Read Sony CMT-EH25 / CMT-EH26 / HCD-EH25 / HCD-EH26 Service Manual online
HCD-EH25/EH26
10
Adjustment Location: Record/Playback/Erase Head
Note: Remove the cassette lid before this adjustment.
Refer to “DISASSEMBLY” (page 5)
[AM]
Setting:
Function: TUNER
Band: AM
Setting:
Function: TUNER
Band: AM
[FM]
Setting:
Function: TUNER
Band: FM
Setting:
Function: TUNER
Band: FM
TUNER SECTION
0 dB = 1
μV
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
MAIN board
CNP802 pin
digital voltmeter
JW821 (VT)
JW805 (GND)
10 k
Ω
MAIN board
• Repeat the procedures in each adjustment several times, and
the tracking adjustments should be fi nally done by the trimmer
capacitors.
capacitors.
• Remove FM antenna in FM adjustment.
( ): AEP, Russian and UK models
AM VT VOLTAGE ADJUSTMENT
Adjustment Part Frequency Display Reading on Digital Voltmeter
L852
530 (531) kHz
1.5 ± 0.1 V
Confi rmation
1,710 (1,602) kHz
8.0 (7.2) ± 0.5 V
( ): AEP, Russian and 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
Confi rmation
108 MHz
6.2 ± 0.5 V
FM TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter
L804
98 MHz
FM DETECTOR ADJUSTMENT
Setting:
Function: TUNER
BAND button: FM
Setting:
Function: TUNER
BAND button: FM
1. Tune the set to 98 MHz.
2. Adjust L806 so that modulation distortion may become the
2. Adjust L806 so that modulation distortion may become the
best in the vicinity of the maximum value where the tuner out
level becomes –15 dBs or more.
level becomes –15 dBs or more.
set
MAIN board
JW403
(TUNER OUT L-ch)
JW403
(TUNER OUT L-ch)
MAIN board
JW148 (GND)
JW148 (GND)
Carrier frequency : 98 MHz
Modulation
Modulation
: deviation by
FM 75 kHZ
Output level
: 60 dB
FM RF Signal
generator
generator
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