ok, R59 1M = 888
R60 1M = 1.025
R62 560K = 606
R63 220K = 348
Is R64 the switch ?
I can not find a R67
Yes, R64 is the pot.
I think the resistor numbers stop at R64 so no R67. That's my typo I meant R57.
Obviously some of the resistors have drifted, especially R63.
*** Remember to be careful around this area of the circuit and don't touch anything
while you are measuring.
The next step is to check if there's any CRT beam current.
- Turn on the unit and wait about 30 secs to 1 minute
- Turn the Intensity Pot to maximum
- Measure the voltages across R60, R62, R63
- Turn the Intensity Pot to minimum
- Measure the voltages across R60, R62, R63
After that you probably need to make a High Voltage Probe.
In order to determine the meter input impedance do the following:
- Set the multimeter to DC voltage
- Measure the voltage on say a 9V battery.
- Put a 10M resistorsin series with the +ve lead of the meter.
- Remeasure the battery voltage using the free end of the 10M resistor.
You should expect somewhere between 1V and 4.5V depending on your meter impedance.
I think Rob meant R57 which should be 3M3
Yes!