l
RS.TR9~
.
MEASUREMENTS
AND ADJUSTMENTS
Measurement
Condition
.
Rec. level
control;
Maximum
.
Timer switch;
Off
.
Recording-balance
control;
Center
.
Bias-adjustment
control; Center
.
Reverse-mode selector switch;
+z
.
Tape-to-tape recording-speed
switch;
Off
.
Dolby NR switch;
Off
.
ATC switch;
Off
.
Make sure heads are clean
.
Make sure capstan and pressure roller are clean
.
Judgeable room temperature
20:tSC
(68:t9°F)
Measuring instrument
.
EVM (Electronic Voltmeter)
.
Oscilloscope
.
Digital frequency counter
.
AF oscillator
.
ATT (Attenuator)
.
DC voltmeter
.
Resistor (6000)
Test
tape
.
Head azimuth adjustment (8kHz,
-20dB);
QZZCFM
.Tape speed
adjustment (3kHz,
-10dB); QZZCWAT
.
Playback frequency response (315Hz, 12.5kHz, 10kHz,
8kHz, 4kHz, 1kHz, 250Hz, 125Hz,63Hz, -20dB);
QZZCFM
.
Playback gain adjustment
(315Hz, Ode); QZZCFM
.
Overall gain
adjustment
and Overall frequency response
Normal reference blank tape; QZZCRA
CrO2 reference blank tape; QZZCRX
Metal reference blank tape; QZZCRZ
. Adjustment Points
TAPE SPEED ADJ.
DECK2: VR2(x1),VR1 (x2)
DECK1: VR3(x1)
ERASE CURRENT
ADJ. TEST POINT
(DECK1)
B
TP301
ERASE CURRENT
ADJ. TEST POINT
(DECK2)
VR3
811>7,
=
VR2 VR1
Notes:
.
The test mode terminals
on mechanism
control
P.C.B.
should
be shorted
with
a short
clip
as shown
right
figure.
.
After the adjustment
items disconnect
the short clip.
-14-
