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XP7000/XP5000
I DISASSEMBLY PROCEDURES
1. Rack Angle (Time required: about 1 min.)
1-1 Remove the three (3) screws marked [470] for each side.
The rack angle can then be removed. (Fig. 1)
2. Top Cover (Time required: about 2 min.)
2-1 Remove the eleven (11) screws marked [530].
The top cover can then be removed. (Fig. 1)
[470] [470]
[530] [345] [345] [530] [530]
[530] [530]
[320] [310] [320]
[310]: Pan Head Screw 2.6X6 MFZN2B3 (WE986400)
[320]: Bonding Tapping Screw-B 3.0X10 MFZN2B3 (WE878000)
[345]: Bind Head Tapping Screw-S 3.0X6 MFZN2B3 (WE877800)
[470]: Bind Head Screw 4.0X10 MFZN2B3 (WE980400)
[530]: Bind Head Screw 4.0X8 MFZN2B3 (WE962000)
(Fig. 1)
3. PA Unit (Time required: about 5 min.)
3-1 Remove the top cover. (See procedure 2.)
3-2 Remove the six (6) screws marked [200] for each side
from the bottom. The PA units can then be removed.
(Fig. 2)
* Flat washers are attached between the main chassis
and PA unit. Take care not to lose flat washers when
removing screw marked [200].
[200] [200]
[200]: Bind Head Screw 4.0X8 MFZN2B3 (WE962000)
(Fig. 2)
16
XP7000/XP5000
4. PS Circuit Board (Time required: about 5 min.)
4-1 Remove the top cover. (See procedure 2.)
4-2 Remove the nine (9) screws marked [230]. The PS cir-
cuit board can then be removed. (Fig. 3)
[230]
[230]: Bind Head Tapping Screw-S 3.0X6 MFZN2W3 (WE877900)
(Fig. 3)
5. IO 1/4 Circuit Board (Time required: about 6 min.)
5-1 Remove the top cover. (See procedure 2.)
5-2 Remove the two (2) screws marked [310], the four (4)
screws marked [320] and the two (2) screws marked
[345]. (Fig. 1)
5-3 Remove the two (2) screws marked [340] to remove the
two hexagonal spacers. (Fig. 4)
5-4 Remove the solder of W302B on the IO 1/4 circuit board,
or W302A on the IO 2/4 circuit board since the IO 1/4
circuit board and the IO 2/4 circuit board are connected
with connector assembly W302. Also remove the solder
of W301A on the IO 1/4 circuit board, or W301B on the
IO 3/4 circuit board since the IO 1/4 circuit board and
the IO 3/4 circuit board are connected with connector
assembly W301. The IO 1/4 circuit board can then be
removed.
* When reinstalling the IO 1/4 circuit board, let the
hooks of the XLR connectors out of the chassis at
first, and inserts the jacks or switches into the holes
on the chassis. (Fig. 5)
* The IO 1/4 circuit board is not available as service
parts individually.
6. IO 2/4 Circuit Board (Time required: about 6 min.)
6-1 Remove the top cover. (See procedure 2.)
6-2 Remove the IO 1/4 circuit board. (See procedure 5.)
6-3 Remove the solder of W302A on the IO 2/4 circuit board,
or W302B on the IO 1/4 circuit board since the IO 2/4
circuit board and the IO 1/4 circuit board are connected
with connector assembly W302. The IO 2/4 circuit board
can then be removed.
* The IO 2/4 circuit board is not available as service
parts individually.
17
XP7000/XP5000
Hexagonal Spacer
Hexagonal Spacer
[340]
[340]
Hooks
[340]: Bind Head Tapping Screw-S 3.0X6 MFZN2W3 (WE877900)
(Fig. 4) (Fig. 5)
7. IO 3/4 Circuit Board (Time required: about 4min.)
7-1 Remove the top cover. (See procedure 2.)
