Sony BKM-V12, Service Manual

Page: 24 / 56

2-4
PFM-42X1/42X1N
3. How to adjust
1) Adjusting the voltage waveform of Vsetup
1
Connect the measuring instrument as shown in the
connection diagram Fig. 1.
2
Turn on the power of the measuring instrument as
described in
c
under Fig. 1.
3
Connect the oscilloscope probe to the P4 connect-
er (80-pin) of Y-SUS PCB and GND.
4
Turn the VR1 of Y-SUS PCB to adjust the
waveform “A” in the following figure to be 10
±
5
µ
s.
2) Adjusting the Vset-down voltage waveform
1
Turn the VR2 of Y-SUS PCB to adjust the
waveform “B” in the following figure to be 120
±
5
µ
s.
3) Adjusting the Vzb voltage waveform
1
Turn the VR2 of Z-SUS PCB to adjust the wave-
form “C” in the following figure to be 33
±
5
µ
s.
Y, Z set-up waveform
A 10 ± 5 u s
VSC: 110 ± 1 V
B 120
±
5
u
s
_ Vy: 175 ± 1 V
Vzb: 105 ± 1 V
140 u s
C 33 ± 5c u s
Vs
Vset-up = Vs
Z B/D waveform
2-3-5. Adjustment after Assembling (PDP
Module Adjustment)
1. Required Tools
1) Digital oscilloscope : 200 MHz or more
2) DVM (Digital multimeter) : Fluke 87 or equivalent
3) Signal generator : VG-854 or equivalent
4) DC power supply
. DC power supply for Vs (1) : Should be changeable
more than 0-200 V/ more than 10 A.
.
DC power supply for Va (1) : Should be changeable
more than 0-100 V/ more than 5 A.
. DC power supply for 5 V (1) : Should be changeable
more than 0-10 V/ more than 10 A.
.
DC-DC converter tool (1) : The tool that can output
the voltage equivalent to that of the PDF42x1##7#
module by using the Vs, Va, or 5 V voltage.
.
Voltage stability of the power supply : Within
±
1%
for Vs/Va, within
±
3% for 5 V.
2. Connection diagram of the measuring
instrument and setting up the initial voltage
1) Refer to fig 1. (Connection diagram of measuring
instrument that adjusts the voltage waveform).
2) Initial-setup Voltage : Vcc : 5 V, Va : 65 V, Vs : 190 V
Adjust the initial-setup voltage within the setup range
according to the module’s characteristics.
3. How to adjust
1) Adjusting the initial voltage waveform
Check the voltage waveform by following the steps in
2-3-4 (3. How to adjust), and readjust the waveform
when it is out of range.
2) Checking the DC/DC pack voltage
1
Switch the signal of the signal generator to the
100% Full White signal.
2
Connect the GND probe of DVM to the R16’s
right leg of the Y B/D, and connect the positive
probe to the left leg of R30 to check the V1st
voltage (115
±
1 V). When there is abnormality in
the voltage, turn the variable resistor PS1 of DC/
DC Pack (V1st) on Y B/D to adjust it.
3
Connect the GND probe of DVM to P4 of the Y
B/D, and connect the positive probe to the lower
leg of R37 (or R50) to check the Vsc voltage (115
±
1 V). When there is abnormality in the voltage,
turn the variable resistor (PS3) of DC/DC Pack
(Vsc) on Y B/D to adjust it.