DOWNLOAD Sharp PN-K321 (serv.man3) Service Manual ↓ Size: 23.33 MB | Pages: 127 in PDF or view online for FREE

Model
PN-K321 (serv.man3)
Pages
127
Size
23.33 MB
Type
PDF
Document
Service Manual
Brand
Device
Monitor
File
pn-k321-sm3.pdf
Date
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Sharp PN-K321 (serv.man3) Service Manual ▷ View online

CHAPTER 6. DISASSEMBLY AND ASSEMBLY
PN-K321/K322B　DISASSEMBLY AND ASSEMBLY  6 – 18
16. CABLE CLAMP                                                                                                     
1 ) Cable Clamp described below for the location.
3
: ’13.Dec
PN-K321/K322B TROUBLESHOOTING 7 - 1 
 
CHAPTER 7.  TROUBLESHOOTING 
 
No Description 
1 
THE POWER IS NOT SUPPLIED (THE LED DOES NOT LIGHT UP) 
2 
THE DISPLAY DOESN’T SHOW/ DISPLAY ABNORMALITY 
3 
THE BACKLIGHT DOES NOT LIGHT UP 
4 
SOUND IS NOT REPRODUCED/ REPRODUCED SOUND ABNORMALITY (PROBLEM 
WITH MAIN UNIT) 
5 
CANNOT CONTROL RS-232C CONNECTION 
6 
THE RED LED BLINKS 
7 
THE LED LIGHTS UP IN ORDER OF RED -> GREEN -> RED -> GREEN 
8 
IMPLEMENTING COUNTERMEASURES TO DEFECTIVE PARTS 
 
 
1. THE POWER IS NOT SUPPLIED (THE LED DOES NOT LIGHT UP)                     
   
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
:’13/Dec 
No
Is the AC cord inserted to AC adaptor properly?
Insert the AC cord to AC adaptor properly.
䚷
Yes
No
Is the DC jack properly inserted?
Insert the AC cord or DC jack properly.
䚷
Yes
Is the power SW turned ON?
Is the power SW free from any abnormality?
Abnormality found. Replace the abnormal part.
ẅ
No abnormality found.
Is the input voltage (approx. 19.5V) input to the input
connector CN1 on DC-DC PWB unit from the AC adaptor
properly?
Abnormality found. Replace AC adaptor.
䚷
No abnormality found.
Are the powers BU5V (approx. 5V), MAIN12V (approx. 12V),
BKLTPOW19.5V (approx. 19.5V) and LCD12V (approx.
12V), output from the connector on DC-DC PWB unit?
No
Replace DC-DC PWB unit.
Yes
Check the Main I/F PWB and the related parts listed below
for any abnormality:
Abnormality found.
- Power cable
Replace the abnormal part.
- Fuses F3200, F3201, F3202 (Are they blown out?)
Replace the Main I/F PWB.
- RS232C communication (Is it capable of communicating
using RS232C?)
- Main I/F PWB
䚷
No abnormality found.
Check the Key PWB and the related parts listed below for
any abnormality
Abnormality found.
- Connection cable
Replace the abnormal part.
- Key PWB
Replace the Switch PWB.
[Caution]
If no signal is being input, the power-save function will 
be activated that the output is blocked in a few 
seconds.
PN-K321/K322B TROUBLESHOOTING 7 - 2 
 
2. THE DISPLAY DOESN’T SHOW/ DISPLAY ABNORMALITY
                               
 
 
 
3. THE BACKLIGHT DOES NOT LIGHT UP                                                 
 
:’13/Dec 
PN-K321/K322B TROUBLESHOOTING 7 - 3 
 
4. SOUND IS NOT REPRODUCED/ REPRODUCED SOUND ABNORMALITY                     
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
5. CANNOT CONTROL RS-232C CONNECTION
                                             
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
:’13/Dec 
Yes
Is the audio set to MUTE or sound volume too low?
Set or adjust the setting again.
䚷
No
No
Is same source selected for input selection and audio
signal input?
Adjust the input source properly.
䚷
Yes
Check the audio input signal for any abnormality as listed
below:
Abnormality found.
- Cable connection
Replace the abnormal part.
- Audio cable
䚷
No abnormality found.
Check the audio output cable for any abnormality as listed
below:
Abnormality found.
- Cable connection
Replace the abnormal part.
- Audio cable
䚷
No abnormality found.
- Check the embedded speakers and the related parts
listed below for any abnormality:
Abnormality found.
- Speaker cable
Replace the abnormal part.
- Speaker
䚷
No abnormality found.
- Check the Main I/F PWB and the related parts listed
below for any abnormality:
Abnormality found.
- Connection cable
Replace the abnormal part.
- Fuses F3200, F3201, F3202 (Are they blown out?)
Replace the Main I/F PWB.
- RS232C communication (Is it capable of communicating
using RS232C?)
- Main I/F PWB
Yes
Is the setting set to LAN control?
Change the setting to RS-232C control.
䚷
No
No
Are the RS-232C settings available on display (as shown
below) set properly?
Correct the settings.
- Baud rate
- Data length
- Parity
- Stop bit
- Flow control
䚷
Yes
No
Are the RS-232C settings available on PC set properly?
Correct the PC settings.
䚷
Yes
Defect found.
Any defect with the RS-232C cable?
Replace the abnormal part.
䚷
No defect found.
Defect found.
Any defect with the cable connection (IN/OUT) ?
Replace the abnormal part.
䚷
No defect found.
No
Are there proper number of units connected? (Max. 25
units)
Check the number of unit connected  (Max. 25
units)
䚷
Yes
- Check the Main I/F PWB and the related parts listed
below for any abnormality:
Abnormality found.
- Connection cable
Replace the abnormal part.
- PWB
Replace the Main I/F PWB.
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