Pioneer PDP-501MX Saha Servis Kılavuzu - Sayfa 13

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PDP-V402

TROUBLESHOOTING

1. MAIN POWER ASSY

Check the power supply voltages.

Measurement Points

VADR (60V) (TP3401) –– ADR. GND (TP3402)

VSUS (170V) (TP3301) –– SUS. GND (TP3302)

VOFS (140V) (TP3601) –– OFS.GND (TP3602)

+B (215V) (TP3101) –– P. GND (TP3102)

VCP (12V) (TP3203) –– CP. GND (TP3204)

+13.5V (TP3205) –– A. GND (TP3206)

VCC (5V) (TP3201) –– D. GND (TP3202)

2. SUB POWER ASSY

Check the power supply voltages.

VCSP (40V) ..... TP1603

+12V – YVSUS/2

SP2

+12V – XVSUS/2

SP2

+12.5V – GND

SP3

+12.5V – GND

SP5

+12.5V – GND

SP6

Note: Take note that the CSP. GND differs from the GND

potential of the unit.

TOP

TP3301

TP3302

(VSUS)

(SUS. GND)

D3305

TP3101

(+B)

TP3102

(P. GND)

154

If normal, LED (D3405) lights.

If normal, LED (D3305) lights. (which displays the timing of VCC and VSUS)

POWER ON: lights in red (VCC ON) = lights in yellow (VSUS ON) at 1–2sec

POWER OFF: lights in yellow = lights in red at 1–2sec = LED OFF

abnormal POWER OFF: lights in yellow = lights in green = LED OFF

If normal, LED (D3205) lights.

CSP. GND ........... TP1604

= Y DRIVE (A) ASSY

= X DRIVE (A) ASSY

= CONTROL ASSY

= ANALOG VIDEO ASSY

= INPUT CONTROL ASSY

TP3201

(VCC+5V)

TP3205

TP3202

(+13.5V)

(D. GND)

D3205

TP3401

(VADR)

TP3204

(CP. GND)

TP3206

(A. GND)

D3405

TP3402

(ADR. GND)

MAIN POWER ASSY

(VSUS OFF earlier than VCC OFF)

(VCC OFF earlier than VSUS OFF)

[Precautions for servicing]

1. As the P.D. circuit starts operating when the rear cover is

removed and the CN5801 connector of the FAN RELAY

ASSY is disconnected, short between TP3802 and TP3803.

2. For normal signals, set the rear selection SW S1201 (INPUT

CONTROL ASSY) to OFF. When G on sync signals are

output by Mac, set the switch to ON to prevent overlapping

of the sync. signal.

FAN P. D.

TP3803

TP3802

TP3602

(OFS. GND)

TP3203

TP3601

(VCP)

(VOFS)

TP1603

(+40V)

SP2

TP1604

(CSP. GND)

SP3

SP5

SP6

SUB POWER ASSY