Mechanical Adjustments; Electrical Adjustments; Test Mode; Tape Deck Section - Sony XR-4880 Service Manual

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SECTION 4

MECHANICAL ADJUSTMENTS

1. Clean the following parts with a denatured-alcohol-moistened
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
Forward CQ-403A
Reverse CQ-403R

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 "OFF" mode.
2. Push the preset
3. Push the preset
4. Press the preset
5. Then the display indicates all lights, the test mode is set.
<Release the Test mode>
1. Push the
Meter Reading
30 - 65 g•cm
See the adjustment location from on page 16 for the
(0.42 - 0.90 oz•inch)
adjustment.
0.5 - 4.5g•cm
(0.01 - 0.06 oz•inch)

TAPE DECK SECTION

30 - 65 g•cm
(0.42 - 0.90 oz•inch)
0.5 - 4.5g•cm
Tape Speed Adjustment
(0.01 - 0.06 oz•inch)
Setting:
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)
Procedure:
1. Put the set into the FWD PB mode.
2. Adjust adjustment resistor for inside capastan motor so that
Specification: Constant speed
Adjustment Location: See page 16.
– 13 –
SECTION 5

ELECTRICAL ADJUSTMENTS

[4]
button.
[5]
button.
[1]
button for more than two seconds.
[OFF]
button.
frequency counter
test tape
WS-48A
4 Ω
(3 kHz, 0 dB)
set
speaker out terminal
the reading on the speed checker or frequency counter becomes
in specification.
Speed checker
–1.5 to +2.5%
0 dB= 0.775 V
speed checker
or
– +
Frequency counter
2,955 to 3,075Hz