Sharp CD-MPS777H, Service Manual

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CD-MPS777H
2 – 1
Audio CD-MPS777H Service Manual CD-MPS777H Market E CHAPTER 2.
ADJUSTMENTS
[1] Mechanism section
• Driving Force Check
• Torque Check
• Tape Speed
[2] Tuner section
fL: Low-range frequency
fH: High-range frequency
• AM IF/RF
Signal generator: 400 Hz, 30%, AM modulated
• 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.
[3] CD section
CD Error code description
* '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.
Torque Meter Specified Value
Play: TW-2111 Tape 1: Over 80 g
Tape 2: Over 80 g
Torque Meter Specified Value
Tape 1 Tape 2
Play: TW-2111 30 to 80 g.cm 30 to 80 g.cm
Fast forward: TW-2231 — 70 to 180 g.cm
— 70 to 180 g.cm
Test Tape Adjust-
ing Point
Specified
Value
Instrument
Connection
Normal
speed MTT-111 Variable
Resistor in
motor. 3,000
±
30 Hz
Speaker
Speaker Ter-
minal (Load
resistance: 6
ohms)
Figure 2-1
Test Stage Frequency Frequency
Display
Setting/
Adjusting
Parts
Instrument
Connection
AM IF 450 kHz 1,620 kHz T351 *1
AM Band
Coverage — 522 kHz (fL): T306
1.1
±
0.1 V
*2
AM
Tracking 990 kHz 990 kHz (fL): T303 *1
*1. Input: Antenna Output: TP302
*2. Input: Antenna Output: TP301
TAPE MECHANISM
Tape
Motor
Variable Resistor in motor
Figure 2-2 Adjustment Points
Error Explanation
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.
SO302
FM ANTENNA
TERMINAL
AM IF
TP301
TP302
R356
R380
T303
T306
L354
FE301
T351
CNP301 AM
LOOP
ANTENNA
AM BAND
COVERAGE fL
AM TRACKING
fL
MAIN PWB
1