Onkyo K-505TX User manual

K-505TX
Ref. No . 3675
SERVICE MANUAL
STEREO
CASETTE DECK
MODEL K-505TX
R
SAFETY-RELATED COMPONENT WARNING!!
COMPONENTS IDENTIFIED BY MARK ON THE
CRITICAL FOR RISK OF FIRE AND ELECTRIC SHOCK.
REPLACE THESE COMPONENTS WITH ONKYO
PARTS WHOSE PART NUMBER APPEAR AS SHOWN
IN THIS MANUAL.
MAKE LEAKAGE CURRENT OR RESISTANCE
MEASUREMENTS TO DETERMINE THAT EXPOSED
PARTS ARE ACCEPTABLY INSULATED FROM THE
SUPPLY CIRCUIT BEFORE RETURNING THE
APPLIANCE TO THE CUSTOMER.
SCHEMATIC DIAGRAM AND IN THE PARTS LIST ARE
STEREO CASSETTE TAPE DECK
CASSETTE LOADING MECHANISM
STANDBY / ON
STANDBY
ALBUM
FADE
DOLBY
NR
REV.
MODE
COUNTER
RESET
REC
LEVEL
K
-
505X
SUPP,SUPT
SUDT
Silver models
230V AC,50Hz
120V AC,60Hz
052001

Track format
4-tracks, 2-channels
Erasing system
AC erase
Tape speed
4.8 cm/sec.
Wow and flutter
0.1 % (WRMS)
0.2 % (DIN)
Frequency response
Metal position tape
30 to 15,000 Hz ± 3 dB
High position tape
30 to 14,000 Hz ± 3 dB
Normal position tape
30 to 13,000 Hz ± 3 dB
Signal to noise ratio
•54 dB (metal position tape, Dolby NR
off)
•Noise reduction of 10 dB above 5 kHz
and 5 dB at 1 kHz is possible with Dolby
B NR.
•Noise reduction of 20 dB at 5 kHz is
possible with Dolby C NR.
Input Jacks
LINE IN: 2
Input sensitivity: 80 mV
Input impedance: 50 kohms
Output Jacks
LINE OUT: 2
Standard output level: 500 mV
Output load impedance:
over 50 kohms
Motors
DC servo motor: 1
Heads
REC/PB: Special Hard Permalloy: 1
Erase head: Ferrite: 1
Power supply rating
AC 230-240 V, 50 Hz
AC 120 V, 60 Hz
Power consumption
12 W (230-240 V, 50 Hz)
14 W (120 V, 60 Hz)
Dimensions
205 mm ×76 mm ×278 mm
(Width ×Height ×Depth)
Weight
2.6 kg
Specifications and external appearance are
subject to change without notice as a result of
product improvement.
1. Replacing the fuse
This symbol located near the fuses indicates that the
fuse used is fast operating type. For continued protection against
fire hazard, replace with same type fuse. For fuse rating refer to
the marking adjacent to the symbol.
Ce symbole indique que le fusible utlise est a rapide.
Pour une protection permanente, n'untiliser que fusibles de
meme type. Ce darnier est la qu le present symbol est
appse.
CIRCUIT NO. PART NO. DESCRIPTION
F901 252074 2A-SE-EAK,Fuse
SERVICE PROCEDURES
SPECIFICATIONS
K-505TX

BLOCK DIAGRAM
Q101
Q103.Q104
R115.R116
Q102
P.B.AMP.
P.B. LEVEL
Q201
DOLBY NR. REC EQ. METER AMP DISPLAY
Q709
KEY CONTROL
MECHA AND DRIVER
TAPE
SPEED
R716
S717
AUTO
ADJUSTMENT
START KEY
MICROPROCESSOR
Q701
Q905
5V
(for MICROPROCESSOR)
Q901
Q903
Q906
12V(for SIGNAL)
12V(for MECHA)
-22V(for F.L. TUBE)
D901.D902
T901
D905.D906
POWER TRANSFORMER
AND REGULATOR
Q401-Q405
L401.L402.L403
BIAS OSC AND HX PRO
ERASE
HEAD
R/P
HEAD
IN
OUT
LINE
70/120
K-505TX

