Adjustment - Sharp CD-DD4500 Service Manual

MECHANISM SECTION
• Driving Force Check
Torque Meter
Play: TW-2111
• Torque Check
Torque Meter
Play: TW-2111 30 to 80 g.cm
Fast forward: TW-2231 —
Rewind: TW-2231 —
• Tape Speed
Test Tape Adjusting
Point
Normal MTT-111 Variable
speed Resistor in
motor.
TAPE MECHANISM
Variable Resistor in motor
Figure 17-1
TUNER SECTION
fL: Low-range frequency
fH: High-range frequency
• AM adjustment and confirmation
AM signal oscillator Frequency 400 Hz, 30 %, AM modulation
Adjusting item Adjusting object
IF Adjust the indication of Set IF wafeform
T351 set to 1,720 kHz. 450 kHz to maximum.
Frequency cover fL: T306 (530 kHz)
(VT line voltage of Adjust the indication
TP301) of set to 530 kHz.
fH: (1,720 kHz)
Tracking fL: T302 (990 kHz)

ADJUSTMENT

Specified Value
Tape 1: Over 80 g
Tape 2: Over 80 g
Specified Value
Tape 1 Tape 2
30 to 80 g.cm
70 to 180 g.cm
70 to 180 g.cm
Specified Instrument
Value Connection
3,000 ± 30 Hz
Speaker
Terminal
(Load
resistance:
6 ohms)
Tape
Motor
Adjusting
method
fL: 1.3 ± 0.1 V
fH: 8.5 ± 1.3 V
(Only confirmation)
Set the output of
speaker terminal
to maximum.
• FM mute level adjustment
FM signal oscillator Frequency 1 kHz, 22.5 kHz
Frequency Adjusting
method
98.0 MHz 26 dB(EMF)
FM signal oscillator
Figure 17-2 FM Mute Level
• Erasing the registered broadcast station
When the power is off, press and hold the TUNER (BAND)
button and the X-BASS button, and then press the POWER
button.
All the registered stations are erased.
• Setting the Test Mode
While holding down the MEMORY/SET button and the X-
BASS button, press the POWER button. Frequencies are
rewritten in memory as shown in table 17. Call them using the
VOLUMN knob of tuner circuit adjustment and check.
Note that once you reinitialize the settings, the frequencies
recorded by users will be changed.
Preset No. Frequency
P01 87.5 MHz
P02 108.0 MHz
P03 90.0 MHz
P04 106.0 MHz
P05 98.0 MHz
AM Loop Antenna
AM signal oscillator
Loop Antenna
– 17 –
CD-DD4500
Adjusting
Adjusting object
object
VR351 Input: CNP301
Output: Speaker
Speaker
CNP301
Terminal
UNIT
Preset No.
P06
P07
P08
P09
P10
Table 17
IF : Speaker Terminal
Frequency cover: TP301
UNIT
GND
Figure 17-3 AM IF
Terminal
Electronic
Voltmeter
Frequency
530 kHz
1,720 kHz
600 kHz
1,400 kHz
990 kHz
Electronic
Voltmeter