Service Manuals, User Guides, Schematic Diagrams or docs for : Kenwood Cassette Receiver Car Cassette Receiver Car Kenwood KRC-778R & 878R & PS978R KRC-778R & 878R & PS978R
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CASSETTE RECEIVER
KRC-778R/RV/RY/RYV,
878R, PS978R
SERVICE MANUAL C 2000-2 PRINTED IN KOREA
B51-7589-00 ( K ) 1889
The CASSETTE MECHANISM OPERATION DESCRIPTION is the same model D40-1122-05.
Please refer to the service manual for model D40-1122-05(B51-7452-00).
KRC-PS978R
Panel assy
Front glass
KRC-PS978R (A64-1854-02)
(B10-3095-01)
Escutcheon assy . / /
(B07-2146-03)
KRC-878R
Panel assy
Front glass
KRC-878R (A64-1855-02)
(B10-3096-01)
Escutcheon assy B.S/ MTL/ DISP
(B07-2139-03)
KRC-778R
Front glass Panel assy
KRC-778R/RY : KRC-778R KRC-778R/RY :
(B10-3097-01) (A64-1856-02)
KRC-778RV/RYV : KRC-778RV/RYV :
(B10-3098-01) (A64-1952-02)
B.S/ MTL/ DISP
Escutcheon assy
(B07-2139-03)
Torsion coil spring Lever Antenna adaptor Remote controller assy Screw set
(G01-2924-04) (D10-4301-14) (T90-0523-05) (A70-0886-15) (N99-1683-05)
(D10-4302-14)
Plastic cabinet assy DC cord Mounting hardware assy Remote controller assy
(A02-1489-03) KRC-PS978R,878R,778R/RY : (J21-9491-03) (A70-0874-05)
(E30-4788-05)
KRC-778RV/RYV :
(E30-4789-05)
40%
KRC-778R/RV/RY/RYV,878R,PS978R
2
F/E
A8V
SW5V
Q87,89
FM+B 400mV: (K) TYPE
213mV : (E) TYPE
Q86,88
160mV
IC2 B.U.5V
AM+B IC5 +B
FM FM
Q1-6
IC6
AM AM
SYSTEM MUTE
388mV E-VOL E'S DRIVER 4.5V PRE AMP 4.5V PRE OUT
TAPE
N.C.
SDA
SCK
(E) TYPE (K) TYPE
RDS OUT
MPX B.U.5V TAPE 2250mV 2250mV
CHANGER -B
IC10 FM 1715mV 2250mV
REQUEST AM 1069mV 750mV
FSD OUT S METER S MUTE MUTE LOGIC CH 4500mV 4500mV
SDA
SCK
IC12
FM SD 1.8V PRE OUT
IF MODE NOISE (E) TYPE (K) TYPE
PLL CE AMP POSISTOR SW5V TAPE 1800mV 1800mV
PLL DATA IC11
PLL CLK 2 FM 1372mV 1800mV
2 RDS DECODER AM 855mV 600mV
Q82 IC4 CH 3600mV 3600mV
SW5V
IF SELECT FM+B MUTE
WIDE/ SW5V 3
NARROW IC14 BACK UP
POWER IC
CASSETTE IC1 SW5V E2PROM
MECH
RDATA
QUAL
AM+B
FM+B
RCLK
SP-OUT
SDA
SCK
PRE MUTE
NOISE
BLOCK DIAGRAM
MUTE
S METER AC GND
MS OUT
DOLBY B/C AFC P MUTE
DOLBY ON/OFF
MUTE FM SD BEEP
MTL ON/OFF Q39
F/R
MS MODE WIDE EXT. AMP CONT EXT. AMP CONT EXT. AMP CONT
R REEL 6 NARROW
F REEL IF MODE
MODE 1 PLL CE Q32
MODE 2 PLL DATA
MODE 3 PLL CLK DIMMER DIMMER ILL
TAPE IN
MS OUT PHONE TEL-MUTE TEL-MUTE
SUB+ DOLBY B/C SYSTEM u-COM
SUB- DOLBY ON/OFF Q25
MUTE
MOT+B MTL ON/OFF
13 F/R
ACC DET ACC DET. ACC
SW 5V
