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PDP-501MX
ADJUSTMENT
Adjustments of Parts
Note)
In these adjustments, assembly are indicated by the following
symbols.
:ANALOG VIDEO ASSEMBLY
A
:PROGRESSIVE BLOCK
B
:POWER SUPPLY MODULE
J
:Y DRIVE (A) ASSEMBLY
G
:Y DRIVE (B) ASSEMBLY
H
Procedure
Adjusting Item
1
TINT
B-Y demodulation
2
angle
3
Colour (B-Y)
4
Colour (R-Y)
Deflection PLL
5
adjustment
Acquisition PLL
6
adjustment
VCO free-run
7
frequency for 910
fH clock
Y/C mode chroma
8
signal output level
V
, V
H_A
H_B
9
voltage
adjustment
38
Input Signal
Adjusting Point
Chroma modulation
VR9002
ramp signal
(
A
VR9005
EIA colour bar
(
A
EIA colour bar (Colour
VR9003 (
saturation 75% only)
EIA colour bar (Colour
VR9004 (
saturation 75% only)
Any standard
L4715 (
signal
Any standard
signal
L4706 (
VR3350
NTSC RAMP signal
(with burst and chroma)
(
AP
NTSC RAMP signal
VR3351
(S terminal signal with
(
AP
burst and chroma)
VR3302 (
100% white signal
VR3301 (
Note: Position for pasting the drive voltage label
Drive voltage label ARW1077
Adjust so that the output of Pin 2 (R-Y signal) of CN9505 becomes
minimum.
)
Adjust so that the amplitudes of a and b become equal at the output
of Pin 4 of CN9505.
)
Adjust so that the output of Pin 4 (B-Y signal) of CN9505 becomes
)
A
0.525 Vp-p ±10 mV.
Adjust so that the output of Pin 2 of CN9505 becomes 0.525 Vp-p
)
A
±10 mV.
Adjust so that the voltage of TP K4701 becomes 2.6 ± 0.1V.
)
B
Adjust the timing of the waveforms of Pin 3 (CLP) of CN4703 and TP
K4702 (HRA) so that the rising edge of the HRA pulse are at the
center of the CLP pulse.
)
B
Set the input to "C.VIDEO", observe the voltage of Pin 7 of IC3352
(TP P3350), and adjust so that the voltage becomes 2.5V ± 0.1V using
)
the digital voltmeter.
Set the input to "S.VIDEO", observe the Q3354 emitter using the
oscilloscope, and adjust so that the level of the chroma signal becomes
)
400 mV ± 20 mV.
V
(Scan IC power supply voltage A)
H A
Check the drive voltage label value at the upper left side of the unit
inside, and adjust RV3302 so that the voltage between Pin 1 (VH_
A) and Pin 4 (GND H_A) of the check connector CN3303 becomes
)
that value.
G
V
(Scan IC power supply voltage B)
)
H B
H
Check the drive voltage label value at the upper left side of the unit
inside, and adjust VR3301 so that the voltage between Pin 1 (VH_B)
and Pin 4 (GND H_B) of the check connector CN3304 becomes
that value.
22
Adjusting Method
b
a
CLP
HRA
Center± 0.2µs

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