7-2 Remove the two (2) hexagonal locked spacers. (Fig. 6)
7-3 Remove the four (4) screws marked [360]. (Fig. 6)
7-4 Remove the solder of W301B on the IO 3/4 circuit board,
or W301A on the IO 1/4 circuit board since the IO 3/4
circuit board and the IO 1/4 circuit board are connected
with connector assembly W301. Also remove the solder
of W303A on the IO 3/4 circuit board, or W303B on the
IO 4/4 circuit board since the IO 3/4 circuit board and
the IO 4/4 circuit board are connected with connector
assembly W303. The IO 3/4 circuit board can then be
removed.
* The IO 3/4 circuit board is not available as service
parts individually.
8. IO 4/4 Circuit Board (Time required: about 5 min.)
8-1 Remove the top cover. (See procedure 2.)
8-2 Remove the IO 3/4 circuit board. (See procedure 6.)
8-3 Remove the two (2) screws marked [550].
Remove the speaker terminal cover. (Fig. 6)
8-4 Remove the two (2) screws marked [350]. (Fig. 7)
8-5 Remove the solder of W303B on the IO 4/4 circuit board,
or W303A on the IO 3/4 circuit board since the IO 4/4
circuit board and the IO 3/4 circuit board are connected
with connector assembly W303. The IO 4/4 circuit board
can then be removed.
* The IO 4/4 circuit board is not available as service
parts individually.
Hexagonal Locked Spacer Speaker Terminal Cover
[360]
[550]
[360]: Flat Head Tapping Screw-B 3.0X8 MFZN2B3 (WF266800)
[350]
[550]: Bind Head Tapping Screw-S 3.0X6 MFZN2B3 (WE877800) [350]: Bonding Tapping Screw-B 3.0X10 MFZN2B3 (WE878000)
(Fig. 6) (Fig. 7)
18
XP7000/XP5000
9. Front Panel Unit (Time required: about 5 min.)
9-1 Remove the rack angle. (See procedure 1.)
9-2 Remove the top cover. (See procedure 2.)
9-3 Cut cord holder (4 point) of the connector assembly. (Fig.
8)
9-4 Remove the six (6) screws marked [450]. (Fig. 9)
9-5 Draws out the front panel unit.
[450]
[450]
Front Panel side
[450]: Bind Head Screw 4X8 MFZN2B3 (WE962000)
(Fig. 8) (Fig. 9)
10. VR Circuit Board (Time required: about 6 min.)
10-1 Remove the front panel unit. (See procedure 9.)
10-2 Remove the attenuation knobs. (Fig. 10)
10-3 Remove the two (2) hexagonal nuts.
The VR circuit board can then be removed. (Fig. 11)
Attenuation Knob
Hexagonal Nut
(Fig. 10) (Fig. 11)
19
XP7000/XP5000
11. COIL Circuit Board (Time required: about 7 min.)
11-1 Remove the front panel unit. (See procedure 9.)
11-2 Remove the PS circuit board. (See procedure 4.)
11-3 Remove the four (4) screws marked [70].
The COIL circuit board can then be removed. (Fig. 12)
11-4 Remove the four (4) hexagonal nuts.
The four (4) hexagonal spacers can then removed.
(Fig. 13)
* When reinstalling the COIL circuit board, connect the
red wire to PS-CN406 and the black wire to PS-CN415.
Hexagonal Spacer Hexagonal Nut
[70]
COIL Circuit Board
[70]
[70]: Bind Head Tapping Screw-S 3.0X6 MFZN2W3 (WE877900) [70]: Bind Head Tapping Screw-S 3.0X6 MFZN2W3 (WE877900)
(Fig. 12) (Fig. 13)
12. LED Circuit Board (Time required: about 5min.)
12-1 Remove the front panel unit. (See procedure 9.)
12-2 Remove the two (2) screws marked [180].
The LED circuit board can then be removed. (Fig. 14)
[140]
Top
Bottom
[180]
[140]: Bind Head Tapping Screw-S 3.0X6 MFZN2W3 (WE877900)
[180]: Bind Head Tapping Screw-S 3.0X6 MFZN2W3 (WE877900)
(Fig. 14)
20
XP7000/XP5000
13. PSW Circuit Board (Time required: about 10 min.)
13-1 Remove the front panel unit. (See procedure 9.)
