JVC RV-DP200BK Service Manual page 24

RV-DP200BK
Standard values for confirmation of electronic performance
Items Condition
Erasing Fast-forward and
current rewind direction:
(standard Recording mode
and AC-514 for TYPE II,
reference AC-225 for TYPE I
value) Measuring terminal:
Both erase head ter-
minals
Adjustment of Standard frequencies:
reproduction 1 kHz and 10 kHz
of frequency (REF: -20 dB)
characteristic Test tape: TYPE II:
s AC-514
Measuring input
terminal: OSC IN
1-24
Method for adjustment
and confirmation
Load the test tape (AC-514 for TYPE II,
AC-225 for TYPE I) into the tape
playback mechanism and preset it to the
record-pause mode.
After setting it to the recording mode,
send 1 M in series to the erase head and
measure the erasing current from both
erase head terminals.
Load the test tape (AC-514 for TYPE II,
AC-225 for TYPE I) into the tape
playback mechanism and preset it to the
record-pause mode.
Input the standard value of -20 dB and
the standard frequencies of 1 kHz and 10
kHz repeatedly to the microphone input
from the transmitter in the recording
mode. Adjust VR31 for Lch and VR32 for
Rch so that the difference in level
between 10kHz and 1 kHz is -1dB
Repeat the above for TYPE I and confirm
that the difference in level is -XdB
Standard Parts to be
value
TYPE II: 110
mA
TYPE I: 75 mA
Difference in Lch: VR31
output Rch: VR32
between 1 kHz
and 10 kHz: -1
dB 5 dB
5dB.
dB.
adjusted