Sony CMT-SP55TC / TC-SP55 Service Manual ▷ View online
13
Record Level Adjustment
Procedure:
1. Record mode.
1. Record mode.
2. Playback mode.
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 RV401 (L-CH)
and RV451 (R-CH), on the MAIN board to repeat steps 1 to 3.
Adjustment level:
LINE OUT level: –21.8 dB ± 0.5 dB (59.5 to 66.7 mV)
Adjustment level:
LINE OUT level: –21.8 dB ± 0.5 dB (59.5 to 66.7 mV)
Adjustment Location: MAIN board
AF OSC
AUX IN (on ST-SP55)
315Hz 50 mV (–23.8 dB)
315Hz 50 mV (–23.8 dB)
blank tape
CS-123
CS-123
set
attenuator
600
Ω
recorded
position
set
AUX OUT
(on ST-SP55)
(on ST-SP55)
level meter
RV311 (L-CH),
RV361 (R-CH)
RECORD BIAS
RV361 (R-CH)
RECORD BIAS
RV211 (L-CH),
RV261 (R-CH)
PB LEVEL
RV261 (R-CH)
PB LEVEL
RV401 (L-CH),
RV451 (R-CH)
REC LEVEL
RV451 (R-CH)
REC LEVEL
TAPE SPEED
RV362
RV311
RV361
RV211
RV261
RV451 RV401
14
SECTION 7
DIAGRAMS
THIS NOTE IS COMMON FOR PRINTED WIRING
BOARDS AND SCHEMATIC DIAGRAMS.
(In addition to this, the necessary note is printed
in each block.)
BOARDS AND SCHEMATIC DIAGRAMS.
(In addition to this, the necessary note is printed
in each block.)
For schematic diagrams.
Note:
• All capacitors are in µF unless otherwise noted. pF: µµF
• All capacitors are in µF unless otherwise noted. pF: µµF
50 WV or less are not indicated except for electrolytics
and tantalums.
and tantalums.
• All resistors are in
Ω
and
1
/
4
W or less unless otherwise
specified.
•
f
: internal component.
•
2
: nonflammable resistor.
•
5
: fusible resistor.
•
C
: panel designation.
For printed wiring boards.
Note:
• X
: parts extracted from the component side.
• Y
: parts extracted from the conductor side.
• b
: Pattern from the side which enables seeing.
(The other layers' patterns are not indicated.)
•
U
: B+ Line.
•
V
: B– Line.
•
H
: adjustment for repair.
• Voltages and waveforms are dc with respect to ground
under no-signal (detuned) conditions.
• Voltages are taken with a VOM (Input impedance 10 M
Ω
).
Voltage variations may be noted due to normal produc-
tion tolerances.
tion tolerances.
• Waveforms are taken with a oscilloscope.
Voltage variations may be noted due to normal produc-
tion tolerances.
tion tolerances.
• Circled numbers refer to waveforms.
• Signal path.
• Signal path.
E
: PB
a
: REC
• Abbreviation
AED
: North European model
MY
: Malaysia model
SP
: Singapore model
Note: The components identified by mark
0
or dotted line
with mark
0
are critical for safety.
Replace only with part number specified.
• Indication of transistor
C
B
These are omitted.
E
Q
B
These are omitted.
C
E
B
These are omitted.
C
E
• WAVEFORMS
– MAIN BOARD –
250Vp-p
2
T501
4
REC MODE
3
T501
5
REC MODE
65Vp-p
125nsec
1
IC701
w;
XOUT
4.5Vp-p
11.7
µ
sec
11.7
µ
sec
15
15
TC-SP55
7-1. BLOCK DIAGRAM
: PB
: REC
: REC
•
Signal Path
•
R-ch is omitted due to same as L-ch.
DOLBY
TYPE B
Q502,503
BIAS
OSC
IC201
ERASE BIAS
L
R
RV211
REC/PB HEAD
TAPE MECHANISM ASSY
CMAL2Z720A
R CH
3
1
IC101
REC/PB
EQ OUT
T501
REC BIAS
46
48
16
21
50
PB-A/B
EQ IN
38
36
RV401
REC LEVEL
39
REC OUT
BIAS SW
70
120
+7V
-7V
Q501
LIN
43
PB
18
20
22
40
25
PB OUT
LM ON/
OFF
BIAS ON/OFF
RM ON/OFF
ALC ON/OFF
B NORM/CROM/
METAL
NORM/
HIGH
PAS
DOL
P
R
X
DOLBY NR
RV311
REC
BIAS
PLAYBACK
LEVEL
33
23
24
NR ON/
OFF
VCC
VEE
28 27
26
MS
19
27
17
29
37
36
35
34
41 42
24
25
26
23
22
8
32
7
30
16
31
33
14
13
6
HRPE101
ERASE HEAD
22
3
1
6
8
5
7
13
18
14
12
11
19
17
3
1
+5V
REG.
+12
REG.
3
1
SYSTEM
CONTROL
3
(FROM ST-SP55)
+UNREG(H)
+UNREG(L)
-UNREG(-)
DGND
MGND
I2C CLK
PDOWN
IC603
IC602
IC604
IC605
I2C-DATA
AGND
TC-R
REC-L
REC-R
TC-L
AGND
AGND
DGND
MGND
-7V
REG
16
-7V
+5V
15
3
1
RESET.
D+5.6V
+12V
+7V
REG.
3
1
3
2
+7V
1
18
D603
IC702
l m
M L
s
H
A
h
z
REC
S
H
h
z
REC
S
Q701-705
LED DRIVE
D911
D912
CD SYNC REC
D913
D914
D915
DOLBY NR
DIRECTION
CD SYNC
REC
S911
S910
S909
S908
S907
S906
S905
S904 S903
S902
S901
4
39
38
28
33
40
CAPSTAN
MOTOR
M
LOADING
MOTOR
M
10
6
2
5
IC601
MOTOR DRIVE
RV362
TAPE
SPEED
Q603,604
SOL
DRIVE
SOLENOID
+12V
Q601,602
MOTOR
DRIVE
+12V
CRO2
PACK
FREC
+MTR
PREC
PLAY
R-CH
R-CH
D623
D624
D622
D621
AMS IN
TC-MUTE
DOLBY
PASS/PB/REC
BIAS
REC MUTE
ALC
DOLBY
BIAS
REC.M
ALC
REC.PB.P
TC.M
AMS
I2C-DATA
I2C-CLK
DOWN
VCC
RESET
KEY1
KEY0
PAUSE LED
FWD LED
REV LED
REC LED
SYNC REC
LED
TC-RELAY
+MTR
+SOL
PACK
SENSOR OUT
B-HALF
PLAY SW
LOAD OUT
LOAD IN
LOAD OUT SW
LOAD IN SW
OUT SW
IN SW
OUT 2
OUT 1
IN 2
IN1
IC401
DDOLBY NR
AMS
DOLBY
TC.M
REC.PB.P
BIAS
REC.M
ALC
+7V
-7V
09
IC701
SYSTEM
CONTROL
CN701
16
16
TC-SP55
7-2. SCHEMATIC DIAGRAM – MAIN SECTION – • See page 14 for Waveforms. • See page 19 for IC Pin Functions. • See page 20 for IC Block Diagrams.
PIN
FUNCTION
FUNCTION
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