Sony PMC-DR50L / PMC-DR70L Service Manual ▷ View online
– 21 –
Tape Speed Adjustment
Procedure :
– FWD Playback Mode –
1. Set to FWD playback mode.
2. Adjust RV160 so that the frequency counter reading becomes
2. Adjust RV160 so that the frequency counter reading becomes
3,000Hz.
Standard value : 2,970 to 3,030Hz
Standard value : 2,970 to 3,030Hz
3. Set to REV playback mode.
Confirm the frequency should be within the standard value.
4. Confirm the frequency difference between beginning and the
end of tape should be within 1.5% (45Hz).
Adjustment Location : TC RF board
set
test tape
WS-48B
(3kHz, 0dB)
WS-48B
(3kHz, 0dB)
frequency counter
LINE OUT (JK301)
47k
Ω
TUNER SECTION
AM Section
BAND button : MW or LW
Volume : MIN
Volume : MIN
FM Section
BAND button : FM
Volume : MIN
Volume : MIN
•
Repeat the procedures in each adjustment several times, and the
frequency coverage and tracking adjustments should be finally
done by the trimmer capacitors.
frequency coverage and tracking adjustments should be finally
done by the trimmer capacitors.
MW/LW IF ADJUSTMENT
Adjust for a maximum reading on level meter.
T2
450kHz
MW FREQUENCY COVERAGE ADJUSTMENT
Adjust part
Frequency display
reading on digital
voltmeter.
L5
531kHz
Adjustment value :1.4V
Standard value : 1.2 – 1.6V
CT4
1,611kHz
Adjustment value :7.5V
Standard value : 7.1 – 8.0V
MW TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter.
L4
621kHz
TC102
1,404kHz
set
AM RF signal
generator
generator
loop antenna A
loop antenna B
60cm
30% amplitude modulation by 400Hz
signal
Output level : as low as possible
signal
Output level : as low as possible
FM RF signal
generator
generator
22.5kHz frequency deviation by
400Hz signal.
Output level : as low as possible
400Hz signal.
Output level : as low as possible
FM EXT.
ANT.
terminal
ANT.
terminal
0.01
µ
F
set
47k
Ω
+
–
–
LINE OUT (JK301)
level meter
0dB=1
µ
V
TC RF board
RV160 : Tape speed adjustment
Cabinet, front (Rear side)
adjustment screw
FWD side
REV side
4. Change the reverse playback mode and repeat the step 1 to 3.
5. After the adjustment, lock the adjustment screw with suitable
5. After the adjustment, lock the adjustment screw with suitable
locking compound.
Adjustment Location : – record/playback/erase head –
– 22 –
LW FREQUENCY COVERAGE ADJUSTMENT
Adjust part
Frequency display
reading on digital
voltmeter
L10
153kHz
Adjustment value :1.4V
Standard value : 1.2 – 1.6V
CT5
297kHz
Adjustment value :5.5V
Standard value : 5.4 – 5.6V
LW TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter.
L7
162kHz
CT3
261kHz
FM IF ADJUSTMENT
Adjust for a maximum reading on level meter.
T4
10.7MHz
FM FREQUENCY COVERAGE ADJUSTMENT
Adjust part
Frequency display
reading on digital
voltmeter
Confirmation
87.5MHz
1.2 – 1.8V
Confirmation
108MHz
7.7 – 7.9V
Connect and Adjustment Location :
TP1
+
–
MW/LW frequency coverage
FM frequency coverage
FM frequency coverage
Digital voltmeter
100 k
Ω
L7 : LW Tracking Adjustment
CT3 : LW Tracking Adjustment
L4 : MW Tracking Adjustment
CT102 : MW Tracking Adjustment
VT
GND
L10 : LW Frequency coverage Adjustment
CT5 : LW Frequency coverage Adjustment
L5 : MW Frequency coverage Adjustment
CT4 : MW Frequency coverage Adjustment
SR1 : Auto Stop Level Adjustment
T2 : MW/LW IF Adjustment
T4 : FM IF Adjustment
[MAIN BOARD] (Component side)
FM RF signal
generator
generator
22.5kHz frequency deviation by
400Hz signal.
Output level : 30dB
400Hz signal.
Output level : 30dB
µ
FM EXT.
ANT.
terminal
ANT.
terminal
0.01
µ
F
1. Set the frequency of FM SSG to 98MHz.
2. Press the TUNE button of the unit to start the AUTO TUNING.
3. Adjustment the SR1 to stop the auto tuning at 30dBm SSG out-
2. Press the TUNE button of the unit to start the AUTO TUNING.
3. Adjustment the SR1 to stop the auto tuning at 30dBm SSG out-
put.
