4.3 MECHANISM COMPATIBILITY ADJUSTMENT
4.3.1 Tape transport adjustment
BACK TENSION
Mechanism adjustment is needed when DRUM ASSEMBLY or a0.93x10-3 - 1.71x10-3 N?m
part of the tape transport system is replaced. To protect tapes (10-17gf?cm)PLAY TORQUE
1.47x10-3 - 2.45x10-3 N?m
from damage, first clean the tape transport system, next confirm
(15-25gf?cm)
that nothing is wrong with the tape transport system by using a
tape that can be disposed of, and then perform adjustment with
alignment tape. Some exterior parts should be removed before
some adjustment procedures, depending on the procedures.
POLE BASE (SUP)POLE BASE (TU)
(GUIDE ROLLER)(GUIDE ROLLER)
Fig.4-3-3
TU GUIDE
4.3.3 Tape pattern
POLE
Remove the exterior parts attached to the UPPER CASE
A/C HEAD
ASSEMBLY so that the guide roller beside the DRUM ASSEMBLY
ASSEMBLY
can be rotated.
? CASE COVER(M) ASSEMBLY
? LOWER CASE ASSEMBLY
TENSION? TOP COVER ASSEMBLYPINCH
POLEROLLER? UPPER CASE (M) ASSEMBLY
NOTE:
In performing adjustment, it is recommended that LOWER
CASE ASSEMBLY and TOP OPE UNIT are attached to the
main body for better operation and safety.
POLE BASE (TU)
ALIGNMENT TAPE
(GUIDE ROLLER)
Fig.4-3-1
4.3.2 Back tension
Remove the exterior parts attached to CASSETTE HOUSING
ASSEMBLY so that scales of CASSETTE TORQUE METER can
be read.
? CASE COVER(M) ASSEMBLY
? C. COVER INSIDE
CASSETTE TORQUE METER
JIG CONNECTOR CABLE
POLE BASE (SUP)
MAIN CN25 - JIG BOARD
(GUIDE ROLLER)
12PIN(V_TP_FM)
13PIN(V_FF)
Fig.4-3-4
(1) Remove the Cover (JIG) shown on Fig.4-2-1.
(2) Connect the JIG CONNECTOR CABLE to CN25 on the
MAIN BOARD ASSEMBLY as shown on Fig. 4-2-2.
(3) Observe signal at V_TP_FM with external trigger from
V_FF on the JIG CONNECTOR CABLE.
(4) Playback the SP stairstep signal of the alignment tape and
Fig.4-3-2maximize the FM waveform by the tracking button.
(1) Set a cassette torque meter onto the deck and measure the(5) Set the tracking control to the center position by simulta-
back tension in standard PB mode to confirm that the backneously pressing the tracking (-) and (+) buttons and max-
-3-3
tension is 0.93x10 - 1.71x10 N?m. imize the FM waveform by the tracking button.
(2) If not, replace the tension band. (6) If the observed FM waveform is not flat, adjust the height of
When the value widely fluctuates in the measurement,the SUPPLY of TAKE-UP GUIDE ROLLER with the roller
replace the SUPPLY REEL DISK. driver.
(3) With the CASSETTE TORQUE METER, confirm that the
-3-3NOTE:
play torque is 1.47x10 - 2.45x10 N?m.
To prevent the tape from damage, turn the guide rollers
If necessary, replace the center pulley unit.
slowly.
(No.YF073)1-19 |
ACEC
JVC
