F.cal Mode Setting Procedure - JVC TD-W717TN Service Manual

TD
-
W 717 TNC
/ J
TD
-
W 718 BKA
/ B / E / EN / G / U / UT
Compu - Calibration for F
.
CAL mode ( automatically adjustment )
F
.
CAL mode setting procedure
1
.
Short the F
.
TUNING TP and GND on mecha control board ass ' y
.
2
.
Before set the F
.
CAL mode
,
press the Counter Reset key while pressing the STOP key of deck B by reason of
cancellation
the factory setting level .
3 . Press the POWER key while pressing the FF [
] key of deck A under the power standby mode
.
At the same time
,
[ F
.
CAL ] mode is displayed on the deck B counter of FL indicator .
NOTE : When Compu
-
Calibration is finished normally ,
[ COMPU
-
CAL ] LED light up and result number of calibration is dis -
played on the
counter
of FL indicator
.
If Compu
-
Calibration is finished abnormally
,
[ COMPU
-
CAL ] LED blinks and error number of calibration is displayed
on the
counter of FL indicator
.
Then
correct
the error message and readjust the Compu
-
Calibration .
Item Condition Adjustment
Level
meter
sensitivity
adjustment
Mode
: R
EC/PAUSE
at
deck B
Test siganl level :
400 Hz or 1 kHz
, -
4 dBs
lnput : LINE IN ( L and R )
1
.
Supply a 400 Hz or 1 kHz signal to both L and R of LINE IN terminals at
-
4 dBs
.
2
.
Press the
[ COMPU
-
CAL ] key of deck B ,
adjust the level meter
sensitivity automatically
.
3 . Confirm that difference level between left and righkt within 0.3 dB
.
Playback level
adjustment at
decks A and B
Direction : FWD ( decks
A and B )
NR : OFF
Test tape : VTT
- 727
1
.
Load the VTT
-
727 test tapes to both decks A and B
.
2
.
Press the [ PLAY ] key of deck A and playing back the tape .
3
.
Press the [ COMPU
-
CAL ] key of deck A and adjust the playback
levels of both decks A and B automatically
.
Recording
charactor
adjustment
( Bias and
REC/ PB
sensitivity )
at decks A
and B
Direction : FWD ( decks
A and B )
Recrding tape :
AC - 224 ( normal )
AC
-
513 ( Cr 02 )
AC - 712 ( metal )
NR : OFF
1
.
Load the AC
-
224 tapes to both decks A and B
.
2
. Press the [ COMPU
-
CAL ] key of deck A
,
start
the recording
charactor adjustment of deck A and then deck
B automatically .
After while about
50 seconds
,
adjustment is completed automatically
.
While adjusting ,
confirm that all segment is displayed on FL indicator
.
3 . Load the AC
-
513 tapes to
both decks A and B and adjusting as the
same manner above step 2
.
Afer while about 40 seconds , adjustment is completed automatically .
4
.
Load the AC
-
712 tapes
to
both decks A and B and adjusting as the
same manner above step 2
.
After while about 40 seconds
, adjusting is completed automatically .
NOTE ; When recording the each
tapes
,
do not use while about 3 minutes
range of tape start and end winding positions
.
( No
.
4358 ) 18
-
1