Yamaha XH-150 Service Manual

POWER AMPLIFIER

XH150

SERVICE MANUAL

011441

19990210-140000

CONTENTS

SPECIFICATIONS ……………………………………………3/4 PANEL LAYOUT ……………………………………………… 5 DIMENSIONS ………………………………………………… 6 BLOCK DIAGRAM …………………………………………… 6 CIRCUIT BOARD LAYOUT & WRING …………………… 7 DISASSEMBLY PROCEDURE ……………………………… 8 IC BLOCK DIAGRAM ………………………………………… 12 CIRCUIT BOARDS …………………………………………… 13 INSPECTIONS ……………………………………………15/17 PARTS LIST

1.97K-9636 1.92K-173 Printed in Japan '99.2

XH150

IMPORTANT NOTICE

This manual has been provided for the use of authorized Yamaha Retailers and their service personnel. It has been assumed that basic service procedures inherent to the industry, and more specifically Yamaha Products, are already known and understood by the users, and have therefore not been restated.

WARNING: Failure to follow appropriate service and safety procedures when servicing this product may result in personal injury,

destruction of expensive components, and failure of the product to perform as specified. For these reasons, we advise all Yamaha product owners that all service required should be performed by an authorized Yamaha Retailer or the appointed service representative.

IMPORTANT: The presentation or sale of this manual to any individual or firm does not constitute authorization, certification or

recognition of any applicable technical capabilities, or establish a principle-agent relationship of any form.

The data provided is believed to be accurate and applicable to the unit(s) indicated on the cover. The research, engineering, and service departments of Yamaha are continually striving to improve Yamaha products. Modifications are, therefore, inevitable and changes in specification are subject to change without notice or obligation to retrofit. Should any discrepancy appear to exist, please contact the distributor's Service Division.

WARNING: Static discharges can destroy expensive components. Discharge any static electricity your body may have

accumulated by grounding yourself to the ground buss in the unit (heavy gauge black wires connect to this buss).

IMPORTANT: Turn the unit OFF during disassembly and part replacement. Recheck all work before you apply power to the unit.

WARNING: CHEMICAL CONTENT NOTICE!

The solder used in the production of this product contains LEAD. In addition, other electrical/electronic and /or plastic (where applicable) components may also contain traces of chemicals found by the California Health and Welfare Agency (and possibly other entities) to cause cancer and/or birth defects or other reproductive harm.

DO NOT PLACE SOLDER, ELECTRICAL/ELECTRONIC OR PLASTIC COMPONENTS IN YOUR MOUTH FOR ANY REASON WHA TSOEVER!

Avoid prolonged, unprotected contact between solder and your skin! When soldering, do not inhale solder fumes or expose eyes to solder/flux vapor!

If you come in contact with solder or components located inside the enclosure of this product, wash your hands before handling food.

SPECIFICATIONS

•General Specifications

Power Output Level 20 Hz-20 kHz THD+N= 0.1 % Power Bandwidth Halfpower THD+N 20 Hz-20 kHz, Half Power Frequency Responce Intermodulation Distortion 60 Hz:7 kHz,4:1,Half Power Channel Separation Half Power ATT.max input 600 ohm shunt Residual Noise Att,min 12.7 kHz LPF

IHF-A Network S/N ratio Slew Rate Sensitivity(Att.max)Rated Power Voltage GAIN Att.max Input Impeddance Controls Front Panel

Rear Panel

Connectors Input

Output Indicators POWER

PROTECTION

CLIP

SLGNAL Protection circuit

Fan Circuit PC Limitter Power Requirements

Idle Power Consumption 1/8 Power Consumption (32 ohm) Maximum Power Consumption (32 ohm) Dimentions (W Weight

x H x

150 W+150 W

RL= 64 ohm (100 V)

RL= 32 ohm (70 V)

10 Hz- 40 kHz (THD + N= 0.1 %)

0.1 %

0 dB,+0.5 dB,-1 dB F= 20 Hz-50 kHz

0.1 %

>/– 65 dB 20 Hz-20 kHz

</– -65 dB </– -65 dB

100 dB

+/–

35 V/uS

+4 dBu (100 V)+1 dBu (70 V)

38.2 dB 30 kohm (balance) 15 kohm (unbalance) POWER switch (push on/push off) Attenuator (31position)

2 MODE switch(STEREO/BRIDGE/PARALLEL) Filter switch LOW CUT

HIGH CUT

2 (-12 dB/oct)

2 (-6 dB/oct) Barrier strip terminal XLR-3-31 type Barrier strip terminal Green

2 (Red)

2 (Green) POWER switch on/off mute DC detection TEMP (heatsink temp>/–90˚C) Low Speed (50˚C) Variable, High Speed (70˚C) RL</–16 ohm Japan model 100 V, 50/60 Hz US and Canada model 120 V, 60 Hz Europe model 230 V, 50/60 Hz AT model 240 V, 50/60 Hz 45 W 350 W 850 W

