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SUPPLEMENTARY INFORMATION
About the UB1 test mode
This test mode is used to confirm operations from the SWITCH MODE and SELECT switches up to the micro
computer (IC4 HD6433641RB15H).
Test mode operation
While pressing down on both foot switches, turn on the power. (Plug in the DC power plug). All LEDs will flash 4
times and the test mode will then be engaged.
Points to be confirmed
SWITCH MODE
LATCH:
Confirm that the ON/OFF LED lights (red)
UNLATCH: Confirm that the MODIFY LED lights (green)
SELECT
ADD LOWER 4th: Confirm that the INPUT LEVEL LED lights (green)
SOLO:
ADD UPPER 5th: Confirm that the INPUT LEVEL LED lights (red)
• To cancel the test mode, unplug the DC power plug.
Confirm that the INPUT LEVEL LED lights (yellow)
SERVICE MANUAL
3
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