Teac MT-20D-IO Maintenance Manual page 165

"D/CAS" "SCSI"
4-3-21 Check and adjustment of VFO operating point
(1) Articles to be used
(a) Work tape
(b) Digital voltmeter
(c) Conventional type screwdriver Small size
(d) "D/CAS" SOB
(e) "SCSI" SOD
(f) DC power supply (+12 V, +5 V)
"D/CAS"
(2) Check and adjustment procedure
(a) Connect SOB in accordance with Item 4-2-6.
(b) Prior to the start of this item of check and adjustment, allow a
warmup time of 10 min or more.
Cc) Load the work tape on
MIU.
Cd) Connect the (+) terminal of the digital voltmeter (DCV) to TP4 on
the PCBA interface control. and its (-) terminal to
GND.
Ce) Key in "DOF". "D51".
"Bi",
and
"AA"·.
The tape is wound.
(f)
Check
i f
the voltage at TP4 is within the range of 2.25
V
to
2.75 V (center value: 2.50 V) during the forward winding.
(g) When the measured value in step (f) is out of the specification,
adjust R12 on the PCBA Interface Control until the voltage at TP4
is set to 2.5 V.
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