Sony PFM-42B2 Service Manual page 50

1. Apply AC 100 VAC-240 VAC to CN61 of switching regulator
Applied voltage
2.
_
3.
3.3 V between PFC go
(CN7 pin-!/ and GND)
4.
3.3 V between 26 V ON
(CN9003 pin-8 and GND)
5.
3.3 V between Vcego
(CN7 pin-8 and GND)
6.
3.3 V between Vcego
(CN7 pin-8 and GND)
7.
1.00 V between Vrs
(CN7 pin-!] and GND)
and 3.3 V between Vsago
(CN7 pin-6 and GND)
8.
Set the Va load to 1.0 A.
9. Change the Vrs and Vra in the range of .05 V to 2.0 V and check to see that the Vs and Va output
voltage remain in the variable range.
If not, repeat the adjustment from step 7.
Vs and Va output voltage variable range
Vrs, Vra Vs (V)
75 ± 1.9 %
0.5 V
80 ± 1.9 %
1.0 V
90 ± 1.9 %
2.0 V
APS-179 board
RV150
1
RV102
1
RV202 PH107
RV270
CN9004
RV203
C122
1
CN9001
RV201
RV101
1
CN9002
PH101
PH111
CN9003
RV950
1
RV860
1
RV801
PH902
RV803 RV861
1
1
1
RV802
1
RV901
CN23
CN6 CN7
2-28
Output voltage location
St-by 5 V (CN9002 1-2)
PFC (C112)
26 V output voltage
(CN9003 pin-1 and GND)
Vcc (5 V) output voltage
(CN23 pin-3 and GND)
A13.5 V output voltage
(CN9001 pin-7 and GND)
Vs output voltage
(CN23 pin-8 and GND)
Va output voltage
(CN23 pin-1 and GND)
Iak (CN7!;-GND)
Va (V)
40 ± 3.0 %
50 ± 3.0 %
70 ± 3.0 %
Q504
1
1
C112
Q113
B side mount
Q302
Q108
1
Q704
Q504
CN61
A SIDE
ADJ Specification
5.05 ±0.05 V
RV203
385 ± 2 V
RV301
26 ± 0.1 V
RV201
5.18 ±0.02 V
RV270
13.8 ±0.02 V
RV202
RV802 Fully counterclockwise
79.6 ±0.05 V
RV801
80 ± 0.1 V
RV802
RV803 Fully counterclockwise
48.0 ±0.05 V
RV860
50 ± 0.1 V
RV803
0.60 ±0.01 V
RV861
PFM-42B2/42B2E