Hello,
I have a vintage 1981 audio analyzer from the Netherlands. It uses a custom CRT monitor that I do not have access to.
I want to test the pins on the monitor plug and determine if they are providing a good signal. The device turns on, fan starts, I can detect voltage on the various internal cards.
Inside the computer there are 3 pins that go from the "Graphics card" to a DB-15 plug.
These are the white/blue/yellow wires on the bottom of the photo:
These 3 wires to go a DB15 plug on the back of the computer labeled CRT MONITOR.
When I attach my DMM ( 388-HD ) to the 3 pins that are attached to the card, I get
PIN1: .3VAC (.06VDC ) .120 Khz
PIN2: .03VAC (.00VDC )
PIN3: .04VAC (.00VDC )
1) What would appropriate voltages be?
2) Am I able to measure these using my DMM ( I read that low HZ signals could be problematic )
3) Aside from plugging in a matching CRT, is there anyway to determine some basic level of functionality?
Any help appreciated!
I have a vintage 1981 audio analyzer from the Netherlands. It uses a custom CRT monitor that I do not have access to.
I want to test the pins on the monitor plug and determine if they are providing a good signal. The device turns on, fan starts, I can detect voltage on the various internal cards.
Inside the computer there are 3 pins that go from the "Graphics card" to a DB-15 plug.
These are the white/blue/yellow wires on the bottom of the photo:
These 3 wires to go a DB15 plug on the back of the computer labeled CRT MONITOR.
When I attach my DMM ( 388-HD ) to the 3 pins that are attached to the card, I get
PIN1: .3VAC (.06VDC ) .120 Khz
PIN2: .03VAC (.00VDC )
PIN3: .04VAC (.00VDC )
1) What would appropriate voltages be?
2) Am I able to measure these using my DMM ( I read that low HZ signals could be problematic )
3) Aside from plugging in a matching CRT, is there anyway to determine some basic level of functionality?
Any help appreciated!