13-2 Remove the power switch escutcheon. (Fig. 15)
13-3 Press lightly from the panel back and remove the power
switch knob.
* When it is hard to remove the power switch knob, in-
sert an L-shaped rod into the gap and pull out the
knob as shown the illustration. (Fig. 16) Take care not
to scratch to bruise a panel and a knob at this time.
13-4 Remove the two (2) screws marked [140].
The PSW circuit board can then be removed. (Fig. 14)
* The PSW circuit board can be removed easily if you re-
move the front panel (2) beforehand. (See procedure 15.)
Power Switch Escutcheon
Power Switch Knob
(Fig. 15) (Fig. 16)
14. Handle (Time required: about 6 min.)
14-1 Remove the front panel unit. (See procedure 9.)
14-2 Remove the two (2) screws marked [430] for each side.
The handles can then be removed. (Fig. 17)
* The handle angle is removed simultaneously, at this
time.
Handle Angle Handle Angle
[430]
[430]: Bind Head Screw 5.0X16 MFZN2W3 SP (WG168300)
(Fig. 17)
21
XP7000/XP5000
15. Front Panel (Time required: about 8 min.)
15-1 Remove the front panel unit. (See procedure 9.)
15-2 Remove the handles. (See procedure 14.)
15-3 Remove the eight (8) screws marked [400].
The front panels can then be removed. (Fig. 18)
[400]
Front Panel (1)
Front Panel (2)
[400]: Hex Socket Set Screw-S 3.0X10 MFZN2B3 (WF419400)
(Fig. 18)
16. Fan (Time required: about 12 min.)
16-1 Remove the front panel unit. (See procedure 9.)
16-2 Remove the PA unit located on the same side as the fan
to remove. (See procedure 3.)
16-3 Remove the two (2) screws marked [40] and the two (2)
hexagonal nuts for each side. Fans can then be removed.
(Fig. 19)
[40]
Hexagonal Nut
Hexagonal Nut
[40]
[40]: Bind Head Screw 4.0X16 MFZN2W3 SP (WE984000)
(Fig. 19)
22
XP7000/XP5000
I IC BLOCK DIAGRAM
· NJM2068MD-TE2 (X3505A00)
Dual Operational Amplifier
XP7000 SUB: IC301, IC302, IC303, IC304, IC305
PAH: IC201
XP5000 SUB: IC301, IC302, IC303, IC304, IC305
PAH: IC201
+DC Voltage
Output A 1 +V 8
Supply
Inverting
2 7 Output B
Input A - +
Non-Inverting Inverting
3 6
Input A + - Input B
-DC Voltage Supply 4 -V 5 Non-Inverting
Input B
· IR2110 (X2382A00)
Driver
XP7000 PS: IC402
XP5000 PS: IC402
6 VB
HV
LEVEL UV
LO 1 14 VDD 9 SHIFT DETECT R Q
PULSE R 7 HO
R Q
COM 2 13 VSS S FILTER S
VDD/VCC
HIN 10 LEVEL
VCC 3 12 LIN SHIFT PULSE 5 VS
GEN
4 11 SD 3
SD 11 VCC
VS 5 10 HIN UV
DETECT
VDD/VCC
VB 6 9 VDD LIN 12 LEVEL 1 LO
S SHIFT
R Q DELAY
HO 7 8
VSS 13 2 COM
· SG3525AN (X2383A00)
Regulating Pulse Width Modulator
XP7000 PS: IC401
XP5000 PS: IC401
REFERENCE
VREF 16 REGULATOR 15 +VIN
FLIP/
OSC. OUTPUT 4 FLOP
INV. INPUTN 1 16 V REF
13 VC
N.I. INPUT 2 15 +VIN SYNC 3
OSCILLATOR
RT 6 A 11 OUTPUT A
SYNC 3 14 OUTPUT B
DISCHARGE 7
OSC. OUTPUT 4 13 VC
CT 5 B 14 OUTPUT B
CT 5 12 GROUND
12 GROUND
RT 6 11 OUTPUT A COMPENSATION 9 PWM A
