Mechanical Adjustment; Pinch Roller; Winding Torque; Tape Speed Adjustment - Akai HX-R44 Service Manual

V. MECHANICAL ADJUSTMENT
5-1 PINCH ROLLER PRESSURE MEASUREMENT (Refer to Fig. 5-1)
REV
PINCH ROLLER
REV
PINCH ROLLER
SPRING
PINCH ROLLER SHAFT
Put in FWD PLAY Mode. Push pinch roller shaft down
with the spring gauge, and push the pinch roller 1 to 2
mm away from the capstan and release slowly.
Read the spring gauge at the moment the pinch roller
5.2 WINDING TORQUE MEASUREMENT
IN EACH MODE (Refer to Fig. 5-2)
CASSETTE TORQUE METER
Insert a cassette torque meter (AJ-751179) and measure
in each mode.
For Fast Forward and Rewind, measure at the end of
the tape when the tape has stopped running.
Forward of Reverse mode
Take up Toque: 25 to 45 g-cm
Back Tension Torque: 2 to 5 g-cm
Fast Forward or Rewind mode
Take up Torque: 70 to 150 g-cm
270 to 370 grm |
FWD
PINCH ROLLER
FWD
PINCH ROLLER
SPRING
PINCH ROLLER SHAFT
Fig. 5-1
touches the capstan and begins to rotate. Specified
contact pressure measurement is 270 to 370 grams.
If the correct measurement is not obtained, replace the
pinch roller spring. Do the same for the reverse side.
5-3 TAPE SPEED ADJUSTMENT
(Refer to Fig. 5-3)
CAPSTAN MOTOR
SY
2
TAPE SPEED ADJ VR
Fig. 5-3. Location of Tape Speed Adjustment
Variable Resistor
Connect a frequency counter to Line Output terminal.
Playback a 1 ,OOOHz pre-recorded Test Tape (AT-750744),
or 3,150 Hz pre-recorded Test Tape (AT-751263), and
adjust the Tape Speed Adjustment Variable Resistor
(See Fig. 5-3) to obtain a tape speed of 1,000 + 3 Hz, or
3,150 + 10 Hz.
SERVICE MANUAL HX-R44