U1
U2
P101
T901
U3
U5
Z001
P705
P702
P902A
U6 U4
P703
EXPLODED VIEW
F901
K-505TX

REF.NO.PART NO. DESCRIPTION
1 27100334A Chassis
2 27175323 Leg
3 27175325 Leg
4 838130088 3TTB+8B.Self tapping screw
5 27190897 KGLS-3S.Holder
6 27301394 HL-18-0.Clamp
7 27191045 KGPS-3.5S.Holder
8 28140020
9 830440069 4TTC+6C(BC).Self tapping screw
10 27150407B Shield plate
11 27300750 S-RELIEF #2271.Bushing cord
12 27191137 ML Holder
13 27191138 MR Holder
14 833130100 3TTP+10P.Self tapping screw
15 27122849 Rear panel
16 838430088 3TTB+8B(BC).Self tapping screw
17 27111214 Front bracket
18 28141456 Cushion
19 27212314 Front panel
20 28135247Y Badge
21 28198864 Facet
23 28191796A Clear plate
24 28184795 Cover
25 28141470 Cushion
26 838930088 3TTB+8B(UN).Self tapping screw
27 28148476 (TRAY).Door
P101 2009990659 NSAS-14P0919.Socket AS
P702 20022392635ANSAS-26P0918.Socket AS
P703 2009990469 NSAS-10P0623.Socket AS
P705 204319013 NCFC3-19013.F.F.C
P902A 253193HIT AS-CEE. Power supply cord <P>
253277MIL AS-UC-2#18.Poewr supply cord <D>
T901 2301298 NPT-1314P.Power transformer <P>
2301297 NPT-1314D.Power transformer <D>
U1 1N281546-1A NAAR-7146-1A.Main cuircuit PC board ass'y <D>
1N281546-1B NAAR-7146-1B,Main circuit PC board ass'y <P>
U2 1N281547-1A NAAF-7147-1A,Playback amp. PC board ass'y <D>
1N281547-1B NAAF-7147-1B,Playback amp. PC board ass'y <P>
U3 1N281548-1A NAAF-7148-1A,Dolby circuit PC board ass'y <D>
1N281548-1B NAAF-7148-1B,Dolby circuit PC board ass'y <P>
U4 1N281549-1A NAAF-7149-1A,Recording amp. PC board ass'y <D>
1N281549-1B NAAF-7149-1B,Recording amp. PC board ass'y <P>
U5 1N281550-1A NAPS-7150-1A,Power transformer PC board ass'y <D>
1N281550-1B NAPS-7150-1B,Power transformer PC board ass'y <P>
U6 1N281551-1A NADIS-7151-1A,Display circuit PC board ass'y <D>
1N281551-1B NADIS-7151-1B,Display circuit PC board ass'y <P>
Z001 244247 CMAL2Z7.Deck mechanism
F901 252074 2A-SE-EAK,Fuse <European model only>
PARTS LIST
K-505TX

C
F REC PACK
R REC
METAL
Loading mechanism Cassette mechanism
MECHANISM EXPLODED VIEW PARTS LIST
REF. NO PART NO. DESCRIPTION
1 FF18W-12 Belt F/R
2 FF19H-11 Main belt
3 F567-626 Control circuit PC board
4 FR24S-11 Flywheel ass'y
5 F513-870 Recording/Play head
6 F514-129 Pinch roller R
7 F514-130 Pinch roller L
8 F522-048 Clutch(Flywheel)
9 F522-052 Clutch
10 F525-327 Main motor
21 F564-640 Loading motor
22 UE15S-14 SPPB11,Micro switch
23 UE18P-21 SPPB2A,Leaf switch
24 FF19L-12 Loading belt
25 F527-078 Cassette holder
MECHANISM EXPLODED VIEW
K-505TX

