Question about Bose Wave Radio
I have an AWR1-1W that won't power up, makes a loud pop when unplugged. I know the fix for the newer version of this radio is the 5vdc power supply transistor. This is the older version with the 3 AA batteries for back up not the 9VDC battery. Do you have any suggestions. I can't even find the 5vdc supply in this radio, do you have a schematic. I have schematic for the series III of this radio but not the older version. If you can offer some info I'd appreciate it. Thanks
Q401 is listed as a Sanyo 2SC4695. It is marked "WT." It should be on the
bottom of the main board, on the side with the terminals that accept
the battery springs (this applies only to units with the three "AA"
backup batteries, board numbers 177171 and 179551 AFAIK).
With the board upside down in front of you, the battery terminal end (with the "W" shape) should be on your left. Near the middle peak of the "W", slightly towards the front, the third transistor from the left edge of the board should be Q401, adjacent to test point M30 (the +5V supply), as well as R405 and test point Z27.
Note that the test points are just normal board vias with labels, they have no special shape or size to help you identify them. :(
If there is no +5V on test point M30, but the +12V supply on nearby test point M32 is OK, Q401 may be bad. I have successfully used an Infineon BC817 NPN AF transistor in the SOT23 package as a replacement for the original 2SC4695.
Posted on Jan 14, 2010
Check the fuse, 2 see the voltage on the radio and finally check your electric closet.
Posted on Mar 14, 2008
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Posted on Jan 02, 2017
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