Technics SL-PD687 Service Manual

‘SL-PD687
MISELF-DIAGNOSTIC DISPLAY FUNCTION
Self-diagnostic display
This unit is equipped with a self-diagnostic display function which, if a problem occurs, will display an
error code corresponding to the problem.
Use this function when performing maintenance on the unit.
Display procedure
Display location
in w
[Entering the Self-Diagnostic Mode|
1. With no CD loaded in the tray, turn on the unit.
2. Unplug the power cord of the unit, and then plug it back
buttons together.
3, Release the above three buttons.
pressing the STOP (IM), PLAY (B>) and DISC 4
This will bring up the FL displa
[To Display Self-Diagnostic Results
1, When the FL display lights up, the unit automatically
repeats an approximately 50-second cycle of the follow:
ing operations.
Selt-diagnostic display location
<>
Gr a?
<2 ©
Disc button (DISC 4)
3% -+{Tray opens. | —+[Tray closes.
®
2 eEaeal
1®
[Tray opens. }+—Traverse deck lifts.
¢
[Tray closes. | © -frraverse ‘deck lowers. |
t
Rotary tray turns counter-clockwise two disc slots.
‘Stop button (MH) Play button (b>)
1©
Traverse deck lifts once, and then lowers.
‘Traverse deck lifts once, and then lowers.
lary tray turns clockwise one disc slot.
T
Rotary tay turns clockwise three disc slots |-°-+{ Traverse deck lifts once, and then lowers.
zi
FFraverse deck lifts once, and then lowers }+ °—{Rotary tray turns counterclockwise one aise slot
t
Rotary tray turns counterclockwise two disc slots. |
2. Self-diagnostic fault results appear on the FL display for approximately one second as “H15" at location ®,
“H16"
at
©
and
“F18”
at
aa
Ania
3. If there are no faults as a result of self-diagnostic, "////TRACK U1: tii! " appears on the FL display.
, during the above cycle.
[To Return to Normal Display|
* Press the power button to turn off the unit, and then turn it on again,
To Display Self-Diagnostic Results Again
* Follow steps 1 through 3 of “Entering Self-Diagnostic Mode” above.
[To Clear the Display of Self-Diagnostic Results
Error code
‘* Turn off the unit to clear the contents of the stored fault results.
Interpretation of error codes
Problem condition
Correction procedure
‘GD tray does not open or close when CD tray openiciose
wis, | oe taco nes Faulty loading motor and motor drive IC ((C501), of faulty
a pre contact or short-circuit on open/close detect switch,
wie | tay closes morntariy ut team opens again cr opens | Ser sca,
momentarily and then closes again.
Faulty rotary turret rotation detection.
Fis Check the optical sensor (D501) and replace it necessary.
Ml HANDLING PRECAUTIONS FOR TRAVERSE DECK
The laser diode in the traverse deck (optical pickup) may break down due to potential difference caused by static
electricity of clothes or human body.
So, be careful of electrostatic breakdown during repair of the traverse deck (optical pickup).
+ Handling of traverse deck (optical pickup)
1. Do not subject the traverse deck (optical pickup)
to static electricity as it is extremely sensitive to
electrical shock.
2. To prevent the breakdown of the laser diode, an
antistatic shorting pin Is inserted into the flexible
board (FFC).
When removing or connecting the short
the Job in as short time as possible.
3. Take care not to apply excessive stress to the
flexible board (FFC).
4, Do not turn the variable resistor (laser power
adjustment). It has already been adjusted.
in, finish
* Grounding for electrostatic breakdown
prevention
Human body grounding
Use the anti-static wrist strap to discharge the
static electricity from your body.
2. Work table gounding
Put a conductive material (sheet) or steel sheet on
the area where the optical pickup Is placed, and
ground the sheet.
Caution:
The static electricity of your clothes will not be
grounded through the wrist strap. So, take care not
to let your clothes touch the traverse deck (optical
pickup).
Variable resistor
{Bo not turn)
FRC
Be sure to short this position
(Use the shorting pin o clip)
1mQ.
tron plate or some metals
to conduct electricity

Technics SL-PD687 Specifications

General

Brand	Technics
Model	SL-PD687
Category	CD Player
Language	English