Hitachi SM0063 Service Manual page 54

(2) Adjusting Vset-down Voltage Wave form
Turn the VR2 of Y-SUS PCB and make the "B" wave form
Fig. 2 to be 150!5µs.
(Fig. 2) Y, Z set-up Waveform
(3) Adjusting the Voltage Wave form of Vramp
¤ Connect oscilloscope Probe to the B37 Pin on Z PCB
and the GND.
¤ŁTurn the VR3 of Z PCB and make the "C" wave form Fig.
3 to be 7µs.
But, in case of not setting up the Test point, produce
same output and adjust wave form connect to other
pattern or parts which has no possibility of short.
(Fig. 3) Z ramp Waveform
5. Adjustment after Assembling
(PDP Module Adjustment)
5-1. Using Tools
(1) Digital oscilloscope : More than 200MHz
(2) DVM(Digital Multimeter): Fluke 87 or similar one
(3) Signal generator: VG-825 or similar one
(4) DC power supply
- DC power supply for Vs (1) : Should be changeable more
than 0-200V/ more than 10A
- DC power supply for Va (1) : Should be changeable more
than 0-100V/ more than 5A
- DC power supply for 5V (1) : Should be changeable more
than 0-10V/ more than 10A
- DC-DC Converter Jig (1) : The Jig which has voltage
equivalent output of PDP42V6#### Module after taking
the Vs, Va, 5V voltage
- Voltage stability of power supply : Within !1% for Vs/Va,
within !3% for 5V
5-2. Connection diagram of measuring
5-3. How to Adjust
Z B/D Waveform
- 7 -
instrument and setting up the initial
voltage
(1) Connection diagram of measuring instrument
Refer to figure 1. (Connection diagram of measuring
instrument that adjusting the voltage wave form)
(2) Setting up the initial voltage
Initially setting up voltage : Vcc: 5V, Va: 65V, Vs: 185V
But, Initially setting up voltage can be changed by the set
up range according to the Module's characteristic.
(1) Adjusting initial voltage wave form
Check the voltage wave form like the mentioned way on
the 4-3(How to adjust) and readjust the wave form when it
is wrong.
(2) Checking the DC/DC pack voltage
¤ Convert the signal of signal generator to the 100% Full
White signal
¤Ł Connect the GND terminal of DVM to the R30's right leg
of the Y B/D and set the Plus terminal to the left leg of
R30 to check the Vscw voltage(115!1V) and when there
is abnormality in voltage turn the variable resistor(VR5)
of DC/DC Pack(Vscw) on Y B/D to adjust.
¤Ø Connect the GND terminal of DVM to the R31's right leg
of the Y B/D and set the Plus terminal to the left leg of
R31 to check the -Vy voltage(-75!1V) and when there is
abnormality in voltage turn the variable resistor(VR6) of
DC/DC Pack(-Vy) on Y B/D to adjust.
¤Œ Connect the GND terminal of DVM to the R27's right leg
of the Y B/D and set the Plus terminal to the left leg of
R27 to check the Vsetup voltage(200!1V) and when
there is abnormality in voltage turn the variable
resistor(VR4) of DC/DC Pack(Vsetup) on Y B/D to
adjust.