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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.
PCB MAIN
TEST MODE Wave ROM check MAIN: IC12, IC18
Procedure
1. Press and hold the two E keys shown below, and then turn on the power switch. 2. Select the POP GROUND sound. 3. Reduce the MAIN VOLUME level low enough.
When set to the self-diagnostic mode, the Wave ROM outputs a sine wa The Wave ROMs correspond to the keyboard keys as shown in the diagram to the right. When a key is pressed, the corresponding sine wa sound is produced. If no sound is produced, or if the sound is distorted the Wave ROM corresponding to that key is defective. This method allo to diagnose also the output routes (L/R) from the Wave ROM. -The key number indicates the Wave ROM number.
(I-1: IC12, I-2: IC18)
CPL CPR
Control Panel buttons Press and hold the two F keys shown below, and then turn on the powe LED lighting check switch.
Control Panel LED display check
Press the buttons on the control and confirm that the corresponding LE light. Press and hold the two G keys shown below, and then turn on the powe switch.
MKB
Keyboard ROM (IC1) check
The numbers are displayed automatically and repeatedly on the display Press and hold the two A keys shown below, and then turn on the powe switch.
If the keyboard ROM (IC1) is OK, only the TOUCH SENSITIVITY LIGHT L flashes. If it is defective, the LEDs (LIGHT and NORMAL, or LIGHT, NORMAL and HEAVY) flash.
9. PRECAUTIONS BEFORE SERVICING
9.1. Precautions for measuring of the output waveforms 1. The waveform was measured with a �National Digital Storage
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