Sony TC-RX370 - Adjustments and Calibration; Mechanical Adjustments Procedures; Electrical Adjustments Procedures

TC-K370/RX370 |
SECTION 3
ADJUSTMENTS
3-1. MECHANICAL ADJUSTMENTS
PRECAUTION
1. Clean the following parts with a denatured alcohol-
moistened swab:
record/playback/erase head (TC-RX370)
capstan 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 perfomed with the rated
power supply voltage unless otherwise noted.
Torque Measurement
Torque Torque meter Meter reading |
30 to 65g ° cm
Forward C Q-102C
(0. 42 to 0.9 oz * inch)
DECK A: 1 to 6g- cm
Forward CQ-102C (0.014 to 0.08 oz + inch)
back tension DECK B : 2 to 9g*cm
(0.03 to 0.12 02° inch)
Reverse Ie 30 to 65g ° cm
C Q-l02RC
| (TC-RX370) (0.42 to 0.9 oz inch)
Reverse 1 to 6g-cm |
back tension C Q-102RC (0.014 to 0.08 oz ° inch)
(TC-RX370)
Sane ieee ee aa it
70 to 120g ° cm
FF, REW CQ-201B
(0. 98 to 1.87 oz ° inch)
3-2. ELECTRICAL ADJUSTMENTS
PRECAUTION
1. The adjustment should be performed in the publication.
(Be sure to make playback adjustment at first.)
2. The adjustment and measurement should be performed
for both L-CH and R-CH.
e Switch position
DOLBY NR switch : OFF
DIR MODE switch :2
e 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
LINE IN LINE OUT
pinch roller
record/playback(TC-K370) erase head(TC-K370) rubber belts
Standard Input Level
Input terminal LINE IN
source impedance 10kQ
input signal level 0.25V (—10dB)
Standard Output Level
Output terminal LINE OUT
load impedance 47kQ
output signal level 0.44V (—5dB)
Test Tape
P-4-A100 10kHz, ~10dB Azimuth Adjustment
PB Level Adjustment
Tape Speed Adjustment
P-4-L300 315Hz, 0dB
WS-48B 3kHz, 0dB
0dB=0.775V
Record/Playback Head(TC-K370) Azimuth Adjustment
Record/Playback/Erase Head(TC-RX370)
Procedure:
1. Forward Playback Mode
test tape
P-4-A100
(10kHz, —10dB)
LINE OUT
2. Turn the adjustment screw for the maximum output
levels. If these levels do notmatch, turn the adjustment
screw until both of output levels match together within
1dB.
L-CH
peak
within 1dB
R-CH
peak
screw
position
screw
Eur R-CH ce angle