20 Most Recent Gemini Sound Products Gemini CDM 3600 Questions & Answers

I would go to radio shack or some electronics store and buy a can of compressed air that comes with a straw taped to the can. Plug the straw into the nozzle and open the CD drive and blow the air into it while moving it back and forth in the slot to blow as much dust as you can away from the laser head and surrounding areas. That should clean the laser head and allow it to read properly unless something is wrong with it. I would try that on any CD/DVD drive before any other steps. When they get dusty, they can't read.

You would have to get it to a service center. It could be the control or some supporting circuitry. If there is no service center near you. You can send it in to pro Line Music 215-736-8055

The CD transport needs to be replaced. If you can not get it done, you can send it in to Pro Line Music [email protected]

Typical problem is a little rubber belt that drives the tray carriage from a motor... it slips or deteriorates.

One of the first things a technician does with a voltmeter it to check 'all the voltages' in a system are correct.. Even without a specific circuit diagram for the board, 'Applications Notes' for chips and seminconductors will give nominal expected voltages in a working circuit. Remember you can burn out the meter by connecting it to any source of current when on the Ampere or Ohm settings. Technicians usially start at a high (highest) Voltage range setting and work downwards.. Providing the maximum Voltage is not exceeded on any range, whether it is AC or DC will not damage the meter. 'Fluke' by the way are a 'top end' professional product - check the price ;)

The most likely case is that one of the main output transistors (if which there are many) is shorted. When the protect circuit senses DC on the final output, it will not allow the output relay to come on to protect the speakers from raw DC. With the power removed, you can check between each outputs Emitter and Collector and you will probably find close to zero ohms. From that point you need to unsolder each of the pins of the bad channel until you find the shorted device(s) and replace them.

'pianoforte'

BREV. N. 838420

See page 22 troubleshooting of this manual. It may help you. dd501 (yamaha.com)

Depending on the model, there are four around that date, it could be the insert jacks are tarnished reducing the signal flow between the pre amp stage and digital power amplifier. It could be the power amplifier has failed. It could even be customer error in wiring. This assumes there is the correct level of signal entering the input sockets of course.