Mechanical Adjustments; Electrical Adjustments; Tape Deck Section; Tuner Section - Sony XR-CA600X Service Manual

SECTION 4

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 Meter Reading
2.95 – 6.37 mN•m
Forward CQ-102C (30 – 65 g•cm)
(0.42 – 0.90 oz•inch)
0.05 – 0.44 mN•m
Forward
CQ-102C (0.5 – 4.5g•cm)
Back Tension
(0.01 – 0.06 oz•inch)
2.95 – 6.37 mN•m
Reverse CQ-102RC (30 – 65 g•cm)
(0.42 – 0.90 oz•inch)
0.05 – 0.44 mN•m
Reverse
CQ-102RC (0.5 – 4.5g•cm)
Back Tension
(0.01 – 0.06 oz•inch)
5.89 – 19.61 mN•m
FF, REW CQ-201B (60 – 200 g•cm)
(0.83 – 2.78 oz•inch)
• Tape Tension Measurement
Mode Tension Meter Meter Reading
more than 60 g
Forward CQ-403A
(more than 2.12 oz)
more than 60 g
Reverse CQ-403R
(more than 2.12 oz)
SECTION 5

ELECTRICAL ADJUSTMENTS

TAPE DECK SECTION

0 dB=0.775 V
Tape Speed Adjustment
Setting:
test tape
WS-48A
frequency counter
(3 kHz, 0 dB)
10 kΩ
+
set
–
AUDIO OUT jack (CNJ151)
Procedure:
1. Put the set into the FWD PB mode.
2. Adjust adjustment resistor for inside capstan motor so that the
reading on the frequency counter becomes 3,000 Hz.
Specification: Constant speed
Frequency counter
2,955 to 3,075 Hz
Adjustment Location:
– SET UPPER VIEW –
Tape Speed Adjustment

TUNER SECTION

Tuner section adjustments are done automatically in this set.
6-1.

NOTE FOR PRINTED WIRING BOARDS AND SCHEMATIC DIAGRAMS

Note on Printed Wiring Board:
• X : parts extracted from the component side.
• Y : parts extracted from the conductor side.
• : Pattern from the side which enables seeing.
Caution:
Pattern face side: Parts on the pattern face side seen from
(Conductor Side) the pattern face are indicated.
Parts face side: Parts on the parts face side seen from
(Component Side) the parts face are indicated.
• Waveforms
– MAIN Board –
1 IC501 qs (OSCOUT)
3.2 Vp-p
54.2 ns
2 IC501 qh (XOUT)
5.1 Vp-p
30.6 µ s
15 15
XR-CA600X/CA620X
SECTION 6

DIAGRAMS

Note on Schematic Diagram:
• All capacitors are in µF unless otherwise noted. pF: µµF
50 WV or less are not indicated except for electrolytics
and tantalums.
• All resistors are in Ω and
1 / W or less unless otherwise
4
specified.
• C : panel designation.
• A : B+ Line.
• Power voltage is dc 14.4V and fed with regulated dc power
supply from ACC and BATT cords.
• Voltages and waveforms are dc with respect to ground
under no-signal (detuned) conditions.
no mark : FM
( ) : AM
〈〈 〉〉 : TAPE PLAYBACK
∗
: Impossible to measure
• Voltages are taken with a VOM (Input impedance 10 MΩ).
Voltage variations may be noted due to normal produc-
tion tolerances.
• Waveforms are taken with a oscilloscope.
Voltage variations may be noted due to normal produc-
tion tolerances.
• Circled numbers refer to waveforms.
• Signal path.
F
: FM
f
: AM
E
: TAPE PLAYBACK
L : BUS AUDIO IN
– KEY Board –
3 IC501 uf (OSC)
2.6 Vp-p
21.6 µ s