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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.
SECTION 4 MECHANICAL ADJUSTMENTS
1. PRECAUTION Clean the following parts with a denatured-alcahol-moistened sweb : Playback head Pinch roller Rubber belt Capstan Demagnetize the playback head using a demagnetizer. Do not use a magnetized screwdriver for adjustments. After adjusting, apply screw-locking compound onto the adjusted parts. Unless specified otherwise, use a specified voltage (1.3V) to perform the adjustments. 1. 2.
SECTION 5 ELECTRICAL ADJUSTMENTS
PRECAUTION Specified voltage : 1.3V Switch position MENU button : a NR light off (OFF) : AVLS light off (OFF)
2. 3. 4. 5.
TAPE SECTION
Test Tape Type WS-48A
0 dB=0.775 V
Signal 3kHz, 0dB
Purpose Tape Speed Adjustment
Torque Measurement Mode FWD FWD Back Tension REV REV Back Tension FF REW CQ-102RC CQ-102C Torque meter Meter reading 20 to 30 g · cm (0.28 to 0.42 oz · inch) 0.4 to 2.0 g · cm (0.0056 to 0.028 oz · inch) 20 to 30 g · cm (0.28 to 0.42 oz · inch) 0.4 to 2.0 g · cm (0.0056 to 0.028 oz · inch) More than 40 g · cm (More than 0.56 oz · inch)
set
Tape Speed Adjustment Procedure :
Test tape WS-48A (3kHz, 0dB) 16� Frequency counter
+ � 2 REMOTE jack (J701)
1.
CQ-201B
Playback WS-48A (Tape center part) in the FWD state and adjust RV601 so that the frequency counter reading becomes 3,000 Hz.
Specification Value: Digital frequency counter 2,970 to 3,030 Hz 2. Playback WS-48A (Tape center part) in the REV state. Check that frequency counter reading is within 60 Hz of the reading of step1.
Adjustment Location : [MAIN BOARD] � SIDE A �
RV601 : Tape speed
�7�
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