Adjustment; Mechanism Section; Tuner Section - Sharp XL-HP700 Service Manual

MECHANISM SECTION

• • • • • Driving Force Check
Torque Meter
Play: TW-2111
• Torque Check
Torque Meter
Play: TW-2111
Fast forward: TW-2231
Rewind: TW-2231

TUNER SECTION

fL: Low-range frequency
fH: High-range frequency
• • • • • AM IF/RF
Signal generator: 400 Hz, 30%, AM modulated
Frequency
Test Stage Frequency
Display
AM IF 450 kHz 1,602 kHz
AM Band — 531 kHz
Coverage
AM Tracking 990 kHz 990 kHz
*1. Input: Antenna Output: TP302
*2. Input: Antenna Output: TP301
• • • • • FM RF
Signal generator: 1 kHz, 40 kHz dev., FM modulated
Test Stage Frequency Frequency
Display
FM Band — 87.50 MHz
Coverage
FM RF 98.00 MHz 98.00 MHz
(10-30 dB)
*1. Input: Antenna Output: TP301
*2. Input: Antenna Output: Speaker terminal
• • • • • FM IF
Signal generator: 10.7 MHz, FM modulated
Test Stage Frequency Frequency
Display
IF 10.7 MHz 98 MHz
*1. Input: Antenna Output: TP301
T351
AM IF
IC303
TP302
AM BAND
COVERAGE fL
Figure 9-2 ADJUSTMENT POINTS

ADJUSTMENT

Specified Value
Over 80 g
Specified Value
30 to 80 g.cm
70 to 180 g.cm
70 to 180 g.cm
Setting/ Instrument
Adjusting Connection
Parts
T351 *1
(fL): T306 *2
1.1 ± 0.1 V
(fL): T303 *1
Setting/ Instrument
Adjusting
Connection
Point
T301 (fL): *1
1.3 V ± 0.1 V
L312 *2
Setting/ Instrument
Adjusting
Connection
Point
T302 *1
(Turn the
core of trans-
former T302
fully counter-
clock wise)
MAIN PWB-A1
IC302
T301
FM OSC
T302
FM IF
FM/AM
LOOP
L312
ANTENNA
FM RF
TP301
T303
AM TRACKING fL
T306
• • • • • Tape Speed
Adjusting
Test Tape
Normal MTT-111 Variable
speed Resistor in
motor.
TAPE MECHANISM
Tape
Motor
CD SECTION
• Adjustment
Since this CD system incorporates the following automatic
adjustment functions, readjustment is not needed when
replacing the pickup. Therefore, different PWBs and pickups
can be combined freely.
Each time a disc is changed, these adjustments are
performed automatically. Therefore, playback of each disc
can be performed under optimum conditions.
Items adjusted automatically
(1) Offset adjustment (The offset voltage between the head
amplifier output and the VREF reference voltage is
compensated inside the IC.)
* Focus offset adjustment
* Tracking offset adjustment
(2) Tracking balance adjustment
(3) Gain adjustment (The gain is compensated inside the IC
so that the loop gain at the gain crossover frequency will
be 0 dB.)
* Focus gain adjustment
* Tracking gain adjustment
CD ERROR CODE DESCRIPTION
Error
When Pickup set inner position, inner switch
01
cannot detect 'ON' level for 10 secs.
CAM error. Can't detect CAM switch when CAM is
10*
moving.
When it detect CAM operation error during initialize
11*
process.
TRAY error. Can't detect TRAY switch when TRAY is
20*
moving.
When it detect TRAY operation error during initialize
21*
process.
When it detect invalid TRAY switch during normal
22*
operation.
When it detect invalid TRAY switch during initialize
23*
procecss.
When it change to CD function, DSP cannot read
31
initial data.
* 'CHECKING'
If Error is detected, 'CHECKING' will be displayed instead of
'ER-CD**'. 'ER-CD**' display will only be displayed when error
had been detected for the 5th times.
– 9 –
XL-HP700
Specified Instrument
Point Value Connection
3,000 ± 30 Hz
Speaker
Terminal
(Load
resistance:
6 ohms)
Variable Resistor in motor
Figure 9-1
Explanation