Service manual

GV 30…, GV 50… Drive Mechanism
GRUNDIG Service 5 - 29
k
9. Adjustments
9.1 Adjusting the Brake Band
– Activate the Service Test Mode (refer to point 6) and position the drive
mechanism so that it is in PLAY/STOP mode (display shows 05).
– Set the brake band adjuster A so that the tip of the lever
(Pos. 40100) is between the two lines on the mechanism chassis
(Fig. 9.1).
Checking the back tension:
– Play the torque meter cassette in PLAY mode.
– Check that the back tension torque is 30…50g/cm.
A
Adjust the tip of the lever between the two lines
Fig. 9.1
9.2 Checking the Reel Winding Torques (Fig. 9.2)
– Dismantle the cassette mechanism (see point 8.1).
– Cover the start-of-tape and end-of-tape sensors.
– Put the torque meter with the adapter on to the left or right reel and
set it to 0.
– Measure the torque of the right reel in Å mode after 10 seconds, and
check that it is between 60 and 110g/cm.
– Press the Ï button in PLAY mode. Measure the torque of the left
reel. The value must lie between 115 and 180g/cm.
Fig. 9.2
8.15 Capstan drive
8.15.1 Capstan brake (30800)
– Remove the spring of the capstan brake 1 (30900) (Fig. 8.40).
– Press back the clamp 2 and take out the capstan brake 3 (30800).
– When refitting the brake, make sure that the clamp 2 is freely
hooked into the chassis.
Fig. 8.40
8.15.2 Capstan motor (70500)
– Remove the drive belt 1 (20800) (Fig. 8.41).
– Undo the 3 screws 2 and remove the capstan motor.
– Assembly:
– Apply a heat-conducting paste on the shaded surface (commonly
available).
– Carefully tighten the 3 fixing screws 2 in the order a, b, c with
a torque of 3.25 to 3.75kg/cm. Clean the capstan axle.
Head conducing paste
b
c
a
Fig. 8.41