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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.
XR-A660, XR-A330
Recording Adjustment
(1) Bias Oscillation Frequency Adjustment
Step Mode Input Signal/ Test Tape Load the STD-632 test tape and set the recording mode. Adjusting Points Deck II DECK I    L2801 (AF Assy) Measurement Points    Between A point in Fig.7 and GND. Adjustment Value Oscillation frequency to be 105.0kHz ± 2kHz. Remarks If the REC/STOP button for four seconds while the power is in STAND BY mode, the frequency will decrease 2 to 3 kHz.
1
REC
(2) Recording Bias Adjustment
� Since this adjustment affects recording bias, prevent distortion from increasing due to underbias.
Step Mode Input Signal/Test Tape Input a 315Hz signal to the AUX terminal and set the input selector to AUX. Adjusting Points Deck II DECK I Deck II DECK I    Input signal level    VR2801(Lch) VR2802(Rch) Measurement Points TAPE TEST POINT (L, Rch) (AF Assy) TAPE TEST POINT (L, Rch) (AF Assy) Adjustment Value Remarks
1
REC
� 23.7dBV
2
Load the STD-632 test tape and REC � record/playback the 315Hz and PLAY 10kHz signals. (see the Note below)
Repeat adjustment until playback level of the 10kHz signal is within 0 ± 0.5dB from that of the 315Hz signal.
Note : Set the 10kHz input signal level to the same value as the 315Hz input signal level of step 1.
(3) Recording Level Adjustment
Step Mode Input Signal/Test Tape Input a 315Hz signal to the AUX terminal and set the input selector to AUX. Adjusting Points Deck II Input signal level DECK I Deck II DECK I    VR2301(Lch) VR2302(Rch) Measurement Points TAPE TEST POINT (L, Rch) (AF Assy) TAPE TEST POINT (L, Rch) (AF Assy) Adjustment Value Remarks
1
REC
�
7.7dBV
2
Load the STD-632 test tape and REC � record/playback the 315Hz PLAY signal.
Repeat recording, playback and adjustment until playback level of the 315Hz signal becomes � 7.7dBV.
(4) ALC Operation Check
Step 1 2 REC/ PAUSE Mode Input Signal/Test Tape Input a 315Hz signal to the AUX terminal and set the input selector to AUX. Adjusting Points Input signal level Set to a level +10dB adove the input level at step1. Measurement Points TAPE TEST POINT (L, Rch) (AF Assy) Adjustment Value � 8.2dBV Confirm that the reading is � 2.2 ± 2.5dBV. Remarks
56
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