Sony XR-C6090 Service Manual ▷ View online
– 13 –
SECTION 4
MECHANICAL ADJUSTMENTS
1. Clean the following parts with a denatured-alcohol-moistened
swab:
playback head pinch roller
rubber belt
rubber belt
capstan
idler
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
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
Tension Meter
Meter Reading
Forward
CQ-403A
more than 90 g
(more than 3.18 oz)
Reverse
CQ-403R
more than 90 g
(more than 3.18 oz)
•
Tape Tension Measurement
Mode
Torque Meter
Meter Reading
Forward
CQ-102C
30 - 65 g•cm
(0.42 - 0.90 oz•inch)
Forward
CQ-102C
0.5 - 4.5g•cm
Back Tension
(0.01 - 0.06 oz•inch)
Reverse
CQ-102RC
30 - 65 g•cm
(0.42 - 0.90 oz•inch)
Reverse
CQ-102RC
0.5 - 4.5g•cm
Back Tension
(0.01 - 0.06 oz•inch)
FF, REW
CQ-201B
60 - 200 g•cm
(0.83 - 2.78 oz•inch)
SECTION 5
ELECTRICAL ADJUSTMENTS
Tape Speed Adjustment
Setting:
Procedure:
1. Put the set into the FWD PB mode.
2. Adjust adjustment resistor for inside capstan motor so that the
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.
Specification: Constant speed
Adjustment Location: See page 14.
set
+
–
test tape
WS-48A
(3 kHz, 0 dB)
WS-48A
(3 kHz, 0 dB)
speaker out terminal
4
Ω
speed checker
or
frequency counter
Speed checker
Frequency counter
–2 to +3%
2,940 to 3,090 Hz
Procedure:
1. Put the set into the FWD PB mode.
2. Adjust RV231 (L-CH) and RV131 (R-CH) so that the level
1. Put the set into the FWD PB mode.
2. Adjust RV231 (L-CH) and RV131 (R-CH) so that the level
meter reading is –6±1 dB (0.35 to 0.44 V).
Adjustment Location: See page 14.
Dolby Level Adjustment
Setting:
Preset 3 (DOLBY) button
: NR OFF
SEL (BAS) button
: Center
SEL (TRE) button
: Center
SEL (BAL) button
: Center
SEL (FAD) button
: Center
SEL (VOL) button
: Maximum
D-BASS control
: OFF
set
+
–
–
test tape
P-4-D400
(400Hz, 0dB)
P-4-D400
(400Hz, 0dB)
MAIN board
level meter
MAIN board
TP (DOLBY )
TP (GND)
L-CH: IC301
7
R-CH: IC301
@¢
TAPE DECK SECTION
0 dB=0.775 V
TUNER SECTION
Tuner Section is no Adjustment.
– 14 –
Adjustment Location:
– SET UPPER VIEW –
TP (GND)
S501
POWER SELECT
SWITCH
B (OFF)
↔
A (ON)
R-CH
L-CH
L-CH
TP (DOLBY)
Dolby Level Adjustment
Dolby Level Adjustment
– SET BUTTON VIEW –
Tape Speed Adjustment
RV131
(R-CH)
RV231
(L-CH)
(L-CH)
Dolby Level
Adjustment
– 20 –
• Waveforms
1
IC1
1
(XO)
2
IC501
^ª
(OSCOUT)
3.8 Vp-p
138.5 ns
5.3 Vp-p
200 ns
3
IC501
&™
(XT_OUT)
5.2 Vp-p
31
µ
s
– 25 –
• IC Block Diagrams
– MAIN Board –
IC1
BU2624F-E2
IC161
LC75373ED
PHASE
DET
PRESCALER
MAIN
COUNT
IF COUNT
CTL
20BIT COUNT
SHIFT REGISTER LATCH
REFERENCE
DIVIDER
I/O
CTL
1
2
4
5
6
7
9
10
20
18
17
16
15
14
13
12
11
11
19
XIN
CE
CK
DA
CD
P0
P1
P3
XOUT
VSS
PD
VDD
FMIN
AMIN
P2
IFIN
SD
P4
P4
+
–
–
+
–
–
+
–
–
+
–
+
–
+
–
+
–
–
+
–
–
+
–
+
–
+
–
+
–
–
+
–
–
+
–
–
+
–
+
–
DECODER
LATCH
SHIFT
REGISTER
CONTROL
–
+
+
–
–
1
2
3 4
5
6 7 8
9 10
20
19
18
17
16
15
14
13
12
11
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
43
44
LSELO
L4
L3
L3
L2
L1
VDD
R1
R2
R3
R4
R4
RSELO
RVRIN
RCOM
RT1
RT2
RT3
RTOUT
RSIN
RS1
RS2
RS3
RSOUT
RFIN
RFOUT
RROUT
VSS
CL
DI
CE
VREF
LROUT
LFOUT
LFIN
LSOUT
LS3
LS2
LS1
LSIN
LTOUT
LT3
LT2
LT1
LCOM
LVRIN
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