Sony DNW-A100 Maintenance Manual page 78
Digital video hybrid recorder
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Also See for DNW-A100:
- Maintenance manual (416 pages) ,
- Operation manual (134 pages) ,
- Brochure & specs (14 pages)
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3-7. Video System Alignmnet (VPR-17 Board)
3-7-6. Reference Color Frame Pulse Check (Standard System only)
Reference Color Frame Pulse Check
1. To enter the maintenancemode, press S1101 (G-1) on
the SS-63 board.
2. Enter A20 : VPR VR.
3. Connect and set the oscilloscope as follows:
ALT display mode
CH-2: TP502/VPR-17(F-3), DC 2 V/DIV
GND: E501/VPR-17(G-1)
TIME: 10 ms/DIV for DNW-A100/A50/A45
20 ms/DIV for DNW-A100P/A50P/A45P
TRIG: CH-1: DC 2 V/DIV
(Connected SG2's FRAME REF output)
4. Turn the signal generator SG2's SC PHASE control
knob clockwise (2) slowly until the waveform of the
oscilloscope's CH-2 (TP502) changes from a to b.
5. Measure the BURST phase (angle A) on the vector
when just inverted the phase of CH-2 (TP502) on the
oscilloscope.
6. To return the position of the BURST signal to be
displayed on the vector, turn SG2's SC PHASE
control knob counterclockwise (3).
7. Turn the signal generator SG2's SC PHASE control
knob counterclockwise (3) slowly until the waveform
of the oscilloscope's CH-2 (TP502) changes from a
to b.
8. Measure the BURST phase (angle B) on the vector
when just inverted the phase of CH-2 (TP502) on the
oscilloscope.
9. To return the position of the BURST signal to be
displayed on the vector, turn SG2's SC PHASE
control knob clockwise (2).
10. Confirm that the difference between the angles A and
B is within specification.
If the specification is not satisfied, perform steps (1)
through (4).
Specification: A _ B = 0 ± 10d
11. To exit the A20 : VPR VR, press the MENU button
once.
Perform following steps (1) and (2) when the specification
in step 10 was not satisfied.
(1) Add/subtract 1 to/from the data value of "REF 1ST
FLD DET".
n
The data increase/decrease is dependent on the angles
A and B measured in steps 5 and 8.
A > B : Subtract 1 from the data value.
A < B : Add 1 to the data value.
(2)
Return to step 4.
3-42
Vector
A
Turn SC PHASE control knob (SG2)
clockwise slowly until the signal
phase of CH-2 (TP502) on oscillo-
scope is inverted. (a b)
Turn SC PHASE control knob (SG2)
counterclockwise slowly until the
signal phase of CH-2 (TP502) on
oscilloscope is inverted. (a b)
B
DNW-A100/A50/A45
Oscilloscope
CH-1
(FRAME REF)
a
CH-2
(TP502)
b
A
B
C
D
E
F
G
E501
TP501
TP502
E500
TP700
TP701
TP500
VPR-17 Board (Side A)
A
B
DNW-A100P/A50P/A45P
H
J
K
L
M
A N
E100
E101
DNW-A100/A50/A45
DNW-A100P/A50P/A45P
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