Thank you for the comment! I have a question. Based on the measurements of the inductance for each line, the following correlation was observed. Both the yellow and orange lines had a resistance of 3.5kΩ, which corresponds to 115v. Similarly, the brown and red lines had a resistance of 2.6kΩ, indicating they are intended for 100v. With this in mind, looking at the wiring in the photo of A70, it appears that the red (100v) and yellow (115v) lines are in parallel, suggesting a total of 215v. Following my line of thought, I assume that combining the orange (115v), gray (0v), and yellow (115v) lines would result in 230v. The orange line in the photo connects to a white line coming from a board with a relay. I believe it should be fine to replace the orange line with the red one, which is rated for 100v, according to my understanding. Would there be any issues if I were to swap the orange line with the red line based on my assumption? Also, I would greatly appreciate it if you could explain the significance of the white line coming from the board with the relay. With respect,
Accuphase A75 Voltage conversion 100v-230v
Hello, I would like to request advice regarding changing the voltage of Accuphase A75 from its Japanese 100V model to 230V. While I have experience with voltage conversions, this is my first time working on an A75 model, so your assistance is greatly appreciated.
The basic modification plan involves rewiring the main transformer wires in parallel, replacing the fuse with an 8A slow-blow fuse, and changing the relay jumpers from J1 and J3 to J2. I intend to include circuit photos for reference. I have already measured the resistance allocation of the main transformer wires using an LCR meter.
https://drive.google.com/drive/folders/1jEZNpgb04ZSw6yBU3Tum0yNrq4RdXZ6P?usp=sharing
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Orange - 120V Red - 100V Grey - 0V
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Yellow - 120V Brown - 100V White - 0V
To achieve 230V, I believe I need to connect Orange to Grey and Yellow together in parallel, leaving White as it is. If you have any advice or suggestions, please share them. Thank you!!
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My previous post was based on your measured result:
I should have been more specific: 100V 1 = orange, 2 = red+brown, 3 = yellow, 4 = white+grey, 5 = empty 120V 1 = red, 2 = orange+yellow, 3 = brown, 4 = white+grey, 5 = empty 220V 1 = orange, 2 = red, 3 = grey+yellow, 4 = white, 5 = brown 240V 1 = red, 2 = orange, 3 = grey+yellow, 4 = white, 5 = brown As you can see, there's actually no 230V setting! Depending on your country, you can set it to 240V (UK) or 220V (China).
Yes, this should not cause any problems.
It provide the required power to the soft-start board. When the power switch pressed in, mains voltage applied through two sets of ceramic resistors paralleled (J1,J3 in place for 100V/120V) or in series (Remove J1,J3 install J2 for 220V/240V) in order to reduce inrush current. After a few seconds, the relay turn on and bypass the soft-start resistors.
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I successfully changed the voltage of the A75! Thank you! Now, I will attempt to change the E380 to 230V. I have experience converting to 115V in the past, so I have a rough idea. Based on the photo of the power board, J1 and J3 correspond to 100V, J4 and J5 correspond to 115V, and J2 corresponds to 0V. In this case, for the 115V configuration, I will move the jumper from J1 to J4 and from J3 to J5, and that should be sufficient. https://drive.google.com/drive/folders/1dVlrJMGQGBO0BtF7u9xi2Ras_xYSasM0?usp=drive_link
For the 230V configuration, I anticipate that by moving the jumper from J1 to J4, removing jumpers from J2 and J3, and adding a jumper to J6, the transformer circuit will be parallelized for 230V. I will also change the fuse to 3.15A, and then I'll be finished. Regarding E-380 not having a soft start circuit or relays, could this be because the inrush current is not significant? Please provide advice. |
Yes, your jumper settings are correct! By the way, the two primary windings of 220-240V are connected in series , and the two primary windings of 100V-120V are connected in parallel.. 100V = J1,J2 and J3 115/120V = J2,J4 and J5 215/220V = J1 and J6 230/240V = J4 and J6
I don't have an E-380 and can't confirm if there is a soft-start board hidden in the chassis. However, transformers with low VA ratings can be operated without a soft-start circuit.
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