Adjustment; Before Adjustment; Precaution; Required Test Equipments - JVC HR-S2901U Service Manual

3.1

Before adjustment

3.1.1 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 method 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.

3.1.2 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)

3.1.3 Required adjustment tools

Roller driver
Jig RCU
Back tension cassette gauge
Alignment tape(MHP)
Alignment tape(MHP-L)
Roller driver Jig RCU
PTU94023B
PTU94002
Alignment tape Alignment tape
(SP, stairstep, NTSC) (EP, stairstep, NTSC)
MHP MHP-L
SECTION 3

ADJUSTMENT

: Used : Not used
Mechanism
Electrical
compatibility
adjustment
adjustment
Back tension cassette gauge
PUJ48076-2
3.1.4 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
3.1.5

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 disassembly".)
Jig RCU
[Data transmitting method]
Depress the " " ( 3 ) button
after the data code is set.
CUSTOM CODE
43: A CODE
DATA CODE
Fig. 3-1-5a Jig RCU [PTU94023B]
• Set the switches as shown below unless otherwise speci-
fied 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 be-
low, 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
•
Color(colour) bar pattern [NTSC]
(75%)
White
Q I Black
100%
INITIAL MODE
OFF
NORMAL/NATURAL
OFF
ON
ON
OFF
3-1