MS MODE
Q26,27
A 8V R REEL
F REEL ANT CON
ANT ANT CON
MODE 1 CON
CD- MODE 2 P CON
Q24
MD- CHANGER MODE 3
TAPE IN
SW5V B.U.5V
1200mV BU DET BU DET. Q23 Q21,22 Q28,29,31
CH CLK CH CLK SW5 SW5V B.U.5V P CON P CON
REQ H REQ H
REQ C 8 REQ C
CASS/SRM
SUB MOT1
SUB MOT2
SUB MOT3
SRM SW1
SRM SW2
LOCK SW
SRM DET
DATAC DATAC P-5V P-5V
DIMMER
L DATAS
L DATAL
DATAH DATAH
RESET
ILL ON
REMO
L CLK
CH CON CH CON MOTOR BACK UP
L CE
CH RST CH RST
CH MUTE CH MUTE P-ON
Q18-20 Q35,36
BACK UP SW14V
IC15 A 8V A 8V
2 4
7
BU5V RESET
IC13 Q37,38
SRM 2
MECHA SRM SUB SUB MOT
(X13- ) DET. MECHA MOT AVR
DRIVER
IC3
SUB+
SW5V
SUB-
REMO
IC6 Q57-62
IC1,2 RST SW DIMMER B
DC/DC
B
LCD (FOR 4.5V PRE)
DRIVER G/A SW
Q41,42
BACK LIGHT
2 2
MAIN MOT
AVR
ILL
MOT+B
KRC-PS978R
Q33,40,44 KRC-778RV/RYV
Q8 KRC-888
LCD ILL AVR KRC-878R
VLCD
KRC-PS988R
KRC-708
Depeds on the model. KRC-778R/RY
Refer to the parts list. KRC-X858
KRC-778R/RV/RY/RYV,878R,PS978R
MICROCOMPUTER TERMINAL DESCRIPTION
UPD784217GC103(105) (IC1: X14-618X-XX)
System MicroComputer
Pin Pin Name Signal Name I/O Purpose Operation Description
1 P120/RTP0 CHCON O Changer control terminal. ON:Hi, OFF:Lo
2 P121/RTP1 CH_MUTE I Muting input to changer. ON:Hi, OFF:Lo
3 P122/RTP2 REQH O Handshake request to changer.
4 P123/RTP3 DIMMER I Small detection. DIMMER ON:Lo, OFF:Hi
Cassette mechanism main motor
5 P124/RTP4 MOTER O Active; Hi.
output.
6 P125/RTP5 NC O
7 P126/RTP6 NC O
8 P127/RTP7 NC O
9 Vdd Vdd - Positive power supply.
10 X2 X2 - Main clock connection.
11 X1 X1 - Main clock connection.
12 Vss Vss - GND terminal.
13 XT2 XT2 - Sub-clock connection.
14 XT1 XT1 - Sub-clock connection.
15 RESET RESET I Reset input. Active: Lo.
16 P00/INTP0 CH_RST O Reset output to changer. Active: Hi.
17 P01/INTP1 R_CLK I RDS clock input.
18 P02/INTP2/NMI REQC I Handshake request from changer.
19 P03/INTP3 KEY REQ I
20 P04/INTP4 SUB_MOTOR3 O Sub-motor output. 3
21 P05/INTP5 SUB_MOTOR2 O Sub-motor output. 2
22 P06/INTP6 SUB_MOTOR1 O Sub-motor output. 1
23 AVdd Avdd - A/D analog power supply.
24 AVref0 AVref0 - A/D reference voltage input.
1 V or less: TEL MUTE
25 P10/ANI0 PHONE I Phone detection.
/2.5 V or more: NAVI MUTE.
26 P11/ANI1 SRM_SW1 I SRM position detection. Open: Hi.
27 P12/ANI2 NOISE I FM noise detection.
28 P13/ANI3 SMETER I FM S meter detection.
Cassette mechanism reel pulse input
29 P14/ANI4 F_REEL I
(FWD).
Cassette mechanism reel pulse input
30 P15/ANI5 R_REEL I
(REV).
