lanar opti 7001d

[tech guy]

im repairing a lanzar 7k. im trying to locate the values of d4 d5 d3 d2 d1.
they all have shorted and no markings on them. they are located on the ps card.

 

[Perry Babin]

Lanzar will sometimes provide diagrams and other information. Call or email them tomorrow if no one has a definitive answer.

 

[barber02]

The one I have in the shop doesn’t have any markings on them either. Those appear to be ESD clamping diodes for the logic IC CD4070BE and tests as standard diode as far as forward voltage. I’d image a standard 4148 would do the job. According to the data sheet a CMOS protection network is used on the inputs of that chip.

Probably not much help, but two cents none the less.

 

[barber02]

Here is a picture of the card that the OP is asking about.

 

[barber02]

This is the back side of the card. The 4 diodes are at the top right. You can see that the Cathodes of D4, D5, D3, D2 are all tied together just before connecting to pin 2 of the IC and then goes over to pin 12 of the IC.