Sharp VL-SW50U Service Manual page 20

vL-sw5ou
5-3-2. Checking the take-up torque for playback (recording)
(1)
Set the torque cassette (8T-012) in position, and check in the SP-mode recording mode (tape recorded in SP mode)
that the torque at the tape taking-up side is within the standard range.
Standard of take-up torque for SP-mode recording (playback)
9 +, 3 gem with ripples less than 4 gem
(If the torque ripples appear, read the center value of torque between the ripples.)
5-3-3. Checking and adjusting the back tension torque for playback (recording)
(1) Checking
1) Set the torque cassette (8T-012) in position, and check in the SP-mode recording mode (tape recorded in SP mode)
that the torque at the tape supply side is within the standard range.
Standard of back tension torque for SP-mode recording (playback):
8 & 2 gem with ripples of less than 2 gem
(Torque ripple must be within 8 + 2 gem)
(2) Adjustment
1) If the back tension torque is not within the standard range, adjust the tension spring hooking position. If the back
tension is too high, hook the spring in the direction A. If the back tension is too low, hook the spring in the direction
B .
Note:
1. After back tension torque adjustment be sure to check the tension pole position.
5-3-4. Checking and adjusting the tension pole position
(1) Check
When winding of P6-120 tape is started, check whether the tension pole is in the specified position against Si roller
as shown or not.
If it is not in the specified position, remove the cassette and adjust the position in the following procedure.
(2) Adjustment
(2)-l. Don't set up any tape, and select the PB mode. (Refer to Item 5-5-l-(4).)
2. Slightly loosen the screw (1) (to such a strength as the T band holder B can be moved).
3. If the tension pole is in the inner position than specified, dislocate the T band holder B in the arrow (A) direction
and if it is in the outer position, dislocate it in the arrow (B) position. Then, tighten the screw (1). (For reference,
dislocate it 0.4 to 0.8 mm outer from the position specified above.) For the position adjustment, it is convenient
to use the position adjustment screwdriver (JiGDRiVERMX7U2). (Set it in the hole (C).)
4.Check the position in the "(1) Check" procedure described above.
5. If it is not in the specified position, repeat the adjusting procedure 1 thru 3.
5-6