SX-SW77
42
1
2
3
4
1
2
3
4
C
D
F
A
B
E
S TEST
U TEST
6. Failures
• Depending on the types of errors, one of the following error messages will be displayed when the unit is turned on:
E E P
E R R
O C
E
R
R R O
8. Accumulated power-on time display and speaker setting display
• If the AUDIO INPUT key on the main unit is held pressed for 8 seconds while the power is on, the accumulated power-on
time display and the speaker-setting display will be alternately switched at intervals of 3 seconds.
7. DSP error display
• Each time the SOUND key on the remote control unit is pressed while the power is on, the DSP error display and the normal
display are alternately switched.
• Power-on time is always counted while the power is on, regardless of unit's functions and operations.
However, it is not counted during Standby mode.
• The maximum countable power-on time is 255H59M (255 hours 59 minutes.) The indication will not advance beyond that.
• The accumulated power-on time basically cannot be cleared.
• If "OC ERROR" is not displayed when the unit is turned on in Normal mode, short-circuiting of the speaker terminals
can be suspected.
• If "OC ERROR" is displayed again when the unit is turned on in Normal mode, the following causes can be suspected:
1. One or more of the ICs among the three digital amplifier ICs (IC3201, IC3301, and IC3401: TAS5122DCA) on the
MAIN Assy is in failure.
2. The line between one of the above digital amplifier ICs and the speaker terminals is short-circuited.
3. The XSD line from one of the above digital amplifier ICs to the system-control IC (PDC128A) is short-circuited by
grounding or is broken.
O V E R
P
T E M
• If "OVERTEMP" is not displayed when the unit is turned on in Normal mode, the unit is normal.
(It is likely that this was a temporary temperature rise, lower the volume of the speakers.)
• If "OVERTEMP" is displayed again when the unit is turned on in Normal mode, the following causes can be suspected:
1. One or more of the ICs among the three digital amplifier ICs (IC3201, IC3301, and IC3401: TAS5122DCA) on the
MAIN Assy is in failure.
2. The OTW line from one of the above digital amplifier ICs to the system-control IC (PDC128A) is short-circuited by
grounding or is broken.
1. Breakage or short-circuiting of the communication line to the EEPROM can be suspected.
2. A failure in the EEPROM can be suspected.
Speaker-setting display
At intervals of 3 seconds
T A L L
S P
Accumulated power-on time display
1 0 H 3 0 M
Test Mode connecting point
MAIN ASSY
A
SIDE B
Connecting point
