Sky PDS4250, Service Manual, Page: 50 / 62

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Adjustment
Fig. 9 Y Set-up Wave form
Fig. 10 Z ramp Wave form
3-5. Adjustment after Assembling (PDP Module Adjustment)
3-5-1. 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 PDP42V5####
Module after taking the Vs, Va, 5V voltage
- Voltage stability of power supply : Within 1% for Vs/Va, within 3% for 5V
3-5-2. Connection diagram of measuring instrument and setting up the initial voltage
(1) Connection diagram of measuring instrument Refer to Fig 8. (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:190V But,
Initially setting up voltage can be changed by the set up range according to the Module s
characteristic.