Mitsubishi Electric Diamond Pro 930SB, Руководство по обслуживанию

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6-15
LED off(0.5sec)
LED orange on(0.5sec) LED orange on(2sec)
12. SELF DIAGNOSIS FUNCTION
This monitor has SELF DIAGNOSIS function as below table, when turn on monitor, please check LED blink
times.
12.1 X-ray Protector Operate
On this condition, please check around T301 (FBT).
U701 detect pin 3. Normally this pin is low level.
When operate X-ray circuit, U701 pin 3 become high level.
12.2 High Voltage Circuit No Operate
U701 detect pin 15. Normally this pin is high level.
When operate this function, U701 pin 15 become low level.
Please check T301, Q305, Q304, Q306, Q303, U301.
12.3 Deflection Circuit No Operate
U701 detect pin 1. Normally this pin is low level.
When operate this function, U501 pin 17 output high DC level, so U701 judge that deflection circuit no
operate. This condition is two cases.
One is really no operation of deflection circuit. Please check deflection output such as Q313, Q314 and
DC-DC PWM circuit such as Q504.
The other is X-ray protector operation of U501 pin 2. In this case, please check around T301.
12.4 Beam Protector circuit Operate
U701 detect pin 13. Normally this pin is high level.
When operate this function, U701 pin 13 become low level.
12.5 Internal I2C bus line is abnormal
U701 check I2C bus line pin 9, 10.
When operate this function, U701 can not communicate some I2C bus semiconductor.
There are U702, U501, U202, U201.
LED Indicator
Contents of Information LED Blink
X-ray protector operate
High voltage circuit no operate
Deflection circuit no operate
Beam protector circuit operate
Internal I2C bus line is abnormal
Notes:
“LED blink” will be repeated from a moment that CPU detect an abnormal condition to power switch is
turned off.