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Again needing help fixing Orion HCCA 225 Digital Reference
Again needing help fixing Orion HCCA 225 Digital Reference
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Old 18th June 2018, 04:37 AM   #101
Chopperbuilder is offline Chopperbuilder  United States
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Join Date: May 2018
Location: St. Louis
I just bypassed as much of the trace as possible (see pic) and the voltage remains at -2.5v. I'm thinking we have something else causing the problem.
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Old 18th June 2018, 07:37 AM   #102
Perry Babin is offline Perry Babin  United States
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That's not bypassing. It's running in parallel. To bypass, you'd have to lift terminal 5 of the opto-coupler. Lift the two resistor legs and run a wire from terminal 5 to those resistors with no connection to the board.
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Old 18th June 2018, 07:46 AM   #103
Chopperbuilder is offline Chopperbuilder  United States
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How is it not bypassing when the trace has been cut? As marked by the two arrows. That whole section of trace has been eliminated from the circuit.
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Old 18th June 2018, 07:55 AM   #104
Perry Babin is offline Perry Babin  United States
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You had good voltage with the opto disabled. The opto-coupler simply drives the votlage through that trace. So the voltage is being dragged up by something.

Don't connect at the point where the 1M resistor and cap are. Go from pin 5 directly to the resistors.
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Old 18th June 2018, 07:05 PM   #105
Chopperbuilder is offline Chopperbuilder  United States
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Are you are meaning to disconnect the jumper wire from here(see pic)?


I did that and voltage is reading -5.0v
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Old 18th June 2018, 09:56 PM   #106
Perry Babin is offline Perry Babin  United States
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If you remove the jumper, do you get -15v on pin 5 of the opto-coupler?

Do you have pin 3 of the muting transistors in the square solder pad?

With no jumper, what id the DC voltage on the following:
1M resistor and capacitor?
Square pad of the muting transistors?
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Old 18th June 2018, 11:50 PM   #107
Chopperbuilder is offline Chopperbuilder  United States
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With jumper removed I'm getting -5.5v on pin 5 of the opto-coupler.


All 3 of the muting transistor are still out of the board.


Can you attach a pic showing me the location of the 1M resistor and capacitor?
Voltage reading on the square pad of the front two muting transistor is 0.0v. Voltage on the one by the transformer is -5.5v.
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Old 19th June 2018, 12:33 AM   #108
Perry Babin is offline Perry Babin  United States
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What is the DC voltage on pin 4 of the opto-coupler?

Is the 270 ohm resistor back in the circuit to enable the opto-coupler?

Yellow arrows, cap and resistor. Green arrow, the solder joints where you connected the jumper at the midpoint.
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Old 19th June 2018, 03:19 AM   #109
Chopperbuilder is offline Chopperbuilder  United States
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DC voltage on the 1M resistor and capacitor is 0.0v


DC voltage on pin 4 of the opto-coupler is -5.5v (Pin 5 was -6.5v).


Yes, the 270 ohm resistor is back in the circuit and enabling the the opto-coupler.
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Old 19th June 2018, 03:22 AM   #110
Perry Babin is offline Perry Babin  United States
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lift the 270 ohm resistor again to see if you get -15 on pin 4 of the opto-coupler.
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