Sony HDCU3300 HD, Руководство по обслуживанию

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3-6 (E)
HDCU3300/MM (J,E)
3-3. Video and Reference Signal System
Adjustment
3-3-1. 27 MHz VCO Free-run Adjustment
Measure : Frequency counter, Oscilloscope
Preparation
. To be extended : AT-167S board (front side)
.
Remove the cable connected to the REFERENCE IN
connector on the HDCU rear panel.
. S401 (REFERENCE)/AT-167S board panel side
→
SD
. Connect the measure as shown in the following figure.
.
After turning on the power, wait for 10 minutes at least
and start adjustment.
Adjustment Procedure
Measuring point : TP704 (F-4)/AT-167S board
Adjusting point :
1
RV701 (F-2)/AT-167S board
Specifications : 27,000,000
±
10 Hz
Setting after Adjustment
After finishing the adjustment, return the switches to the
original configuration. Reconnect the disconnected cables.
3-3-2. Clock (74 MHz) Duty Adjustment
Measure : Oscilloscope (20 MHz BWLimit: ON)
Adjustment Procedure
Measuring point : TP714 (H-1)/AT-167S board
Adjusting point :
1
RV702 (G-1)/AT-167S board
Specifications : C = 1.60
±
0.04 Vdc
A
B
A
=
B
C
GND
AB
C
D
E
F
G
H
J
1
2 3
4 5
S403
S404
S405
S410
S409 S408
S407
S406
S419
S418
S402
S401
S420
S416
S41
1
RV702
RV701
S103
S104
S101
S102
S413
S412
AT
REF IN UN LOCK
H PHASE REFERENCE
HD RMT SD AD
V
DELA
Y
1
1
TP601 TP601
TP705
TP703
TP704
TP702
TP709
TP713
TP712
TP71
1
TP701
TP714
AT-167S board (A side and panel side)
Probe
Oscilloscope
Frequency
counter
CH2
IN
CH2
OUT
IN