CD Player malfunction when first turned on

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Bose Wave Radio AWR1-1W

The Bose Wave Radio AWR1-1W, also known as the Bose Wave Radio I, was released in 1993. A countertop AM/FM radio system with a high performance stereo tuner and two independent alarms.

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smithron4 @smithron4

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Опубликовано: 8 фев 2019 г.

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CD Player malfunction when first turned on

I have disassembled the unit so that I can observe the CD player in action. There were sounds prier to disassembly that were unexplained. In operation, with observation, the carriage for the laser moves with a threaded shaft. The purpose is to keep time with the advance of the recorded data. The whole mechanism is jumping back and forth erratically for a few seconds. Then briefly the CD will work correctly followed by more erratic movement. Left alone this jerking and momentary playing will continue for thirty to forty minutes. After this period the CD unit will play normally until the whole unit is turned off for several hours. Is this a circuit problem or a mechanical problem with the player itself? What would cause either problem. If it is mechanical, can the CD player be fixed or, if not can I buy a replacement? If it is a circuit problem, what approach to debug the circuit controlling the CD operation could you suggest?

The Bose is a Model AWRCC1 that plays one CD at a time, reducing the complexity of the player. Rather than a player that holds several disks and change disks internally.

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Hi,

Have you tried gently cleaning the laser lens with Isopropyl Alcohol 90%+ to see if this resolves the problem?

8 фев 2019 г. из jayeff

I cleaned the laser lens and there was no difference.

14 фев 2019 г. из smithron4

The answer only brought me part of the way. I need some more information from Abrsvc

smithron4

19 фев 2020 г. из smithron4

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Hi,

Have you tried gently cleaning the laser lens with Isopropyl Alcohol 90%+ to see if this resolves the problem? — jayeff
The answer only brought me part of the way. I need some more information from Abrsvc

smithron4 — smithron4

Abrsvc @abrsvc Репутация: 4,1к ABR Services 3 2 · Answer 1 · 2019-02-15T06:02:10-07:00

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Abrsvc @abrsvc

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Since this unit “works” as expected after a warm-up period,I would first look for any poor solder connections around the motor control IC. If I recall correctly, there should be two ICs marked BA6209 or BA6219 (most common for units of this vintage) that are the motor drivers. When playing a CD, there are two movements that take place to provide continual reading of the disc. First is the lens itself that changes angle to read the track (fine movement) followed by the motor rotating the shaft to physically move the optics assembly (gross movement). Both of these happen somewhat simultaneously to give a smooth movement overall to read the disc in a spiral fashion.

From what you are describing, the CD system gets lost and the gross movement from one end to the other over the disc is to locate its last position from which it will continue. This can happen for a few reasons. I suspect that the gross movement is not controlled correctly which is causing the optics to overshoot the track. When this happens, the system will “re-calibrate” by going to each extreme and then locate the correct track. Since this seems to recover and stop happening once the unit has been working for a while, either there are poor connections at the control IC or the IC is defective. Try re-soldering the connections first. If that does not resolve the problem, replace the driver IC and try again. Update this with the results.

Dan

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The problem is that the unit I have does not use the same designations on thje IC's or the location I am looking is the wrong one. I need some clarification. If I take pictures, can Dan or someone tell me were the bad solder joints may be found.

Ron

2 фев 2020 г. из smithron4

Sure. Also check the capacitors in the power supply area. If these are weak, there may be some AC fluctuation on the 12V power line that will interfere with proper motor IC function. Sometimes capacitors will "fix" themselves once warmed up.

2 фев 2020 г. из Abrsvc

I need to communicate with Abrsvc or Dan , the one who answered about the bad solder joints. That is the most likely answer and I need some clarification about the location of the IC in question. I have been unable to find the components he named.

Please write back. I only just found this and though it is a year old I still would like to get it fixed.

smithron4

19 фев 2020 г. из smithron4

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Linda McCormick @lindamccormick Репутация: 1 · Answer 2 · 2024-02-06T15:27:06-07:00

Linda McCormick @lindamccormick

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I find that my CD player in the Bose Wave must be warmed up for about five minutes. Then it plays normally. I do not understand this problem but I can live with it rather than discontinue using CD's.

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Curiously Motivated @curiouslym86159 Репутация: 1 · Answer 3 · 2024-02-06T23:25:17-07:00

Curiously Motivated @curiouslym86159

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There is a wealth of knowledge here. https://jestineyong.com/audio-restoratio...

Main premise is capacitors age and go out of tolerance. I suspect maybe a few in power supply stages would cause erratic behaviour. (don't need to replace them all) China blesses us with low cost ESR meters if high end gear is out of reach. This video was useful https://www.youtube.com/watch?v=snuJdw60.... (maybe play at 2x speed and skip as necessary)

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Bose Wave Radio AWR1-1W

CD Player malfunction when first turned on

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