Kenwood KAC-PS4D/X4R User manual

© 2007-4 PRINTED IN JAPAN
B53-0520-00 (N)426
KAC-PS4D
KAC-X4R
KAC-PS4D
KAC-X4R
Dressing Panel
(A21-6578-01) : KAC-X4R
(A21-6579-01) : KAC-PS4D
Screw & Wrench Key set
(N99-1795-05)
Fuse (25A)
(F52-0014-05)
Compact disc
(W01-1701-05)
KAC-PS4D/X4R
POWER AMPLIFIER
SERVICE MANUAL
This product uses Lead Free solder.
This product complies with the RoHS directive for the European market.

2
KAC-PS4D/X4R
BLOCK DIAGRAM
ISO ARCA IN AL VR AMP SE to DIF
ADC Ach
SE to DIFISO A AMPVR
SE to DIF
SE to DIF
ISO A
ISO A
AMP
AMP
VR
VR
ADC Bch
RCA IN AR
RCA IN BR
RCA IN BL
DSP
IC1IC307
15V 15V 15V 5V,3.3V
DRIVER PWR FET FILTER
DRIVER PWR FET FILTER
DRIVER
DRIVER
PWR FET
PWR FET
FILTER
FILTER
FEEDBACK, DPSC, ADCS
OVERCURRENT DETECTION
SP OUT AL
SP OUT AR
SP OUT BL
SP OUT BR
HV, 15V
12V,5V,3.3V,1.8V
L/R
DAC
12V REG
E2PROM
CURRENT
DETECTOR
DETECTOR-1
VOLTAGE
TEMPERATURE
DETECTOR
DETECTOR
OUTPUT DC
5V-3V
INTERFACE
RCA OUT
L/R
ROTARY
ENCODER
DETECTOR
PCON
RESET IC
REG
3.3V SW
P/S FDFWD
DAC
ADC
DSP
USB
ANTI PUMP
FEED BACK
SPDIF
REG
1.8V SW
DSP
A5V REG
D5V REG
DAC
ADC
P/S FDFWD
FEED BACK
SPDIF
ANTI PUMP
FINAL
FINAL
FEED BACK
ANTI PUMP
+HV REG
HV REG
CONTROL
PWM
LC
FILTER
FUSE
GND
BATT14.4V
REG
BU5V
SWITCH
SLIDE
FL
DRIVER FL
P/S FDFWD
FEED BACK
SE to DIF
ISO AMP
FINAL
ANTI PUMP
MICRO
VOLTAGE
DETECTOR-2 COMPUTER
MICRO
REG
+14.5V SW
5V, 3.3V
IC900
15V REG
IC310
IC511
IC510
IC503
IC500
IC512
IC705
Q911
IC101,102,201,202
ON/OFF CONTROL
TRANSFORMER*2

3
KAC-PS4D/X4R
COMPONENTS DESCRIPTION
●PREAMPLIFIER UNIT (X08-4350-10)
Ref. No. Application / Function Operation / Condition / Compatibility
IC1 AR/BRch 8dB buffer-amp
IC2 AL/BLch 8dB buffer-amp
IC100 FL driver and Key Matrix Communicate with microcomputer (on X09 unit).
●AUDIO UNIT (X09-8620-10)
Ref. No. Application / Function Operation / Condition / Compatibility
IC1 DSP (digital amplifier processor)
IC3 reset detect 3.3V VDD for DSP etc
IC100,200,604 buffer
IC101,102,201,202 MOS FET driver
IC301,302,401,402 Isolation amp to reduce common mode noise
IC303,304,403,404 Amp for differential input of AD converter
IC306 Buffer amp for common voltage of AD converter
IC307 4ch AD converter for analog input
IC309 Low pass filter for Line out
IC310 DAC for pre-out
IC500 Error Amp for +/-16V regulator
IC502 SW power supply control IC
IC503 12V voltage regulator
IC507 buffer for sync clk
IC509 14.5V SW regulator
IC510,511 dcdc converter for 3.3V and 1.8V
IC512 5V voltage regulator
IC601 Amp for differential input of AD converter
IC602 Buffer amp for common voltage of AD converter
IC603,704,804 AD Converter for feedback
IC605 FET driver for (Q601,602) (Anti-pump circuit)
IC701,702,801,802 Amp for differential input of AD converter
IC703 Buffer amp for common voltage of AD converter
IC705 5V voltage regulator
IC900 system micro
IC901 control line 3.3V ↔ 5V translation buffer
IC902 E2PROM for installer memory, error log.
IC904 Amp for sensing GND voltage
Q101~104,201~204 SW transistor for SP output line
Q105~108,205~208 Current protection detect
Q109,110,209,210 on/off SW of N_HB_ERR (SP out over current det.)
Q111,112,114,115,
Q211,212,214,215 Speaker mute TR

