Roland V-Accordion FR-8x Service Notes page 41

Connect the Battery Pack NIMH UL2054 4,5A SANYO.
Keep the [CHARGE] button pressed as long as the red LED remains lit steadily.
The display shows:
Verify that all the results of PRE-CHARGE test are "OK".
Press the Treble register [14] to start the battery charge.
Verify that all the results of CHARGE test are "OK".
Press the Treble register [14] to pass on to the next test.
FR-8X/XD
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