Teac MT-20D-IO Maintenance Manual page 157

4-3-15 Check and adjustment of read level
(1) Articles to be used
(a) Work tape
(b) Conventional screw driver small size
(c) SOA
Cd) DC power supply (+12 V, +5 V)
"Permalloy Head"
(2) Check and adjustment procedures
(a) Connect SOA in accordance with Item 4-2-5, and set the POWER
switch to the PSA side.
(b) Load the work tape on
MTU.
(c) Wind the work tape nearly in the winding center.
(d) Key in "CO". The read level is displayed to the display DATA 1 on
SOA.
(e) Check if the read level is within the range of 1.22 V to 1.72 V.
(center value: 1.47
V)
(f) Key in
ttF"
to stop the operation.
(g) Key in "A21". The write/read track on
MTU
is changed over to
Track 1. Perform the same check as in steps (d), (e) and (f).
(h) If the result of step (e) is out of the specification, make the
following adjustment.
(i) Key in "A20". The write/read track on MTU in changed over to
Track O.
(j) Key in "E3". The indicator REPEAT on SOA lights up.
(k)
Key in "CO". The read level is indicated to the display DATA 1 on
SOA. Adjust R48 on the PCBA Drive Control until the read level is
1.47 V.
(1) Key in "F" to stop the operation.
- 4064 -