Chapter 2. Adjustments; Mechanism Section; Tuner Section; Cd Section - Sharp CD-MPS777H Service Manual

CD-MPS777H
Audio CHAPTER 2. E Market CD-MPS777H Service Manual CD-MPS777H
ADJUSTMENTS

[1] Mechanism section

• Driving Force Check
Torque Meter
Play: TW-2111
• Torque Check
Torque Meter
Play: TW-2111 30 to 80 g.cm
Fast forward: TW-2231 —
—
• Tape Speed
Test Tape Adjust-
ing Point
Normal MTT-111 Variable
speed Resistor in
motor.
TAPE MECHANISM
Tape
Motor
Figure 2-1

[2] Tuner section

fL: Low-range frequency
fH: High-range frequency
• AM IF/RF
Signal generator: 400 Hz, 30%, AM modulated
Test Stage Frequency Frequency
Display
AM IF 450 kHz 1,620 kHz
AM Band — 522 kHz
Coverage
AM 990 kHz 990 kHz
Tracking
*1. Input: Antenna Output: TP302
*2. Input: Antenna Output: TP301
Specified Value
Tape 1: Over 80 g
Tape 2: Over 80 g
Specified Value
Tape 1 Tape 2
30 to 80 g.cm
70 to 180 g.cm
70 to 180 g.cm
Specified Instrument
Value Connection
3,000 ± 30 Hz
Speaker Ter-
Speaker minal (Load
resistance: 6
ohms)
Variable Resistor in motor
Setting/ Instrument
Adjusting Connection
Parts
T351 *1
(fL): T306 *2
1.1 ± 0.1 V
(fL): T303 *1
• FM IF
Notes:
1. Description of the "FM IF Adjustment" is not carried on this Man-
ual. It is because the IF coil in the FM front end section has been
best adjusted in the factory so that its further adjustment is not
needed at the field. When replacing the FM front end assembly, no
adjustment is needed either.
2. The parts in the FM front end section are prepared in a complete
unit, so you can't obtain each part individually.
MAIN PWB
SO302
FM ANTENNA
TERMINAL
T303
AM TRACKING
fL
Figure 2-2 Adjustment Points

[3] CD section

CD Error code description
Error
01 When Pickup set inner position, inner switch cannot detect
'ON' level for 10 secs.
10* CAM error. Can't detect CAM switch when CAM is moving.
11* When it detect cam operation error during initialize pro-
cess.
20* TRAY error. Can't detect TRAY switch when TRAY is mov-
ing.
21* When it detect TRAY operation error during initialize pro-
cess.
31 When it change to CD function, DSP cannot read 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.
2 – 1
1
TP301
T351
R380
AM IF
L354
TP302
T306
R356
AM BAND
COVERAGE fL
Explanation