CMT-EH12, HCD-EH12 - Sony Audio Service Manual (repair manual). Page 10

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10
HCD-EH12
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.)
3. Do not use a magnetized screwdriver for the adjustments.
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]

Setting:
Function: TUNER
TUNER BAND button: AM
[FM]

Setting:
Function: TUNER
TUNER BAND button: FM
•
Repeat the procedures in each adjustment several times, and
the  tracking adjustments should be finally done by the trimmer
capacitors.
•
Remove FM antenna in FM adjustment.
AM RF signal 
generator
30% amplitude 
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
+
–
level meter
MAIN board
JW148
(GND)
MAIN board
JW403
(TUNER OUT L-ch)
set
MAIN board
CNP802 pin 
2
MAIN board
CNP802 pin 
1
digital voltmeter
JW821 (VT)
JW805 (GND)
10 k
Ω
MAIN board

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