Adjustment - Sharp JG545X(GY) Service Manual

MECHANISM SECTION
Driving Force check
l
Torque Meter
Play: TW-2412
Reverse play: TW-2422
Torque Check
l
Torque Meter
Head Azimuth
l
Test Tape
Tape Speed
l
Test Tape Adjusting Specified value Instrument Connection
Point
3,000 + 90 Hz
Specified value
Over 30 g
Over 30 g
Specified value
I 20 to 50 a.cm
Instrument Connection
Headphones Socket
Figure 5 ADJUSTMENT POINTS
TUNER SECTION
AM IF/RF
l
rest Stage Adjusting Point
2 1. VRl (fH)
2. VR2
3 1. VRl (fL)
2. VR3
4 Repeat steps 2 and 3 until no further improvement
I
can be made.
3and
(1,650 kHz)
Tracking
(I ,400 kHz)
FM IF/RF
l
Test Stage Adjusting Point
IF
Checking
Band
coverage
Tracking
AMBANDCOVERAGE
Specified Value/
Instrument Connection
(input: Antenna
Output: TP5)
Voltage Vt = Obtain 9 +O.l V
(Input: Antenna
Output: TPl)
Voltage Vt = Obtain 1.5 + 0.03 V
(input: Antenna
Obtain the best output.
(Input: Antenna.
Output: TP3)
Maximize the output.
(Input: Antenna
Output: Headphones Socket)
(Lord resistance: 24 ohms)
Maximize the output.
(input: Antenna
Output: Headphones Socket)
(Lord resistance: 24 ohms)
Specified Value/
Instrument Connection
Check the S curve to the center.
(Input: TP2
Output: TP3)
Maximize the output.
(Input: TP4
Output: Headphones Socket)
(Lord resistance: 24 ohms)
Maximize the output.
(Input: TP4
Output: Headphones Socket)
(Lord resistance: 24 ohms)
FM BAND COVERAGE