31 P16/ANI6 N.C. I
32 P17/ANI7 N.C. I
33 AVss AVss - A/D GND terminal.
L 40mS:Bass boost OFF
34 P130/ANO0 EXT_AMP O External amp control. L 70mS:Bass boost LOW
L 100mS:Bass boost Hi
35 P131/ANO1 IF_MODE I IF status detection for K2I. Hi = WIDE, Lo = NARROW
36 AVref1 AVref1 - D/A reference voltage input.
37 P70/RxD2/SI2 DATAC I Data line from changer.
38 P71/TxD2/SO2 DATAH O Data line to changer.
39 P72/ASCK2/SCK2 CH_CLK I/O Clock line with changer.
40 P20/RxD1/SI1 L_DATAL I Data line from LCD driver.
41 P21/TxD1/SO1 L_DATAS O Data line to LCD driver.
42 P22/ASCK1/SCK1 L_CLK O Clock line to LCD driver.
43 P23/PCL DIMMER O Dimmer control output.
44 P24/BUZ BEEP O Beep output. Active: Hi.
45 P25/SI0 PLL_CE O CE to PLL.
46 P26/SO0 PLL_DATA I/O Data input/output with PLL.
47 P27/SCK0 PLL_CLK O Clock output to PLL.
48 P80/A0 ILL_ON O ILL ON ILL ON : Hi
5V power supply control for LCD
49 P81/A1 PANEL_5V O Active: Lo.
driver.
50 P82/A2 L_CE O CE terminal to LCD driver
51 P83/A3 LOCK_SW I Panel lock SW detection terminal. Lock SW ON : Lo
3
KRC-778R/RV/RY/RYV,878R,PS978R
MICROCOMPUTER TERMINAL DESCRIPTION
UPD784217GC103(105) (IC1: X14-618X-XX)
System MicroComputer
Pin Pin Name Signal Name I/O Purpose Operation Description
52 P84/A4 WIDE O K2I Forced Wide output. H:Forced Wide
53 P85/A5 NARROW I/O K2I Forced Narrow output. H:Forced Narrow
During reception: Hi
54 P86/A6 AFC I Noise detection time constant SW
/During search: Lo.
55 P87/A7 SRM_SW2 I SRM eject position detection. EJECT:Hi
56 P40/AD0 QUAL I RDS reception quality.
57 P41/AD1 R_DATA I RDS data input.
58 P42/AD2 SRM_DET I SRM mechanism detection. Detected: Lo /Not detected: Hi.
Station detected: Hi
59 P43/AD3 FM_SD I FM SD input.
/Not detected: Lo.
60 P44/AD4 N.C. O
Music detected: Lo
61 P45/AD5 MUSIC I Blank detection input.
/Music not detected: Hi.
62 P46/AD6 B/C O Dolby B/C switching. B = Lo, C = Hi
63 P47/AD7 Dolby O Dolby output. ON : Hi, OFF : Lo
64 P50/A8 EQ_MUTE O EQ muting output. During play: Lo /FF or REW:
65 P51/A9 MTL O Metal output. NOMAL : Hi, METAL : Lo
66 P52/A10 F/R O Tape EQ input switching. FWD:Lo, REW:Hi
Blank detection time constant During play: Hi /FF or REW:
67 P53/A11 MSC O
switching. Lo.
68 P54/A12 MODE3 I Cassette mechanism mode detection.
69 P55/A13 MODE1 I Cassette mechanism mode detection.
70 P56/A14 MODE2 I Cassette mechanism mode detection.
71 P57/A15 PACK_DET I Cassette mechanism pack detection. Pack detected: Lo.
72 Vss GND - GND terminal.
73 P60/A16 TYPE0 I Destination type terminal 0.
74 P61/A17 TYPE1 I Destination type terminal 1.
75 P62/A18 TYPE2 I Destination type terminal 2.
76 P63/A19 ST_TYPE0 I IC2 Ver.3 destination type terminal 0.
77 P64/RD ST_TYPE1 I IC2 Ver.3 destination type terminal 1.
78 P65/WR N.C. O Not used.
79 P66/WAIT N.C. O Not used.
80 P67/ASTB N.C. O Not used.
81 Vdd Vdd - B.U.5V
82 P100/TI5/TO5 SVR O SVR discharge control. POWER OFF:Hi
83 P101/TI6/TO6 PREMUTE O PRE mute. Active: Lo.
84 P102/TI7/TO7 PMUTE O Power IC muting. P IC ON : Hi
Cassette mechanism / SRM
85 P103/TI8/TO8 CASS/SRM O C mech.:Hi, SRM mech.:Lo
mechanism voltage SW terminal.
