JVC DD-9 A - Page 12

DD-9A/B/C/E/J/U |
NOTES: * After adjustment, confirm by ear that recorded 4. Adjusting record/playback head azimuth
sounds on the metal tape are completely erased. Adjust the head angle with the screw(1) until the reading
* After replacement of the erase or record/play- of the electronic voltmeter becomes maximum for both
back head, slacken the associated wire, clamp channels.
the new head, then confirm that this new head
performs normal operation.
Adjusting| Standard
point value Remarks
Adjustment
Employ a torque testing cassette tape 40—70 | If the standard torque is not obtained,
for the checking. replace the take-up disc assembly.
Checking fast Measure the torque in the fast forward If the standard torque is not obtained,
forward torque mode in the same manner as in the clean the motor pulley, idler disc cir-
above. cumference.
Checking rewind | Measure the torque in the rewind mode
torque in the same manner as in the above.
Checking wow Connect a wow and flutter meter to
and flutter LINE OUT terminals.
Play back the VTT-656A-S test tape.
Check to see if the reading of the meter
is within 0.019% (WRMS).
This semi-fixed resistor
is no adjustment.
Damping gear oil
Oil employed — Torque grease specified by JVC (KANTO KASEI GP-608V)
Applying method — Apply in both concaved sections as shown in the figure 13.
Apply oil here.
é
No. 4198
=10=