G05-802 Deflection board question.

jkoolpe

Well-known member
Joined
Apr 21, 2005
Messages
2,563
Reaction score
765
Location
San Bruno, California
Also helping a guy with this Asteroids Deluxe.

I recapped his G05-802 monitor, and have a question about the deflection board:

Should pins 2, 3, and 4 from the 5 pin P701 connector (that connects to the yolk) be continuous?

My meter keeps reading them as continuous after the aforementioned recap was done and I had also reflowed the solder to all of the connectors.

I guess I should have checked before I did the latter, huh? But I don't want to power up the monitor until I know these pins are supposed to be continuous just to be safe :) .

Anyway, if anyone can check this quickly and LMK, that would be appreciated.

Jon
 
If I understand what you are asking. The Plug connected to the "Yoke" is reading a short between pins 2 and 3, then between 4 and 5?

Looking at the schematic, you should read basically a short on the plug coming from the "Yoke" between pins 1 and 2 (X), then between 3, and 5 (Y).


Also helping a guy with this Asteroids Deluxe.

I recapped his G05-802 monitor, and have a question about the deflection board:

Should pins 2, 3, and 4 from the 5 pin P701 connector (that connects to the yolk) be continuous?

My meter keeps reading them as continuous after the aforementioned recap was done and I had also reflowed the solder to all of the connectors.

I guess I should have checked before I did the latter, huh? But I don't want to power up the monitor until I know these pins are supposed to be continuous just to be safe :) .

Anyway, if anyone can check this quickly and LMK, that would be appreciated.

Jon
 
Are you checking continuity of the yoke coils (putting your meter probes into the connector housing)?

Or are you checking continuity on the PCB (putting your meter probes onto the pins of the deflection PCB, with the yoke DISconnected)?

Or are you checking continuity on the PCB (putting your meter probes onto the pins of the back of the deflection PCB, with the yoke CONNECTED)?

If it's the last of these 3, then they might all appear to be connected together. This is because the coils themselves have pretty low resistance, and each coil has one leg connected to ground on the PCB via a low value resistor (2 ohm, R620 & R720).
 
Last edited:
Thanks guys!

I was testing the continuity from the back of the board while it was disconnected from the monitor completely (board was on the table).

I keep getting continuity between pins 2, 3 and 4 on this connector (P701) when I test for it in this manner. From the schematics, it seems to me that I shouldn't have continuity between 2 and 3, but I'm not that experienced at reading schematics.

Jon
 
Back
Top Bottom