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Mechanical Adjustments; Electrical Adjustments; Test Mode; Tape Deck Section - Sony XR-4900 Service Manual

Fm/mw/sw cassette car stereo
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SECTION 4
QQ

MECHANICAL ADJUSTMENTS

3 7 63 1515 0
1. Clean the following parts with a denatured-alcohol-moistene
swab:
playback head pinch roller
rubber belt
capstan
idlers
2. Demagnetize the playback head with a head demagnetizer.
3. Do not use a magnetized screwdriver for the adjustments.
4. After the adjustments, apply suitable locking compound to the
parts adjusted.
5. The adjustments should be performed with the power supply
voltage unless otherwise noted.
• Torque Measurement
Mode
Torque Meter
Forward
CQ-102C
Forward
CQ-102C
Back Tension
Reverse
CQ-102RC
Reverse
CA-102RC
Back Tension
FF, REW
CQ-201B
• Tape Tension Measurement
Mode
Tension Meter
TE
L 13942296513
Forward
CQ-403A
Reverse
CQ-403R
www
.
http://www.xiaoyu163.com
Meter Reading
30 – 65 g•cm
(0.42 – 0.90 oz·inch)
0.5 – 4.5 g•cm
(0.01 – 0.06 oz·inch)
30 – 65 g•cm
(0.42 – 0.90 oz·inch)
0.5 – 4.5 g•cm
(0.01 – 0.06 oz·inch)
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)
x
ao
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y
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– 14 –
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SECTION 5

ELECTRICAL ADJUSTMENTS

2 9
8

TEST MODE

This set have the test mode function. In the test mode, FM Auto
Scan/Stop Level and MW Auto Scan/Stop Level adjustments can
be performed easier than it in ordinary procedure.
<Set the Test Mode>
1. Set the "power select" switch (S501) is "A" position.
2. 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]
3. Push the preset
button.
[5]
4. Push the preset
button.
[1]
5. Press the preset
button for more than two seconds.
6. Then the display indicates all lights, the test mode is set.
<Release the Test mode>
[OFF]
1. Push the
button.
2. Return the "power select" switch (S501) to initially set posi-
tion.
See the adjustment location from on page 17 for the
adjustment.

TAPE DECK SECTION

Tape Speed Adjustment
Setting:
test tape
Q Q
WS-48A
3
6 7
1 3
1 5
(3 kHz, 0 dB)
set
AUDIO OUT jack (J331)
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 17.
co
.
9 4
2 8
0 dB=0.775 V
speed checker
or
frequency counter
0 5
8
2 9
9 4
2 8
10 k Ω
+
Frequency counter
2,955 to 3,075 Hz
m
9 9
9 9

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