Operating instructions

Figure 6-18
MTR-90III Block Diagram
+ –
– +
+ –
+
–
+ –
Reproduce Head
– +
–
+
+
–
–
+
–
+
+
–
–
+
–
+
+
–
+
–
+
–
+
–
CUE ATT
EQ Amplifier Reproduce
–50dBu
Low Comp
–10dBu
Repro
Bias Trap
–10dBu
Output +4dBu
Active Bal. Output
( )
VU Drive
Record Reproduce Amplifier
Mode Control Circuit
from Tape Deck & Amplifier Remote
( )
Amplifier Control Command
EQ EQ
+ –
Sync
Input
Repro
Erase Control
Bias Control
Tape Speed Low
Tape Speed High
Rec Output
Record Head
–20dBu
Low Speed
Line Moni
High Speed
Tape Speed HI/LOW
TP1
10 Ohm
Erase Output
1.1mA Signal 17mA Bias
VCA
VCA
B
A
Phase Comp Phase Comp
Bias Level
Erase Level
–13dBu
Rec EQ Rec EQ
257 kHz 85.7 kHz
Line Input
+4dBu
Active Bal
Input Bias Sig
Erase Sig
Line/Test
Test Signal
EQ AES/NAB/IEC
Low Comp
ON/OFF
–50dBu
EQ Amplifier Sync Rep
Low Comp
–10dBu
Sync
–8dBu
+ –
MTR-90III Operation and Maintenance Manual
October 1990
Section 6 Alignment
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