Turns out this was not the manual i was looking for. The concertmate 670 keyboard i have is a "Realistic" model made for Radio Shack and none of the diagrams on the owners manual i received matches up. HOWEVER, I must say the service Owners Manual provides was fast and efficient by being available online. The manual was in good readable condition and easily downloaded.
Thank you for your manual It has the basic things to and i use the Oszi for Longer Time.
THX
Text excerpt from page 4 (click to view)
Mains On/Off Switch � This switch turns
the system power on or off. The switch illuminates to indicate the presence of AC power present in the chassis. This switch is prior to the fuse. The switch light can be on even if the fuse is blown The light in the switch may flicker depending on local voltage conditions. This is normal and nothing to be concerned about
Ground Lift Switch � This switch lifts the
ground within the balanced output system to allow you to eliminate excessive noise when connected to external systems.
Stereo Aux. Input - The standard ¼
mono jack is designed to accept the signal from an external source such as a CD or cassette player, drum machine, synth. module, etc. The signal is summed prior to the master volume control. The signal enters the system before the tone controls. These jacks can also be used to return a studio cue signal, allowing the Time Traveler to provide you with your own headphone mix in the studio.
Speaker On/Off Switch- This switch
turns off the loudspeaker out put jacks .
REAR PANEL FEATURES
Combination Power Cord Jack and Fuse Holder � The removable power cord
is attached here. Pulling the holder out of the top of the power inlet accesses the fuse carrier. Your unit was shipped with a spare fuse inserted in the fuse carrier. USE ONLY THE SAME SIZE AND TYPE FOR REPLACMENT. Models come with a holder marked (FUSE) they are factory configured for 100/120/ 230/240 only and must be adapted by a service tech for any voltage change. The standard fuse for U.S. use is (5) Amp slow blow or time delay.
Amplifier Break Link-These are provide
to break the signal chain at the input to the amplifier. This can be used as an insert point or control point for the final amplifier
Tuner Out Jack � This standard ¼ inch
jack is designed to provide a pre-gain signal for connection to a tuner. It can also be used to provide pre-tone signal to other devices such as a direct box or console. The signal is 2X input.
Do not use fast blow fuses.
Amp Outs � These consist of two ¼ inch
jacks and a NL-4 connector. The jacks are wired in parallel. The total speaker load impedance should not exceed 4 ohms.
Cooling System � Your amplifier features
a thermostatically controlled fan, which will switch on when the internal temperature reaches 130 degrees F. In low volume situations (into 8 Ohm loads) the fan may not come on at all. The system also features a high temperature thermal safety system which will activate an AGC circuit if the operating temperature goes above 190 degrees F. This circuit will automatically turns down the output of the system in the event of overheating. It will automatically reset itself to full power as soon as the unit cools down to a safe operating temperature. Usually it takes from 2 to 5 minutes before the unit will begin to operate normally again. (Note: the D.I. will continue to operate normally even when the amplifier is in thermal shut down. Only the stage sound will be lost.)
Mono Pre Tone Effects Se nd/Return � These standard ¼ jacks allow you to send and receive your signal to and from external devices. The effects loop is positioned post (behind) the compressor before the enhance control and the tone section. Recording Out � This fully balanced XLR
output allows you to send a pre or postEQ/pre-master signal to a recording or sound reinforcement mixing console. This output is designed to allow use with phantom powered systems.
D.I. Level � Controls the level being sent
from the XLR balanced output jack.
