Sharp GX-CD1200W GL Service Manual download pdf (Page 7)

GX-CD1200W

– 7 –

ADJUSTMENT

Specified Value

MECHANISM SECTION

• Driving Force Check

Specified Value

• Torque Check

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

• Head Azimuth

MTT-114 Headphones Socket

(Load resistance: 32 ohms)

Instrument Connection

• Tape Speed (Normal only)

Instrument

Connection

MTT-111 Tape 1,2:VR102 3,000 ± 60 Hz Headphones

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 7 VCO FREQUENCY TEST CIRCUIT

TUNER SECTION

fL: Low-range frequency

fH: High-range frequency

Specified value Instrument Connection

VR1 76 kHz ± 200 Hz Pin 13, Pin 21 and ground

of IC2

Adjustment

Point

• VCO Frequency

Note:

After preparing the test circuit shown in Fig. 7, connect the Pin

13, Pin 21 and ground of the IC2 with the test circuit, and

measure the value.

• FM IF/RF

Specified Value/

Adjusting

Point

Test Stage

FM IF L9 Input: FM Antenna

FM Detection L10 Output:Pin 9 of IC2

FM Band fL: L1 Input: Antenna

Coverage fH: TC1 Output: Headphone Socket

FM Tracking fL(88.0 MHz): L2 (Load resistance:

fH(108 MHz): TC2 32 ohms)

Instrument

Connection

• AM IF/RF

Test Stage

Specified Value/

Adjusting

Point

Instrument

Connection

AM IF L11

MW Band fL: L6

Coverage fH: TC3

MW Tracking fL(600 kHz): L3

fH(1,400 kHz):TC4

SW1 Band fL(2.3 MHz): L7

Coverage fH(7.3 MHz): TC5

SW1 fL(2.6 MHz): L4

Tracking fH(6 MHz): TC6

SW2 Band fL(7.3 MHz): L8

Coverage fH(22 MHz): TC7

SW2 fL(8.5 MHz): L5

Tracking fH(19 MHz): TC8

Input: Antenna

Output: Pin 9 of IC2

Input: Antenna

Output: Headphone Socket

(Load resistance:

32 ohms)

10 pF

1M ohm

10K ohm

TO FREQUENCY

COUNTER

Pin 13 of IC2

Pin 21 of IC2

FET: 2SK212

(or Other 2SK Type FET.)

G

D

S

0.1 µF

Specified Value

Beat Cancel A: 104 ± 4 kHz

B: 94 ± 4 kHz

C: 100 ± 4 kHz

DECK SECTION

• Bias Oscillation

• Beat Cancel Switch: C

L301 100 kHz + 4 kHz Pin 1 of CNS102

Adjustment Point Specified value Instrument

Connection

1 2 3 4 5 6 7 8 9 10 11 12 ... 39 40

Comments to this Manuals

No comments