Pioneer DV-646A, Service Manual

Page: 63 / 105

63
DV-646A
7.1.2 SELF-DIAGNOSTIC FUNCTION OF PICKUP DEFECTIVE
Character in bold : Item name
: Information display
Test Mode Screen Display
Laser diode current value
Symptom
• Indicates "No Disc" in FL display.
• Player does not playback, etc..
This unit can confirm the laser diode current value (DVD: 650nm, CD: 780nm) of pickup on the Test Mode screen.
(Press the ESC
→
TEST keys in order on the test mode remote control unit (GGF1067) to enter the test mode.)
Note :
When a DVD disc or a CD disc is played in the test mode, this function is effective.
Procedure of Self-Diagnosis
1
Enter the Test mode.
2
When diagnosing the 650nm laser diode:
Press the
→
keys in order, and turn on the laser diode (It light-up for nine seconds.).
When diagnosing the 780nm laser diode:
Press the
→
keys in order, and turn on the laser diode (It light-up for nine seconds.).
When let it turn on once again after performed
2
once,
After pressed REP.B key once
650nm: Press the
→
keys in order
780nm: Press the
→
keys in order
3
Confirm the indicated value of the laser diode current (LDI). (Refer to following figure.)
4
When indicated value is more than 100, pickup is defective.
→
Replacement is necessary
Replace the Traverse Mechanism Assy or Pickup.
TEST 1
TEST 1
TEST 4
TEST 4
It's effective in case of the following condition.