Sony TC-TX5 User manual

MICROFILM
TC-TX5
STEREO CASSETTE DECK
AEP Model
UK Model
E Model
Tourist Model
SERVICE MANUAL
Dolby noise reduction manufactured under
license from Dolby Laboratories Licensing
Corporation.
“DOLBY” and the double-D symbol aare
trademarks of Dolby Laboratories Licensing
Corporation.
Model Name Using Similar Mechanism TC-S1
Tape Transport Mechanism Type TCM-9700HLD
SPECIFICATIONS
Recording system 4-track 2-channel stereo
Frequency response (DOLBY NR OFF)
30 – 14,000 Hz (±3 dB), using
Sony TYPE I cassette
30 – 15,000 Hz (±3 dB), using
Sony TYPE II cassette
Wow and flutter ±0.15% W. Peak (IEC)
0.1% W. RMS (NAB)
±0.2% W. Peak (DIN)
Input TAPE IN (phono jacks):
impedance 47 kilohms
Output TAPE OUT (phono jacks):
voltage 550 mV
impedance 47 kilohms
General
Power requirements AEP, UK, Germany:
220 – 230V AC, 50/60 Hz
Other countries:
110 – 120V or 220 – 240 VAC,
50/60Hz Adjustable with the
voltage selector
Power consumption 10 W
Dimensions Approx. 280 ×85 ×360 mm
(111/8×33/8×141/4in) (w/h/d)
incl. projecting parts and controls
Mass Approx. 3.7 kg (8 lb 3 oz)
Supplied accessories: Audio connecting cord (2)
AU BUS connecting cord (1)
Design and specifications are subject to change without
notice.

– 3 –
SECTION 2
DISASSEMBLY
Note: Follow the disassembly procedure in the numerical order given.
CASE FRONT PANEL SECTION
LOADING PANEL MECHANISM DECK
2 Remove the loading panel
to direction of the arrow B .
B
1 Rotate the gear
to direction of
the arrow A .
1 two screws
(BVTT2.6 × 8)
3 two screws
(BV3 × 8)
2 bracket
7 mechanism deck
5 connector
(CN804)
4 four
screws
(BV3 × 8)
6 two
claws
5 two
connectors
(CN351, 803)
1 two screws
(CASE 3 TP2)
2 case
1 two screws
(CASE 3 TP2)
1 screw
(BV3 × 8)
2 flat wire
(CN802)
3 front panel section
1 screw
(BV3 × 8)
1 three screws
(BV3 × 8)
A

– 4 –
PRECAUTION
1. Clean the following parts with a denatured-alcohol-moistened
swab:record/playback/earth head pinch roller
rubber belts capstan
idlers
2. Demagnetize the record/playback head with a head demagne-
tizer. (Do not bring the head demagnetizer close to the erase
head.)
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 rated power sup-
ply voltage unless otherwise noted.
Torque Measurement
SECTION 3
MECHANICAL ADJUSTMENTS
Mode Torque Meter Meter Reading
CQ-102C
30-65 g•cm
FWD (0.42-0.90 oz•inch)
FWD 1.5-6 g•cm
Back tension (0.021-0.083 oz•inch)
CQ-102RC
30-65 g•cm
REV (0.42-0.90 oz•inch)
REV 1.5-6 g•cm
Back tension (0.021-0.083 oz•inch)
70-130 g•cm
FF, REW CQ-201B (0.98-1.80 oz•inch)
SECTION 4
ELECTRICAL ADJUSTMENTS
Note: The adjustment should be performed in the order given in
the service manual. As a rule, adjustments about playback
should be performed before those about recording.
The adjustments should be performed before for both L-CH
and R-CH.
• Switches and controls should be set as follows unless otherwise
specified.
DOLBY NR switch : OFF
DIRECTION switch : A
0 dB=0.775 V
TestTape
Type Signal Used for
P-4-A100 10 kHz, –10 dB Azimuth Adjustment
P-4-L300 315 Hz, 0 dB Playback Level Adjustment
WS-48B 3 kHz, 0 dB Tape Speed Check
Test Mode
This set will get into test mode by shorting the pins of CN801 (2P)
on MAIN board before turning the power on.

– 5 –
Record/Playback Head Azimuth Adjustment
Procedure:
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.
Screw
position
L-CH
peak
within
1dB
output
level
L-CH peak R-CH peak
within
1dB
angl
e
R-CH
peak
3. Phase Check
Mode : playback
+
–
VH
+
–
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)
+
–
set
47 k
Ω
LINE OUT
level mete
r
Test tape
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.
Adjustment Location: Record/Playback head
              
FWD side REV side
Adjustment screw
Tape Speed Adjustment
Procedure:
Mode: FWD playback
+
–
set
LINE OUT
frequency counte
r
test tape
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
2,980 ± 30 Hz.
3. Confirm that the deviation between tape top and tape end is within
3%.
Playback Level Adjustment
Procedure:
Mode: FWD playback
Adjust RV151 (L-CH) and RV251 (R-CH) so that the reading on
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
Check that the LINE OUT level does not change even if Playback
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) level mete
r
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
LINE IN
1) 315 Hz
2) 10 kHz 67 mV (–21.3 dB)
Record BIAS Adjustment
Procedure:
1. Mode : record
2. Mode: playback
Record Level Adjustment
Procedure:
1. Mode : record
2. Mode: playback
+
–
set
LINE OUT
47 k
Ω
recorded portion level mete
r
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.
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 mete
r
set
AF OSC
Attenuator
600
Ω
10 k Ω
blank tape
CS-123
LINE IN
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∏·ªSYNC
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 !£ HL
OPEN !¢ LH