JVC HR-J588 - Electrical Adjustment; Precaution; Required Test Equipments; Required Adjustment Tools

3-1
SECTION 3
ELECTRICAL ADJUSTMENT
3.1 Precaution
The following adjustment procedures are not only necessary
after replacement of consumable mechanical parts or board
assemblies, but are also provided as references to be re-
ferred to when servicing the electrical circuitry.
In case of trouble with the electrical circuitry, always begin a
service by identifying the defective points by using the meas-
uring instruments as described in the following electrical ad-
justment procedures. After this, proceed to the repair, replace-
ment and/or adjustment. If the required measuring instruments
are not available in the field, do not change the adjustment
parts (variable resistor, etc.) carelessly.
3.1.1 Required test equipments
• Color (colour) television or monitor
• Oscilloscope: wide-band, dual-trace, triggered delayed
sweep
• Signal generator: RF / IF sweep / marker
• Frequency counter
• Signal generator: stairstep, color (colour) bar [PAL]
• Recording tape
• Digit-key remote controller(provided)
3.1.2 Required adjustment tools
3.1.3
Color (colour) bar signal, color (colour) bar pattern
Fig. 3-1-4a Jig RCU [PTU94023B]
3.1.4 Switch settings and standard precautions
The SW settings of the VCR and the standard precautions
for the electrical adjustments are as follows.
•
When using the Jig RCU, it is required to set the VCR
to the Jig RCU mode (the mode in which codes from
the Jig RCU can be received). (See SECTION 1 DIS-
ASSEMBLY.)
• Set the switches as shown below unless otherwise
specified on the relevant adjustment chart. The switches
that are not listed below can be set as desired.
If the VCR is not equipped with the functions detailed
below, setup is not required.
• If there is a reference to a signal input methed in the
signal column of the adjustment chart, “Ext. S-input”
means the Y/C separated video signal and “Ext. input”
means the composite video signal input.
• Unless otherwise specified, all measuring points and
adjustment parts are located on the Main board.
(75%)
White(75%)
0.7 V
0.3 V
Horizontal sync
VU
1V
White(100%)
Yellow Cyan
Green
Magenta
Red
Blue
Burst
0.3 V
V(R-Y)
U(B-Y)
White
Yellow
Cyan
Green
Magenta
Red
Blue
U Black
White
100%
V
•
Color(colour) bar signal [PAL]
•
Color(colour) bar pattern [PAL]
INITIAL MODE
DATA CODE
CUSTOM CODE
43: A CODE
53: B CODE
[Data transmitting method]
Depress the “ ” ( 3 ) button
after the data code is set.
Jig RCU
Jig RCU
PTU94023B
Alignment tape
(SP, stairstep, PAL)
MHPE
AUTO PICTURE/VIDEO CALIBRATION/ OFF
B.E.S.T./D.S.P.C.
PICTURE CONTROL/SMART PICTURE NORMAL/NATURAL
VIDEO STABILIZER OFF
TBC ON
Digital 3R ON
VIDEO NAVIGATION/TAPE MANAGER OFF