Adjusting The Mechanism Using Alignment Tape; Height Adjustment Of Guide Rollers - Sony SLV-360 Service Manual

2-3. ADJUSTING THE MECHANISM USING
ALIGNMENT TAPE (KRV-52NE for NTSC)
HEIGHT ADJUSTMENT OF GUIDE ROLLERS
NO. 3 AND NO. 6
Playback
Alignment tape KRV-52NE (For NTSC)
Oscilloscope
TIM/DIV: 2ms
Trigger source: CH2
Trigger slope: +
CH-1: Connector PB RF pin for RF PC
board check
CH-2: Connector RF SWP pin for RF PC
board check
Height adjustment screw for No.3 tape
guide roller
Height adjustment screw for No.6 tape
guide roller
[Adjustment Method]
The following adjustment shall be carried out after completed
Section 2-1-1 "X-value adjustment and check".
1) Deactivate the automatic tracking control, and set the
tracking control at the center position. To set the tracking
control at the center position for the VCRs equipped with the
and [¥] tracking control keys, press both the and
tracking control keys at the same time. For the VCRs not
equipped with the tracking control keys, deactivate the
control by pressing the tracking
2-3-1.
Measuring
instrument
Measuring point
Adjustment
locations
automatic tracking
[AUTO/MANUAL| key on the remote control unit during
threading operation (after a tape is inserted but before the
VCR starts playing back the tape).
Turn the height adjustment screws of tape guide
rollers No.3 and No.6 little by little so that the RF
output envelope becomes as flat as possible.
a
Tape guide No.4
Height adjustment screw of
tape guide roller No.3
Tape guide No.5
2) Check if the RF output changes in amplitude by pressing the
tracking contro! key. The RF output should change period-
ically (changes from a minimum amplitude to a maximum
amplitude, and to the minimum amplitude again).
RF output
EET RTI Ss OR Fon
PB RF
RF SWP
Crosstalk
3) Tum the height adjustment screws of tape guide rollers No.3
and No.6 so that the RF output envelope becomes as flat as
possible.
4) Press the [Al tracking control key, and check that both the
beginning and end of the RF output change together the
same in amplitude.
5) Press the tracking control key, and check that both the
beginning and end of the RF output change together the
same in amplitude.
Press the [¥] tracking control key, then the [¥] tracking
control key, and check that both the beginning and end of
the RF output change together the same in amplitude.
When the [Aj tracking contro!
key is pressed.
At the tracking center position.
When the [¥j tracking control
key is pressed.
Height adjustment screw of
tape guide roller No. 6