Auto Stop Level Adjustment
– 23 –
Pin No.
Pin name
I/O
Description
1
G02
O
FL grid drive output.
2
G01
O
FL grid drive output.
3
NC
–
Not used (OPEN).
4
CD SCOR
I
CD SCOR input.
5
T-COUNT
I
Tape rotation detect input.
6
P.DOWN IN (BACK UP)
I
Power ON detect input.
7
TAPE AMS IN
I
AMS signal input.
8
REMOTE IN
I
Remote control signal input.
9
FM STEREO IN
I
FM STEREO signal input.
10
RADIO SHFT CLK
O
Clock shift signal output.
11
LC72131 CE
O
Radio PLL IC chip enable output.
12
LC72131 CLK
O
Radio PLL IC clock output.
13
LC72131 DATA IN
I
Radio PLL IC data input.
14
LC72131 DATA OUT
O
Radio PLL IC data output.
15
CXD2589Q XRST
O
CD system reset output.
16
CXD2589Q XLAT
O
CD DSP IC command latch output.
17
CXD2589Q CLOCK
O
Clock output for CD DSP IC.
18
CXD2589Q DATA
O
CD DSP IC command data output.
19
CD OPEN SW IN
I
CD tray open switch input.
20
CD CLOSE SW IN
I
CD tray close switch input.
21
CXD2589Q SENS1
I
CD SENS input.
22
BU1924F RCLK IN
I
Radio RDS IC clock input.
23
BU1924F RADIO DATA IN
I
Radio RDS IC data input.
24
BU1924F QUARTY IN
I
Radio RDS IC quarity input.
25
CXD2589 SQCK
O
Clock output for CD SUB-Q.
26
CXD2589 SQSO
I
CD SUB-Q input.
27
CXD2589 SENS2
I
CD SENS input.
28
AVREF
I
Reference voltage input (for A/D converter).
29-33
KEY1-5
I
Key return signal input.
34
TAPE STATUS
I
Tape detection input.
35
TAPE MECHA MODE SW
I
FWD/REV detection input.
36
VER
I
Destination setting terminal (fixed at “H”).
37
AVSS
–
Ground.
38
RESET
I
System reset input.
39
EXTAL
O
System clock output (8MHz).
40
XTAL1
I
System clock input (8MHz).
41
VSS
–
Ground.
42
XTAL 32.768kHz
I
Real clock input (32.768kHz).
43
XTAL 32.768kHz
O
Real clock output (32.768kHz).
44
VDD
–
Power supply terminal.
45
VFDP
–
FL power supply terminal.
46
IN I
I
Initial setting input.
47
CD OPEN OUT
O
CD tray open signal output.
48
CD CLOSE OUT
O
CD tray close signal output.
49
P03
–
Not used (OPEN).
50
P04
–
Not used (OPEN).
SECTION 5
DIAGRAMS
5-1. EXPLANATION OF IC TERMINALS
IC801 CXP82832-023Q (SYSTEM CONTROL, FL DRIVE)
– 24 –
Pin No.
Pin name
I/O
Description
51
SYS MUTE
O
Mute signal output.
52
TUNER MUTE
O
Tuner mute signal output.
53
CD MUTE
O
CD mute signal output.
54
LINE MUTE
O
Line mute signal output.
55
TAPE REC MUTE
O
Tape mute signal output.
56
TAPE REC
O
Tape REC output.
57
TAPE BIAS
O
Tape REC bias select output.
58
TAPE SOL
O
Plunger control output.
59
TAPE MECHA VCC OUT
O
Tape mechanism B+ ON/OFF output.
60
ISS 1
O
ISS 1 ON/OFF output.
61
ISS 2
O
ISS 2 ON/OFF output.
62
MEGA BASS
O
Mega bass ON/OFF output.
63
POWER CONT OUT
O
Power ON/OFF output.
64
SUMMER LED
–
Not used. (OPEN)
65
SOUND LED
O
SOUND LED ON/OFF output.
66
RDS LED
O
RDS LED ON/OFF output.
67
BH3854 CK
O
Clock output for electrical volume IC.
68
BH3854 DATA
O
Data output for electrical volume IC.
69
BH3854 LACH
O
LACH output for electrical volume IC.
70
RESERVE
–
Not used (OPEN).
71-88
SEG 1-18
O
FL segment drive output.
89
VDD
–
Power supply terminal.
90-100
G03-13
O
FL grid drive output.
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