Toshiba MMU-P0121H Service Manual page 103

3-6-5. 7 Segment Display Function
3-6-5-1. Outdoor unit 7 segment display (Interface P.C. board)
A 7 segment LED to check the operation status is provided on the interface control P.C. board. The display
contents can be selected by combining the set up numbers of the rotary switches (SW01, SW02, and
SW03) on the P.C. board.
7 segment
display A
2 1
position position
Check Procedure when Emergency Stop has Occurred
When the system stopped due to an error of the outdoor unit, check the following items.
(1) Open panel of the inverter outdoor unit, and check the 7 segment display.
A check code is displayed at the right side of the 7 segment display.
[U1] [nn] (nn : Check code)
(Switch set up when checking the check code : SW01 [1], SW02 [1], SW03 [1])
(2) Confirm the check code, and implement check operation according to the Troubleshooting guide for each
check code.
(3) If [U1] [d2] are displayed on the 7 segment display, an error occurs on the fixed-speed outdoor unit.
Push the push-switch SW04 of the inverter outdoor unit for several seconds. Only the outdoor fan in
which error occurred operates, open the panel of the unit of which fan operated, and check the check
code displayed on the 7 segment.
(4) Implement check operation according to the Troubleshooting guide for each check code.
7 segment
display B
2 1
position position
3-100
CPU
SW04
SW05
SW08
SW03 SW02 SW01
D716 D717 D714 D715
7segmentLED 7segmentLED
(A) (B)