JVC UX-A4 - Page 54

UX-A4 B/E/G/GHEN |
Adjustment & Confirmation Methods Stand. values Adjust |
While inputting REF. — 20dB from AUX IN, perform 1.25/ 12.5 kHz
recording and replay with the norma! tape TS8 . :O0+1dB
At this time, confirm the output with VRA13(Lch) and
VRA23(Rch) so that the deviation between 1.25 kHz
and 12.5 KHz at the DOLBY TP becomes 0 + 1 dB.
Recording Test tape :
iplayback UR(Normal tape)
frequency Standard
response check frequency : 1kKHzZ
and adjustment (REF. — 200B)
Test point IN
> AUX IN
Test point OUT
‘; DOLBY TP
Reference
level
‘Monitor
@ While inputting REF.1 KHz to AUX IN perform
recording and replay with the norma! tape TS8.,
@ Adjust Lch and Reh respectively with VRA12 and
Recording
iplayback
sensitivity
Test tape :
UR (Normal tape)
Test point In
adjustment
:
AUX
IN
VRA22
so
that
the
output
at
the
DOLBY
test
point
|
fevelWithin
Test
point
out
at
this
time
becomes
O
+
1
cB.
o+1dB
:
DOLBY
TP
@
Next,
perform
recording
and
replay
with
the
chromium tape T$10 and metal tape TS11
according to the same procedures in the Step @.
@Confirm that the DOLBY TP output at this time is 0
+ 1dB.
Test tape:
UR (Normal tape)
Test point In : AUX
Test point
: DOLBY TP
Recording /
playback distortion
check
Supply 1 KHz, — 8 dBs signal to the AUX and record | Less than 5 %
it.
Play it back while checking that distortion is less than
5%.
DOLBY TP
7100
+ 0.2kHz
Switch tape select to Normal position. In case
that the bias frequency is out of specification,
L801 should be readjusted to standard and set
to Tuner, Recording position for alignment.
@ Adjust bias frequency at FM mode.
@ Confirm bias frequency at AMmode.
Bias frequency
adjustment
* Tape mode
* Test point
: DOLBY TP
42 (No. 1890)