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Very quality copy of original service manual, which contains the circuit diagrams, PCB and lists of components, well as recommendation for calibration procedures of device, also everything else, that need for repair, tuning and use this oscilloscope.
All presented copies have high-resolution, so you can view all in detail.
This manual will very useful for simple owners and for repairers.
I recommend these manual, because myself is owner of Philips PM3216 and I need sometimes servicing these oscilloscope (principally calibrating).
Also, these document is an example of excellent design of technical documentation.
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Excellent printing quality.
A complete and very usefull service manual with all details.
GREAT SERVICE AT VERY LOW PRICE!
A+++++++++++++++++++++++++
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manual excelente completo , diagramas y esquemas bien presentados y buena calidad de imagen.
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muy buen manual completo de buena calidad de impresion preciso y detallado , muy útil para la reparación.
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The service manual is a good quality scan of the Panasonic NV-850, which is electrically identical to the Philips VR 6920, but mecanically just nearly.
Power Amplifier TROUBLESHOOTING
SYMPTOM No audio (POWER LED is off) No audio (PROTECT LED flashes every 4 sec.) No audio (PROTECT LED is on) LIKELY CAUSE No voltage at BATT+ or REM terminals, or bad or no ground connection DC voltage on amplifier output SOLUTION Check voltages at amplifier terminals with VOM Amplifier may need service; see enclosed warranty card for service information Make sure amplifier cooling is not blocked at mounting location; verify speaker-system impedance is within specified limits (see �Specifications� on the next page) Check vehicle charging system for defective voltage regulator Check INPUT LEVEL setting; see previous page Check vehicle charging system for defective voltage Check INPUT LEVEL setting; or check speaker wires for shorts or grounds Remove speaker leads one at a time to locate shorted speaker or wire, then repair Check speaker connections for proper polarity
PX300.4
Amplifier is overheated
No audio (PROTECT and POWER LEDs flash) I-E/OPT LED is on all times (not flashing) No audio (PROTECT LED is on) Distorted audio
Voltage less than 9V on BATT+ connection
Amplifier is being overdriven Voltage more than 16V or less than 8.5V on BATT+ connection regulator Input sensitivity is not set properly, or amplifier or source unit is defective Short circuit in speaker or wire
Distorted audio and PROTECT LED flashes Music lacks �punch�
Speakers are not connected properly
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