Lyrec TR532 Series, Manual

Page: 50 / 195

7.5 GUIDE ROLLER PRESSURE
Use the same procedure to adjust the guide roller pressure to
1.2 kp +/- 20 %. Drawings 7.03B and 7.03C.
7.6
ROLLER PERPENDICULARITY, drawing No. 7.04
The two large rollers related to each tension arm, the GUIDE ROLLER
and the CAPSTAN PINCH ROLLER, are adjusted to be perpendicular to the
TAPE DECK by means of three set screws in their bases. To reach them
their covers are removed and a 2 mm Allen key inserted in the hole
seen within the top of the roller. Rotating the roller it is possible
to find the head of the screw with the Allen key. At each of the three
positions place the ALIGNMENT TEMPLATE against the side of the roller
and check for perpendicularity and height. Adjusting each screw in
turn will tilt the roller accordingly. It will also affect the height
so that the three screws must be properly related to each other in
order to obtain both perpendicularity and correct height with regard
to the TAPE DECK. In some cases it may be necessary to loosen or
tighten the center screw which holds the roller assembly
in place. The
final adjustments of the TAPE PINCH ROLLER must be made after the HEAD
BLOCK adjustments are made (section 7.7), with the tape running.
CAUTION: When making these adjustments be very careful to remove the
adjustment key from the roller before pressing the START
button, otherwise the pinch roller will be jammed against the
capstan.
7.7
UPPER CAPSTAN BEARING POINT
Place a 20.000 ohms/V DC voltmeter across the test point in code 3
card and chassis ground. Loosen the upper capstan bearing point and
set the tape in motion. Watch the voltmeter reading, which should
stabilise around 2.7 V, and gently press the upper capstan bearing
against the capstan. If the pressure is too high the current through
the motor will increase, showing a higher reading on the voltmeter.
Adjust the position of the bearing point so that it is in contact with
the capstan but the voltmeter reading does not increase. At this point
tighten the locking screw.
CAUTION: Make sure the bearing is properly lubricated.
See section 8.12.
7.8
MECHANLCAL BRAKES, drawing no. 7.05B
Mechanical brake tension should be set to a minimum. This is obtained
when brake tension is just sufficient to keep the servo-arms from
reaching their rest position, with full reel at either take-up or
supply reel. If necessary, loosen locknut B and adjust screw A to
obtain a correct tension. Then tighten locknut B.
1977-05-01 TR532 7.8