86 P30/TO0 ANT_CON O Antenna control. Active: Hi.
87 P31/TO1 AM+B O AM power supply. Active: Hi.
88 P32/TO2 FM+B O FM power supply. Active: Hi.
89 P33/TI1 P_CON O Power control. Active: Hi.
90 P34/TI2 ACC_DET I Acc detection. Acc OFF:Hi.
91 P35/TI00 REMO I Remote control input.
92 P36/TI01 P_ON O Power supply control. POWER ON:Hi
93 P37 BU_DET I Momentary power down detection. Power down: Hi.
94 TEST TEST - Test terminal.
95 P90 IC2_SDA I/O IC2, IC5 and EEPROM data line.
96 P91 IC2_SCK O IC2, IC5 and EEPROM clock line.
97 P92 MUTE O Muting terminal. OPEN:MUTE ON
98 P93 SW5V O 5 V power supply. Lo=SW5 ON
99 P94 N.C. O Not used.
100 P95 N.C. O Not used.
4
KRC-778R/RV/RY/RYV,878R,PS978R
TEST MODE
2000 MODEL 3. Press and hold the AUDIO key for 1 second to enter the
menu mode.
(1) How to enter the test mode
4. Press the FM/AM key to select "SECURITY".
Reset the set while holding the FM and preset 6 keys
5. Press and hold the Track UP/DOWN key for 2 seconds.
depressed.
6. Enter the security code by pressing the preset 1, 2, 3
All indications light up at the moment the test mode
and 4 keys.
starts.
Example: To enter "3510"
(2) How to exit from the test mode - Press preset key "1" 4 times.
Reset the set while holding the preset 6 key. - Press preset key "2" 6 times.
(Note) The test mode is not canceled by turning Acc OFF, - Press preset key "3" 2 times.
turning power OFF or causing momentary power down. - Press preset key "4" 1 time.
(3) FM S meter voltage adjustment 7. Press and hold the DISP key for 3 seconds so that
1. Enter the test mode. "APPROVED" is displayed.
2. While holding the preset 1 key depressed, press and 8. Exit from the test mode (see "(2) How to exit from the
hold the preset 6 key. test mode").
3. "ADJ OK" is displayed when the result is OK or "ADJ (11) Simplified security code clear procedure
NG" is displayed when it is No Good. (KRC-X858, KRC-708)
(4) AM SD voltage write 1. During the code request mode, while holding the DISP
1. Enter the test mode. key depressed, press and hold the Volume UP key for
2. While holding the preset 1 key depressed, press and 3 seconds (so that "----" disappears).
hold the preset 6 key to write the SD voltage data. 2. Enter "KCAR" from the remote control unit. (Same oper-
ation as with the '98 models)
(5) Forced Auto/Manual switching of K2I - Press numeric key "5" 2 times and press the Track UP
Press and hold the TI key in the TUNER mode to switch
key (to enter "K").
between AUTO and MANUAL.
- Press numeric key "2" 3 times and press the Track UP
The initial status is MANUAL, which is indicated by the
key (to enter "C").
lighting of the TI dots.
- Press numeric key "2" 1 time and press the Track UP
(6) Forced Narrow/Wide switching of K2I key (to enter "A").
Press the preset 6 key in the TUNER mode to switch - Press numeric key "7" 2 times and press the Track UP
between Forced Narrow and Wide. key (to enter "R").
The initial status is Wide, which is indicated by the light- 3. The security is canceled and the set enters the TUNER
ing of the NEWS dot. mode.
(7) TAPE test mode specification (12.1) MASK key write procedure in production line
o The blank skip function is initially turned off. (when the E2PROM is in the initial status)
(8) Audio adjustments 1. While holding the FM and preset 6 keys depressed,
o The volume should be set to -10 dB (displayed as "30"). press RESET to enter the test mode.
o The bass/treble and balance/fader controls are set to 2. Press and hold the AUDIO key for 1 second to enter
full boost/full cut and full front/full rear respectively by the menu mode.
single press of the UP/DOWN key. 3. Press the FM or AM key to select "Mask key".
o The high-pass filter is set to Through/100 Hz/200 Hz by 4. Press the Track UP/DOWN key shortly so that
each press of the UP key, or to 200 Hz/100 "TRANSMIT1" is displayed.
Hz/Through by each press of the DOWN key. 5. Point the MASK key to the light sensor and press and
hold the key for more than 0.5 second.
