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Switching Regulator (aps-132m Board) Adjustments; Preparation; System Minimum Frequency Adjustment; Vs System Minimum Frequency Adjustment - Sony PFM-510A1WU Service Manual

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3-6. Switching Regulator
(APS-132M Board) Adjustments

3-6-1. 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
Output
Pin No.
CN4 1 pin
VCC
CN5 2 pin
VS
CN5 5 pin
VA
CN6 3 pin
AUDIO +B
CN7 2 pin
STBY +5V
CN7 5 pin
5VD
CN7 8 pin
6.2V
CN7 != pin
13.5V
CN7 !] pin
13V
3-6-2. 13V 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.
3-6-3. VS System Minimum Frequency
Adjustment
1. Short between 3 and 4 pins 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.
3-12
MIN
MAX
1.0 A
5.0 A
0.5 A
1.7 A
0.5 A
1.5 A
0.05 A
1.0 A
0.2 A
0.3 A
1.2 A
1.8 A
0.6 A
1.0 A
0.5 A
1.0 A
0.4 A
1.0 A
3-6-4. VA System Minimum Frequency
Adjustment
1. Short between 3 and 4 pins 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.

3-6-5. 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 1 and
2 pins).
4. Adjust the RV300 so that the voltage across C115 is
385 ± 2 V.
3-6-6. 5V 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 1 and 2 pins) is 5.12 ± 0.03 V.
3-6-7. 13.5V 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 1
and 2 pins).
4. Adjust the RV250 so that the voltage of 13.5 V output
(between CN7 != and !- pins) is 13.7 ± 0.05 V.

3-6-8. VS Adjustment

1. Open the load on VS and VA outputs, and set the load
on the other outputs to the minimum.
2. Apply 100 V AC.
3. Turn the STBY signal ON (short between CN7 1 and
2 pins), and also the VRR signal ON (short between
CN4 7 pin and CN7 2 pin).
4. Apply 0 V DC to the VRS (CN4 3 pin).
Use CN4 4 pin as GND.
5. Adjust the RV402 so that the voltage of VS output
(between CN5 2 and 6 pins) is about 149 V.
6. Adjust the RV400 so that the voltage is 149.2 V.
7. Adjust the RV402 so that the voltage is 150 ± 0.1V.
8. Apply 2 V DC to the VRS.
9. Check that the voltage is 170 ± 0.3 V. If the measured
value is out of the range, repeat the above steps from 4,
where in step 6, shift the adjustment value a little, then
check the voltage.
PFM-510A1WU/PFM-510A1WE

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