Adjustment; Precaution; Required Test Equipments; Required Adjustment Tools - JVC HR-J691U Service Manual

3.1

Precaution

• The adjustments of this unit include the mechanism
compatibility and electrical adjustments. During the
performance of this work, be sure to observe the pre-
cautions for each type of adjustment.
• 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.

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
• Signal generator: stairstep, color (colour) bar [NTSC]
• Recording tape
• Digit-key remote controller(provided)

3.1.2 Required adjustment tools

Roller driver
Back tension cassette gauge
Alignment tape(MHP)
Alignment tape(MHP-L)
Roller driver Back tension cassette gauge
PUJ48076-2
PTU94002
Alignment tape
(EP, stairstep, NTSC)
MHP-L
3.1.3 Color (colour) bar signal, color (colour) bar pattern
•
Color(colour) bar signal [NTSC]
White(100%)
White(75%)
Burst
100 IRE
1V
40 IRE
40 IRE
Q I
Horizontal sync
SECTION 3

ADJUSTMENT

: Used : Not used
Machanism
Electrical
compatibility
adjustment
adjustment
Alignment tape
(SP, stairstep, NTSC)
MHP
•
Color(colour) bar pattern [NTSC]
(75%)
White
Q I Black
100%

3.1.4 Switch settings

When adjusting this unit, set the VCR mode and switches
as described below.
• 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.)
Jig RCU
[Data transmitting method]
Depress the " " ( 3 ) button
after the data code is set.
CUSTOM CODE
43: A CODE
DATA CODE
Fig. 3-1-4a Jig RCU [PTU94023B]
• 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.
AUTO PICTURE/VIDEO CALIBRATION/
B.E.S.T./D.S.P.C.
PICTURE CONTROL/SMART PICTURE
VIDEO STABILIZER
TBC
Digital 3R
VIDEO NAVIGATION/TAPE MANAGER OFF
BLUE BACK

3.1.5 Manual tracking mode (Auto tracking ON/OFF) setting

(1) In order to set to the manual tracking mode during tape
playback, press the STANDARD/3X SPEED button on the
remote control unit.
• Each press of the button switches the auto tracking ON
or OFF.
• When the auto tracking is OFF, the monitor screen dis-
plays "AT: OFF".
• When the manual tracking mode is set, the tracking is
placed at the center position.
(2) Press CHANNEL +/- to adjust the tracking manually.
INITIAL MODE
OFF
NORMAL/NATURAL
OFF
ON
ON
OFF
3-1