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Heathkit IO-4510 dual trace oscilloscope, help on faults.

Hello.

Please would you advise on where to start looking for the following faults on my Heathkit IO-4510 dual trace 'scope:

1.   right hand section beam not present.

2.   Left hand section beam present but cannot be focused to a fine line.

Any suggestions will be greatly appreciated.  

Comments
Ferenc.P

Hello!
What have You check so far?
Do You have some measurement results from power-supply stage?

(Instruments and experience needs with HIGH VOLTAGE measurements around CRO Tube !)

Tips:
- In most case, cause of irregular focusing can be in wrong Tube biasing (please, check resistor divider
R601 thru R606)
- Do you have voltage (line thickness on display) change while adjusting ASTIG potmeter (R569)
- +195V(for ASTIG) and -1000V (stabilized), tensions are present?

Best Regards,
Feri

Sorry for grammar.

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