Where can I get a circuit schematic for a Commax DRC-4BA door intercom unit? Commax in Korea are not helpful.

Before somebody can help you you need to give us both the make and model number. You have the unit and know what it is, we don't.

Its transmetter section may damagae...repair the pcb circuit

Sounds like a programming error, contact an IT Professional

Yes> You can go to M&S's website and contact them directly or try to match up that particular model and order a replacement. If its more than 5 years old, chances are you may have to buy an entire new system kit, (they like to changes things up up every so often like everyone else). As far as the problem your having goes, very common! The head- main unit is fried and non repairable as far as willing participants go... Also check EBAY. I have had tons of luck finding replacement parts of all types there. Hope this helps

you just said where everything goes, so what's the question?
connector 5 goes to your gat actuator, 6 is power for the unit, obviously there will be 2 wires for each for a complete circuit.

Schematic SHOULD be located either on the back of the dishwasher itself, like a decal........ or under the front door panel (the sheet metal panel which covers the front of the door), remove he front cover and take a look there, manufacturer usually applies schematic via a decal on each unit to assist field service technicians. PLEASE NOTE>>>>> DISCONNECT / SHUT OFF POWER TO UNIT PRIOR TO SERVICING!!!!! (Turn OFF Circuit Breaker) Hope this Helps You find it! GOOD LUCK!

http://www.commax.com/eng/support/manual-interphones-intercoms-commax.asp

I might be able to help.  I have an exutone intercom amplifier as well and I was looking all over for schematics for a while.  Then I decided to open the thing up.  To my amazement a schematic was glued to the bottom plate inside the chassis.  Other than that if you know the model number perhaps we have the same one, in which case I can scan mine and send it to you.

Have the same problem with PCB COMMAX CL-70MA 060125. Has anyone discovered if this board can be purchased? Does anyone have a schematic of the board?