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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.
Alignment and Adjustment
2-2 Tape Transport System Adjustment
When parts are replaced, perform the required adjustments by referring to procedures for the tape transport system. If there are any changes to the tape path, first run a T-120 tape and make sure excessive tape wrinkle does not occur at the tape guides. 1) If tape wrinkle is observed at the guide roller S, T, turn the guide roller S, T until wrinkle disappears. 2) If the tape wrinkle is still observed at the tape guide, perform the tilt adjustment of the ACE head. (See page 5-3 of the Service Manual for Test Point Locations.)
2-2-1(b) ACE HEAD TILT ADJUSTMENT
1) Playback a blank tape and observe the position of the tape at the lower flange of tape guide. 2) Confirm that there is no curl or wrinkle at the lower flange of tape guide as shown in Fig. 2-5 (B). 3) If a curl or wrinkle of the tape occurs, slightly turn the screw (A) tilt adjust on the ACE head ass�y. 4) Reconfirm the ACE head height.
(A) (B)
2-2-1 ACE Head Assembly Adjustment
2-2-1(a) ACE HEAD HEIGHT ADJUSTMENT
1) Run the alignment tape (Color bar) in the playback mode. 2) Observe surface of the audio head using a dental mirror. 3) Turn screw (C) clockwise or counterclockwise until the gap of lower tape edge and the lower edge of the control head is about 0.25mm. (Refer to Fig. 2-3 and 2-4)
WRINKLE
(BAD)
(GOOD)
Fig. 2-5 Tape Guide Check
2-2-1(c) AUDIO AZIMUTH ADJUSTMENT
1) Load alignment tape (Mono scope) and playback the NTSC : 7KHz (PAL : 6KHz) signal. 2) Connect channel-1 scope probe to audio output test point. 3) Adjust screw (B) to achieve maximum audio level. (See Fig. 2-3)
SCREW (A) TLIT ADJUST
SCREW (C) HEIGHT ADJUST
X-POSITION ADJUSTING SLIT SCREW (B) AZIMUTH ADJUST
SCREW (D) X-POSITION LOCKING
2-2-1(d) ACE HEAD POSITION (X-POINT) ADJUSTMENT
1) See page 5-1 of the Service Manual for ACE Head position (X-Point) adjustment.
Fig. 2-3 Location of ACE Head Adjustment Screw
AUDIO HEAD VIDEO HEAD
0 ~ 0 .25 mm CONTROL HEAD
Fig. 2-4 ACE Head Height Adjustment
2-2
Samsung Electronics
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