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CS 48 601
Bearing of rotary head: tolerance in multi-cavity tools adapted.
Fault: Head jams when turned.
This effect occurs only in tape transports assembled with head supports pos.72 just after production start with multi-cavity
tools and appears when the drive is used (or was stored) in a climate of more than 80% relative humidity.
Head supports produced with multi-cavity tools can be identified by a 2 digit marking — see fig.1
Bad head supports, where the failure can occur, have only been used in tape transports produced from production week
9024 up to 9031 — hot stamped in the chassis 024xA up to 031xA ( x stands for the production day 1—5, A or B stands for
the shift which the part was produced in ).
For service purposes the complete transport mechanism RRO assy 4822 691 10294 is available.
The large digit stands for the tool number.
The small digit stands for the cavity of this tool.
Delay board
To ensure a reliable switch over of the MODE SELECTOR to "normal mode" after full auto shutoff, an electronic delay—circuit
was added to all auto reverse tape transports with production change code WT01.
For this electronic delay circuit there were 2 different versions available —> for schematic diagrams and assembly drawings
see next two pages.
From production week 9042 with change code WT02 onwards this electronic delay—circuit has been replaced by a
mechanical solution:
lever pos. 70 changed
lever pos.106 added
4822 403 70385
Attention: Lever pos.106 is not mounted on all RROPb (4822 691 10294), RR-RECI/0 (4822 691 10295) and
RR-RECII/O (4822 691 20665) tape transports, available for service purposes —> because of the changed lever pos.70 the
auto—shutoff function does not work without lever pos. 106!
lf a tape transport with change code WT01 will be exchanged by a tape transport with change code WT02 lever pos. 106 has
to be ordered extra and mounted on the new tape transport. —> see fig.2
From June 92 onwards it is organized that the tape transports will be delivered with lever pos.106 mounted.
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