4
KAC-PS4D/X4R
COMPONENTS DESCRIPTION
Pin No. Application / Function Operation / Condition / Compatibility
Q113,116,213,216 SP Mute driver
Q301,401 Mute circuit of Line out
Q302 Mete driver of Line out
Q303 AND circuit of SW5V & Preout Mute
Q503~508 Driver of SW power supply
Q509~516 SW transistor for SW regulator
Q517 AVR of +16V
Q520 AVR of -16V
Q521~523 AVR on/off control (1.8V → 3.3V on)
Q524 Interception circuit of VFL
Q525 Secondarily stage of Darlington AVR of VFL and FIL+
Q526 primary stage of Darlington AVR of VFL and FIL+
Q527~529 Secondarily stage of Darlington AVR of FIL+
Q530 primary stage of Darlington AVR of FIL+
Q531 Interception circuit of VFL
Q533 fixed current supply of +/-16V
Q601,602 SW transistor for Anti-pump circuit
Q603,604 current detect for Anti-Pump circuit
Q605 on/off SW of N_PSCURR (Anti-pump over current det.)
Q901 On/off SW of SW5V
Q902 Logo LED driver
Q903 inverter of +40V detect circuit
Q904 Interception circuit of B14V
Q905 On/off SW of Q904
Q906,907 SP DC detect circuit
Q908 Interception circuit of SW5V
Q909 Protect circuit for Vdd5V
Q910 NF control for Vdd5V
Q911 Interception circuit of BU5V
Q912 On/off SW of SW14V
Q913 Interception circuit of SW14V
Q914,915 P-con detector
Q916 BATT14V down detector
Q917 Inverter of FAN CTRL line from µ-con
Q918 On/off SW of FAN+B
Q920 Secondarily stage of Darlington AVR of FAN+B
Q922,923 On/off SW of SP MUTE
Q924 Inverter of OUT_OF_BOOT line

5
KAC-PS4D/X4R
MICROCOMPUTER’S TERMINAL DESCRIPTION
● SYSTEM µ-COM 78F0536GK011A (X09-862 : IC900)
Pin No. Pin Name I/O Application Processing / Operation / Description
1 /P_CON I Clear the stop mode by P-CON ON L: Clear the stop mode (INTP0)
H: (P120)
2~5 NC O Not used Output L fixed
6 /RESET I Reset
7 OVF I ADC overflow detection H: When the overflow is detected displays on VFD
8 NC O Not used Output L fixed
9 FLASH_W I Used when writing in the flash
10,11 NC O Not used Output L fixed
12 REGC -
13 VSS - Connect to GND
14 EVSS - Connect to GND
15 VDD - Connect to VDD
16 EVDD - Connect to VDD
17 D2_CLK I/O D2 control (75kHz max) I2C BUS
18 D2_DATA I/O D2 control I2C BUS
19 /N-ERROR I Over current detection
L: Enter the protection mode when the over current is
detected. Turn off the amplifier power supply and display the
error (E-03).
Automatically recover in 200msec.
20 NC O Not used Output L fixed
21 /OC_DET I Over current detection
Check current every 1ms, and when “L” is detected 15 times
in succession the over current is detected and enter the over
current protection mode. Turn off the amplifier power supply
and display the error (E-03).
Automatically recover in 200msec.
22 /D2_RESET O Reset TENZING L=RESET
23 /D2_RST_DET I Tenzing reset detection
When Low is detected at pin23 while the pin22 of the µ-com
is High,temporarily turn off the amplifier and reboot the
system.
24,25 NC O Not used Output L fixed
26 /PREOUT_MUTE O Mute the pre-out L: MUTE ON
27 /DSP_MUTE O Mute TENZING L: MUTE ON
28~30 NC O Not used Output L fixed
31 /SP_MUTE O Mute the speaker output L: MUTE ON
32 OUT_OF_BOOT I Receive BOOT completion status from
TENZING L: Tenzing BOOT completion (DSP is in its operation)
33 BOOT_CTRL (Not Used) I DSP BOOT control
(No µ-com control)
L: BOOT from µ-com
H: BOOT from EEPROM
34 ROTARY_CW I Encoder pulse input Detect pulse phase difference
35 ROTARY_CCW I Encoder pulse input Detect pulse phase difference
36 14V_SW O SW14V ON/OFF SW14V ON/OFF
Amplifier power supply ON: H, Initial condition L