(9) Back-up current measurement 6. When "TRANSMIT2" is displayed, press and hold the
When the set is reset while Acc is off (i.e. when the back- MASK key again for more than 0.5 second. Note that
up power is on) or when Acc is turned off in the middle of the first and second counter codes are not compared
test mode, the MUTE pin turns ON in 2 seconds instead at this time.
of 15 seconds. (The panel/CD/C/MD mechanism is not 7. The write operation is complete when "APPROVED" is
activated at this time.) displayed. At this time, the demonstration mode is set
(10) Procedure for security code registration after and the test mode is canceled.
the E2PROM replacement during servicing (Note) Similarly to the '98 models, leaving the set for more
(KRC-888 only) than 30 minutes without writing the code causes an
1. Enter the test mode (see "(1) How to enter the test error and turns power off.
mode").
2. Press the SRC key to select ALL OFF.
5
KRC-778R/RV/RY/RYV,878R,PS978R
TEST MODE
(12.2) Procedure for canceling the MASK key (13) Other
request (when the set is reset or the back-up o Automatic panel closing when the TAPE/CD/MD is
power is turned off while the MASK key is inserted is disabled.
enabled) o Pressing the ATT key ON/OFF opens or closes the
1. When the power is supplied and the set is switched on, panel. (The ATT operation can be activated from the
"TRANSMIT1" is displayed and the MASK key request remote control unit.)
mode starts. o The DNPP/SBF key of the remote control unit (RC-510)
2. Point the MASK key toward the light sensor and press functions as the menu mode ON/OFF key.
and hold for more than 3 seconds (until the level indi- o The OPEN/CLOSE key of the remote control unit (RC-
cator indicates the full condition). 510) functions as the audio adjustment mode ON/OFF
3. When "TRANSMIT2" is displayed, press and hold the key.
MASK key again for more than 3 seconds.If "TRANS- o The menu feed operations occur only with the necessary
MIT1" is displayed now, go back to step 2 and restart features.
from there again. o Display such as "CODE OFF" is not displayed at the
4. When "APPROVED" is displayed, the MASK key is moment power is turned on.
enabled and the set is turned on. o Pressing the TI (AUTO) key during the changer opera-
(12.3) Procedure for MASK key initialization tion turns 2zone on, and pressing the TI (AUTO) key
(Resetting the MASK key enabled condition to again cancels it. The P/S dot lights during the 2zone
the factory-set condition) operation.
1. While holding the FM and preset 6 keys, press RESET o Pressing and holding the MENU key for more than 1
to enter the test mode. second while ALL OFF initiates the MASK KEY write
2. "TRANSMIT1" is displayed and the MASK key request mode.
mode starts.At this time, the display shows "* *" in o The dimmer control of the FL models or the contrast
place of "[ ]". control of the LCD models can be adjusted only to
3. Press the MASK key cancel remote control for more 0/5/10 using the UP/DOWN keys.
than 3 seconds.
4. When "TRANSMIT2" is displayed, press and hold the
MASK key again for more than 3 seconds.
5. When "APPROVED" is displayed, the MASK key is
canceled, the demonstration mode is set, the test
mode is canceled and the set returns to the factory-set
condition.
(12.4) MASK key all-clear procedure
1. While holding the FM and preset 6 keys, press RESET
to enter the test mode.
2. Press and hold the AUDIO key for more than 1 second
to enter the menu mode.
3. Press the Track UP/DOWN key to select "Mask key".
4. Press and hold the FM or AM key for more than 2 sec-
onds so that "TRANSMIT1" is displayed.
5. Point the MASK key cancel remote control toward the
light sensor and press for more than 3 seconds (until
the level indicator indicates the full condition).
6. When "TRANSMIT2" is displayed, press and hold the
MASK key again for more than 3 seconds.If "TRANS-
MIT1" is displayed now, go back to step 2 and restart
from there again.
7. When "APPROVED" is displayed, the E2PROM is
cleared entirely and the condition in "(14) MASK key
write procedure in production line (when the E2PROM
is in the initial status)" returns.
6
KRC-778R/RV/RY/RYV,878R,PS978R
ADJUSTMENT
Set the controls and switches as follows.
BALANCE :center position BASS :center position LOUD :OFF DOLBY NR :OFF
FADER :center position TREBLE :center position
TUNER
OUTPUT ALIGNMENT
No ITEM INPUT SETTINGS (RECEIVER) ALIGN FOR FIG.
SETTINGS POINTS
SETTINGS
FM SECTION
98.1MHz
TEST MODE:ON
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