Page 1
ANALYSIS-REPAIR FLOW CHART
Confirm claim information
F1: CERAMIC FUSE 50CT063H Replacement parts
(Including preventive replacements)
PKG1 RC1: RBV-1506
R2, 3, 4: A53K-220J 5W 22
ohm J
Q1, 2: 2SK2915
R10,11: BPR58 5W 0.02
ohm K
R3, 4, 5, 6: AK53K-220J 5W 22
ohm J
R10, 11: BPR58 5W 0.02
ohm K
Z1: L4981A
PKG2 Q15, 16: 2SK2641-01
R64: RSMF2SL 0.22 ohm J
R66, 69: RSMF12T 22 ohm 1/2W 22 ohm J
R65, 68: RSMF12T 47 ohm J 1/2W 47 ohm J
RX10: CR21TR680J
R76: CR21TR101J
R77: CR21TR101J
R75: CR21TR331J
Z2: SMA-Z1001A
Q19, 20: 2SK2698
R84: RSMF2SL 0.22
ohm J
R85, 88: RSMF12T 47 ohm J 1/2W 47 ohm J
R86, 89: RSMF12T 22 ohm J 1/2W 22 ohm J
RX13 CR21TR390J
R96: CR21TR101J
R97: CR21TR101J
R95: CR21TR181J
Z3: SMA-Z1001A
Q22, 23: 2SK2641-01
R102: RSMF2SL 0.33
ohm J
R104, 106: RSMF12T 10 ohm J 1/2W 10 ohm J
R109: CR21TR152J
RX14: CR21TR821J
PKG3 Z4: SMA-Z1001A
PKG3 R108: CR21TR471J F1 Open
RC1: Rectifier
R2, 3, 4, 5: Anti-collision
resistor
Q1, Q2: Main FET
R10, 11: Gate resistor
Q15, 16: Main FET
R64: Protection resistor
R66, 69: Gate resistor
Q19, 20: Main FET
R84: Protection resistor
R86, 89: Gate resistor
Q22, 23: Main FET
R102: Protection resistor
R104, 106: Gate resistor
Z5: Control IC
1-4pin, 12-14pin
R119: Protection resistor
R119: RSFM2SL 0.68 ohm J
R133: CR21TR222J
RX16: CR21TR271J
PKG3 Z5: SMA-Z1001A
PKG3 R132: CR21TR331JNO
YES 2
1 Input filter section
PFC circuit
+5V system circuit
+12V system circuit
+5V, +/-15V system circuit
+48V, +20V system circuit
No abnormality
1
2
Page 2
AC power supply input
Confirm outputImplement unable-to-recreate
test items
Confirm the start-up condition of each
output voltage using OSC.
(Overvoltage protective operation, yes/no)
Completely
no output
Check PFC circuit operation
Investigate PFC circuit
Stop after momentary
oscillationFET Vds H levelIntermittent
oscillation Confirm main operation
waveform (refer to page 4)Detection of circuits
not outputting
Abnormal
wave form
Secondary side output
circuit investigation Inspect whether or not there
is output terminal shorting of
the secondary side output circuit Operation of protective
circuit, mis-operationControl IC Vcc voltage
level YESNG
YES
+/-15A,+/-5A +48, +20, +12A +12DT V
0V
+5D, +5LED
No output of 1
systemRated
voltage Overvoltage detection
1
3 4 5
+/-15A,+/-5A
Q23 D-S+48, +20, +12A
Z5 14-12+12D
Q20 D-S+5D, +5LED
Q16 D-S
C15: Output terminal
voltage (380V)
Overvoltage operation ALM
Z1 Vcc voltage level L
3
