NTSC TV SIGNAL PROCESSOR
M6120
6
FP
MITSUBISHI ICs (TV)
MITSUBISHI
ELECTRIC
Measure the output frequency at pin 7 when no signal is
input.
fH1 : Horizontal free-running frequency 1
fH2 : Horizontal free-running frequency 2
fH3 : Horizontal free-running frequency 3
SVC : Service mode function
Measure the output DC voltage at pin 17 when the service
switch is on.
Reduce the width of signal SG.I and measure the width of
input signal when the output waveform at pin 17 loses lock
with SG.I.
WVSS : Minimum sync detection width
VBLKW : Vertical BLK width
Output waveform at
pins 14, 15 and 16
GND
M
FPHU : Horizontal pull-in range (upper)
FPHL : Horizontal pull-in range (lower)
1. Input SG.H to pin 34.
2. Change the frequency of SG.H, and measure the
frequency at the moment when the output signal at pin 7 and
the input signal at pin 34 are pulled in. The horizontal pull-in
range is measured by comparing with the horizontal
frequency
of video signal.
HPT1 : Horizontal pulse timing 1
HPT1, HPT2, HPT3
pin 34 : H-sync
pin 15 : H OUT
VH : Horizontal pulse amplitude
HPTW : Horizontal pulse width
pin 15 : H OUT
HPTW
VH
HSTO : Horizontal stop operation
Confirm that the horizontal output is high when the horizontal
stop switch is on.
1. Measure AFCon which is the output amplitude of pin 19
when AFC switch is on and AFCoff which is that when the
switch is off.
2. AFCG is defined as follows:
AFCon (V
p-p
)
AFCoff (V
p-p
)
AFCG : AFC gain operation
AFCG = 20 log
(dB)
fV : Vertical free run frequency
Measure the output frequency at pin 17 when no signal is
input.
DEFLECTION BLOCK
HPT2 : Horizontal pulse timing 2
HPT3 : Horizontal pulse timing 3
1. Measure the timing of horizontal pulse as same method in
HPT1.
2. HPT2 and HPT3 are defined as follows:
HPT2, HPT3 = (Measured value) - HPT1
1. Input SG.A to pin 34.
2. Set H-free control data to 'ON', and measure the output
frequency at pin 7.
Hfree : Forced horizontal free-running frequency
1. Input SG.A to pin 34.
2. Set V-free control data to 'ON', and measure the output
frequency at pin 17.
Vfree : Forced vertical free-running frequency
FPVU : Vertical pull-in frequency (upper)
FPVL : Vertical pull-in frequency (lower)
Change the vertical frequency of SG.H and measure the
frequency when output waveform at pin 17 is pulled in.
VW : Vertical pulse width
pin 17 : V. PULSE
GND
M
VRsi : Vertical ramp size
VRsc1: Vertical ramp size control range 1
VRsc2 : Vertical ramp size control range 2
pin 17 : V-ramp
M
VRpo1 : Vertical ramp position control range 1
VRpo1
pin 34 : V-sync
pin 17 : V-ramp
VRpo2 : Vertical ramp position control range 2
1. Measure the timing of vertical ramp as same method in
VRpo1
2. VRpo2 is defined as follows:
VRpo2 = (Measured value) - VRpo1
37