480

132.0 x 319 mm 16 Kg 0 dB=0.775 V Half power= 1/2 Power output level

XH150

PANEL LAYOUT

Front Panel

XH150

1 2

ON OFF

1 POWER switch and indicator 2 SIGNAL indicators 3 CLIP indicators 4 PROTECTION indicator

Rear Panel

POWER

POWER SIGNAL CLIP SIGNALCLIPPROTECTION

CH A CH B

1 2 3

FILTER

CHANNEL B CHANNEL A

LOW CUT LOW CUT

40Hz

80Hz

OFF

HIGH CUT HIGH CUT

5kHz

10kHz

OFF

INPUT

CHANNEL B CHANNEL A

40Hz

80Hz

5kHz

10kHz

25 30

CHANNEL B CHANNEL A

–dB

OUTPUT VOLTAGE

70V

100V

CHANNEL B CHANNEL A

10 6 3

–dB

INPUT

1 FILTER switches (CHANNEL A,B) 2 Volume controls (CHANNEL A,B) 3 OUTPUT VOLTAGE switch 4 SPEAKERS terminals (CHANNEL A,B) 5 INPUT terminals (CHANNEL A,B) 6 GND terminals

SPEAKERS

CHANNEL B CHANNEL A

XH150

DIMENSIONS

BLOCK DIAGRAM

IC101 IC102 IC104 IC105

132

IC101 IC103 IC104 IC105

132

Unit: mm

PA7

KEC-92353

CIRCUIT BOARD LAYOUT & WIRING

Top View

XH150

Power Transformer

SUB 4/5

SUB 5/5

SUB 2/5

SUB 1/5

PA7

Front View

SUB 4/5

SUB 3/5

Wire color

3NC2-V294100

XH150

DISASSEMBLY PROCEDURE

1. Top Cover

1-1 Remove the nine (9) screws marked [410]. The top

cover can then be removed. (Fig. 1, 2)

2. Power Transformer

2-1 Remove the top cover. (See Procedure 1)

Remove the four (4) screws marked [70]. The power transformer

2-2

can then be removed. (Fig. 1)

3. SUB7 1/5 Circuit Board

3-1 Remove the top cover. (See Procedure 1) 3-2 Remove the six (6) screws marked [80a]. The SUB 1/5

circuit board can then be removed. (Fig. 1)

4. SUB 2/5 Circuit Board

4-1 Remove the top cover. (See Procedure 1) 4-2 Remove the six (6) screws marked [50a] and the two (2)

screws marked [50b]. The SUB 2/5 circuit board can then be removed. (Fig. 2, 7)

[410]

[80a] 6 [410]

[70]: Bind Head Screw SP 5.0X10 MFZN2BL (VU688100) [80]: Bind Head Tapping Screw-B 3.0X8 MFZN2BL (EP600190) [410]: Bind Head Tapping Screw-B 4.0X8 MFZN2BL (EG340190)

1/5

Power Transformer

Top cover

[410]

(Fig. 1) (Fig. 2)

[410]

[70] 4

[410]

[50b]

2/5

[50a] [50a]

[50]: Bind Head Screw A4.0X8 MFZN2BL (VP156800) [410]: Bind Head Tapping Screw-B 4.0X8 MFZN2BL (EG340190)

[410]

Rear panel

5. Panel Assembly

5-1 Remove the top cover. (See Procedure 1) 5-2

Remove the three (3) screws marked [380a] and the two (2) screws marked [380b]. The panel assembly can then be removed. (Fig. 3)

6. SUB 3/5 Circuit Board

6-1 Remove the top cover. (See Procedure 1) 6-2 Remove the panel assembly. (See Procedure 5) 6-3 Remove the two (2) screws marked [200]. The SUB 3/5

circuit board can then be removed. (Fig. 3)

7. SUB 4/5 Circuit Board

7-1 Remove the top cover. (See Procedure 1) 7-2 Remove the panel assembly. (See Procedure 5) 7-3 Remove the two (2) screws marked [220]. The SUB 4/5

circuit board can then be removed. (Fig. 3)

8. DC Fan

8-1 Remove the top cover. (See Procedure 1) 8-2 Remove the panel assembly. (See Procedure 5) 8-3 Remove the four (4) screws marked [150]. The DC fan

can then be removed. (Fig. 3)

XH150

4/5

[380a]

[200] [220] [150]

3/5

[380b] [380b]

[150]: Bind Head Screw 4.0X45 MFZN2BL (VB857700) [200][220]: Bind Head Tapping Screw-B 3.0X8 MFZN2BL (EP600190) [380]: Bind Head Tapping Screw-B 4.0X8 MFZN2BL (EG340190)

9. PA7 Unit

9-1 Remove the top cover. (See Procedure 1) 9-2 Remove the panel assembly. (See Procedure 5) 9-3 Remove the four (4) screws marked [250]. The PA7

unit with the chassis can then be removed. (Fig. 4)

9-4 Remove the eight (8) screws marked [130]. The PA7

unit can then be removed. (Fig. 5)

[250] 4

[150]

(Fig. 3)

Front panel

DC Fan

[130]

[380a]

FAN Angle

[130]

[130] [130]

[250]: Bonding Tapping Screw-B 4.0X8 MFZN2BL (VR779900) [130]: Bind Head Tapping Screw-B 4.0X8 MFZN2BL (EG340190)

(Fig. 4) (Fig. 5)

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