Pioneer GM-X374XR/UC Servise Manual - Page 3

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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
4. PCB CONNECTION DIAGRAM ................................14
4.1 AMP UNIT...........................................................14
5. ELECTRICAL PARTS LIST ........................................18

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, 4 Ω)
Backup current ................................................................................................................................................. 3.0 mA or less
Average current drawn* .......................................................................................................... 6.7 A (4 Ω for four channels)
Fuse .................................................................................................................................................................................. 30 A
Dimensions ........................................................................................................................ 265 (W) × 50 (H) × 237 (D) mm
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 Ω, 20 - 20,000 Hz, 0.08% THD)
Load impedance ............................................................................................................................ 4 Ω (2 - 8 Ω allowable)
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
High pass filter .............................................................................................................................. Cut off frequency: 80 Hz
Maximum input level/impedance .................................................................................... RCA: 6.5 V/22 kΩ (0.2 - 6.5 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.
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6. ADJUSTMENT..........................................................20
7. GENERAL INFORMATION .......................................21
7.1 DIAGNOSIS ........................................................21
7.1.1 DISASSEMBLY .........................................21
7.1.2
7.2 IC ........................................................................23
....8
8. OPERATIONS............................................................24
10.9 A (4 Ω for two channels)
[10-1/2 (W) × 2 (H) × 9-3/8 (D) in]
100 W × 2 (at 14.4 V, 4 Ω, 20 - 20,000 Hz, 0.8% THD)
50 W × 4 (at 14.4 V, 2 Ω, 20 - 20,000 Hz, 0.8% THD)
(Bridge connection: 4 - 8 Ω allowable)
Cut off slope: -12 dB/oct
Cut off slope: -12 dB/oct
Speaker: 26 V/40 kΩ (0.8 - 26 V)
GM-X374/XR/UC
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A
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B
C
D
E
F
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