Sharp SD-EX220 (serv.man2) Service Manual ▷ View online
SD-EX220H
1 – 3
Remote control
1. Remote Control Transmitter
2. CD Play/Pause Button
3. CD Stop Button
4. Cursor/Tuner Preset Buttons
5. RDS Display Button
6. RDS Programme Type/Traffic Information Search Button
7. CD Track Down or Fast Reverse/Tuning Down Button
8. CD Memory Button
9. Programme Clear Button
2. CD Play/Pause Button
3. CD Stop Button
4. Cursor/Tuner Preset Buttons
5. RDS Display Button
6. RDS Programme Type/Traffic Information Search Button
7. CD Track Down or Fast Reverse/Tuning Down Button
8. CD Memory Button
9. Programme Clear Button
10. Surround Button
11. Timer Button
12. Enter Button
13. On/Stand-by Button
14. Auxiliary Button
15. CD Play Mode Select Button
16. Bass/Treble Button
17. Tuner (Band) Button
18. RDS ASPM (Auto Station Programme Memory) Button
19. CD Track Up or Fast Forward/Tuning Up Button
20. Volume Up and Down Buttons
21. CD/Tuner Direct Buttons
22. CD Time Display Button
23. Clock Display/Dimmer Button
11. Timer Button
12. Enter Button
13. On/Stand-by Button
14. Auxiliary Button
15. CD Play Mode Select Button
16. Bass/Treble Button
17. Tuner (Band) Button
18. RDS ASPM (Auto Station Programme Memory) Button
19. CD Track Up or Fast Forward/Tuning Up Button
20. Volume Up and Down Buttons
21. CD/Tuner Direct Buttons
22. CD Time Display Button
23. Clock Display/Dimmer Button
2
1
3
5
4
7
6
8
10
11
12
16
17
13
14
15
18
20
21
19
9
22
23
23
Buttons with " " mark in the illustration or highlighted in bold on the list can beop-
erated on the remote control only.
erated on the remote control only.
SD-EX220H
CP-EX220H
1. Tweeter
2. Bass Reflex Duct
3. Speaker Grille
4. Woofer
5. Speaker Terminals
2. Bass Reflex Duct
3. Speaker Grille
4. Woofer
5. Speaker Terminals
5
1
4
3
2
Speaker grilles are removable:
Make sure nothing comes into contact with
the speaker diaphragms when you remove
the speaker grilles.
the speaker diaphragms when you remove
the speaker grilles.
Note:
When the speakers are hung on the wall, the
speaker badge reads vertically. In this case,
you can adjust the badge to point the proper
direction by turning it manually.
speaker badge reads vertically. In this case,
you can adjust the badge to point the proper
direction by turning it manually.
Badge
SD-EX220H
2 – 1
Audio
SD-EX220H
Service Manual
Market
E
CHAPTER 2.
ADJUSTMENTS
[1] Adjustment
1. CD section
1.1. 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.
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 preformed auto-
matically. Therefore, playback of each disc can be preformed under
optimum conditions.
matically. Therefore, playback of each disc can be preformed under
optimum conditions.
2. 1-bit amp. section
2.1. 1-bit amplifier's output offset voltage adjustment
Adjust VRA100 and VRA101 so that the DC voltage between speaker
terminals + and - is set to 0 ± 5 mV at AC 230 V.
terminals + and - is set to 0 ± 5 mV at AC 230 V.
OUTPUT OFFSET LEVEL
ADJUSTMENT POINTS
[2] To Check and Cancel Protect Circuit
Detection Line
1. In this model the microcomputer (IC701) detects
the following malfunctions once power is sup-
plied, and cuts off power from all the parts except
for the circuit driving the microcomputer.
plied, and cuts off power from all the parts except
for the circuit driving the microcomputer.
1. Abnormal drop in the output voltage of each regulator
(below approx. 1.5 V)
Power is cut off instantly without display.
Power is cut off instantly without display.
2. Output offset over voltage of the 1-bit amplifier
(above approx. DC 2 V)
3. Mains overvoltage of the 1-bit amplifier
(above approx. DC 5.5 A)
Power is cut off instantly without display.
Power is cut off instantly without display.
4. Defects in the cooling fan or its drive circuit
(when stopped)
Power is cut off after “FAN LOCK” is displayed.
Power is cut off after “FAN LOCK” is displayed.
2. Criteria for abnormality, and checking and cancel-
ling the detection line
2.1. The criteria:
1. The voltage of pin 6 (PROTECT) on IC701.
2. The voltage of pin 32 (OFFSET) on IC701: Low (below approx. 1 V)
(abnormal) and High (above approx. 2.5 V) (normal) .
3. The motor stops when it is above approx. 1 V.
If the voltage of pin 10 (FAN LOCK) on IC701 is not between
approx. 0.21 V and 0.9 V whilst the motor rotation is controlled, it is
judged as abnormal.
approx. 0.21 V and 0.9 V whilst the motor rotation is controlled, it is
judged as abnormal.
2.2. Checking and cancelling the detection line:
Caution: If the PROTECT/OFFSET detection line is disconnected in
case of 1, 2 or 3 above, a protective operation does not function. The
disconnection by output short-circuit of each regulator may cause the
parts or PCBs to burn out and therefore do not disconnect the detec-
tion line when the cause is not identified.
case of 1, 2 or 3 above, a protective operation does not function. The
disconnection by output short-circuit of each regulator may cause the
parts or PCBs to burn out and therefore do not disconnect the detec-
tion line when the cause is not identified.
(Power supply can be detected with an oscilloscope or like during
approx. 0.5 seconds after an abnormality is found. Note that the detec-
tion would be difficult with a tester as the voltage rises and falls rap-
idly.)
approx. 0.5 seconds after an abnormality is found. Note that the detec-
tion would be difficult with a tester as the voltage rises and falls rap-
idly.)
