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NOTES:
1.
3 ELECTRICAL ADJUSTMENTS AND CHECKS
Clean and demagnetize the entire tape path prior to
making any adjustments or checks.
in your area.
Make sure that the deck is properly set for the voltage
3-1
POWER
SUPPLY
CHECK
1. Connect a DC voltmeter to pin 15 of U101 on the Record/Play
back PCB.
2. The DC voltage should be +12 V. (See Fig. 3-1)
Adjustments and checks are generally done in order of
L-ch, then R-ch. Double reference numbers indicate L-
ch/R-ch.
(Example: R121/R221)
The value of "dB" refers to 0 dB (0.775 V). If an AC
voltmeter calibrated to 0 dB (1 V) is used, compensa-
tion should be made accordingly.
ohms or more must be used.
. An AC voltmeter with an input impedance of 1 M
Record/playbac! k PCB
DC VOLTMETER
3-2
MONITOR PERFORMANCE
(1)
MODE/
SIGNAL
ADJUST
REMARKS
+
SENNEGTION
INSTRUCTION
SOURCE
(or CHECK)
OUTPUT
MONITOR sw.:
SOURCE
400 Hz/—22 dB | R121/R221
+1 dB (869 mV)|
LINE min.
input level
Fae Fase
jeu cont.:MAX| (61.5mV)
|
meee
isMONITOR| 71
S A S S
Sn
a
se
a
ee a
eee
pace 2
Ms ane en
eo:
OUTPUT cont.
level
If channels do
IMPORTANT:
After
not match re-
setting, Jo not change
adjust R121 or
the OUTPUT contro},
1-2
%
dd
R220 to corres- | —5 9B (436 mV)
always haave if in this
pond to the
position,
higher OUTPUT.
MONITOR sw.:
2. VU meter | 2-4|Fig. 3-2
SOURCE
Ter eg on | Rlaginzi7
(1 OV
een NG
LINE cont.: MAx
| (61-5 mV)
Meter
nee I
asl
OSCILLATOR pisTORTION ANALYZER
OSCILLOSCOPE
acinar)
@
oe
ATTENUATOR
LINE
iN
R
F
IkHz
FILTER
$2
Fig. 3-2
Basic connection
AC Voltmeter
T1772
OSCILLATOR
OSCILLOSCOPE
Fig. 3-3
Connection
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