Service manual

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VSP-C0486
3. Electric Specifications
3.1Deflections
Scanning Frequency 30 - 115kHz
Back Porch >=1.1 µsec
Blanking >= 2.0 µsec
Horizontal
H-sync Width >= 0.6 µsec
Scanning frequency 50 - 160Hz
V-sync + V-back Porch >= 400 µsec
V-sync Width 3H <= Vs <= 10H---over 50kHz (fh)
2H <= Vs <= 10H---up to 50kHz (fh)
Vertical
V-Total Line >= 256H + V-sync Width
(*) Full screen adjustment may not be available for the timing which
Tdh / Th < 72% - Over 100kHz (fh)
Tdh / Th < 74% - Up to 100kHz (fh)
Tdh: Horizontal Display Time
Th: Horizontal Scanning Time
3.2 Signal Input
Video Input Signal R.G.B analog
Sync. Input Signal
External composite sync. , Negative TTL
External HD/VD separate sync. TTL (N or P)
Video Input Impedance 75ohm to ground
Sync. Input Impedance 2.2kohm to ground
Signal Level
Video signal: 0.7V p-p + 10% / - 5%
Separate H/V-sync. : TTL level (>2.5Vp-p)
3.3 Video Performance
Maximum supported pixel clock 300MHz
Pulse Rise and Fall time 5.5nsec(typical.) 10 to 90% at 35Vp-p
*The rise and fall time of the input video signal is 2.0nsec or less.
*The pulse rise or fall time is determined using the formula
Where: Ta = Amplifier rise / fall time
Tm = Measured rise / fall time
Ts = Input signal rise / fall time
Tp = Probe effect on rise / fall time = 2.2 x Rl x Cp
Rl = Amplifier output resistance (ohm)
Cp = Total probe capacitance (F)
Tsc = Scope rise / fall time = 0.35 / Scope bandwidth (MHz)
Tm
2
- (Ts
2
+ Tp
2
+ Tsc
2
)
Ta =