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SECTION 3
ADJUSTMENTS
3-1. MECHANICAL ADJUSTMENTS
PRECAUTION
1. Clean the following parts with a denatured alcohol-moistened
swab:
record/playback/erase head
rubber belts
idlers
2. Demagnetize the record/playback head with a head demagnetizer.
(Head demagnetizer do not approach for the erase head.)
3. Do not use a magnetized screwdriver for the adjustment.
4. After the adjustments, apply suitable locking compound to the
parts adjusted.
5.The
adjustments
should
be performed
with the rated power
supply voltage unless otherwise noted.
pinch roller
capstan
Torque Measurement
(0.42 to 0.9 oz * inch)
DECK
A : 1 to 6g * cm
Forward
(0.014 to 0.083 oz * inch)
back
CQ-102C
tension
DECK B : 2 to 9g * cm
(0.03 to 0.12 oz * inch)
30 to 65g
*cm
Cee
(0.42 to 0.9 02+ inch)
Reverse
iobue eh
see
CO ERC
(0.014 to 0.083 oz « inch)
70 to 120g¢cm
PRIREW
| CQ-201B
(0.98 to 1.66 ozsinch)
3-2. ELECTRICAL ADJUSTMENTS
PRECAUTION
1. The adjustment should be performed in the publication.
(Be sure to male playback adjustment at first.)
2. The adjustments and measurement should be performed for both
L-CH and R-CH.
® Switch position
DOLBY NR switch
: OFF
DIR MODE switch
aoa
@ Standard record position :
Deliver the standard input signal level to input jack and set the
REC LEVEL control to obtain the standard output signal level
as follows.
— Record Mode —
AF OSC
VTVM
attenuator
LINE OUT
LINE IN
Standard Input Level
source impedance
ae
ere
Standard Output Level
load impedance
47k Q
output signal level
0.5V ( — 3.8dB)
Test Tape
P-4-A 100
10kHz,
— 10dB
Azimuth Adjustment
P-4-L300
315Hz,
0dB
PB Level Adjustment
WS-48B
3kHz,
0dB
Tape Speed Adjustment
OdB=0.775V
Test Mode
1. Insert a short-circuit plug into TP801 (2P) and turn ON the
power switch. (Earth pin (9 of IC801 and turn ON the power
switch.)
At first, all the fluorescent tubes light up, then the system returns
to normal
display.
(However, "O000"is
not displayed on the
counter.)
2. To release the test mode, remove the short plug and turn off the
power switch.
3. Remove the short plug after completion of adjustment.
Record/Playback Head Azimuth Adjustment
Procedure :
.
1. Forward playback Mode
test tape
P-4-A100
(10kHz, — 10dB)
VTVM
LINE OUT
2. Turn the adjustment screw for the maximum
output levels. If
these levels do not match, turn the adjustment screw until both of
output levels match together within 1dB.
within *
Screw
position
L-CH
R-CH
peak
peak
—fe-
Screw position
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