Pad Pressure - Panasonic RS-736US Service Manual

TAKEUP TENSION AND BACK TENSION DURING REWIND
Instruments Required: Tension Gauge, Splicing Tape
1. In order to measure the Takeup Tension, place a Tull
reel of 7" Tape on the Supply Reel Table and place
the set into the Rewind mode. Then measure it in
the same way as for measurement Takeup Tension
during Record/Playback.
2. In order to measure the Back Tension, place a Tull
reel of 7" Tape on the Right Reel Table and place the
set into the Rewind mode. Then measure it in the
same way as for measurement during Record/Play-
back.
PAD PRESSURE
Mesuring Method:
Instrument Required: Tension Gauge
1. Place the set into the Playback mode without loading
the Tape.
2. Apply the Tension Gauge to the center of the Pad
and move the Pad away from the Head slowly. Read
the value when it first separates.
3. The standard Pad Pressure is:
Pad Pressure during Recording/Playback:
20~30 gr
Pad Pressure for Erasing: 15~25 gr
Adjusting Method:
Adjust the Pad Spring
(in order to increase the Pad Pressure)
Takeup Tension during Rewind: more than 100 gr
Back Tension during Rewind: 5~12 gr
As amatter of course, the Tape Reel must be of the
maximum diameter applicable to the set.
Adjusting Method:
If the Takeup Tension is too low, the causes might be
either low Rewind Belt tension insufficient Rewind Pulley
pressure, lack of oil on the Supply Reel Table Shaft, oil
on the Belt and the Motor Pulley, etc. It the Back
Tension is abnormal, the causes might be either that the
Spring under the Takeup Reel Table Shaft is dirty or
needs oil.
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contact between Head and Tape, and also deteriorates
sensitivity and frequency response. Attention should
therefore be paid to this Pad Pressure.
(Tape Pad) Pad
Pull it
t upward
ay Bend it
\
Pad Spring
(In order to lower the Pad Pressure)
Pull it
downward
Fig. 13