50
8 SOFT-START
DISCHARGE 7 10 SHUTDOWN INV. INPUTN 5K 5K
1
E/A
N.I. INPUT 10 SHUTDOWN
8 9 2
SOFT-START COMPENSATION
23
XP7000/XP5000
I CIRCUIT BOARDS
CONTENTS
· COIL Circuit Board (X6755B0) ............................................................. 24
· LED Circuit Board (X6754D0) ............................................................ 25
· PAH Circuit Board (X6750B0) ............................................................. 26
· PS Circuit Board (X6752C0) ............................................................ 28
· IO 1/4 Circuit Board (X6754D0) ............................................................ 32
· IO 2/4 Circuit Board (X6754D0) ............................................................ 33
· IO 3/4 Circuit Board (X6754D0) ............................................................ 33
· IO 4/4 Circuit Board (X6754D0) ............................................................ 34
· PSW Circuit Board (X6754D0) ............................................................ 35
· VR Circuit Board (X6754D0) ............................................................ 35
· COIL Circuit Board
H/B/K/O destinations
to PS-CN406 to PS-CN415
Component side
L701, L702
Cord holder
Put cord holder through the holes of circuit board.
Pattern side
Component side
Pattern side
2NA-WF40160 1 (XP7000)
24 2NA-WF40160 1 (XP5000)
XP7000/XP5000
· LED Circuit Board
CLIP
SIGNAL
to PS-CN410
TEMP
PROTECTION
POWER/STANDBY
Component side Pattern side
2NA-WF39910 3 (XP7000)
2NA-WF39910 3 (XP5000) 25
XP7000/XP5000
· PAH Circuit Board
to PS-CN412 (Ach)
to PS-CN411 (Bch) to IO 3/4-W304 (Ach) A
to IO 1/4-CN302 (Ach, Bch) to IO 3/4-W306 (Bch)
Component side
A'
B
Pattern side
B'
2NA-WF39660 1 (XP7000)
26 2NA-WF39660 1 (XP5000)
XP7000/XP5000
to PS-W401 (Ach)
to PS-W406 (Bch)
to PS-W402 (Ach)
to PS-W407 (Bch) Following semi-conductors are
A to PS-W403 (Ach) installed for the PA unit.
to PS-W408 (Bch)
Ref. XP7000 XP5000
D124 O O
D125 O O
D126 O O
D127 O O
Q112 O O
-115 O O
Q116 O O
Q117 O O
Q135 O O
Q136 O O
Q218 O O
Q118N O O
Q118P O O
Q119N O O
Q119P O O
Q120N O O
Q120P O O
Q121N O O
Q121P O O
Q122N O O
Q122P O O
Q123N O
Q123P O
Component side Q125N O O
A' Q125P O O
Q126N O O
B Q126P O O
PR201 O O
PR202 O O
O :Installed
:Not installed
Pattern side
B'
2NA-WF39660 1 (XP7000)
2NA-WF39660 1 (XP5000) 27
XP7000/XP5000
· PS Circuit Board
TEMP LED TEST POINT A
to IO 3/4-CN304
to LED-W310
to FAN (Ach)
to PAH-CN201 (Ach)
to PAH-CN201 (Bch)
to IO 1/4-CN302
to FAN (Bch) to PAH-CN104 (Bch) to PAH-CN105 (Bch)
FAN TEST POINT to PAH-CN103 (Bch) to PAH-CN105 (Ach) A'
to PAH-CN103 (Ach) to IO 3/4-W305
to PAH-CN104 (Ach)
Component side
2NA-WF39710 2 (XP7000)
28 2NA-WF39710 2 (XP5000)
XP7000/XP5000
to PSW-W307 * J/H/B/K/O destinations only.
