JVC UX-H10 Service Manual page 13

4.1.5 Cassette Amplifier Section
Item Measuring Condition
Head azimuth
Test tape:
adjustment 8 kHz
Signal output
terminal:
PHONES
(with 32 ohm load)
Tape speed Test tape:
and wow/ 3 kHz
Signal output
flutter check
and adjustment terminal:
PHONES
(with 32 ohm load)
PB frequency Test tape:
response check
Signal output
termnal:
PHONES
(with 32 ohm load)
Bias frequency Tape: Normal
check Signal output
terminal: Cassette
REC./PLAY HEAD
REC and PB
Test tape:
frequency Signal input FM22.5
response
DEV 60dB
adjustment
Emphasis
signal output
terminal: PHONES
(with 32 ohm load)
Check and adjustment procedure
1. Play back the test tape (8 kHz).
2. Adjust the head azimuth adjusting screw so that
the phase difference between the R and L
channels is minimized at an output level that is
within 2 dB of the maximum output level. After
thie adjustment, lock the head azimuth adjusting
screw with screw, sealant to cover more than a
half of the screw head.
3. When the head azimuth is maladjusted, correct it
with the head azimuth adjusting screw.
1. Play back the test tape (3 kHz) by
the end portion.
2. Connect a frequency counter and check that it
reads between 2940 and 3090 Hz. If not, adjust
the frequency with the motor semifixed resistor.
3. Check that the wow/flutter is within 0.38%
(unweighted.)
Play back the test tape while con-firming
that deviation between the 1 kHz signal and 8 kHz
signal should be 0 (+3~-6) dB.
Set the TUNER or CD function and with TAPE to
record. Check to see if the frequency at the
measuring point T360 is 60 kHz 1 kHz if not
adjst T360 until the frequency counter indicates
60 kHz 1 kHz.
At TUNER, set the BAND to the FM position, and
record the reference 1 kHz signal and 8kHz signal
alternately repeatedly. While playing back the
with
recorded signal differ from that of the 1 kHz signal
by within 0 (+3~-6) dB.
Standard value
Adjusting part
Output level:
Head azimuth
Within 2 dB of adjusting
maximum output screw (To be
level used only
Phase difference after head
L and R replacement)
channels: See Fig 3-1
Minimum
Tape
speed:
2940 to 3090 Hz Motor
semifixed
resister
Within 0.38%
check only
(unweighted)
Deviation between
1 kHz and 8 kHz:
0 (+3~-6) dB
T360
Level difference
between REC and
PB: Within 0 (+3~-6)
dB.
(No.MB066)1-13