Juno 60 VCA BA662 Voltages

[Waimana]

Hi

I have two dead voices (channels 4 & 5) on my Roland Juno 60 and have tracked them down to the VCA's and BA662 IC's with the help of the Roland Service Manual

Have checked IC & Tranny voltages without signals and found two suspect BA662's (see voltages below), and would like some feedback on 'where to next' in terms of getting the voices back.

IC19 - BA662 (channel 5)
1 0v
2 0v
3 0v
4 0v
5 -15v
6 -0.03v
7 -0.03v
8 -0.01v
9 14.9v

IC22 BA662 (channel 4)
1 -14.5v
2 0v
3 0v
4 0v
5 -15v
6 0.2v
7 0.2v
8 8.67v
9 14.9v

Voltage on Pin 1 of IC 19 is not compatible with the other working voices

Pins 7 & 8 on IC22 are also not compatible with the working voices. Am also getting radio frequency on pins 8,7 & 1 on IC22

Overall power supply voltages for the Juno check out ok

Are these BA662's gone? and if so, any ideas for replacement parts?

Any help much appreciated, Cheers

Andrew

[frequencycentral]

BA662 are available on Ebay I believe, though you'll pay a pretty penny. However, there is nothing BA662-based that cannot be built using CA3080 as a replacement, I have built many BA662 based VCA and VCF using CA3080. It's not a drop-in, as BA662 are SIL and CA3080 are DIL, but providing you observe the correct pinout.....There were two versions of the BA662, the Juno VCA uses BA662A.

[Waimana]

Thanks for the advice, cheers!