Adjustment - Sharp WF-2000W Service Manual

WF-2000W
MECHANISM SECTION
• Driving Force Check
Torque Meter
Play: TW-2412
• Torque Check
Torque Meter
Play: TW-2111
Fast Forward: TW-2231
Rewind: TW-2231
• Head Azimuth
Test Tape
MTT-114
• Tape Speed (Normal only)
Test Tape

Adjustment

Tape 1, Tape 2: 3,000 ± 60 Hz Headphones
MTT-111
VR501
DECK SECTION
• Bias Oscillation
Adjustment Point
T201
• Beat Cancel Switch: A
Beat Cancel
• Playback Amplifier Sensitivity Check
Test tape
2.5 V ± 3 dB
MTT-118
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Specified Value
Tape 1: Over 60 g
Tape 2: Over 50 g
Specified Value
Tape 1
30 to 70 g.cm 27 to 60 g.cm
Over 55 g.cm 55 to 120 g.cm
Over 55 g.cm 55 to 120 g.cm
Instrument Connection
Headphones Socket
(Load resistance: 32 ohms)
Specified Instrument
Point Value Connection
Socket
(Load resistance:
32 ohms)
Specified value Instrument
Connection
100 kHz + 4 kHz Pin 5 of CON202
Specified Value
A: 100 ± 4 kHz
B: 94 ± 4 kHz
C: 104 ± 4 kHz
Specified value Instrument Connection
Speaker Terminal
(Load resistance: 8 ohms)
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ADJUSTMENT
TUNER SECTION
fL: Low-range frequency
fH: High-range frequency
• FM IF/RF
Test Stage
FM IF
FM Detection T106
Tape 2
FM Band
Coverage
FM Tracking fL (88.0 MHz): L102
• AM IF/RF
Test Stage
AM IF
MW Band
Coverage
MW Tracking fL (600 kHz): L103
SW1 Band
Coverage
SW1
Tracking
SW2 Band
Coverage
SW2
Tracking
• VCO Frequency
Adjustment
Point
VR102
Note:
After preparing the test circuit shown in Fig. 6, connect the Pin
13, Pin 21 and ground of the IC102 with the test circuit, and
measure the value.
Pin 13 of IC102
10 pF
1 Mohm
Figure 6 VCO FREQUENCY TEST CIRCUIT
– 6 –
Specified Value/ Instrument
Connection
Adjusting Point
T108 Input: FM Antenna
Output: Pin 9 of IC102
fL: L101 Input: Antenna
fH: TC1 Output: Headphones
Socket
(Load resistance: 32 ohms)
fH (108 MHz): TC2
Specified Value/ Instrument
Adjusting Point Connection
T107 Input: Antenna
Output: Pin 9 of IC102
fL: T103 Input: Antenna
fH: TC3 Output: Headphones
Socket
(Load resistance 32 ohms)
fH (1,400 kHz): TC4
fL (2.3 MHz): T104
fH (7.3 MHz): CT102
fL (2.6 MHz): T101
fH (6 MHz): CT104
fL (7.3 MHz): T105
fH (22 MHz): CT101
fL (8.5 MHz): T102
fH (19 MHz): CT103
Specified value Instrument Connection
76 kHz ± 200 Hz
Pin 13, Pin 21 and ground
of IC102
Pin 21 of IC102
D
FET: 2SK212
G
(or Other 2SK Type FET.)
S
TO FREQUENCY
0.1 µF
10 kohm
COUNTER