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ZS-D5
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SECTION 6
ELECTRICAL ADJUSTMENT
0 dB = 0.775V
TAPE RECODER SECTION
PRECAUTION
1. Perform adjustments in the test mode.
2. Demagnetize the record/playback head with a head
2. Demagnetize the record/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
4. After the adjustments, apply suitable locking compound to the
parts adjust.
5. The adjustments should be performed with the rated power
supply voltage unless otherwise noted.
6. The adjustments should be performed in the order given in this
service manual. (As a general rule, playback circuit adjustment
should be completed before performing recording circuit
adjustment.)
should be completed before performing recording circuit
adjustment.)
7. The adjustments should be performed for both L-CH and R-
CH.
•
Standard Record:
Deliver the standard input signal level to the input jack and set the
VOLUME +/– keys to obtain the standard input and output signal
level.
VOLUME +/– keys to obtain the standard input and output signal
level.
•
Standard input level
•
Standard output level
•
Test tape
Record/Playback Head Azimuth Adjustment
Note:
• Start adjustment after head has changed the direction.
(When head is positioned in the FWD direction of tape
running, start adjustment with REV .)
running, start adjustment with REV .)
• The adjustment must be ended with cw turning of
adjustment screw.
Procedure:
1.
1.
Mode : REV playback
LINE IN
10 k
Ω
0.25 V (–9.8 dB)
Input Pin
Signal source impedance
Input signal level
Test Tape
P-4-A100
WS-48A
Used for
REC/PB/ERASE Head azimuth
and phase adjustment.
and phase adjustment.
Tape speed adjustment
Signal
10 kHz, -10 dB
3 kHz, 0 dB
Output Pin
Load impedance
Output signal level
SP OUT (L, R)
H.P OUT
3.2
32
0.775 V (0 dB)
0.10 V (-18 dB)
Tape Speed Adjustment
Procedure:
Mode :
FWD playback
1.
Playback the standard tape in FWD mode.
2.
Adjust the variable resistor of the motor (M691) until frequency
counter reading is from 2,985 to 3,015 Hz.
counter reading is from 2,985 to 3,015 Hz.
3.
Confirm that the freqency difference between the tape top and
end is within 3 %.
end is within 3 %.
set
+
–
–
level meter
test tape
P-4-A100
(10KHz, –10dB)
P-4-A100
(10KHz, –10dB)
LINE OUT
47
k
k
Ω
Screw
position
position
L-CH
peak
peak
within
1dB
1dB
output
level
level
L-CH
peak
peak
R-CH
peak
peak
within
1dB
1dB
Screw
position
position
R-CH
peak
peak
2. Turn the adjustment screw and check output peaks. If the peaks
do not match for L-CH and R-CH, turn the adjustment screw
so that outputs match within 1dB of peak.
so that outputs match within 1dB of peak.
3. Phase Check
Mode: REV playback
Note:
Adjustment must be completed by cw turning of adjustment
screw.
After the adjustment, lock the screws with locking
compound.
screw.
After the adjustment, lock the screws with locking
compound.
4. Repeat steps 1 to 3 FWD playback mode.
5. Check that phase difference between L-CH and R-CH is from o
5. Check that phase difference between L-CH and R-CH is from o
to 90 degrees.
6. After the adjustments, apply suitable locking compound to the
pats adjusted.
Adjustment Location:
LINE OUT
test tape
WS-48B
(3 kHz, 0 dB)
WS-48B
(3 kHz, 0 dB)
set
frequency counter
+
–
100 k
Ω
Oscilloscope Lissajous pattern
in phase
good
wrong
45
°
135
°
90
°
180
°
test tape P-4-A100
(100 kHz, –10 dB)
(100 kHz, –10 dB)
L-CH
R-CH
47 k
Ω
LINE
47 k
Ω
oscilloscope
set
V
H
Adjustment screw
(FWD)
(FWD)
Adjustment screw
(REV)
(REV)
0 dB = 1
µ
V
TUNER SECTION
[Setting during adjustment]
Function mode: RADIO
VOLUME: Maximum
Function mode: RADIO
VOLUME: Maximum
• AM Section
• FM section
AM RF SSG
Put the lead-wire antenna
close to the set.
close to the set.
30% amplitude
modulation by
400 Hz signal
modulation by
400 Hz signal
Output level: as low as possible
to FM RF (FM IN)
FM RF SSG
22.5 kHz frequency
deviation by 400 Hz
signal
deviation by 400 Hz
signal
Output level: as low as possible
set
32
Ω
VTVM
HEADPHONES
+
–
•
Repeat the proceduresin each adjustment several times for the
maximum level meter indication.
maximum level meter indication.
•
The frequency coverage and tracking adjustments should be
finally done by the trimmer capacitors.
finally done by the trimmer capacitors.
AEP/Italian/UK/E model
LW RECEPTION FREQUENCY COVERAGE CHECK
Frequency indication
151 kHz
273 kHz
Digital voltmeter reading
0.6 to 0.7 V
4.7 to 5.7 V
Adjustment
CT3
check
( ) : US/Canadian model
MW/AM TRACKING ADJUSTMENT
Adjust for a maximum defection of level meter.
L3
CT2
621 kHz (620 kHz)
1,404 kHz (1,400 kHz)
( ) : US/Canadian model
MW/AM RECEPTION FREQUENCY COVERAGE CHECK
Frequency indication
531 kHz
1,611 kHz
(530 kHz)
(1,710 kHZ)
Digital voltmeter reading
0.6 to 1.2 V
4.5 to 5.5 V
(0.9 to 1.0 V)
(5.2 to 6.2 V)
Adjustment
L4
check
AEP/Italian/UK/E model
LW TRACKING ADJUSTMENT
Adjust for a maximum defection of level meter.
L3
CT5
162 kHz
261kHz
FM RECEPTION FREQUENCY COVERAGE CHECK
Frequency indication
87.5 MHz
108 MHz
Digital voltmeter reading
0.9 to 1.3 V
3.4 to 4.4 V
Adjustment
L2
check
FM TRACKING ADJUSTMENT
Adjust for a maximum defection of level meter.
L1
CT1
87.5 MHz
108 MHz
Adjustment Location:
TUNER board (Side A)
[US/CND Model]
IC701
JW126
JW135
L3
CT2
AM Tracking
L2: FM Reception
Frequency coverage
Frequency coverage
CT1
L1
FM
Tracking
Tracking
L4: AM Reception
Frequency coverage
Frequency coverage
Measurement Point:
MAIN board (Side B)
[AEP/IT/UK/E model]
L3 (LW)
CT5
CT4 L3 (MW)
LW Tracking
MW Tracking
L4
CT2
L2: FM Reception
Frequency Coverage
Frequency Coverage
CT1
L1
FM
Tracking
Tracking
CT3: LW Reception
Frequency
Coverage
Frequency
Coverage
MW Reception
Frequency Coverage
Frequency Coverage
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