Sony TC-TX5 Service Manual ▷ View online
– 5 –
Record/Playback Head Azimuth Adjustment
Procedure:
1. Mode : REV playback
1. Mode : REV playback
2. Turn the adjustment screw for the maximum output levels. If
these levels do not match, turn the adjustment screw until both
of output levels match together within 1 dB.
of output levels match together within 1 dB.
Screw
position
position
L-CH
peak
peak
within
1dB
1dB
output
level
level
L-CH peak
R-CH peak
within
1dB
1dB
angle
R-CH
peak
peak
3. Phase Check
Mode : playback
+
–
–
V
H
+
–
Screen pattern
Good
Wrong
in phase 45
°
90
°
135
°
180
°
LINE OUT
set
R-CH
L-CH
47 k
Ω
47 k
Ω
oscilloscope
test tape
P-4-A100
(10 kHz, –10 dB)
P-4-A100
(10 kHz, –10 dB)
+
–
–
set
47 k
Ω
LINE OUT
level meter
Test tape
P-4-A100
(10 kHz, –10 dB)
P-4-A100
(10 kHz, –10 dB)
4. Set in the FWD mode and repeat the step 1 to 3.
5. After the adjustment, lock the screw with locking compound.
5. After the adjustment, lock the screw with locking compound.
Adjustment Location: Record/Playback head
FWD side
REV side
Adjustment screw
Tape Speed Adjustment
Procedure:
Mode: FWD playback
Mode: FWD playback
+
–
–
set
LINE OUT
frequency counter
test tape
WS-48B
(3 kHz, 0 dB)
WS-48B
(3 kHz, 0 dB)
47 k
Ω
1. Set to FWD playback mode.
2. Adjust RV801 so that the frequency counter reading becomes
2. Adjust RV801 so that the frequency counter reading becomes
2,980 ± 30 Hz.
3. Confirm that the deviation between tape top and tape end is within
3%.
Playback Level Adjustment
Procedure:
Mode: FWD playback
Mode: FWD playback
Adjust RV151 (L-CH) and RV251 (R-CH) so that the reading on
level meter meets the adjustment limits below.
level meter meets the adjustment limits below.
Adjustment Limits:
LINE OUT level: –4.7±0.5 dB (0.43 to 0.48 V)
Level difference between channels: within 2 dB
Level difference between channels: within 2 dB
Check that the LINE OUT level does not change even if Playback
and Stop operation is repeated several times.
and Stop operation is repeated several times.
Adjustment Location: DECK board
Adjustment Location:
[DECK BOARD] (Component side)
+
–
–
set
LINE OUT
47 k
Ω
test tape
P-4-L300
(315 Hz, 0 dB)
P-4-L300
(315 Hz, 0 dB)
level meter
IC305
CN352
T351
RV252
Record BIAS(R-CH)
RV152
Record BIAS(L-CH)
RV251
Playback Level(R-CH)
RV151
Playback Level(L-CH)
– 6 –
set
AF OSC
Attenuator
600
Ω
10 k
Ω
blank tape
CS-123
CS-123
LINE IN
1) 315 Hz
2) 10 kHz
1) 315 Hz
2) 10 kHz
67 mV (–21.3 dB)
Record BIAS Adjustment
Procedure:
1. Mode : record
1. Mode : record
2. Mode: playback
Record Level Adjustment
Procedure:
1. Mode : record
1. Mode : record
2. Mode: playback
+
–
–
set
LINE OUT
47 k
Ω
recorded portion
level meter
3. Confirm playback the signal recorded in step 1 become adjust-
ment level as follows.
4. If these levels do not adjustment level, adjust the RV152 (L-
CH) and RV252 (R-CH) to repeat step 1 and 2.
Adjustment Level:
Playback output of 10 kHz to playback out-
put of 315 Hz: ±0.5 dB.
put of 315 Hz: ±0.5 dB.
Adjustment Location: DECK board
[MAIN BOARD] (Component side)
CN803
IC304
CN802
RV801
Tape Speed
CN801
TEST mode
RV253
Record Level(R-CH)
RV153
Record Level(L-CH)
3. Confirm playback the signal recorded in step 1 become adjust-
ment level as follows.
4. If these levels do not adjustment level, adjust RV153 (L-CH)
and RV253 (R-CH) to repeart step 1 and 2.
Adjustment Level:
–21.3±0.5 dB (63 to 71 mV)
Adjustment Location: MAIN board
+
–
–
set
LINE OUT
47 k
Ω
recorded portion
level meter
set
AF OSC
Attenuator
600
Ω
10 k
Ω
blank tape
CS-123
CS-123
LINE IN
315 Hz, 67 mV (– 21.3 dB)
315 Hz, 67 mV (– 21.3 dB)
SECTION 5
DIAGRAMS
– 7 –
5-1.