A to PSW-W309 to COIL-W701 *
to PSW-W308 to COIL-W702 *
to AC IN
to AC IN
A'
Component side
2NA-WF39710 2 (XP7000)
2NA-WF39710 2 (XP5000) 29
XP7000/XP5000
B
B'
Pattern side
2NA-WF39710 2 (XP7000)
30 2NA-WF39710 2 (XP5000)
XP7000/XP5000
B
B'
Pattern side
2NA-WF39710 2 (XP7000)
2NA-WF39710 2 (XP5000) 31
XP7000/XP5000
· IO 1/4 Circuit Board
HPF HPF
OFF 20Hz 55Hz OFF 20Hz 55Hz
GAIN
+4dBu 26dB
32dB
MODE
to VR-CN303 BRIDGE
STEREO PARALLEL
to PAH-CN202 (Ach, Bch)
to PS-CN408
to IO 3/4-W301B
to IO 2/4-W302A
INPUT
B A
Component side
Pattern side
2NA-WF39910 3 (XP7000)
32 2NA-WF39910 3 (XP5000)
XP7000/XP5000
· IO 2/4 Circuit Board
to IO 1/4-W302B
G G
INPUT
Component side Pattern side
2NA-WF39910 3 (XP7000)
2NA-WF39910 3 (XP5000)
· IO 3/4 Circuit Board
to PS-CN416
to PAH-CN102 (Bch)
to IO 4/4-W303B
to IO 1/4-W301A
to PAH-CN102 (Ach)
to PS-CN501
MONITOR/
2 2
REMOTE
SPEAKERS
Component side
Pattern side
2NA-WF39910 3 (XP7000)
2NA-WF39910 3 (XP5000) 33
XP7000/XP5000
· IO 4/4 Circuit Board
BRIDGE
B A
1 1
to IO 3/4-W303A
Component side
Pattern side
2NA-WF39910 3 (XP7000)
34 2NA-WF39910 3 (XP5000)
XP7000/XP5000
· PSW Circuit Board
POWER
ON/OFF
to PS-CN405
to PS-CN403
to PS-CN404
Component side Pattern side
2NA-WF39910 3 (XP7000)
2NA-WF39910 3 (XP5000)
· VR Circuit Board
A B
to IO 1/4-CN301
2NA-WF39910 3 (XP7000)
2NA-WF39910 3 (XP5000) 35
XP7000/XP5000
I INSPECTIONS
1. Applicable range
· Applicable to the power amplifiers XP7000/XP5000.
* For the details of adjustment points, refer to "Switches and Adjustment Points" (p. 41).
2. Preparation for STEREO/PARALLEL mode
Attenuator : "0" (MAX) (both channels)
Input terminal : XLR connector 2PIN-HOT/3PIN-COLD/1PIN-GND
MODE switch : STEREO
GAIN switch : 32 dB
HPF switch : OFF (both channels)
Load resistance : 8 ohms +/- 1%
· Unless otherwise specified, use above settings for all inspection items of the STEREO/PARALLEL mode. When any setting
has been changed, be sure to reset it back to the above setting before testing other items.
· Unless otherwise specified, use a high grade sine wave for the input signal.
· Unless otherwise specified, keep both channels in the drive mode.
· The unit used for analog I/O level is 0 dBu=0.775 Vrms.
3. Inspection and Adjustment
3.1 Power ON muting time and POWER LED, PROTECTION LED
Turn on the power and check that POWER and PROTECTION LEDs light up.
Turn on the power and check that PROTECTION LED turns off in 2.5 ± 1 seconds.
3.2 Fan and TEMP LED
Short-circuit 2 jumper cables within the "FAN-C" marked frame on the PS circuit board and check that the fan runs. Also short-
circuit 2 jumper cables within the "TM-C" marked frame and check that TEMP LED lights up.
3.3 Idling current
Ground the input terminal and adjust VR201 so that the DC voltage Vb between the pins 1 and 2 of CN101 on the PA unit
becomes 0.275 ± 0.025 mV. After all inspections, adjust the Vb again so that it becomes 0.5 ± 0.1 mV. Perform this adjustment
on both channels.
3.4 DC voltage of output terminal
Ground the input terminal and measure the DC voltage Vdc at the output terminal. Check that the measured value is 0 ± 75
mV.
