Wednesday, December 30, 2015

PIONEER VSX-519V-K Service mode Idle current adjustment and Capacitor discharging

Contents of this article 

  • How to enter to service mode 
  • Protection mode resetting
  • Idle current adjustment 

PIONEER VSX-519V-K 

Reset mode for numbers of protection detections
Purpose
For clearing all the counts of protection detections. (This mode resets the counts of protection detections.)
How to enter/exit
During Standby mode, simultaneously press and hold the [STANDARD SURROUND] and [STANDBY/ON] keys for 10 seconds to enter this mode.
The display will return to the normal indication when no key operation is performed for 5 seconds.
Detailed explanations
1. When the procedures for Reset mode for numbers of protection detections are completed, all the counters will be reset to “000.”
2. Prohibitions:
The protection detection counts cannot be cleared (reset to 000) with the MEMORY CLEAR process. They can only be cleared when the procedures of Reset mode are completed.
The unit’s operation when a error is detected
Purpose
# The unit’s operation when a DC/OVER/TEMP error is detected is described here.
# How to cancel the status after detection of a DC error is described here, because no key input will be accepted after a DC error detection.
How to cancel the status after detection of the DC error
(STANDBY state) (Normal display) [ADVANCED SURROUND] + [STANDBY/ON] (press and hold the keys for 2 seconds.)
 IDLE CURRENT ADJUSTMENT
Measurement Points
Adjustment Points
Procedure
TP201FL 3PIN : TEST POINT(+)
TP201FL 1PIN : TEST POINT(-)

VR201FL
1. Turn on the power.
2. Perform aging for one minute.
3. Connect a digital voltmeter to the measurement point.
4. Turn the adjustment VR so that the voltage becomes
in 2.0 mV ± 0.2 mV.
(Condition : No signal and no load)
TP201FR 3PIN : TEST POINT(+)
TP201FR 1PIN : TEST POINT(-)

VR201FR
TP201C 3PIN : TEST POINT(+)
TP201C 1PIN : TEST POINT(-)

VR201C
TP201SL 3PIN : TEST POINT(+)
TP201SL 1PIN : TEST POINT(-)

VR201SL
TP201SR 3PIN : TEST POINT(+)
TP201SR 1PIN : TEST POINT(-)

VR201SR

SERVICE MODE
Purpose
The numbers of detections for various protection processes are displayed.
How to enter/exit
During Standby mode, simultaneously press and hold the [PRESET –] and [STANDBY/ON] keys for 2 seconds to enter this mode.
The display will return to the normal indication when no key operation is performed for 5 seconds.
Discharging
P.C.B SUB ASSY (MAIN) Capacitor (C179, C180)
Procedures
(1) Unplug the power cord.
(2) Disconnect the 8P CONNECTOR wire that connects the CN202 of the P.C.B SUB Assy (AMP) and CP107 of the P.C.B SUB Assy (MAIN) from the CP107.
(3) Connect CP107 B+ (Pins 5 and 6) and B- (Pins 7 and 8, respectively) terminals, using resistor leads with 47-100 ohms
(2 W or higher), for discharging.
*Discharging time: 30-60 seconds, depending on the level of resistance.
(4) Check that the voltage between the B+ and GND terminals, as well as that between the B- and GND terminals, is less than 1 V, using a tester.
*Be sure to connect the GND terminal of the tester to the chassis.
*If the voltage is still 1 V or higher, repeat Step (3).

FL-30 V Capacitor
Procedures
(1) Unplug the power cord.
(2) Connect CP704 -30 V (Pins 1 and 2) of the P.C.B SUB Assy (FRONT) and GND (Pins 3 and 4, respectively), using
resistor leads with 47-100 ohms (2 W or higher), for discharging.
*Discharging time: 5-10 seconds, depending on the level of resistance.
(3) Check that the voltage between the -30 V and GND terminals is less than 1 V, using a tester.
*Be sure to connect the GND terminal of the tester to the chassis.
*If the voltage is still 1 V or higher, repeat Step (2).

Notes on Ground Points Connection
Note 1
When reassembling after disassembling the product for repair, before connecting the power cord, make sure that the 2P wire from the CN206 of the P.C.B SUB Assy (DSP) is connected to the CP803 of the P.C.B TOTAL Assy (INPUT).
If the power is turned ON without the above connection, the CODEC IC (IC109: AK4588) of the P.C.B SUB Assy (DSP) may be damaged.

Note 2
During repair, before checking the P.C.B SUB Assy (MAIN), etc., with the rear chassis removed, be sure to connect the GND terminal of the main capacitor to the rear chassis (TUNER PACK CHASSIS), as shown below, then connect the power cord.
Without grounding connection, the protection circuit will be activated. After repairing, be sure to remove the ground wire before reassembling.