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Category: Philips

Philips Videopac G7000/22


 

 

As with all aging electronic equipment and capacitors, it was time to give my G7000/22 internal PSU a maintenance. The G7000 operates on +5V and the original PSU output between 7.2V to 8.2V unloaded. Even though I documented the capacitors, I decided a replacement +5V SMPS would be a better choice.


 
Replacement +5V SMPS, a reversible modification.
 

The G7000 can be modified to output composite video with a COMPOSITE VIDEO MOD V2.1 by The Future was 8-bit. This is a G7000 / 22 model with internal powersupply.

I (re)used the original cable which goes from the main PCB to the RF-modulator box.

 

 
Turn the potentiometer to adjust the brightness.
 

Main board

 

 


 
 

Memory expansion


 


 
 

Tape PCB

 

 


 

The Philips 2000T has a RGB monitor port and RF-signal but is lacking a Composite Video signal. The P2000M version had an additional 80-column card for use with a monochrome composite monitor.

 


With a COMPOSITE VIDEO MOD V2.1 from The Future was 8-bit it is possible to get color composite output.
 

A 90 degree pin header mounted in the two first holes, thick red and blue cables can be omitted, those just pass the signal further to the RF-modulator. The cable going to the RF-modulator is disconnected, just wanted to have the original functionality available if needed.

 



As a normal precaution, I disconnected the motherboard from the PSU and when powering it up, every fuse on the board blew. All three large capacitors were shorted.
 

The large capacitors have 4 legs, middle pin is positive (+) and the outer ring legs are negative.
 

Positive pin marked with red, and negative pins marked with green.
You can replace these with a standard 2 leg radial capacitor (r=11), just make sure the negative planes have continuity.
 

After a full recap and replacing the rectifier bridge (with better specs to run cooler) the PSU powered up and gave stable +5/+12/-20V.

 

Wires from the transformer to the PSU PCB were brittle and snapped off just by touching them.
 


New solder, shrinking tube and a zip-tie to the rescue.