6
KAC-PS4D/X4R
Pin No. Pin Name I/O Application Processing / Operation / Description
37 5V_SW O SW5V ON/OFF SW5V ON/OFF
Power supply ON: H, Initial condition L
38 VD DOWN I Detection of voltage at momentary
power down
H: Processing to detect voltage at momentary power down
(Enter the stop mode when the P-CON is down.)
39 FAN_CTRL O FAN control H: FAN_ON
40 PON_ILLUM O LOGO LED+B SW H: ON, L: OFF, Initial condition L
41 PON_FL O FL power supply (Grid and Filament)
control H: ON, L: OFF
42 /VFD_INH (/BLK) O Inhibit FL driver display H: Display, L: No display
43 VFD_CE O
44 VFD_DATA_M (FVD.DI) O
45 VFD_DATA_S (FVD.DO) I
46 VFD_CLK O
47 AVREF - DA REF voltage
48 AVSS -
49 AD_V I Detects BU voltage (For display) Displays the voltage and condition.
50 AD_I I Detects primary current (For display) Converts into the current and displays current value.
51 TEMP6 I Temperature detection 6 (at power
supply side) (For display and protection) Displays the temperature and overheat protection.
52 TEMP5 I Temperature detection 5 (at power
supply side) (For display and protection) Displays the temperature and overheat protection.
53 TEMP4 I Temperature detection 4 (at power
supply side) (For display and protection) Displays the temperature and overheat protection.
54 TEMP3 I Temperature detection 3(at power
supply side) (For display and protection) Displays the temperature and overheat protection.
55 TEMP2 I Temperature detection 2 (at power
supply side) (For display and protection) Displays the temperature and overheat protection.
56 TEMP1 I Temperature detection 1 (at power
supply side) (For display and protection) Displays the temperature and overheat protection.
57 NC O Not used Output L fixed
58 E2P_SCL I/O To memorize D2 setting
59 E2P_SDA I/O To memorize D2 setting
60,61 NC O Not used Output L fixed
62 B_DET I B voltage over voltage detection
(Not Used)
Plan: Enters the protection operation when the voltage is
higher than a certain value.
(Not Used)
• Software does not have a detection function.
• Make sure to pull down/up when it is required to remove
the external circuit!
63 /DC_DET I Output DC OFFSET voltage detection L: Enters into the voltage error protection operations.
64 USB_DET (Not Used) I USB detection
H: When USB is detected, do not make D2 setup from the
µ-com.
• No processing is included.
MICROCOMPUTER’S TERMINAL DESCRIPTION

