10-1
HDW-750/750CE V1
Section 10
Electrical Alignment of VTR System
10-1. Preparation
Required Equipment
.
Audio analyzer
Sony Tektronix AA501A (OP.2) or equivalent
.
Generator
Sony Tektronix SG-5010 or equivalent
.
Oscilloscope
Sony Tektronix TDS460A or equivalent
.
Digital voltmeter
Advantest TR6845 or equivalent
.
Standard playback machine
Fixtures and Tools
.
Alignment tape (HR5-1A: 8-960-076-01)
.
Working tape
n
Prepare a working tape for electrical adjustment that has
been used as few times as possible. A recorded tape can
also be used, but a new signal will be recorded on it.
Initial Position of Switches
Inside panel :
AUDIO IN selector switch CH1, CH2
→
REAR
OUTPUT/DCC switch
→
CAM/ON
Rear panel :
AUDIO IN selector switch CH1, CH2
→
LINE
Setup menu (MAINTENANCE menu) :
.
07
*
VTR MODE-2
AU REF LEVEL
→
_
18 dB
AU REF OUT
→
0 dB
Alignment tape (HR5-1A)
The same CUE signal is recorded on the alignment tape
(HR5-1A) every 5 minutes.
If a recorded position specified by this document becomes
worn-out, use different recorded positions of the CUE signal.
Example : The CUE signal of 3 kHz at
_
20 VU is recorded
in the following positions in addition to the
position 00 : 02 : 30 : 00 to 00 : 02 : 55 : 00.
.
00 : 07 : 30 : 00 to 00 : 07 : 55 : 00
.
00 : 12 : 30 : 00 to 00 : 12 : 55 : 00
.
00 : 17 : 30 : 00 to 00 : 17 : 55 : 00
AUDIO LEVEL CH1, CH2 Control Knobs
Reference Position
Set the control knobs to the inverted
triangle (
) (2 o’clock position).
0
10
10-2. Audio System Alignment
10-2-1. CH1 Unity Level Adjustment (for VCA)
Preparation
.
Complete the setting as shown below by using the setup
menu.
MENU : MAINTENANCE
PAGE : 07
*
VTR MODE-2
ITEM : REAR1/WRR VR SEL
→
F
+
S1
ITEM : REAR2/WRR VR SEL
→
F
+
S2
.
MIC control knob/front panel
→
Fully clockwise
rotation
.
AUDIO LEVEL CH1 control knob/inside panel
→
Reference position
.
AUDIO SELECT switch CH1/inside panel
→
MANUAL
.
Connect sine wave of 1 kHz at
+
4 dBu to AUDIO IN
CH1 connector/rear panel.
Adjustment Procedure
1.
Equipment :
Audio analyzer
Measurement point : TP101 (D-3)/FP-121 board
(B side)
Adjustment point :
1
RV10 (E-4)/FP-121 board
(B side)
Specifications :
_
20
±
0.1 dBu
2.
Equipment :
Audio analyzer
Measurement point : TP3 (F-4)/FP-121 board (B side)
Confirm that the audio signal satisfies the specifica-
tions of
_
33
±
1.5 dBu.
G
F
E
D
C
1
2
3
4
5
6
B
A
E501
R
V10
TP201
TP102
R
V20
R
V22
RV11
R
V12
RV151
RV152
R
V13
R
V23
R
V150
R
V153
TP302
TP401
TP6 TP5
TP202
RV502
RV501
TP501
RV503
TP811
TP810
TP3
TP4
TP101
TP813
TP802
TP812
TP805
TP807
TP808
TP809
TP803
TP814
TP815
TP806
TP804
FP-121 board (B side)