Sony GY-8240UWD Maintenance Manual page 198

4-4. Tracking Adjustment
If the waveform is not flat, perform the check and
adjustment below.
1 Clean the drum lead with a bamboo skewer.
(Refer to Section 2-2-3.)
2 Press down the tape by bamboo skewer very
lightly and check that the tape is running
without aparting from the drum lead.
3 Adjust the height of TG-3 so that the RF
waveform is nearly flat within the range of
the specification shown in the Fig.3.
At this time, do not overpress the tape at TG-
3.
(7) Adjust the height of TG-4 so that the lower
flange of TG-4 comes in contact with the
tape.
(8) Check the tape running at the drum exit side
in the following modes.
. FWD mode
. VAR _1 time nornal speed mode
. VAR _5 times nornal speed mode
. F FWD mode
. REW mode
If the tape curl does not satisfy the specification
at TG-3, perform the following adjustments while
observing the waveform.
1 Change the zenith of the CTL/TC head within
the range shown in Fig. 1.
2 Perform the tracking adjustment again. (Refer
to steps (1) through (9) mentioned above.)
(9) Press the switch S110 (ESC) on the DSP-90
board twice to exit the tracking adjustment
mode.
11. Recheck the Tracking
Refer to step 5.
12. Install the CL Guide Rail
Install the CL guide rail with two screws.
(Refer to Step 24 in Section 3-20.)
4-18
<Fig.3>
A B
A = RF max x 0.8
A = RF max x 0.8
<Tape running check>
5
Spec.2: Lead of drum exit side
The tape runs without any curl at the lead.
6
TG-3 (Exit guide)
The tape runs in contact with the upper flange.
The tape curl is less than 1/10 of the tape width.
7
TG-4
The tape runs in contact with the lower flange.
The tape curl is less than 1/10 of the tape width.
8
TG-5 (Threading roller)
The tape runs without any curl at the upper and lower
fianges.
Tracking Adjustment at Drum Exit Side
RF max
B x 100 > 80 %
A
C D
C x 100 > 80 %
A
RF max
GY-8240UWD
GY-8240FC