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- May 7, 2013
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This is the original thread.
I decided to start a new thread because the scope of the mod has exceeded the duplication of the AMC-4.
Heres what the FR-7 after the mod:
<ATTACHMENT filename=FR7Mod_01.jpg index=0>
You can see (from left): MIDI out, MIDI in, 24VDC jack, and (2) charging jacks. I need 2 jacks for charging because there are 3 wires: positive, negative, and temperature sensor. I have considered other connectors (e.g. 1/4 stereo connector) but finally decided on using 2 power jacks. The two charging jacks, besides being color coded, are of different sizes to eliminate the chance of reverse polarity. Initially I didnt plan to add the MIDI in connector, but adding it didnt really take much additional time, I did it anyway.
Heres the accordion with the 24VDC adapter. It is a used copy of the Canon CA-CP200 (24V, 2.2A), abundantly available from eBay for about $10. During testing the FR-7 with a bench power supply, I found supply current rarely exceed 0.4A and never go above 0.5A. The Canon adapter, rated at 2.2A, is more than sufficient.
(Note that the plug of the Canon adapter is positive-center. But I made a mistake in the harness and decided that it was simpler to fix that mistake by reversing the plug of the adapter).
<ATTACHMENT filename=FR7Mod_02.jpg index=1>
For charger, I decided on the Tenergy 12-24V 0.5A charger. It will take a long time to fully charge the Roland 4.5Ah battery pack. But I normally charge the battery when its low (not necessarily exhausted), and leave it charged overnight anyway. The battery can be charged inside (with the adapter cable) and also outside of the accordion (plugged directly to the charger).
<ATTACHMENT filename=FR7Mod_03.jpg index=2>
Heres what the battery compartment looks like. The harness electrically sits between the battery and the accordion. Physically, except for the connectors visible in the battery compartment, the harness resides inside the accordion. The additional connectors make the battery compartment very crowded and thus closing the battery cover is a bit fussy. But I dont expect to mess around with the battery cover very often.
<ATTACHMENT filename=FR7Mod_04.jpg index=3>
I havent been able to eliminate the FCB-7 yet. But I think I can from now on leave it home most of the time.
I decided to start a new thread because the scope of the mod has exceeded the duplication of the AMC-4.
Heres what the FR-7 after the mod:
<ATTACHMENT filename=FR7Mod_01.jpg index=0>
You can see (from left): MIDI out, MIDI in, 24VDC jack, and (2) charging jacks. I need 2 jacks for charging because there are 3 wires: positive, negative, and temperature sensor. I have considered other connectors (e.g. 1/4 stereo connector) but finally decided on using 2 power jacks. The two charging jacks, besides being color coded, are of different sizes to eliminate the chance of reverse polarity. Initially I didnt plan to add the MIDI in connector, but adding it didnt really take much additional time, I did it anyway.
Heres the accordion with the 24VDC adapter. It is a used copy of the Canon CA-CP200 (24V, 2.2A), abundantly available from eBay for about $10. During testing the FR-7 with a bench power supply, I found supply current rarely exceed 0.4A and never go above 0.5A. The Canon adapter, rated at 2.2A, is more than sufficient.
(Note that the plug of the Canon adapter is positive-center. But I made a mistake in the harness and decided that it was simpler to fix that mistake by reversing the plug of the adapter).
<ATTACHMENT filename=FR7Mod_02.jpg index=1>
For charger, I decided on the Tenergy 12-24V 0.5A charger. It will take a long time to fully charge the Roland 4.5Ah battery pack. But I normally charge the battery when its low (not necessarily exhausted), and leave it charged overnight anyway. The battery can be charged inside (with the adapter cable) and also outside of the accordion (plugged directly to the charger).
<ATTACHMENT filename=FR7Mod_03.jpg index=2>
Heres what the battery compartment looks like. The harness electrically sits between the battery and the accordion. Physically, except for the connectors visible in the battery compartment, the harness resides inside the accordion. The additional connectors make the battery compartment very crowded and thus closing the battery cover is a bit fussy. But I dont expect to mess around with the battery cover very often.
<ATTACHMENT filename=FR7Mod_04.jpg index=3>
I havent been able to eliminate the FCB-7 yet. But I think I can from now on leave it home most of the time.