7
KAC-PS4D/X4R
TEST MODE
●
How to enter the test mode and how to clear the test mode
• How to enter
In the backup connection condition (when the battery is
being connected), turn ON the P_CON while keep pushing
the rotary push key.
* Set up SETTING SW from the INFORMATION side.
• How to clear
P_CON OFF or reset to clear the mode.
* Do not clear the mode if the protection recovers auto-
matically.
●Items in the test mode and test operations
• INFORMATION display (Display of conditions)
In the test mode, the following items can be checked in
addition to the normal INFORMATION display.
Each item can be selected with the rotary encoder and the
settings can be changed with the push key.
OVER
Hz dB
o
DIRG
OVER
Hz dB
o
Initial condition
OVER
Hz dB
o
....
OVER
Hz dB
o
OVER
Hz dB
o
OVER
Hz dB
o
OVER
Hz dB
o
/TWSC
OVER
Hz dB
o
TS
OVER
Hz dB
o
OVER
Hz dB
o
OVER
Hz dB
o
Tu r n
Push
Tu r n
Tu r n
OVER
Hz dB
o
FFO
FFO
OVER
Hz dB
o
NO
NO
Tu r n
OVER
Hz dB
o
OVER
Hz dB
o
OVER
Hz dB
o
003.V
721.F
OVER
Hz dB
o
V34.1
OVER
Hz dB
o
A81
OVER
Hz dB
o
C87
Tu r n
Tu r n
OVER
Hz dB
o
NAF
S-LEP
Push
OVER
Hz dB
o
Push
OVER
Hz dB
o
DEL
Push
OVER
Hz dB
o
W/F
OVER
Hz dB
o
REV
OVER
Hz dB
o
TLOV
OVER
Hz dB
o
RTRUC
OVER
Hz dB
o
PMET
OVER
Hz dB
o
OMED
..
..
Additional items shown in the test mode
Condition display Items shown
in the normal mode
●Segment check of FL display tube
Change the display segment in the following sequence of order.
All on mGRID1 on mGRID2 on mGRID3 on mAll of
●Check of FAN switching
In the FAN switching mode, it is possible to select to rotate or stop the FAN regardless of
the present temperature.
L-GOE
OVER
Hz dB
o
Push
OVER
Hz dB
o
OVER
Hz dB
o
KOCL
GNCL
CL-M
OVER
Hz dB
o
Push
●Check of LED switching
In the LED switching mode, it is possible to select to turn on or off the LED.
●Version display
It is possible to check the version of the M-com.
C9999
P9999
OVER
Hz dB
o
OVER
Hz dB
o
T9999
D9999
OVER
Hz dB
o
O9999
OVER
Hz dB
o
OVER
Hz dB
o
N9999
S9999
R
●PRE-OUT setting
Set up PRE-OUT output to be CENTER-SW and STEREO.
●DSP version display
Display the firmware version of the DSP.
●Display the error log.
•Display the time for P-CON ON.
Max: 9999 hours, The time up to one hour is displayed with the step of 10 minutes. “C 50M”
•Output ON time (The time while the sound is being output from the speaker.)
Max: 9999 hours, The time up to one hour is displayed with the step of 10 minutes. “C 50M”
•The number of times when the temperature protection is detected
Max: Count up to 9999 times.
•The number of times when DC error protection is detected.
Max: Count up to 9999 times.
•The number of times when over current error protection is detected.
Max: Count up to 9999 times.
•The number of times when DSP error is detected.
Max: Count up to 9999 times.
•The number of times when the system error is detected.
Max: Count up to 9999 times.
●Clear the error log and installer memories.
Initialize EEPROM.
• After clearing, display the result of it.

8
KAC-PS4D/X4R
CIRCUIT DESCRIPTION
ISO ARCA IN AL VR AMP SE to DIF ADC Ach DSP DRIVER PWR FET FILTER
FEEDBACK, DPSC, ADCS
OVERCURRENT DETECTION
SP OUT AL
L/R
DAC RCA OUT
L/R
+HV REG
HV REG
LC
FILTER FUSE
GND
BATT14.4V
OC DET
DRIVER
U-PUMP
DRIVER
FF
IC101
Q112
D107
D103 D101
D115
Q101
Q103
D105
D117
Q107
Q111
Q109
Q105
D112
D109
Q113
390
R111
R105 4.7
0.1
C129
1
C105
0.1
10K
R103
VCC
OUTB
NC8
OUTA
2
GND
3
INB
4
INA
1NC1 7
6
5
8
0.1
C103
C101
R101
10K
C111 0.47
0.033
TP185
33
C113
120nH
R147 39
L103
R145 39
1/2W
1/2W
220u50
R107
TP184
TP180
C109
0.47
C107
1.2K
15uH
L101
1.5K
R121
47K
R137
2K
R123
390
R117
10K
R125
1
C119
1W
TP172
0.022
R109
47K
47K
R138
10K
R139
100P
C139
0.022
TP171
C121
C123
0.1
3300P
R140
C125
R113
+3.3V
+HV
FD-BL
BL
+12V
+HV
+3.3V
HV
R119 4.7K
HVHV
+HV
+HV
+3.3V
HV
1W
R149
0.027
TH103
22K
R153
4700P
C117
C115 4700P
1.2K
R115
TH101
22K
R151
1/2W
R93
R127
100P
C63 82
1/2W
82
100P
C65
82
R128
R95
82
1/2W
1/2W
+
12
●
Flow of PS4D/X4R signal line and power supply
controls
• Block diagram
The signal from the pin jack is converted into the differential
signal via the isolation amplifier, variable resistor, and single
end.
It is converted into the digital signal in the AD converter and
it is signal-conditioned in the DSP so that it can be amplified
by the PWM digital amplifier.
It is PWM-amplified to the analog signal by the driver and
power MOSFET to the level that can be output from the
speaker.
● Main signal amplifier circuit with PWM
• Main signal amplifier circuit with PWM
The audio signal that is DA-converted is converted into the
signal for PWM in the DSP.
Its level is shifted in the IC101 and it is converted into the
PWM signal whose amplitude is +/- B. The “+” side of the
amplitude is controlled by Q101 of the PchMOSFET and the
“-” side is controlled by Q103 of the NchMOSFET.
The signal right after this step is converted into the digital
signal in the AD converter and is feed-backed to the DSP.
The main signal is output from SP via the low pass filter.
In addition, current of the main signal is monitored in the
over current detection circuit and when the over current is
detected the output level is controlled by the DSP.
The signal for pre-out is output to the pin jack via the DA
converter used for the pre-out.
The 14V of the battery is converted to +/-40V in the SW
regulator. The voltage is controlled in the feed-forward and
anti-pumping circuits.
Over current is detected by R109 and R149. The signal level
is lowered in the DSP when the over current is detected.
Q107 is used to detect the “+” side of the switching current
and Q105 is used to detect the “-” side of the current.

