Sony TC-730 Service Manual page 22

Checks After Mechanical Adjustment
a)
Torque Check
FWD, REV torque ... more than 200g. cm
(2.78 oz. inch)
FF, REW torque..... more than 100 g. cm
(1.39 oz. inch)
FWD, REV back tension
eke ote a thes 200 — 240g. cm*
(2.78—3.32 oz. inch)
FF, REW back tension
(0.83—1.1 oz. inch)
* : adjustable
After making adjustments, clean the following
parts with a soft cloth dampened with denatured
alcohol; head core, tape guide, pinch roller,
scrape filter roller, brake contact part of the
reel table.
Tape Contact Check of Scrape Filter Roller
Thread a 7-inch tape along the tape path and set
the tape speed switch to the 4.8 cm/s position.
b) Run the tape. Make sure that the scrape filter
roller is rotating. Stop the roller by fingers.
Make sure that the roller starts rotating again
when taking off the fingers from the roller.
If necessary, adjust the position of the scrape
filter roller by loosening the screw.
Wow and Flutter Measurement
Make measurements at the beginning and the
end of the tape. The measurement may be done
with the unit set to either FWD and REV
mode.
—~24—
*At 19 cm/s (7-1/2 ips) and 9.5 cm/s (3-3/4 ips)
tape speed
Steps
(1) Connect a wow meter and a 100-kQ resistor in
parallel with the LINE OUT jack.
(2) Set the MONITOR switch to TAPE.
(3) Play back the alignment tape indicated below.
(4) Make sure that the satisfied result is obtained
on the wow meter.
19 cm/s Play back SONY
(7-% ips) alignment tape
WS-19-7
less than
0.12 %
(RMS)
Play back SONY
alignment tape
WS-9-7
less than
0.15 %
(RMS)
9.5 cm/s
(3-% ips)
*At 4.8 cm/s (1-'/8 ips) tape speed
Steps
(1) Set the record volume controls to the position
specified in Precaution (8) on page 25.
(2) Connect a wow meter and a 100-kQ resistor in
parallel with the LINE OUT jack.
(3) Set the MONITOR switch to TAPE.
(4) Deliver a 3-kHz signal of -60 dB (-10 dB) to the
MIC (AUX) jack.
(5) Record the signal on the blank tape.
(6) Make sure that the satisfied result is obtained
on the wow meter.
Specification less than 0.40 % (RMS)