Audio System Alignment - Sony HDW-750 Maintenance Manual

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
Rear panel :
AUDIO IN selector switch CH1, CH2 → LINE
Setup menu (MAINTENANCE menu) :
. 07*VTR MODE-2
AU REF LEVEL
AU REF OUT
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).
HDW-750/750CE V1
Section 10
Electrical Alignment of VTR System
→ CAM/ON
→ _18 dB
→ 0 dB
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 : 1RV10 (E-4)/FP-121 board
(B side)
_20 ±0.1 dBu
Specifications :
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
TP813
TP806
TP812
TP804
TP803
RV152
TP101
RV151
TP4
TP3 TP401
RV11
TP6 TP5
E501
C
1
A
TP810
B
2
TP811
RV502
TP201
RV501
3
TP102
TP202
4
RV503
TP302
5
TP501
6
FP-121 board (B side)
10-1