Alignment Instructions
Playback
1. Azimuth Adjustment
Connect a scope or VTVM to the right channel PRE-AMP OUTPUT
jack. Insert a test tape (TEAC MTT-114, 115) into the unit. Adjust the
Azimuth adjusting screw for maximum output into the right channel.
(See figure 1 R/P HEAD.)
2. Tape Speed Adjustment
Connect scope, VTVM and FREQUENCY COUNTER to the right
channel PRE-AMP OUTPUT jack. Insert a Test Tape (MTT-111 3
kHz) into the unit. Adjust the tape speed adjusting screw for a 3 kHz
value in the frequency counter. (See fig. 1 DC F.G. Servo Motor.)
3. Output Level Adjustment
Connect scope and VTVM to the TP-2 and Ground (L-ch and R-ch).
Insert a test tape MTT-150 (Dolby level calibration tape 200 nwb/m)
into the unit. Adjust the P 104 (left) and P 204 (right) for a 580 mV
reading.
4. DNL adjustment
Connect a scope to the PRE-AMP OUTPUT jack. Set the unit for a
PLAY function, then depress the PAUSE button, DNL switch, ON.
Adjust the VR 501 (L-ch), VR 601 (R-ch) so that the level of high
frequency noise is at a minimum on the scope. (See fig. 1, DNL
P.C.B.)
Recording
1. OSC Frequency Adjustment
Connect the scope and frequency counter to the terminals of the
erase head. Set the unit for recording. Adjust L 1 so that there is an
OSC frequency value of 105 kHz on the frequency counter. (See fig.
1 Power P.C.B.)
2. Bias Trap Adjustment
Connect the scope and VTVM to the TP-3 and Ground. (See fig. 2.)
Set the unit for recording. Adjust the L 104 (L-ch) and L 204 (R-ch) so
that the level on the VTVT is at a minimum. (See fig. 2.)
3. Bias Current Adjustment AF
Generator
333 Hz
1 kHz
0 dB - 1 V
Attenuator -
95 dB Unit
Mic. Input L
R
V.T.V.M.
Scope
Connection should be made as above. Set the unit for recording. For
Fe 203, adjust C 133 (L-ch), C 233 (R-ch) to flat level at between 333
Hz and 10 kHz. For Cr02, adjust C 134 (L-ch), C 234 (R-ch) to flat
level at between 333 Hz and 12,5 kHz. (See figure 2.)
4. Dolby NR Bias Trap Adjustment
Connect the VTVM and scope to the test point pin on the Dolby
P.C.B. (See figure 1).
Set the unit for recording. Dolby NR switch "ON" position. Adjust L
303 (L-ch), L 403 (R-ch) for the minimum indication on the VTVM.
5. Input Sensitivity Adjustment AF
Generator
333 Hz
0 dB - 1 V
Attenuator
-70 dB Unit
DIN Input
L
R
TP-2
V.T.V.M.
Scope
Connection should be made as above. Set the unit for recording.
Record level controls (P 103, P 203) set at maximum. Adjust P 102
(L-ch), P 202 (R-ch) for 580 mV reading at TP 2 (L-ch, R-ch). (See
figure 2.)
6. Level Meter Adjustment
Connection should be made as for ADJUSTMENT 5. When
ADJUSTMENT 5 has been completed (580 mV rading at TP a),
adjust P 107 (L-ch), P 207 (R-ch) for +3 VU reading on level meters
(L-ch, R-ch). (See figure 2.)
7. Record Current Adjustment
Connection should be made as in ADJUSTMENT 5. Feed -70 dB
(333 Hz) into the DIN input. Set the record level controls (103/203) to
maximum.
Make a recording (use blank tape) then playback what has been
recorded and adjust P 105 (L-ch), P 205 (R-ch) for Fe 203 Tape, P
106 (L-ch), P 206 (R-ch) for Cr02 Tape so that the output at TP 2 has
a value of 580 mV. (See figure 2.)
8. Peak Indicator Level Adjustment
Set the unit for recording. Feed -68.5 dB (1 kHz) into the DIN input
Left and Right channels.
Adjust P 2 until the peak level indicator lights up. (See fig. 2).
AF Generator
1 kHz
0 dB = 1 V
Attenuator
-68.5 dB (1 kHz)
DIN Input
L
R
Unit
9. ALC Balance Adjustment
Disconnect R 1 (or cut the foil pattern) so that the Bias OSC is
stopped. Set the ALC switch to the "ON" position and keep the unit
set at recording. Feed -50 dB (1 kHz) signal into the DIN input Left
and Right channels. Adjust P 1 so that the value of the level meter on
Left and Right channel will be the same. (See figure 2 ALC
BALANCE).
AF Generator
1 kHz
0 dB = 1 V
Attenuator -50 dB
(1 kHz) Unit
DIN Input
L
R
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