Mechanical Adjustment; Pinch Roller; Winding Torque; Tape Speed Adjustment - Akai HX-M10 Service Manual

V. MECHANICAL ADJUSTMENT
5-1. PINCH ROLLER PRESSURE
MEASUREMENT
Oto 400 gr
0G 10 ? . SPRING GAUGE
PINCH ROLLER
SPRING
PINCH ROLLER
Fig. 5-1
Put in PLAY mode. Push pinch roller arm down with the
spring gauge, push the pinch Roller | to 2 mm from the
Capstan and release slowly. Read the spring gauge at
the moment the pinch roller touches the capstan and
begins to rotate. Specified contact pressure measure-
ment. If there is no measurement obtained, Adjust or
Replace the pinch Roller spring.
200 to 400 grm
5-2. WINDING TORQUE MEASUREMENT
IN EACH MODE
—— TORQUE METER
Insert cassette torque meter (AJ-751179) and measure
in each mode.
PLAY mode
Take up Torque: 35 to 75 grm-cm
Back tension torque: | to 6 grm-cm
FAST FORWARD, REWIND mode
Take up Torque: 70 to 160 grm-cm
5-3. TAPE SPEED ADJUSTMENT
TAPESPEED ADJ
VOLUME
CAPSTAN MOTOR
Fig. 5-3
Connect a frequency Counter to Line output ter-
minals. Play Back a 1,000Hz Tape Speed Test Tape
(AT-750774) or 3,150Hz Tape Speed Test Tape
(AT-751263) and adjust a Tape Speed Adjustment
Volume (see Fig. 5-3) to obtain a tape speed of
1,000 Hz + 10 Hz, or 3,150 + 30 Hz. -
5-4. REC/PB HEAD AZIMUTH ADJUSTMENT
ERASE HEAD PB/REC HEAD
AZIMUTH
ALIGNMENT
SCREW
Fig. 5-4
Play Back a 10kHz Azimuth Alignment tape (AT-
750778) and Adjust the Azimuth Alignment Screw,
until the output levels of both channels are maximum.
After Adjustment, Paintlock the Azimuth Alignment
Screw.
5-5. JOINT REC ADJUSTMENT
SWI (ON THE PRE AMP PCB)
JOINT REC
ADJUSTMENT
POINT
Fig. 5.5
Adjust adjustment point of JOINT REC so that SW1 is
pulled completely at REC mode, it is released at PB
mode.
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