3.5 Gain
3.5.1 Nominal gain
Input a 1 kHz, -10.0 dBu sine wave signal to the input terminal and check that +22.0 ± 0.5 dBu output voltage is obtained.
3.5.2 GAIN switch
Set the GAIN switch to 26 dB.
Input a 1 kHz, -10.0 dBu sine wave signal to the input terminal and check that +16.0 ± 0.5 dBu output voltage is obtained.
Next, set the GAIN switch to +4 dBu.
Input a 1 kHz, -10.0 dBu sine wave signal to the input terminal and check that the output voltage obtained is as specified in the
table below.
XP7000 XP5000
+25.7 +/- 0.5 dBu +24.2 +/- 0.5 dBu
36
XP7000/XP5000
3.5.3 Attenuator
With the attenuator set to the -10 dB position, input a 1 kHz, -10.0 dBu sine wave signal to the input terminal and check that an
output voltage within +12.0 ± 3.0 dBu is obtained.
3.5.4 PARALLEL mode
Set the MODE switch to PARALLEL.
Input a 1 kHz, -10.0 dBu sine wave signal to the input terminal of the A channel and check that +22.0 ± 0.5 dBu output voltage
is obtained for both channels.
Do not input any signal to the input terminal of the B channel.
3.6 Frequency characteristics
Input 20 Hz, 1 kHz, 20 kHz, -10 dBu signals and check that the output voltage obtained is within -0.5 ± 0.5 dBu at 20 Hz and
20 kHz as compared with the output voltage at 1 kHz.
Input a 20 Hz, -10 dBu signal and check that the output voltage is within -3.0 ± 2.0 dBu as compared with the output voltage
at 1 kHz, -10 dBu in the HPF OFF state.
Input a 55 Hz, -10 dBu signal and check that the output voltage is within -3.0 ± 2.0 dBu as compared with the output voltage
at 1 kHz, -10 dBu in the HPF OFF state.
3.7 Distortion
Input 20 Hz, 20 kHz signals to the input terminal and check that the distortion is 0.1% or less when the rated output as
specified in the table below is obtained.
This inspection should be completed within 30 seconds.
XP7000 (U/T/A) XP7000 (H/B/K/O) XP5000
74.82 V 72.12 V 63.25 V
(700 W + 700 W) (650 W + 650 W) (500 W + 500 W)
3.8 Channel separation
Input a 1 kHz signal to the A channel and shunt 2 pin (hot) and 3 pin (cold) of input terminals of the B channel with 600 ohms.
Set the output of the A channel as specified in "Output level of the channel with signal input" section in the table below.
Check that the output voltage of the B channel is less than the value specified in "Output level of the channel terminated"
section in the table below. Reverse A and B channels and perform the same check.
Use a DIN AUDIO filter for this measurement.
XP7000 XP5000
Output level of the channel 36.7 dBu 35.3 dBu
with signal input (350 W) (250 W)
Output level of the channel
-33.3 dBu -34.7 dBu
terminated
3.9 Output noise level
Shunt 2 pin (hot) and 3 pin (cold) of input terminals with 600 ohms.
Measure the noise level at the output terminal and check that it is -65 dBu or less.
Set the attenuator to MIN and check that the noise level is -70 dBu or less.
Use a DIN AUDIO filter for this measurement.
37
XP7000/XP5000
3.10 Stability
Use only the polyester film capacitor of net capacity of 0.01 uF as a load.
Input the 1 kHz, -10 dBu rectangular square wave and check that no oscillation occurs and following conditions are satisfied.
Overshoot : Vp/Vo<2.5
Ringing : Converged within 7 waves and no oscillation generated
Vp
Vo
··· Ringing Waves
3.11 Protection circuit
Disconnect the load resistance from the output terminal.
Short-circuit 2 jumper cables within the "DC-C" marked frame of the PS circuit board and check that the power is shut down
within 2 seconds.
After checking, make short-circuited jumper cables off. Turn off the power and turn it on again 3 seconds later to check that the
unit can be restarted normally.
