RXD-M57MP
4
ADJUSTMENT
SERVICE ADJUSTMENT
Lubrication
The mechanical parts are factory coated with a thin coat of light grease and should not require further
lubrication. If a light grease is applied, be careful not to get any grease on the play/record head or erase
head, hubs, pulleys, tapes reels, drive belts, or switches. Use a good lubricant such as Silicon Lube G322L
or Lubricate.
Service Check
Before aligning the mechanism, wipe off any accumulated dirt with denatured alcohol. Wipe around parts
where the tape contacts and around all rotating parts. Drive belts are specially processed. Do not clean
them with alcohol.
Mechanical Torque
Use a cassette type torque gauge and check the tape mechanism.
Take-up torque
35 to 70 g-cm
Rewind torque
50 g-cm min.
Fast forward torque
50 g-cm min.
Pinch Wheel Pressure
No adjustment to the pinch roller spring is necessary. It should be sufficient to give at least 40 g-cm pull
force.
Tape Head Servicing
Each time the unit is serviced, the face of all heads should be thoroughly cleaned with denatured alcohol or
commercial head cleaning solution. The playback head should be demagnetized with a commercial
demagnetizer. Accumulation of tape oxide during normal operations can cause problems, including loss of
high frequencies and wow and flutter.
Erase Head
The erase head is properly aligned when the tape rides directly between the tape guide on the head without
crinkling the tape.
Play/Record and Playback Head Azimuth Adjustment
To adjust the play/record and playback head azimuth screw:
1. Connect two (2) VTVMs and a dual trace scope to the stereo headphone jack (as shown) with a 32
ohm dummy load. (See Figure 1.)
VTVM
VTVM
DUMMY LOAD
JK400
SCOPE
CH1
CH2
Figure 1. Azimuth Adjustment
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