IC PIN FUNCTION DESCRIPTION
MAIN BOARD IC101 M38172M4-180FP (SYSTEM CONTROL)
Pin No.
Pin Name
I/O
Function
1
—
—
Not used (Fixed at “L”)
2
—
—
3
KEY-X
I
Key input (A/D convert input) *1
4
KEY-Y
I
5
FWD TAB
I
REC proof detection input from S902 (FWD side)
“H”: Not nail
6
CHROM SW
I
Tape type detection input from S903
“L”: Type I
7
RVS TAB
I
REC proof detection input from S904 (REV side)
“H”: Not nail
8
—
—
Not used (Fixed at “L”)
9
PLAY SW
I
Playback and stop detection input from S907
“L”: Playback
10
TEST MODE
I
Test mode terminal
Normal: “H”
Test mode: “L”
11
POWER OUT
O
Audio and mechanism power on/off output
“L”: Off (Not used)
12
POWER IN
I
Primary power on/off input
“H”: On
13
CLOSE
O
Loading motor (M901) drive output *2
14
OPEN
O
15
—
—
16
—
—
17
—
—
Not used (Fixed at “L”)
18
—
—
19
—
—
20
—
—
21
(CLOCK)
O
Not used (Open)
22
(DATA)
O
Not used (Fixed at “H”)
23
RELAY
O
Relay drive output
“L”: ON
24
BIAS
O
Control output to recording bias switch (Q352)
“L”: ON
25
AU BUS OUT
O
Audio bus output
26
AU BUS IN
I
Audio bus input
27
RESET
I
Reset input
28
X CIN
I
Not used (Fixed at “L”)
29
X COUT
O
Not used (Open)
30
X IN
I
Main system clock input (4 MHz)
31
XOUT
O
Main system clock output (4 MHz)
32
Vss
—
Ground
33
REC MUTE
O
Recording mute on/off control output
“L”: Mute on
34
LINE MUTE
O
Line mute on/off control output
“L”: Mute on
35
—
—
Not used (Fixed at “L”)
36
PB MUTE
O
Playback mute on/off control output
“L”: Mute on
37
REC/PB
O
Mode control output to DOLBY NR amplifier (IC301)
When recording: “H”
38
—
—
Not used (Open)
39
—
—
40
—
—
Not used (Fixed at “L”)
41
POWER
O
Control output to ON/STANDBY LED (D857)
42
TAPE
O
Control output to TAPE LED (D856)
43
CD SYNC
O
Control output to CD SYNC LED (D855)
44
REC
O
Control output to REC LED (D854)
45
PAUSE
O
Control output to PAUSE (
∏) LED (D853)
46
REV
O
Control output to REV (
ª) LED (D852)
– 8 –
Pin No.
Pin Name
I/O
Function
47
FWD
O
Control output to FWD (
·) LED (D851)
48
—
—
49
—
—
50
—
—
51
—
—
52
—
—
53
—
—
54
—
—
55
—
—
56
—
—
Not used (Open)
57
—
—
58
—
—
59
—
—
60
—
—
61
—
—
62
—
—
63
—
—
64
—
—
65
TYPE I
O
Tape type output
“H”: Normal position
66
TYPE II
O
Tape type output
“H”: High position
67
(TYPE IV)
O
68
—
—
Not used (Fixed at “L”)
69
—
—
70
—
—
71
SOLENOIDE
O
Plunger (PM901) drive output
“H”: On
72
CAP.MOTOR
O
Capstan/reel motor (M902) drive output
“H”: On
73
VCC
—
Power supply (+5V)
74
VEE
—
Ground
75
AVSS
—
Ground for A/D converter
76
VREF
—
Reference voltage (+5V) for A/D converter
77
HALF
I
Cassette half detection input from S905
78
AMS IN
I
AMS input
79
LIMIT SW
I
Loading detection input from S901
Open: “L”, Close: “M”, COM: “H”
80
PULSE
I
Rotary detection input from PH901
Voltage
Input port
0 V
0.45 V
1.19 V
2.19 V
3.2 V
3.98 V
4.48 V
5.0 V
Pin 4, KEY-X
Open/Close
STOP
PAUSE
FWD
REV
CD
—
Not key input
§
π
∏
·
ª
SYNC
Pin 3, KEY-Y
POWER
REW
FF
REC
DIRECTION
—
—
DIRECTION
ON/OFF
0
)
r
A
a
*
1 Key Input
*
2 Loading Motor
IN
OUT
CLOSE !£
H
L
OPEN !¢
L
H
Click on the first or last page to see other TC-TX5 service manuals if exist.