Teac MT-20D-IO Maintenance Manual page 150

(t)
Adjust R43 on the PCBA Drive Control until both the encoder
frequencies are within 2.86 kHz to 2.88 kHz (tne center frequency:
2.865 kHz).
(u) Key in
"F"
to stop the operation.
Remark The tape speed should be adjusted in the order of 90 ips
(R44) and 30 ips (R43) without fail.
If
R44 is adjusted
later than R43 the tape speed of 30 ips is also changed.
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