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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.
L70A Technical Service Manual
MC68HC705BD7B LM-2596
SIMPLE SWITCHER Power Converter 150kHz 3A Step-Down Voltage Regulator
General Description
The LM2596 series of regulators are monolithic integrated circuits that provide all the active functions for a step-down (buck) switchingregulator capable of drivinga 3A load with , excellent line and load regulation. These devices are available in fixed outputvoltages of 3.3V, 5V, 12V, and an adjustable output version. Requiring a minimumnumber of external components, these regulators are simple to use and include internal frequency compensation �, and a fixed-frequency oscillator. The LM2596 series operates at a switching frequency of 150 kHz thus allowingsmaller sized filter components than what wouldbe needed withlower frequency switchingregulators. Available in a standard 5-lead TO-220 package with several different lead bend options, and a 5-lead TO-263 surface mount package. A standard series of inductors are available from several different manufacturers optimizedfor use withthe LM2596 series.This feature greatly simplifies the design of switch-mode power supplies. Other features include a guaranteed+/-4% tolerance on output voltage under specified input voltage and output load conditions, and +/- 15% on the oscillator frequency. External shutdown is included, featuring typically80 A standby current. Self protection features include a two stage frequency reducing current limitfor the outputswitch and an over temperature shutdownfor complete protection under faultconditions.
Features
- 3.3V, 5V, 12V, and adjustable output versions - Adjustable version output voltage range, 1.2V to 37V 4% max over line and load conditions - Available in TO-220 and TO-263 packages - Guaranteed 3A output load current - Input voltage range up to 40V - Requires only 4 external components - Excellent line and load regulation specifications - 150 kHz fixed frequency internal oscillator - TTL shutdown capability - Low power standby mode, Q I typically80A - High efficiency - Uses readily available standard inductors - Thermal shutdown and current limitprotection
Applications
- Simple high-efficiency step-down (buck) regulator - On-card switching regulators - Positive to negative converter
Note: �Patent Number 5,382,918.
Typical Application
(Fixed Output Voltage Versions)
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