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Accuphase A-48S

@imhififan 

Here are photos for rear of 3 boards you specified:

A-48S (7).JPG

A-48S (8).JPG

A-48S (9).JPG

I will appreciate very much if you would provide information on them.

Thank you in advance.

 

foolishman
imhififan's avatar
imhififan
2,258 posts
 

I have some free time tonight, so let’s discuss some details on how to connect the transformer to 240V.

  1. Remove all the six transformer primary winding wires from the circuit board.
  2. Use a multimeter to perform a continuity test to confirm which wires belong to which primary winding.
  3. Connect the transformer primary winding wires as shown below.

 

foolishman OP
80 posts
 

@imhififan 

Regarding converting 100V to 230V, I also would like to know how to convert voltage of C-2300.

Here are links of images:

C-2300_1 (1).JPG

C-2300_1 (2).JPG

C-2300_1 (14).JPG

C-2300_1 (15).JPG

I will appreciate very much if you would provide information.

Thank you in advance.

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imhififan's avatar
imhififan
2,258 posts
 
imhififan's avatar
imhififan
2,219 posts
 
 
 

@foolishman 

Because of I don't have the preamp on hand, I can only assume it's a 100V, 120V and 230V multi-tap power transformer. The voltage settings are as follows:

J1, J4 = 100V

J2, J5 = 120V

J3, J6 = 230V

However, according to the brochure of C-2300, it is marked as 120V, 220V, 230V AC (voltage is shown on the rear panel). If so, connecting J1 and J4 will be 120V, connecting J2 and J5 will be 220V, and connecting J3 and J5 will be 230V. Please post your findings, thank you.

foolishman OP
80 posts
 

@imhififan 

Thank you very much for the information you provided. Regarding voltage on the rear panel, I will check and let you know.

Meanwhile, do you think it is OK to change only connecting J3, J6? Or do I need to change other boards like the sub-transformer board?

Thank you in advance.

 

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