Mechanical Adjustments; Electrical Adjustments; Tape Deck Section - Sony XR-M500R Service Manual

SECTION 5

MECHANICAL ADJUSTMENTS

1. Clean the following parts with a denatured-alcohol-moistened
swab:
playback head pinch roller
rubber belt capstan
idler
2. Demagnetize the playback head with a head demagnetizer.
3. Do not use a magnetized screwdriver for the adjustments.
4. The adjustments should be performed with the power supply
voltage (14.4 V) unless otherwise noted.
• Torque Measurement
Mode Torque Meter
Forward CQ-102C
Forward
CQ-102C
Back Tension
Reverse CQ-102RC
Reverse
CQ-102RC
Back Tension
FF, REW CQ-201B
• Tape Tension Measurement
Mode Tension Meter
Forward CQ-403A
Reverse CQ-403R
24
Meter Reading
2.95 – 6.73 mN•m
30 – 65 g•cm
(0.42 – 0.90 oz•inch)
0.05 – 0.44mN•m
0.5 – 4.5 g•cm
(0.01 – 0.06 oz•inch)
2.95 – 6.73 mN•m
(25 – 55 g•cm)
(0.42 – 0.90 oz•inch)
0.05 – 0.44mN•m
0.5 – 4.5 g•cm
(0.01 – 0.06 oz•inch)
5.89 – 19.61 mN•m
60 – 200 g•cm)
(0.83 – 2.78 oz•inch)
Meter Reading
more than 90 g
(more than 3.18 oz)
more than 90 g
(more than 3.18 oz)
SECTION 6

ELECTRICAL ADJUSTMENTS

TEST MODE
<Set the Test Mode>
1. Turn ON the regulated power supply. (All LEDs on the set
lights up, and the clock is displayed.)
[OFF]
Note: Press the
button, if the clock is not displayed.
[4]
2. Push the preset button.
[5]
3. Push the preset button.
[1]
4. Press the preset button for more than two seconds.
5. Then the display indicates all lights, the test mode is set.
<Release the Test mode>
[OFF]
1. Push the button.
See the adjustment location from on page 25 for the
adjustment.

TAPE DECK SECTION

Tape Speed Adjustment
Setting:
test tape
WS-48A
(3 kHz, 0 dB)
set
AUDIO OUT REAR jack (CN300)
Procedure:
1. Put the set into the FWD PB mode.
2. Adjust adjustment resistor for inside capstan motor so that the
reading on the speed checker or frequency counter becomes in
specification.
Specification: Constant speed
Speed checker
–1.5 to +2.5%
Adjustment Location: See page 25.
0 dB=0.775 V
speed checker
or
frequency counter
10 k Ω
– +
Frequency counter
2,955 to 3,075 Hz