Read Sony CMT-EH10 / HCD-EH10 Service Manual online
10
HCD-EH10
SECTION 5
MECHANICAL ADJUSTMENTS
SECTION 6
ELECTRICAL ADJUSTMENTS
•
Precaution
1. Clean the following parts with a denatured-alcohol-moistened
swab :
record/playback head
pinch roller
erase head
rubber belts
capstan
idlers
2. Demagnetize the record/playback head with a head
demagnetizer. (Do not bring the head magnetizer close to the
erase head.)
erase head.)
3. Do not use a magnetized screwdriver for the adjustments.
4. After the adjustments, appiy suitable locking compound to
4. After the adjustments, appiy suitable locking compound to
the parts adjusted.
5. The adjustments should be performed with the rated power
supply voltage unless otherwise noted.
•
Torque Measurement
Mode
Torque Meter
Meter Reading
2.0 – 8.0 mN
⋅
m
FWD
CQ-102AS
(20 – 80 g
⋅
cm)
(0.28 – 1.12 oz
⋅
inch)
FWD
0.15 – 0.6 mN
⋅
m
Back Tension
CQ-102C
(1.5 – 6.0 g
⋅
cm)
(0.021 – 0.083 oz
⋅
inch)
5.0 – 17.7 mN
⋅
m
FF
CQ-201AS
(50 – 177 g
⋅
cm)
(0.7 – 2.48 oz
⋅
inch)
5.0 – 17.7 mN
⋅
m
REW
CQ-201B
(50 – 177 g
⋅
cm)
(0.7 – 2.48 oz
⋅
inch)
•
Tape Tension Measurement
Mode
Tension Meter
Meter Reading
FWD
CQ-403A
more than 80 g
(more than 2.82 oz)
TUNER SECTION
0 dB=1
µ
V
[AM (MW/LW)]
Setting:
Function : TUNER
BAND button : AM
Function : TUNER
BAND button : AM
[FM]
Setting:
Function : RADIO
RADIO BAND button: FM
Function : RADIO
RADIO BAND button: FM
•
Repeat the procedures in each adjustment several times, and
the tracking adjustments should be finally done by the trimmer
capacitors.
capacitors.
•
Remove FM antenna in FM adjustment.
(
): AEP, East European, Russian, UK models
AM VT VOLTAGE ADJUSTMENT
Adjustment Part
Frequency Display
Reading on Digital Voltmeter
L852
530 (531) kHz
1.5
±
0.1 V
Confirmation
1710 (1602) kHz
8.0 (7.2)
±
0.5 V
(
): AEP, East European, Russian, UK models
AM TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter
L851
530 (531) kHz
FM VT VOLTAGE ADJUSTMENT
Adjustment Part
Frequency Display
Reading on Digital Voltmeter
L805
87.5 MHz
1.75
±
0.1 V
Confirmation
108 MHz
6.2
±
0.5 V
AM RF signal
generator
generator
30% amplitude
modulation by
400 Hz signal
modulation by
400 Hz signal
60 cm
set
loop antenna A
loop antenna B
FM RF signal
generator
1 kHz frequency
deviation by FM 75 kHz
signal
Output level:
as low as possible
deviation by FM 75 kHz
signal
Output level:
as low as possible
+
–
–
level meter
MAIN board
JW148
(GND)
JW148
(GND)
MAIN board
JW403
(TUNER OUT L-ch)
JW403
(TUNER OUT L-ch)
set
MAIN board
CNP802 pin
CNP802 pin
2
MAIN board
CNP802 pin
CNP802 pin
1
digital voltmeter
JW821 (VT)
JW805 (GND)
10 k
Ω
MAIN board
Ver. 1.1
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