JVC RC-660 L User Manual

RC-660L/LB/LD/LE/LS
[I] Electrical Circuit Adjustments
Electrical Adjustment of Location
BEAT CUT
(Amplifier) F2s3
CN10
SLIT PATTERN LE
ee
SLIT to Rle
PATTERN C4 O BIAS FREQ
L301
TP Te2 VR30! © onet
(GND) OS
He) ats
CURRENT
$102
Fig. 8
Model RC-660 L/LB/LD/LE/LS | Cassette section
Source voltage DC: 9V, Load O dBs mW (0.775 V)/3.2 2
AC: 240/220/110 V
Step Item Adjustment method
1 Measurement Confirmation Standard blank tape for measurement will be the following:
Method Norma! tape LNC-60.
2 Speed, Wow & Flutter When the wow & flutter is measured by the test tape VTT-656 (3,000 Hz) or another tape of
the same kind, the value of the wow & flutter should be within ___%. The speed value should
be within +15% to —15% 3020 Hz. Measurement is RMS.
——EEe
3 Recording/Playback Frequency] Signal of — 20 dB against the standard input and the value when 1,000 Hz and the frequen-
Characteristics cies listed below are recorded and played back.
Normal tape 1000 H2/125 Hz: O dB +4 dB
1000 Hz/6.3 kHz: +1dB+ dB
4 Recording/Playback Distortion | Record and playback the fixed input signals of 1,000 Hz and measure the distortion rate. The
Rate Measurement value should be as follows:
Normal tape within 8%.
5 Playback Output Using the test tape VTT-663 (1,000 Hz) or another tape of the same kind, the playback out-
Measurement put value should be as follows:
(9 V impressed to CN-104) 10% > 2100 mW (2.59 V/3.2 Q)
(7 V measured to CN-102) Max. output> 2500 mW (2.83 V/3.2 Q)
6 Playback Frequency Using the test tape VTT-673N or another tape of the same kind, each value is as follows when
Characteristics 1,000 Hz is changed to O dB:
1000 Hz/125 Hz: O dB+3 cB
1000 Hz/ 8 Hz: 0 dB+3 dB
4
7 Playback Level Confirmation Playback the test tape and confirm that the level difference between the C-R is within 3 dB
when an output of 0 dBs/3.2 2 is obtained with CN-102.
lf it does not fit within the standards, cut out the lightning pattern and fit it into the pattern.
Pattern L (A) Slit Pattern L Short — L channel approximately 2 dB up.
Pattern R (B) Slit Pattern R Short — R channel approximately 2 dB up.
8 Wide Circuit Operation When you playback the signals of the left and right channels, the signals should be played
Confirmation back from the opposite channel from in the WIDE position.
(Example: When the right channel signal is received with a stereo modulation with an output of
60 dB and 30% modulation of FM 1 kHz:
BEAT CUT 1-2 [ BEAT CUT3/WIDE
Rch 0 dB | +5 dB
Lch | —2 dB |
cz
Note : If some do not fit in within the standards during recording/playback, frequency characteristics and recording/playback distor-
tion rate measurement, fit in adjusting the UR-BO.
Bias electric current increase — high range rises during recording/playback
Distortion rate worsens.
Bias electric current decreases — high range lowers during recording/playback
Distortion rate improves
(No. 1533) 7

JVC RC-660 L Specifications

General

Brand	JVC
Model	RC-660 L
Category	Cassette Player
Language	English