1. Abnormal drop in the output voltage of each regulator
Connect a measuring device (such as an oscilloscope) to the stabiliz-
ing output of the regulator, and turn on the unit. If the detected voltage
is extremely lower than the voltage on the circuit diagram (below
approx. 1.5 V), the regulator itself or the circuit is defective.
ing output of the regulator, and turn on the unit. If the detected voltage
is extremely lower than the voltage on the circuit diagram (below
approx. 1.5 V), the regulator itself or the circuit is defective.
2. Output offset overvoltage of the 1-bit amplifier
Adjust the voltage of the output offset. If a protective operation is still
activated, ICA401 on the 1-bit amplifier could be defective (the detec-
tion circuit of the speaker output DC voltage).
activated, ICA401 on the 1-bit amplifier could be defective (the detec-
tion circuit of the speaker output DC voltage).
Electronic
Voltage
SO421
AC 230 V
Set
Output:
Speaker Terminal
+
-
VR : 0
Input : AUX
L-CH Output
Offset Adjustment
R-CH Output
Offset Adjustment
VRA101
VRA100
1-BIT AMP. PWB
SD-EX220H
2 – 2
[3] Test mode
During POWER OFF Mode, push below each 2 buttons and [POWER] button.
Then enter to each TEST MODE.
Version Display
Other Destination : [ME**** ]
Version Display : ME0701A_ (07: MONTH; 01: DAY; A/B/C (MICOM VERSION)
No.
Key
Test Mode
1
[SKIP UP] + [VOLUME DOWN]
ALL CLEAR (RESET)
2
[CD STOP] + [SKIP UP]
BUTTON & DISPLAY TEST
3
[CD PLAY/PAUSE] + [AUX]
CD TEST
4
[CD PLAY/PAUSE] + [SKIP UP]
CD TRAY AGING TEST
5
[TUNER (BAND)] + [VOLUME DOWN]
TUNER PRESET MEMORY CLEAR
6
[TUNER (BAND)] + [VOLUME UP]
TUNER PRESET MEMORY FOR PRODUCT
7
[TUNER (BAND)] + [CD STOP]
RDS TUN SM
8
[AUX] + [VOLUME UP]
AUX TEST
SD-EX220H
3 – 1
Audio
SD-EX220H
Service Manual
Market
E
CHAPTER 3.
MECHANISM BLOCKS
[1] Disassembly
Caution on Disassembly
Follow the below-mentioned notes when disassembling the unit and reassembling it, to keep it safe and ensure excellent performance:
1. Be sure to remove the power supply plug from the wall outlet before starting to disassemble the unit.
2. Take off nylon bands or wire holders where they need to be removed when disassembling the unit. After servicing the unit, be sure to rearrange the
leads where they were before disassembling.
3. Take sufficient care on static electricity of integrated circuits and other circuits when servicing.
1
Rear Cabinet
1. Screw ...................... (A1) x7
2
Main PWB/
1. Screw ...................... (B1) x7
Tuner Unit
2. Jack Cover, Left ...... (B2) x1
(Note)
3. Screw ...................... (B3) x4
4. Socket ..................... (B4) x9
5. Flat Cable ............... (B5) x1
4. Socket ..................... (B4) x9
5. Flat Cable ............... (B5) x1
3
Front Panel
1. Screw ...................... (C1) x5
2. Hook ........................ (C2) x1
3. Socket ..................... (C3) x1
3. Socket ..................... (C3) x1
4
Power PWB
1. Screw ...................... (D1) x6
2. Bracket .................... (D2) x1
5
1-Bit Amp. Unit
1. Screw ...................... (E1) x2
6
Display PWB
1. Screw ....................... (F1) x6
2. Frame Support ......... (F2) x1
3. Screw ....................... (F3) x6
4. Socket ...................... (F4) x2
3. Screw ....................... (F3) x6
4. Socket ...................... (F4) x2
7
Headphones PWB 1. Screw ...................... (G1) x1
8
Switch PWB
1. Screw ...................... (H1) x1
9
CD Mechanism
1. Screw ....................... (J1) x4
2. Screw ....................... (J2) x2
2. Screw ....................... (J2) x2
10
Protect Circuit
1. Screw ...................... (K1) x2
PWB/1-Bit Amp.
2. Socket ..................... (K2) x1
Shield Case
3. Screw ...................... (K3) x2
4. Bracket .................... (K4) x1
5. Screw ...................... (K5) x3
4. Bracket .................... (K4) x1
5. Screw ...................... (K5) x3
11
1-Bit Amp. PWB
1. Screw ....................... (L1) x3
STEP
REMOVAL
PROCEDURE
SD-EX220H
Note:
1. After removing the connector for the optical pickup from the
connector, wrap the conductive aluminium foil around the front end
of the connector so as to protect the optical pickup from electro-
static damage.
of the connector so as to protect the optical pickup from electro-
static damage.
(A1)x4
φ3x10mm
(A1)x3
φ3x12mm
Rear
Cabinet
Cabinet
Front
Panel
(B1)x2
φ3x8mm
(B3)x1
φ3x10mm
Main PWB
Washer
Tuner Unit
Front Panel
(B4)x5
(B4)x3
(B5)x1
(B4)x1
(B2)x1
(B1)x4
φ3x10mm
(B3)x3
φ3x10mm
(B1)x1
φ3x8mm
1-Bit Amp.
Unit
Unit
(D2)x1
(C3)x1
(C1)x3
φ3x8mm
(C1)x2
φ3x10mm
(E1)x2
φ3x6mm
(D1)x6
φ3x10mm
Power PWB
1-Bit Amp. Unit
(C2)x1
Front
Panel
Panel
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