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TROUBLESHOOTING & REPAIR
LOW VOLTAGE CIRCUIT TEST (continued)
FIGURE F.14 – CONTROL BOARD LEDs
LED2
LED1
LED3
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CONTROL BOARD LED DEFINITIONS
LED1: (Red) This light indicates that 18 VAC is being supplied to the control board from the auxiliary transformer. It also shows that the 18 VAC is being rectified and should be regulated to +15 VDC. This +15 VDC supply is used to power the circuitry on the control board.
LED2: (Red) This light indicates that the +5.5 VDC is present. This voltage is derived from the +15 VDC supply. The +5.5 VDC supply is used to power the circuitry on the control board.
LED3: (Red) This light indicates that 18 VAC is being supplied to the control board from the auxiliary transformer. It also shows that the 18 VAC is being rectified and should be regulated to
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FIGURE F.15 – DISPLAY BOARD TEST POINTS
L10721 DISPLAY BOARD
(REAR VIEW)
J 40
15 | 1 |
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