Sony HDW-750 Maintenance Manual page 439

Check Procedure
1. Alignment tape playback
Play back the alignment tape HR2-1A (from 01 :
00 to 15 : 00).
2. CTL head position check
(1) Set the switch S402/MDC-13 board (side B)
to ON.
Then D404 turns on and operation of the
TRACKING control knob is enabled.
(2) Rotate the TRACKING control (RV401)/
MDC-13 board until the center of the RF
envelope waveform becomes maximum.
Check at this time that the marker is output at
the specified position with respect to SERVO
CF (TRIG) on the envelope waveform as
shown.
(3) Set the switch S402/MDC-13 board to OFF
and set the TRACKING control to the FIX
position.
Check at this time that the output level of the
envelope waveform remains unchanged as
same level as in step (2).
If the specification is not satisfied, perform
step 3 and the subsequent steps.
Adjustment Procedure
3. CTL head position adjustment
Adjust the CTL head position adjustment nut with
a nut driver until the marker position of the RF
envelope waveform satisfies the specification and
at the same time the output level of the center of
the RF envelope waveform becomes maximum.
4. CTL head position recheck
Recheck the CTL head position following the
steps 1 and 2.
When the adjustment is performed
5. CUE/TC head position adjustment
(Refer to Section 8-2-8.)
HDW-750/750CE V1
Alignment tape
HR2-1A
S402 D404 : Flashing
S403
RV401 MDC-13board
(side B)
CH1 REC A PB ENV
CH2 SERVO CF
Specification : Adjust the CTL head position until the following two
requirements are met. First, the marker in the
envelope waveform must be located in the specified
position with reference to the SERVO CF signal.
Second, amplitude of the center of the envelope
waveform must be maximum.
8-2. Tape Run System Adjustment
CTL head
Position adjustment nut
S402 D404 : Flashing
S403
TRACKING volume
control (RV401)
Marker
8-35