3-25
PFM-500A3WE/500A3WG/500A3WU/510A2WE/510A2WG/510A2WU
3-7. Switching Regulator
(APS-132 M/136 M Board)
Adjustments
3-7-1. Preparation
1.
Remove the switching regulator from the set, and
adjust it under no load.
2.
If adjusting the switching regulator with each output
loaded, set as follows.
.....
Load on each output
3-7-2. 13 V System Minimum Frequency
Adjustment
1.
Apply 18 V DC to both ends of C169.
2.
Connect a frequency counter between gate and source
of Q153.
Note : As the input of frequency counter, use 10 : 1 oscilloscope probes and
raise the input impedance.
3.
Adjust the RV150 so that the oscillation frequency is
93
±
0.5 kHz.
3-7-3. VS System Minimum Frequency
Adjustment
1.
Short between pin-3 and pin-4 of PH501.
2.
Apply 18 V DC to both ends of C169.
3.
Connect a frequency counter between gate and source
of Q503.
Note : As the input of frequency counter, use 10 : 1 oscilloscope probes and
raise the input impedance.
4.
Adjust the RV500 so that the oscillation frequency is
49
±
0.5 kHz.
3-7-4. VA System Minimum Frequency
Adjustment
1.
Short between pin-3 and pin-4 of PH701.
2.
Apply 18 V DC to both ends of C169.
3.
Connect a frequency counter between gate and source
of Q703.
Note : As the input of frequency counter, use 10 : 1 oscilloscope probes and
raise the input impedance.
4.
Adjust the RV700 so that the oscillation frequency is
65
±
0.5 kHz.
3-7-5. PFC Voltage Adjustment
1.
Set the load on each output to the minimum.
2.
Apply 100 V AC.
3.
Turn the STBY signal ON. (short between CN7 pin-1
and pin-2).
4.
Adjust the RV300 so that the voltage across C115 is
385
±
2 V.
3-7-6. 5 V Adjustment
1.
Set the load on each output to the minimum.
2.
Apply 100 V AC.
3.
Adjust the RV201 so that the voltage of STBY
+
5 V
output (between CN7 pin-2 and pin-6) is 5.12
±
0.03 V.
3-7-7. 13.5 V Adjustment
1.
Set the load on each output to the minimum.
2.
Apply 100 V AC.
3.
Turn the STBY signal ON. (short between CN7 pin-1
and pin-2).
4.
Adjust the RV250 so that the voltage of 13.5 V output
(between CN7 pin-12 and pin-11) satisfies the follow-
ing specifications.
Specification value
PFM-500A3W : 13.95
±
0.05 V
PFM-510A2W : 13.7
±
0.05 V
Output
Pin No.
MIN
MAX
VCC
CN4
1
pin
1.0 A
5.0 A
VS
CN5
2
pin
0.5 A
1.7 A
VA
CN5
5
pin
0.5 A
1.5 A
AUDIO
+
B
CN6
3
pin
0.05 A
1.0 A
STBY
+
5 V
CN7
2
pin
0.2 A
0.3 A
5VD
CN7
5
pin
1.2 A
1.8 A
6.2 V
CN7
8
pin
0.6 A
1.0 A
13.5 V
CN7
!=
pin
0.5 A
1.0 A
13 V
CN7
!]
pin
0.4 A
1.0 A
