Pioneer gmx 374 service manual
This is the 25 pages manual for pioneer gmx 374 service manual.
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Extracted text from pioneer gmx 374 service manual (Ocr-read)
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2 1 234 1234 F E D CB A GM-X374/XR/UC [ Important symbols for good services ]In this manual, the symbols shown-below indicate that adjustments, settings or cleaning should be made securely. When you find the procedures bearing any of the symbols, be sure to fulfill them: 2. Adjustments To keep the original performances of the product, optimum adjustments or specification confirmation is indispensable. In accordance with the procedures or instructions described in this manual, adjustments should be performed. 3. Cleaning For optical pickups, tape-deck heads, lenses and mirrors used in projection monitors, and other parts requiring cleaning, proper cleaning should be performed to restore their performances. 5. Lubricants, glues, and replacement parts Appropriately applying grease or glue can maintain the product performances. But improper lubrication or applying glue may lead to failures or troubles in the product. By following the instructions in this manual, be sure to apply the prescribed grease or glue to proper portions by the appropriate amount.For replacement parts or tools, the prescribed ones should be used. 4. Shipping mode and shipping screws To protect the product from damages or failures that may be caused during transit, the shipping mode should be set or the shipping screws should be installed before shipping out in accordance with this manual, if necessary. 1. Product safety You should conform to the regulations governing the product (safety, radio and noise, and other regulations), and should keep the safety during servicing by following the safety instructions described in this manual. CAUTION This service manual is intended for qualified service technicians; it is not meant for the casual do-it-yourselfer. Qualified technicians have the necessary test equipment and tools, and have been trained to properly and safely repair complex products such as those covered by this manual. Improperly performed repairs can adversely affect the safety and reliability of the product and may void the warranty. If you are not qualified to perform the repair of this product properly and safely, you should not risk trying to do so and refer the repair to a qualified service technician. W ARNING This product contains lead in solder and certain electrical parts contain chemicals which are known to the state of California to cause cancer, birth defects or other reproductive harm. Health & Safety Code Section 25249.6 - Proposition 65 SAFETY INFORMATION -GM-X374/XR/UC
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3 56 78 F E D CB A 56 78 GM-X374/XR/UC 1. SPECIFICATIONS Power source .............................................................................................................. 14.4 V DC (10.8 - 15.1 V allowable) Grounding system ................................................................................................................................ ............ Negative type Current consumption ........................................................................................................ 19.2 A (at continuous power, 4W) Average current drawn* .......................................................................................................... 6.7 A (4 Wfor four channels) 10.9 A (4 Wfor two channels) Fuse ................................................................................................................................ .................................................. 30 A Dimensions ........................................................................................................................ 265 (W) ´50 (H) ´237 (D) mm [10-1/2 (W) ´2 (H) ´9-3/8 (D) in] Weight ........................................................................................................ 2.8 kg (6.2 lbs) (Leads for wiring not included) Maximum power output ...................................................................................................................... 70 W´4 / 200 W´2 Continuous power output .......................................................... 35 W´4 (at 14.4 V, 4 W, 20 - 20,000 Hz, 0.08% THD) 100 W´2 (at 14.4 V, 4 W, 20 - 20,000 Hz, 0.8% THD) 50 W´4 (at 14.4 V, 2 W, 20 - 20,000 Hz, 0.8% THD) Load impedance ............................................................................................................................ 4 W(2 - 8 Wallowable) (Bridge connection: 4 - 8 Wallowable) Frequency response ............................................................................................................10 - 45,000 Hz (+0 dB, –1 dB) Signal-to-noise ratio ...................................................................................................................... 100 dB (IHF–A network) Distortion ................................................................................................................................ ............ 0.008% (10 W, 1 kHz) Separation ................................................................................................................................ ........................ 65 dB (1 kHz) Low pass filter ................................................................................................................................ Cut off frequency: 80 Hz Cut off slope: –12 dB/oct High pass filter .............................................................................................................................. Cut off frequency: 80 Hz Cut off slope: –12 dB/oct Maximum input level/impedance .................................................................................... RCA: 6.5 V/22 kW(0.2 - 6.5 V) Speaker: 26 V/40 kW(0.8 - 26 V) Note:- Specifications and the design are subject to possible modification without notice due to improvements. *Average current drawn- The average current drawn is nearly the maximum current drawn by this unit when an audio signal is input. Use this value when working out total current drawn by multiple power amplifiers. Backup current ................................................................................................................................................. 3.0 mA or less CONTENTS SAFETY INFORMATION ............................................2 1. SPECIFICATIONS........................................................3 2. EXPLODED VIEWS AND PARTS LIST .......................4 2.1 PACKING ...............................................................4 2.2 EXTERIOR .............................................................6 3. SCHEMATIC DIAGRAM .............................................8 3.1 OVERALL CONNECTION DIAGRAM(GUIDE PAGE) ....8 4. PCB CONNECTION DIAGRAM ................................14 4.1 AMP UNIT ...........................................................14 5. ELECTRICAL PARTS LIST ........................................186. ADJUSTMENT..........................................................20 7. GENERAL INFORMATION .......................................21 7.1 DIAGNOSIS ........................................................21 7.1.1 DISASSEMBLY .........................................21 7.1.2 CONNECTOR FUNCTION DESCRIPTION .......22 7.2 IC ........................................................................23 8. OPERATIONS............................................................24