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I spent $300 for the thing 10 yrs ago, then paid$125 for a display repair, now its crapping out repetitively and I refuse to pay ungodly sums to repair it again only to have the next thing fail in a few yrs. So, I plan to gut mine and convert to a speaker dock for my iPhone - small mini-amps are under $50 now. I plan to leave the speakers in the case since they are properly ported and sound great as is. I'll pull the speaker wires out the back and mount the amp on top - might not look pretty but it'll work just fine and some of these little amps have FM tuners, SD card readers and remotes. won't be as elegant but it'll sound good.
I recently posted a problem with a cambridge soundworks 730 which had a display problem with unreadable characters and/ or ALL of the controls would lock up after being on for 1-2 hours and could be fixed temporarily by unpluging and then pluging back in Luckily I was able to find another display board and that took care of the problem and eliminated the tuner board and the power supply board in the back as possibilities. there are several chips on this board so a service manual would be necessary to pinpoint this particular problem or a replacement board from the manufacturer OR buy a broken one on ebay that does not have the same symptoms and make one good one out of two and you will also have extra parts.BE CAREFUL WITH THE RIBBON CABLE WHEN YOU REATTACH IT TO THE DISPLAY BOARD its a little tight and must be pushed back in evenly.It might be easier to take the whole radio apart and disconnect it from the tuner board which is a straight run whereas on the display board end its at an awkward angle
To the left of the display are two buttons, engraved "1" and "2". (Note, I'm NOT referring to the buttons for radio presets, which are below.)
Hold either of these buttons for a second or two to enter alarm set mode. The screen prompts will prompt you to set the time for the alarm to go off using the time set buttons to the right of the display. You can also press one of the radio preset buttons or the AUX or CD buttons to wake to one of those. Once you're done setting the alarm, quick presses of these alarm buttons turn the alarm on and off and choose between music and beeper.
As a side note, if you've installed the backup battery and the power fails during the night, the alarm will still go off with the beeper so you're not late for work -- a thoughtful touch from Cambridge Soundworks.
See my answer to cd740 sound cutting out. Fuse is inside near the transformer. You'll need to disassemble. There is a good write up for a question about getting to the faceplate. Briefly, there is a sub base that has screws hidden behind the rubber feet pads which peel off easily. The front speaker grills PPP off easily and it hides some screws. The rear plate also has to come off. Check those other questions, the answers will help.
I believe the problem is either a faulty light sensor the unit has to dim the display when the lights dim since it was designed for bedroom use with alrms and snooze button. or it is simply a failure in the circuit that drives the LCDs. Mine has been dim for a long time but I can still see just enough to adjust the sound settings. I tune and set stations by sound. so the display has not been an issue since we do not use it for a clock or alarm. I doubt there is a fix for the dim display.
Mine is dim also. Apparently sending it in for repair is not an option.
Unfortunately, the CD740 radio has reached end of service life.
Parts are no longer available & we cannot repair them. We apologize
for any inconvenience. If you need further assistance, please call us
at -800-367-4434, Monday - Friday 9AM to 6PM central time.
-- Best Regards,
I just had the same problem and called tech support (800) FOR HIFI at Cambridge Soundworks for help. All you have to do is unplug the radio for 30 minutes and then reconnect - kind of like rebooting a computer.