clear shematics :)
7615 Adjustments page 19
Troubleshooting Tips
The Power Supply Circuit
When the set is turned On, the Main Switch Mode power supply is turned On. This supply produces the +130 volt,+32 volt,-32 volt, two +15 volt, and Audio supplies. When IC 7302 develops a normal steady state operation, the 130 volt supply is sampled by resistors 3324,3323,and 3322. This sample voltage is then sent to Shunt regulator 7303 which drives the feedback optoisolator 7303.The feedback voltage on Pin 14 is then compared with an internal 2.5 volt reference by comparator "C". Comparator "C" then sets the reference voltage on the inverting side of comparator "B" to control the On time of the drive at Pin 3.If the voltage on Pin 14 increases due to the 130 volt supply increasing, the On time of the pulse on Pin 3 will be reduced. If the 130 volt supply decreases, the voltage on Pin 14 would decrease, causing the On time of the pulse on Pin 3 to increase. This is used to keep the 130 volt supply at the correct voltage. Variable resistor 3322 is used to adjust the 130 volt supply to the correct level. The overvoltage protection circuit of the IC will shut the IC down if the VCC level on Pin 1 exceeds 17 volts. To troubleshoot this circuit, first check the On/Off line from the Small Signal Panel to ensure that it is going Low. Then check for the presence of startup voltage on Pin 1 of the regulator IC 7302.If the IC is working correctly, this voltage will be changing from 9.4 to 14.5 volts. If the startup voltage is not present, check the startup resistor 3300 and the bridge rectifier. If the voltage on Pin 1 is changing, check the drive signal on Pin3.Then check for signal on the gate and drain of 7301.An excessive load on the secondary, a short on the 130 volt line for example, would cause the supply to pulse with little or no voltage on the secondary.
Picture problems
Picture too dark or too bright Press �Smart Picture� button on the remote control. If this improves the picture, increase / decrease the brightness value or increase / decrease the contrast value. Enter the Customer Service Mode. If this improves the picture, exit Customer Service Mode, then Increase / decrease the brightness value or increase / decrease the contrast value. White line around picture elements and text Press �Smart Picture� button on the remote control. If this improves the picture, decrease the sharpness value. Enter the Customer Service Mode. If this improves the picture. Decrease the sharpness value. Snowy picture Snow is an antenna or antenna connector problem. Check tuner and AGC. Black and white picture Press the �Smart Picture� button on the remote control. If this improves the picture, increase the color value. Enter the Customer Service Mode. If this improves the picture. Increase the color value. Menu text not sharp enough Press the �Smart Picture� button on the remote control. If this improves the picture, decrease the contrast value. Enter the Customer Service Mode. If this improves the picture. Decrease the contrast value. Sound problems No sound or sound too loud (after channel change / switching on) - Enter the Customer Service Mode. If the volume is OK, increase / decrease the volume level.
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