Sharp WF-2100BK, Service Manual

WF-2100W

– 6 –

FM IF

T108

Input: FM Antenna

FM Detection T106

Output: Pin 9 of IC102

FM Band

fL: L101

Input: Antenna

Coverage

fH: TC1

Output: Headphones
Socket

FM Tracking

fL (88.0 MHz): L102

(Load resistance: 32 ohms)

fH (108 MHz): TC2

ADJUSTMENT

Specified Value

MECHANISM SECTION

• Driving Force Check

Specified Value

• Torque Check

• Head Azimuth

MTT-114

Headphones Socket
(Load resistance: 32 ohms)

Instrument Connection

• Tape Speed (Normal only)

Instrument

Connection

MTT-111

Tape 1, Tape 2:

3,000 

±

 60 Hz Headphones

VR501

Socket
(Load resistance:
32 ohms)

Torque Meter

Torque Meter

Test Tape

Test Tape

• Playback Amplifier Sensitivity Check

Play: TW-2412

Tape 1: Over 60 g
Tape 2: Over 50 g

Tape 1

Tape 2

Adjustment

Point

Specified

Value

Specified value

Instrument Connection

MTT-118

2.5 V 

±

 3 dB

Speaker terminal
(Load resistance: 8 ohms)

Test tape

Figure 6 VCO FREQUENCY TEST CIRCUIT

TUNER SECTION

fL: Low-range frequency
fH: High-range frequency

Specified value

Instrument Connection

VR102

76 kHz 

±

 200 Hz

Pin 13, Pin 21 and ground

of IC102

Adjustment

Point

• VCO Frequency

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.

Specified Value/

Adjusting Point

Test Stage

Instrument

Connection

Test Stage

Specified Value/

Adjusting Point

Instrument

Connection

AM IF

T107

Input: Antenna
Output: Pin 9 of IC102

MW Band

fL: T103

Input: Antenna

Coverage

fH: TC3

Output: Headphones
Socket

MW Tracking fL (600 kHz): L103

(Load resistance 32 ohms)

fH (1,400 kHz): TC4

SW1 Band

fL (2.3 MHz): T104

Coverage

fH (7.3 MHz): CT102

SW1

fL (2.6 MHz): T101

Tracking

fH (6 MHz): CT104

SW2 Band

fL (7.3 MHz): T105

Coverage

fH (22 MHz): CT101

SW2

fL (8.5 MHz): T102

Tracking

fH (19 MHz): CT103

10 pF

1 Mohm

10 kohm

TO FREQUENCY
      COUNTER

Pin 13 of IC102

Pin 21 of IC102

FET: 2SK212
      (or Other 2SK Type FET.)

G

D

S

0.1 

µ

F

Specified Value

Beat Cancel

A: 100 

±

 4 kHz

B:   94 

±

 4 kHz

C: 104 

±

 4 kHz

T201

100 kHz + 4 kHz

Pin 5 of CON202

Adjustment Point

Specified value

Instrument

Connection

DECK SECTION

• Bias Oscillation

• FM IF/RF

Play: TW-2111

30 to 70 g.cm

27 to 60 g.cm

Fast Forward: TW-2231

Over 55 g.cm

55 to 120 g.cm

Rewind: TW-2231

Over 55 g.cm

55 to 120 g.cm

• AM IF/RF

• Beat Cancel Switch: A