Tip & How-To about Music

A) basically it has to be acted upon by a supply voltage of at least 95V to work. sample picture

A) basically it has to be acted upon by a supply voltage of at least 95V

to work.

sample picture









b) of course, assuming the horizontal deflection oscillator works, same

with the horizontal drive and horizontal output transistor








it would generate output voltages on the secondary terminals

and 200V line will be active sending voltages to the

Video Drive circuits. Of course high voltage will be generated

ranging to at least 30 KV and there will be voltages on the G2 of the tube.


c) the easiest test point to look when it is oscillating, is the CRT heater

voltage, the heater lit when flyback is good ( mostly at night times when it

is dark ) and you can hear sounds, too.

here is a sample image





marked with letter H and H1

Green Arrow for the G2 voltage


d) having a B+ voltage reading of 75 V or lesser ( primary pins )

indicates a bad or partially shorted flyback, assuming your

horizontal output transistor and power supply are good & OK.

sample of H out




These only applies to CRT type TV's.

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How do u check pcb board on musical equipment and on other equipment the only tool i have to check is a Fluke Multimeter but is there any other stuff that is need to inspect and Diag. these boards ple


One of the first things a technician does with a voltmeter it to check 'all the voltages' in a system are correct..

Even without a specific circuit diagram for the board, 'Applications Notes' for chips and seminconductors will give nominal expected voltages in a working circuit.

Remember you can burn out the meter by connecting it to any source of current when on the Ampere or Ohm settings.
Technicians usially start at a high (highest) Voltage range setting and work downwards..

Providing the maximum Voltage is not exceeded on any range, whether it is AC or DC will not damage the meter.

'Fluke' by the way are a 'top end' professional product - check the price ;)



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