Adjustment; Tuner Section - Sharp WF-1100W Service Manual

WF-1100W
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

Point
Tape 1,2:VR102 3,000 ± 60 Hz Headphones
MTT-111
DECK SECTION
• Bias Oscillation
• Beat Cancel Switch: A
Adjustment Point Specified value
L301 100 kHz + 4 kHz
Beat Cancel
• Playback Amplifier Sensitivity Check
Test tape
Specified value
2.5 V ± 3 dB
MTT-118
Specified Value
Tape 1: Over 60 g
Tape 2: Over 50 g
Specified Value
Tape 1 Tape 2
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
Value Connection
Socket
(Loadresistance:
32 ohms)
Instrument
Connection
Pin 1 of CNS102
Specified Value
A: 100 ± 4 kHz
B: 94 ± 4 kHz
C: 104 ± 4 kHz
Instrument Connection
Speaker terminal
(Load resistance: 8 ohms)
ADJUSTMENT

TUNER SECTION

fL: Low-range frequency
fH: High-renge frequency
• FM IF/RF
Test Stage
FM IF
FM Detection L10
FM Band
Coverage
FM Tracking
• AM IF/RF
Test Stage
AM IF
MW Band
Coverage
MW Tracking fL(600 kHz): L3
SW1 Band
Coverage
SW1
Tracking
SW2 Band
Coverage
SW2
Tracking
• VCO Frequency
Adjustment
Point
VR1
Note:
After preparing the test circuit shown in Fig. 6, connect the Pin
13, Pin 21 and ground of the IC2 with the test circuit, and
measure the value.
Pin 13 of IC2
10 pF
1M ohm
Figure 6 VCO FREQUENCY TEST CIRCUIT
– 6 –
Specified Value/
Adjusting
Point
L9 Input: FM Antenna
Output:Pin 9 of IC2
fL: L1 Input: Antenna
fH: TC1 Output: Headphone Socket
fL(88.0 MHz): L2 (Load resistance:
fH(108 MHz): TC2 32 ohms)
Specified Value/
Adjusting
Point
L11 Input: Antenna
Output: Pin 9 of IC2
fL: L6 Input: Antenna
Output: Headphone Socket
fH: TC3
(Load resistance
fH(1,400 kHz):TC4 32 ohms)
fL(2.3 MHz): L7
fH(7.3 MHz): TC5
fL(2.6 MHz): L4
fH(6 MHz): TC6
fL(7.3 MHz): L8
fH(22 MHz): TC7
fL(8.5 MHz): L5
fH(19 MHz): TC8
Specified value Instrument Connection
76 kHz ± 200 Hz
Pin 13, Pin 21 and ground
of IC2
Pin 21 of IC2
D
FET: 2SK212
G
(or Other 2SK Type FET.)
S
0.1 µF
10K ohm
Instrument
Connection
Instrument
Connection
TO FREQUENCY
COUNTER