Sony SRW-5000 Maintenance Manual page 350

(8) Turn the height adjustment nut of TG-3
clockwise so that the tape is in contact with
the upper flange and the RF envelope wave-
form becomes flat. (Fig. 2)
Simultaneously, ensure that the tape does not
in contact with the lower flange of TG-4.
(If contact, perform step (5).)
If the waveform does not become flat, perform
the steps 1 to 3 (check and adjustment) below:
1 Clean the drum lead with a wooden stick.
(Refer to Section 4-2-4.)
2 Press down the tape by wooden stick very
lightly and check to see that the tape is
running without aparting from the drum lead.
3 If the waveform does not become flat even
after performing steps 1 and 2, adjust the
height of TG-3 so that the RF envelope
waveform is nearly flat within the range of
the specification 15 shown in the Fig.3. At
this time, do not overpress the tape at TG-3.
n
After adjusting the height of TG-3 in step 3
above, be sure to check the height of AT head
(Refer to Section 6-7).
If the AT head height does not satisfy the specifi-
cation, restart the video tracking adjustment.
6-20
. Connection of the oscilloscope
CH-1 : TP52/EQ-94 board (CNF CG ENV signal)
CH-2 : TP5/EQ-94 board (SWP5 signal)
TRIG : CH-2
<EQ-94 board, side A>
A B C D E F G
1
TP52
2
Upper flange of TG-3
Contact
Tape
<Fig.2> CH-1 : TP52/EQ-94 board
Be flat
Marker
<Fig.3> CH-1 : TP52/EQ-94 board
A = RF max x 0.8
C x 100 > 70 %
Spec.15 :
A
H J K L M N P
TP5
Tape
No contact
Lower flange of TG-4
If the pressure
against the tape
at TG-3 is too much,
the waveform becomes
as shown in the right
figure. (NG)
If the pressure
against the tape
at TG-3 is too little,
the waveform becomes
as shown in the right
figure. (NG)
RF max
A
C
SRW-5000/5500