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Aligment Procedures
1. Before Measurements and Adjustment
The following general conditions apply to the electrical measurements
and adjustments unless especially stated
otherwise.
—
Dolby NR switch off.
— Volume control: Recording level VR901 max.
— Use 500mvV (200nwb/m) for 0 dB as the standard level of the unit.
— Test tape
© TCC-154_
Azimutth(12.5kHz,
—20dB)
© TCC-122
Tape speed(3kHz,
—10dB)
© TCC-130
Playback level (Doiby NR ref. tape 400Hz, 0d8)
¢ TCC-184_—S—s«éPiayback frequency response
—
Reference Tape
® Normal
TDK AD-60
*CrOz2
__ Ss TDK SA-60
© Metal
TDK MA-X60
2. Instrument required
— Audio frequency oscillator
— ACVM or dual channel, mV-meter
— Wow/ Flutter meter
— Oscilloscope
Playback section
Adjustment
Test tape
Mode
a 'e Measure on|
Read on
Adjust with
Adjust to
Head
TCC-154
Play
Azimuth
12.5kHz
(A & B Deck)
Line out
ACmV-meter | Head adjusting
Max.
"4a
(A,BEX)
Oscilloscope | screw
* Lissajous'
figure become
|
a straight line
with an angle
45 degrees
Playback
| TCC-112
Play
Wow and
B Deck VR701
| Speed
1 3kHz
( (A & B Deck)
Flutter Meter
3000Hz + 30Hz
| at normal
| -10dB (A.BEX) |
|
Playback
TCC-130
|
A Deck VRIOIL/R | 500mV
Level
| 400Hz 0dB
ACmV-meter
|
' (A. BEX)
B Deck VR201L/R
i Playback
| TCC-1848
i
ACmv-meter
See graph Fig. 2
; frequency
| 12.5kHz, 1kHz,
freq. response
i responce
| 60Hz (A.BEX)
|
Recording section
[
T
i
: Adjustments
Test tape
Mode
ae
Measure on
Read on
Adjust with
Adjust to
H
i
4
.
1
+
4
BiasOSC
=| MA-X60
| Rec/Pause
|
White color | Frequency
£501
| 105kHz
+ 400Hz
| Frequency
| (TDK)
|
i
lead wire
Counter
|
:
|
of CNT501
|
|
: 1O5kHz trap
© MA-X60
|
; TP403L/R
| ACmV-meter ; L502L/R
| Minimize the
' suppression
| (TDK)
Oscilloscope
reading on ACVM
Target value | Metal
|
TP201L/R
VR5O3L/R | 9mV
| Bias
| MA-X60_
|
:
|
| Cro2
VR502
5.5mV
|
{
Normal
|
|
VR501
| 3.4mv
|
7
;
oe
Adjustment | Test tape;
Mode
gu.
Measure on
Read on
Adjust with
Adjust to
4
Recording
1 AD-60
400Hz to}
Line out
LF Generator | 50mV
Level
(TDK)
Line in
ACmv-meter |
|.
_______-}
TP402L/R
VR401L/R
About 15mV
Bias
MA-X60
400H2 to] Line out
See Target
*C
SA-60
Line in
Value Bias | 1¢ it necessary
|
AD-60
repeat bias
{TDK}
;
4kH2-6.3kHz
Recording number of Frequ- | adjustment
:
10kHz-12kHz
ency with the same input
|
14kHz-16kHz
voltage and play them back.
H
to Line in
Level
Arbitrary ;
400Hz to} Dolby level | ACmV-meter | VR901
Meter
Tape
Line in | Point
Oscilloscope
19kHz
suppression
i
Line out
ACmv-meter | LF Generator | 500mV
| Rec/Pause | 19kHz to
ACmvV-meter | L301L/R
Minimize the
| With Dolby | Line in
Oscilloscope
reading on ACVM
' NRon
Note:
*a. Prior to any measurement or adjustment with the tape running, heads and tape guides should be degaussed
and cleand. Reference below the figure.
*b. The maximum permissibie speed variation
+ 0.5%. Moreover the Wow and Flutter can be read. This vaiue
should not be exceed 0.2%.
*c. When the channel is adjusted, this may slightly affect the adjustment of the other channel.If the adjustment is
correct, the frequency response curve will be similar to curve 6 in figure 1, distortion below 3%.
Frequency — f
Playback
12.5k
250Hz
10k,
Recording
12,5k
250Hz
Fig. 1 Allowable Playback/Recording
Frequency Response Zone
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