AFC1
6
4. < -5V system output voltage > (Circuit diagram CN2)
Procedure
Item Measured
(1)
Power supply switch ON
(2)
Check output voltage
No voltage output
(3)
Check input oscillation
waveform
Abnormal wave form
No voltage output
Abnormal wave form
No voltage output
Abnormal wave form
No voltage output
Check insertion of AC
harness.
Replace the following:
F1,Q1,ZD1,R3
Replace the following:
IC7,D20
Items Repaired
No abnormality
Replace the following:
IC3,Q2,D3,ZD2,R4
Replace the following:
IC1,IC2,Q3,Q4,R14,R16,
PR4
Voltage output
Items Confirmed
AC input
Is DC-4.5V ~ -5.5V being input?
(With dummy load)
Measurement point: Circuit Drawing 2/2“Point L”
Wave form measurement point: Circuit Drawing 2/2 “Point M”
(Refer to Fig. 6 for wave form sample. *6)
Normal wave form
Voltage output
Voltage output
Normal wave form
(4)
PFC circuit voltage
confirmation
Check wave form.
Is DC+370V ~ +400V being input?
Measurement point: Circuit Drawing 1/2 “Point A”
Wave form measurement point: Circuit Drawing 1/2 “Point B”
(Refer to Fig. 1 for wave form sample. *1)
Check PFC controller input
voltage
Check wave form.
Is DC+16V ~ +19V being input?
Measurement point: Circuit Drawing 1/2 “Point C”
Wave form measurement point: Circuit Drawing 1/2 “Point D”
(Refer to Fig. 2 for wave form sample. *2)
Voltage output
Normal wave form
(6)
Check AC input voltage
Is AC input voltage coming out?
Measurement point: Circuit Drawing 1/2 “Point E”
(5)
