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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 Adjustments
1-2 Cassette Deck
1-2-1 To Adjust Tape Speed
Notes 1) Measuring tape: i)(Tapes recorded with 3kHz) MTT-111 (or equivalent) ii) MTT-5512 (or equivalent) 2) Connect the cassette deck to the frequency counter as in figure 1-4.
SPK OUT output Figure 1-4 Cassette Deck Frequency Counter
1-2-2 To Adjust PlayBack Level
Notes 1) Before the actual adjustment, clean the play/recording head. 2) Measuring tape : i) MTT-114(or equivalent 10kHz AZIMUTH control) ii) MTT-112(or equivalent) : 3) The cassette deck is connections as shown in figure 1-6.
Recording /Play head
AZIMUTH control screw Figure 1-5
SET
SPK OUT
VTVM
Oscilloscope
Step
Item
Pre-Setup Condition OUT
Pre-Setup 1) Deck 1:MTT-111 2) Press PLAY SW button 3) Deck 2:MTT-5512
To Adjust
Standard
Remark
(GND)
! Adjust Deck 1 Play Level
Turn URV1 to left and right FRONT PCB 3KHz Step Item Pre-Setup Condition SPK OUT (VTVM is 1 AZIMUTH connected to the scope) Pre-Setup After putting MTT114 into Deck 1 1)Press PLAY button. To Adjust
Figure 1-6
In Out
1
NOR SPEED Control
(connected to the frequency counter)
Standard Max output and same phase (both channels)
Remark After adjustment secure it with REGION LOCK.
1) Turn the control screw to as shown in Figure 1-5.
Adjust REC Bias Voltage
Step Item REC Bias Voltage Pre-Setup Condition Connect to DCW2 as in Fig.1-7 and read the VTVM. Pre-Setup Input MTT-5512 into Deck2,then press REC button. To Adjust L-CH;DSR2 and R-CH;DSR1 to the right and left. Standard Remark See diagram for adjustment location
@ Adjust Deck 2 Play Level
Step 1 Item AZIMUTH Pre-Setup Condition SPK OUT (VTVM is connected to the scope) Pre-Setup After putting MTT114 into Deck 2 1)Press PLAY button. To Adjust 1) Turn the control screw to as shown in Figure 1-5. Standard Max output and same phase (both channels) Remark After adjustment secure it with REGION LOCK.
1
6V
VTVM SET
Oscilloscope
IN
UCW2
Figure 1-7 Samsung Electronics 1-3
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