Name: Pioneer VSX-918V-K
Brand: Pioneer
Rating: 5 (1 reviews)

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VSX-918V-K

6 7 8

1. SERVICE PRECAUTIONS

1.1 NOTES ON SOLDERING

1.2 AMPLIFIER FAILURE DIAGNOSIS FLOW CHART

• For environmental protection, lead-free solder is used on the printed circuit boards mounted in this unit.

Be sure to use lead-free solder and a soldering iron that can meet specifications for use with lead-free solders for repairs

accompanied by reworking of soldering.

• Compared with conventional eutectic solders, lead-free solders have higher melting points, by approximately 40 °C.

Therefore, for lead-free soldering, the tip temperature of a soldering iron must be set to around 373 °C in general, although

the temperature depends on the heat capacity of the PC board on which reworking is required and the weight of the tip of

the soldering iron.

Do NOT use a soldering iron whose tip temperature cannot be controlled.

Compared with eutectic solders, lead-free solders have higher bond strengths but slower wetting times and higher melting

temperatures (hard to melt/easy to harden).

The following lead-free solders are available as service parts:

• Parts numbers of lead-free solder:

GYP1006 1.0 in dia.

GYP1007 0.6 in dia.

GYP1008 0.3 in dia.

Amplifier failure diagnosis flow chart

When DC detection is activated ("AMP_ERR" flashes on the display), failure (damage) of the power amplifier

section is considered.

Caution:

When releasing the lock state of power key before repair, please be careful because there is the

possibility that more damages will occur when turning on the power once again!

• According to a symptom, perform the following confirmation beforehand.

1) Are there any Fuses and IC protectors open?

↓

2) After turn on the power, confirm that the supply voltage of the point that can be measured is appropriate.

(Particularly the supply voltage of the power Tr and drive step)

↓

3) Whether the voltage of pin2 and pin5 of IC601 or IC603 is equal to (VL-0.7V). If not (eg, equal to VH),

then change the corresponding power pack IC601 or IC603.

↓

4) Furthermore, check the output DC voltage of each channel of power pack IC601 and IC603

to limit the failure channel and identify the defect power pack.

↓

• After identify the failure channel, check that each part is not damaged (resistor, diode... etc. value / open /

short)

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Pioneer VSX-918V-K Specifications

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