3.12 Efficiency
(1) Input a 1 kHz, -6.6 dBu signal and measure the primary power.
Check that the measured value is within the range specified in the table below.
(2) Shunt 2 pin (hot) and 3 pin (cold) of input terminals with 600 ohms and measure the primary power. Check that the
measured value is within the range specified in the table below.
3.13 VI limiter and comp.
Connect 1 ohms (± 5%) load to the output terminal and input a 1 kHz, -1.5 dBu signal. Check that the output voltage is within
the range specified in the table below. Also check that the distortion is 5% or less and the CLIP LED lights up.
Perform this inspection on each channel separately.
This inspection should be completed within 30 seconds.
3.14 SIGNAL LED
Input a 1 kHz, -23 dBu sine wave signal and check that the SIGNAL LED lights up. Perform this inspection on each channel
separately.
38
XP7000/XP5000
3.15 MONITOR/REMOTE
3.15.1 Preparation
Connect the inspection circuit to the MONITOR/REMOTE terminal (JK304).
Check that the tolerance of the connected resistor is 1% or less, the rated power is 1/4 W or more and the tolerance of the DC
current voltage is 1% or less.
15 pin
7.5 k-ohms
14 pin
7.5 k-ohms
13 pin
12 pin
MONITOR/REMOTE terminal JK304
11 pin
180 ohms
10 pin
180 ohms
9 pin
8 pin
7 pin
SW1
6 pin
SW2
5 pin
4 pin
3 pin
5V 1.5 k-ohms SW3
2 pin
330 ohms SW4
1 pin
3.15.2 Output level
Input a 1 kHz, -10 dBu signal and check that the output voltage at pins 14 and 15 of JK304 is 4.8 ± 1.0 dBu.
3.15.3 Mute and protection status
Input a 1 kHz, -10 dBu signal.
Check that the DC voltage at pins 10 and 11 of JK304 is +2 ± 0.5V .
Turn on SW1 and check that the DC voltage at pin 11 of JK304 is 0.5 V or less and the voltage level at the output terminal of
the A channel is -30 dBu or lower.
Turn on SW2 and check that the DC voltage at pin 10 of JK304 is 0.5 V or less and the voltage level at the output terminal of
the B channels is -30 dBu or lower.
3.15.4 Model ID
Turn on SW3 and check that the DC output voltage at pin 3 of JK951 is within the range for "ID-V" specified in the table below.
3.15.5 Standby
Turn on SW4 and check that the POWER LED lights up in orange and the primary power is 5W or less.
39
XP7000/XP5000
4. Preparation for BRIDGE mode
Attenuator : "0" (MAX) Only channel A is valid.
Input terminal : XLR connector 2PIN-HOT/3PIN-COLD/1PIN-GND
MODE switch : BRIDGE
GAIN switch : 32 dB
HPF switch : OFF (both channels)
Load resistance : 8 + 8 ohms +/- 1%
Make connections as shown below and measure the output voltage at each point.
A+ INPUT+
8 ohms R
XP7000 MEASURING
or INSTRUMENT
XP5000
8 ohms R
B+ INPUT-
5. Inspection
5.1 Gain
Input a 1 kHz, -10.0 dBu signal and check that +28.0 ± 1.0 dBu output voltage is obtained.
5.2 Frequency characteristics
Input 20 Hz, 1 kHz, 20 kHz, -10 dBu signals and check that the output voltage obtained is within -0.5 ± 0.5 dBu at 20 Hz and
20 kHz as compared with the output voltage at 1 kHz.
5.3 Distortion
Input 20 Hz, 20 kHz signals to the input terminal and check that the distortion is 0.1% or less when the output voltage as
specified in the table below is obtained.
This inspection should be completed within 30 seconds.
5.4 Output noise level
Shunt 2 pin (hot) and 3 pin (cold) of input terminals with 600 ohms.
Measure the noise level at the output terminal and check that it is -60 dBu or less.
Next, set the attenuator to MIN and check that the noise level is -65 dBu or less.
Use a DIN AUDIO filter for this measurement.
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