9
KAC-PS4D/X4R
EDCBA
1
2
3
4
5
6
7
Refer to the schematic diagram for the values of resistors and capacitors.
IC1
IC2
IC100
PREAMPLIFIER UNIT X08-4350-10 A/2 (J76-0378-12)
X08B/2
13
W29
W5
W48
W6
W47
W3
W1
W2
C21
C23
C22
C24
C100 C109
W41
C9
C10
C11
C12
W25
W30
W14
W42
W10
W9
W38
W40
W11
W36
W44
W4
W7
W8 W17
W16
W22
W24
W18
W12
W13
W27
W15
W19
W28
W33
W26
W34
W43
W23
W21
W20
W31
W35
W39
W37
(A/B/PRE)
(SET/INFO)
(B:ST/MONO) B-ch
A-ch
1
2
41
42
1
3
PUSH
ENCODER
ROTARY
(AB/A)
(A:ST/MONO)
129
230
INPUT SENSITIVITY
12
1
C118
W45
C117
R29
W46
R202
R108
R33
R34
C104
R106
C101
C102
C105
C106
C107
C108
C110
C113
R102
R107
R113
R116
C1
C2
C27
C28
R9
R10
R25
R26
C3
C4
C31
C32
R11
R12
R27
R28
VR2
VR1
C112
C5
C6
C7
C8
C13
C14
C15
C16
R1
R2
R3
R4
R5
R6
R7
R8
R13
R14
R15
R16
R17
R18
R19
R20
R100
R101
R103
R104
R105
R109
R110 R111
R112
R115
5
80
8
1
4
8
5
1
4
1
61
40
21
20
41
60
CN3
CN4
S100
S101
S102
S103
S104
S105
WH1
CN2
CN1
D100
D103
D102
D101
D104
D105
ED1
PC BOARD (FOIL SIDE VIEW)
X08-4350-10
Ref. No. Address
IC1
IC2
IC100
3C
2B
6B

10
KAC-PS4D/X4R
PC BOARD (COMPONENT SIDE VIEW)
FGHIJ
1
2
3
4
5
6
7
1
C108
C119
C120
C208
C219
C220
C507
C508
C533
C534
C503
L501
L502
SDG
GDSGDSGDSGDS
SDG
SDGSDGSDGSDGSDGSDGSDG
L101
L102
L201
L202
L503
L601
L506
W2 W1
L507
L508
W6
W5 W4
L204
L203
L104
L103
4
1
C942
NP
C142
R596
C140
C233
R594
R946
TH1
TH2
TH6
TH5
TH4
TH3
R593
R595
C122
C124
C222
C224
C228
C227
C518
C562
C506
C535
C536
C519
C563
C566
C915
R233 C234
C544
C565
C567
C568
R234
R540
C940
R884
R885
R965
R546
41
C504
C509
C510
C538
R14
4
R531
R530
R522
R523
R524
R525
R526
R527
R528
R529
R539
R961
R962
R963
R964
R966
R500
C543
R143
R142
R141
R244
R243
R242
C236
C235
R241
C237
C238
R99
C945
C943
C941
C944
C70
R95
C66
R
1
R96
C65
C69
R136
R
2
C948
7
BEBE
DDDD DDDD
S
GGSS SSG
GGS S
EB
SGG
EB
G
DDDDD DDD
D501
D502
D503
J2 J4
Q509 Q510
Q511 Q512
Q513 Q514
Q515 Q516
Q103
Q104
Q203
Q204
Q601 Q602
P1
CN2
CN3
CN4
D511D512
WH1
E1
Q906
Q907
D514
D515
Q116
D113
Q114
Q214
Q216
D213
D506
D507
D117
D508
Q215
Q115
D607 D608
IC509
AUDIO UNIT X09-8620-10 (J76-0376-21)