Mechanical Adjustments; Electrical Adjustments; Test Mode; Tape Deck Section - Sony XR-C6120 Service Manual

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MECHANICAL ADJUSTMENTS

3 7 63 1515 0
1. Clean the following parts with a denatured-alcohol-moistened
swab:
playback head
rubber belt
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
Forward
Forward
Back Tension
Reverse
Reverse
Back Tension
FF, REW
• Tape Tension Measurement
Mode
Forward
TE
L 13942296513
Reverse
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SECTION 4
pinch roller
capstan
Torque Meter Meter Reading
30 – 65 g•cm
CQ-102C
(0.42 – 0.90 oz•inch)
0.5 – 4.5 g•cm
CQ-102C
(0.01 – 0.06 oz•inch)
30 – 65 g•cm
CQ-102RC
(0.42 – 0.90 oz•inch)
0.5 – 4.5 g•cm
CQ-102RC
(0.01 – 0.06 oz•inch)
60 – 200 g•cm
CQ-201B
(0.83 – 2.78 oz•inch)
Tension Meter Meter Reading
more than 90 g
CQ-403A
(more than 3.18 oz)
more than 90 g
CQ-403R
(more than 3.18 oz)
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ELECTRICAL ADJUSTMENTS

8

TEST MODE

<Set the Test Mode>
1. Set the "power select" switch (S501) is "A (ON)" position.
2. Turn ON the regulated power supply. (All LEDs on the set
lights up, and the clock is displayed)
Note: Press the
3. Push the preset
4. Push the preset
5. Press the preset
6. Then the display indicates all lights, the test mode is set.
<Release the Test mode>
1. Push the [OFF] button.
2. Return the "power select" switch (S501) to initially set posi-
tion.
See the adjustment location from on page 15 for the
adjustment.

TAPE DECK SECTION

Tape Speed Adjustment
Setting:
test tape
WS-48A
(3 kHz, 0 dB)
Q Q
3 6 7 1 3
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 15.
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– 13 –
SECTION 5
2 9 9 4 2 8
[OFF]
button, if the clock is not displayed.
[4]
button.
[5]
button.
[1]
button for more than two seconds.
0 dB=0.775 V
speed checker
frequency counter
10 k Ω
set
1 5 0 5 8 2 9 9 4
AUDIO OUT REAR jack (J331)
Frequency counter
2,955 to 3,075 Hz
m
co
9 9
or
– +
2 8 9 9