Wurlitzer One More Time Vinyl, Operating Instructions Manual

Page: 29 / 42

Notes
OMT VINYL – edition: 13.08.2007
27
18.9.9 Note 7
A detail of circuit timing: Main cam motor MM is started by relay 2 of the S&CC for about 3 seconds.
After this the transfer switch K6 should have made well within these 3 seconds. If K6 is maladjusted
or defective, the main gripper arm is about half between the record carrier and the turntable.
18.9.10 Note 8
The amplifier muting is governed by an electronic circuit by transistor Tr2 and controlled by switch K1
via the grey line, pole 8, amplifier-to-changer cable. The amplifier is mute as long as this line is
grounded, hence, the amplifier works outside the jukebox with microphone kit adapter without any
need to alter the mute circuit.
18.9.11 Note 9
The gripper arm is linked with the cam & gear shaft by a two-way spring clutch. If the record is locked
somehow with the turntable and the arm is unable to take it off, the gear box still does advance and
load the clutch spring. Finally, the spring at a certain tension will free the record and then the arm
flips to catch up. Then the record is thrown about and may land in a wrong compartment or
anywhere.
A maladjusted turntable chassis linkage may force the turntable too far to the right, thus ’pinching’
the record between the turntable pilot and the arms’ upper clamp, especially if this is positioned
deeper than the plane of the record. Such a situation may lock the system turntable (at pilot) - record
- gripper arm.
With a main cam & gear unit generally moving too fast, the arm may run the returning record into the
neighbour compartment or even loose it. A complete gear cycle normally takes about 12 seconds,
never permit time shorter than 10 seconds. To check time, make a selection and hold the cancel
button (amplifier) down all the time the arm moves. Time is counted from the moment the record
carrier stops until the homed record is unclamped and microswitch K8 is actuated.
If there is a second record in one compartment and the original record is selected, there is a 50%
chance that the wrong one will be played. The service call to be expected in such case will be likely
one of a ’wrong selection’.
When taking two records the gripper arm may lose the one of the smaller diameter and that may be
the original one. This counts for the strange situation that a record is found laying about with another
one found in that record compartment - a remote chance anyhow.
18.9.12 Note 10
Transistor T22 pulls its collector to L as soon as the negative supply of the changer appears at the
switch of relay 4 thus indication that the record just been played is back now in the carrier. If this
circuit is defective the S&CC does not sense this but ’thinks’ the record is still playing. Hence it will
not start a new search run although it has accepted coins and selections properly.
For a start short the collector of T22 to ground momentarily. An external test can be made via the
service program, button 9. Typical for this fault is that a selection accepted will be played after the
S&CC was switched off for a second or two.