Galaxy dx99V2 off 4K on various channels

[Chris Lawrence]

Replaced both adder chips today. No change. Assuming these chips are correct - and based on the pin-outs, it appears it should do the job, it must be something else.

 

[Cable Guy]

Voltages of both adders and pll will help. There are resistor arrays that can give bad logic on the pins. Maybe even a capacitor array, but idk if your radio has them. I will need to check the schematic when I get home.

 

[Chris Lawrence]

Voltages of both adders and pll will help. There are resistor arrays that can give bad logic on the pins. Maybe even a capacitor array, but idk if your radio has them. I will need to check the schematic when I get home.

Input voltage or voltages of every pin? If all pins, does it matter which channel I’m on?

MC14008BCP PDF

Part #: MC14008BCP. Description: 4-Bit Full Adder. File Size: 225.3 Kbytes. Manufacturer: ON Semiconductor.

www.alldatasheet.com

 

[Cable Guy]

Input voltage or voltages of every pin? If all pins, does it matter which channel I’m on?

MC14008BCP PDF

Part #: MC14008BCP. Description: 4-Bit Full Adder. File Size: 225.3 Kbytes. Manufacturer: ON Semiconductor.

www.alldatasheet.com

Yes, voltages of all pins and on a determined channel. Channel 1 if you like.

 

[Cable Guy]

For ch1 band e, the pll program pins should be...
9 high
10 low
11 low
12 low
13 low
14 high
15 high
16 high
17 high

High=>5v, low=<2v
That gives the binary sum of 271..

Edited to correct.

 

[Cable Guy]

If IC7(IC5) pins match
2 lo
4 hi
6 hi
15 hi

And IC6(IC4) match
2 hi
4 lo
6 lo
15 lo

Then the diode matrix and subsequent band switch is ok. Maybe a bad channel switch.
Sorry if this seems confusing.

 

[Chris Lawrence]

If IC7(IC5) pins match
2 lo
4 hi
6 hi
15 hi

And IC6(IC4) match
2 hi
4 lo
6 lo
15 lo

Then the diode matrix and subsequent band switch is ok. Maybe a bad channel switch.
Sorry if this seems confusing.

Yes, it is a bit confusing for me. And I didn’t see this until after I got the voltages on channel 20 (which incorrectly reads 27.445). I’m going to post this. I hope the columns match up so it’s legible.
[edit ic labels—now correct]
IC4————-IC5
1- 0—————-0
2- 7.7—————-0
3- 7.2—————-8.2
4- 0—————-7.7
5- 8.2—————-8.2
6- 0—————-7.7
7- 8.2—————-8.2
8- 0—————-0
9- 0—————-0
10- 8.2—————-0
11- 8.2—————-8.2
12- 0—————-0
13- 8.2—————-0
14- 0—————-8.2
15- 0—————-7.7
16-8.2—————-8.2

 

[Chris Lawrence]

Should I provide other details?