Adjustment - JVC SR-VS30U Service Manual

4.1 Measuring instruments required for adjustment
(1) Low - frequency oscillator (oscillation frequency 50 Hz - 20
kHz, 0 dB output with 600 Ω impedance)
(2) Attenuator (600 Ω impedance)
(3) Electronic voltmeter and oscilloscope
(4) Standard tapes
VT712 (tape speed, wow and flutter measurement)
VT727 (400 Hz reference level)
VT742 (63 Hz, 1 kHz, 12.5 kHz) (play back frequency)
VT705 (12.5 kHz) (azimuth)
(5) Recording reference tapes
AC-225 (Normal), AC-514 (TDK SA) (CrO2)
AC-713 (TDK MA) (Metal)
(6) 600 Ω resistors (for attenuator matching)
(7) Distortion meter (band pass filter)
(8) Torque gauge (cassette) for CTG-N, TW2111, TW2121,
TW2231 and TW2241, mechanism adjustments
(9) Wow & flutter meter
(10) Frequency counter meter
(11) M300 gauge
(12) Band pass filter
4.3 Location of adjustment
Connection of CN845
470k
CN845
1
(L)
5
(R)
SECTION 4

ADJUSTMENT

+
F. COUNTER
(BIAS
FREQUENCY
GND
adj.)
+
DC VOLTMETER
V
(HX PRO adj.)
-
+
DECK B
REC LEVEL
V
adj.
-
DECK A
PB FREQ.
VR211
RESPONSE adj.
R
DECK A
PB LEVEL
adj. VR212
4.2 Measurement conditions
(1) Power supply voltage (your local voltage)
AC230 V 50 Hz
AC120 V 60 Hz
AC230/127/110 V 50/60 Hz
(2) Standard position of the switch and volume knob Switches
and volume knobs setting position
INPUT LEVEL
DOLBY NR
REVERSE MODE
(3) Standard level (0 dBs) is 0.775 V unless otherwise speci-
fied.
(4) The reference value of recording input level is LINE IN level
of a signal whose LINE OUT level is -8 dBs and H.PHONE
OUT level is -24 dBs.
VR246 VR146
R L
L1401
L2401
L
VR216 R
L
VR226
R
VR111
L
L8401
VR112
R L
B7101
BIAS
DECK A
FREQUENCY
H.SPEED
DECK A
TP
: B/E/EN version
: J/C version
: UT/U version
: MAXIMUM
: OFF
:
DECK B
REC FREQ.
RESPONSE
adj.
HX PRO adj
DECK B
FREQ.
VR216 VR116
RESPONSE
adj.
R L
DECK B
PB LEVEL
VR217 VR117
adj.
R L
NORMAL SPEED adj.
VR701 VR703
DECK B
DECK B
VR702 VR704
HIGH SPEED adj.
(No.MB061)1-13