Read Sharp CD-DP900 (serv.man16) Service Manual online
– 17 –
CD-DP900H/E
Figure 17-2
CD ERROR CODE DESCRIPTION
Error
Explanation
01
When Pickup set inner position, inner switch
cannot detect 'ON' level for 10 secs.
cannot detect 'ON' level for 10 secs.
When tray moves to Open/Close, Open/Close switch
10*
cannot detect 'ON' level for 7 secs.
When disc table rotate to target position.
Clamp switch cannot detect 'ON' level for 7 secs.
When disc table rotate to target position.
Clamp switch cannot detect 'ON' level for 7 secs.
When disc table set to Disc1 position for 1 st time,
11*
"CLAMP SW", "DISC NO SW" and "OPEN/CLOSE"
cannot detect 'ON' level for 14 secs.
cannot detect 'ON' level for 14 secs.
31
When it changes to CD function, DSP cannot read
initial data.
initial data.
T
T
EFBL
FDO
TE
Stopped
CH1=500 mV
DC 10:1
CH2=200 mV
DC 10:1
CH3=1 V
DC 10:1
500 ms/div
(500 ms/div)
NORM:20 kS/s
1
2
3
=Record Length=
Smoothing : ON
CH1 : 0.000 V
CH2 : 0.000 V
CH2 : 0.000 V
Main : 100K
Zoom : 2k
Zoom : 2k
Mode : SINGLE
Type : EDGE CH1
Delay : 0.0 ns
Hold off : 0.2
Type : EDGE CH1
Delay : 0.0 ns
Hold off : 0.2
µ
s
CH3 : 0.00 V
CH4 : 0.00 V
CH4 : 0.00 V
BW : FULL
=Trigger=
=Filter=
=Offset=
CH2
v/DIV
200 mV
v/DIV
200 mV
1999/04/05 20:26:47
Test Stage
Frequency
Frequency
Display
Setting/
Adjusting
Parts
Instrument
Connection
CD SECTION
•••••
AM IF/RF
Signal generator: 400 Hz, 30%, AM modulated
*1. Input: Antenna
Output: TP302
*2. Input: Antenna
Output: TP301
TUNER SECTION
fL: Low-range frequency
fH: High-range frequency
fH: High-range frequency
AM IF
450 kHz
1,702 kHz
T351
*1
AM Band
—
530 kHz
(fL): T306
*2
Coverage
1.1
±
0.1 V
AM Tracking 990 kHz
990 kHz
(fL): T303
*1
Figure 17-1 ADJUSTMENT POINTS
Items adjusted automatically
(1) Offset adjustment (The offset voltage between the head
amplifier output and the VREF reference voltage is
compensated inside the IC.)
compensated inside the IC.)
* Focus offset adjustment
* Tracking offset adjustment
* Tracking offset adjustment
(2) Tracking balance adjustment (waveform drawing
Fig.17-2 EFBL)
(3) Gain adjustment (The gain is compensated inside the IC
so that the loop gain at the gain crossover frequency will
be 0 dB.)
be 0 dB.)
* Focus gain adjustment
* Tracking gain adjustment
* Tracking gain adjustment
• Adjustment
T303
CF301
T351
CF352
CF351
CF302
R357
IC303
T306
IC302
FE301
CNP301
SO301
FM75 ohms
FM75 ohms
AM LOOP
ANTENNA
ANTENNA
MAIN PWB
AM Tracking
AM Band Coverage
AM IF
TP301
TP302
* 'CHECKING'
If Error is detected, 'CHECKING' will be display instead of 'ER-
CD**' display. 'ER-CD**' display will only be display when
error had been detected for the 5 th times.
If Error is detected, 'CHECKING' will be display instead of 'ER-
CD**' display. 'ER-CD**' display will only be display when
error had been detected for the 5 th times.
Display