MAIN CIRCUIT PC BOARD(NAAR-7146-1A/1B) CIRCUIT NO. PART NO. DESCRIPTION
CIRCUIT NO. PART NO. DESCRIPTION C913 374721044 ECQ-V50V-104J
ICs C914,C915 354741019
Q701 22241605R3 TMP87CH14F-3CV2 C916 354741009
Q702 22241609R2 BR93LC46F-WE2 Resistors
Q707 22240239 TA7291S R716 5210258 N06HR1KBC,Trimming
Q905 222780055 78M05HF R723,R728 49163272404 RM1/10IJ-2.7K*4,Array
Transistors R901,R902 453534794 5%,1/2W,Metal
Q601,Q703 2213354 or 2SA933S-R or R909,R910 443521004 10
2213355 2SA933S-S Push switches
Q704,Q710 221281 or DTC114YS or S717 25035699 NPS-111-S662
Q712,Q713 2213570 RN1207 Sockets
Q705,Q706 2212853 or 2SB1068-K or JL901B 25050269 NSCT-5P97
2212855 2SB1068-U P102 2009990473 NSAS-12P0627
Q708,Q711 2213090 or DTA114YS or P705A 25051826 NSCT-19P1613
2213590 RN2207 P601 2009990499 NSAS-6P0653
Q901,Q903 2202724 or 2SB1569A-D or Plugs
2202725 2SB1569A-E P201A 25055806 NPLG-17P762
Q902,Q904 2213284 or 2SC1740S-R or P202A 25055706 NPLG-10P662
2213285 2SC1740S-S P203A 25055701 NPLG-5P657
Q906 2211504 2SA950-Y P204 25045305 NPJ-4PDBL164
Q907,Q908 2211705 or 2SD655-E or P402A 25055709 NPLG-13P665
2211706 2SD655-F P701 25045330 NPJ-2PDBL184
Diodes P702A 25055157 NPLG-13P141
D701,D703 223163 or 1SS133 or P703A 25055149 NPLG-5P133
D706 223205 1SS270A P704B 25055444 NPLG-6P426
D702 224470472 MTZJ4.7B Heat sink
D708,D910 224470562 MTZJ5.6B
Q901A,Q903A
27160211-1 RAD-68B
D901,D902 22380035 or GP104003E or Pan head
22380260 RL1N4003
Q901B,Q903B
82143010 3P+10FN(BC)
D903,D904 224471203 MTZJ12C
D905,D906 22380035 or GP104003E or PLAYBACK AMP.PC BOARD(NAAF-7147-1A/1B)
22380260 RL1N4003 ICs
D907 224471603 MTZJ16C Q101 22240147 MPC1330HA
D908,D909 223163 or 1SS133 or Q102 222905 MPC1228HA
223205 1SS270A Transistors
Oscillator Q103,Q104 221299 or DTC114TS or
X701 3010190 CST8.00MTW 2213600 RN1211
Capacitors Capacitors
C701,C912 354780479 C101,C102 374726814 ECQ-B50V-681J
C705 354741019 C103,C104 391980227
C903,C904 374721044 C105,C106 374728224
C905 391954727 C107,C108 391941017
C906,C908 354742219 C109,C110 354741009
C907 391941027 C111,C112 374721834
C909 391941027 C113 391944717
C910 354762209 C114 354741009
C911 354781019 Resistors
R115,R116 5210265 N06HR50KBC,Trimming
R117 443521214
Sockets
P102,P103 2009990473 NSAS-12P0627
Plugs
P101A 25055136 NPLG-6P120
K-505TX
NOTE : TH E COM PONEN TS ID ENTI FIED BY MARK
ARE CRI TI CAL FOR RI SK OF FI RE AN D
ELE CTRI C SHOCK . REPLACE ONLY WI TH
PART NU M BER SPECI FIED.
PARTS LIST
e

