Self Diagnosis Function; X-Ray Protector Operate; High Voltage Circuit No Operate; Deflection Circuit No Operate - Mitsubishi Electric DPro930SB-BK Service Manual

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
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 off(0.5sec)
LED orange on(0.5sec)
"LED blink" will be repeated from a moment that CPU detect an abnormal condition to power switch is
turned off.
LED Blink
LED orange on(2sec)
6-15