DOLBY CIRCUIT PC BOARD(NAAF-7148-1A/1B)
CIRCUIT NO. PART NO. DESCRIPTION CIRCUIT NO. PART NO. DESCRIPTION
ICs Capacitors
Q201 22241144R3HI HA12169FB C401-C408 371121034 MY92-50V-103J
Transistors C409,C410 370131014 APS100V-101J
Q203,Q204 2213090 or DTA114YS or C411,C412 370131214 APS100V-121J
2213590 RN2207 C413 354741019
Q205,Q206 2211705 or 2SD655-E or C414,C419 354744709
2211706 2SD655-F C415 354742219
Q207 221281 or DTC114YS or C416,C417 371124724
2213570 RN1207 C418 371122234
Diodes C420 370131234
D201,D202 223163 or 1SS133 or C422 354741009
223205 1SS270A C427 371121834
D203 224470472 MTZJ4.7B Resistors
Coils R410 443524704 47 5%,1/2W,Metal oxide
L203,L204 233407 NMC-6079 R413,R719 443521004 10 5%,1/2W,Metal oxide
Capacitors Sockets
C203-C208 374722224 P103 2009990473 NSAS-12P0627
C209-C214 374721044 P402 25051238 NSCT-13P1028
C215,C216 354780109 Plugs
C217,C218 354780229 P401 25055233 NPLG-2P217
C219,C220 354780109 Holders
C221-C232 354741009 E811 27190608-1 (CRAMP) UA-0 V0
C233-C237 354780479
C238 354780109 POWER TRANSFORMER PC BOARD(NAPS-7150-1A/1B)
C239,C240 374721044 Capacitors
C241,C242 354741009 C901,C902 374721044 ECQ-V50V-104J
C243 391941027 Sockets
C246 374721534 P903 25051637 NSCT-2P1424 <P>
C247 374723944 25051990 NSCT-2P1777 <D>
Sockets Plugs
P201 25051528 NSCT-17P1315 P902 25055676 NPLG-2P632
P202 25051235 NSCT-10P1025 Fuse holders
P203 25051230 NSCT-5P1020 F901A,F901B 25052133 NSCT-1P2031 <D>
Plugs Wire holders
P205 25055689 NPLG-2P645 JL901A 25051109 NSCT-5P896
RECORDING AMP. PC BOARD(NAAF-7149-1A/1B) DISPLAY CIRCUIT PC BOARD(NADIS-7151-1A/1B)
IC FL tube
Q401 222959 MPC1297CA Q709 212129 BJ254GK
Transistors Diodes
Q402 221281 or DTC114YS or D704 223163 or 1SS133 or
2213570 RN1207 223205 1SS270A
Q403 2211504 2SA950-Y D705 225338 SLR-332VR
Q404,Q405 2201883 2SC1213-C D707 224470432 MTZJ4.3B
Q601,Q703 2213354 or 2SA933S-R or Push switches
2213355 2SA933S-S S701-S716 25035699 NPS-111-S662
Diode Sockets
D601 223163 or 1SS133 or P704A 2009990470 NSAS-12P0624
223205 1SS270A P705B 25051991 NSCT-19P1778
Coils
L401,L402 231127 NCH-4183
L403 231215 NLO-2059
L405,L406 231085 NCH-2133 NOTE : <P> 230V model only
<D> 120V model only
K-505TX

ADJUSTMENT PROCEDURES
PRECAUTIONS TEST EQUIPMENT/TOOL REQUIRED
1. Before adjustment, clean the following parts Audio Oscillator
with an alcohol moistened swab. Digital frequency counter
*recording/playback head *erase head Oscilloscope
*pinch roller *capstan Attenuator
2. Do not use magnetized screwdriver for AC voltmeter
adjustment. Non-magnetic screwdriver
3. Demagnetize recording/playback head with Test tapes
a head demagnetizer. TCC-153 :10kHz, -15dB
MTT-111N :3kHz,-10dB
MTT-150 :Dolby level calibration
400Hz, tone 200nWb/m
Item Connection
of instrument
Line output
level/freq.
Test
tape Mode Output indicator
Adjustme
nt point Adjustment Remarks
1Tape
speed
Frequency
counter to
P205 or LINE
OUT
terminal.
MTT-
111N PB Frequency counter R716 3010Hz
2Head
azimuth
AC voltmeter
&
oscilloscope
to P205
TCC-153 PB AC
voltmeter Fig.1
Maximum level
& same phase
at channels L
& R
Refer to Fig.2.
3Playback
level
AC voltmeter
to P205
MTT-
150 PB AC voltmeter
R115
(L ch.)
R116
(R ch.)
300mV
4Bias
frequency
Frequency
counter to
lead wire of
erase head
Normal
tape REC Frequency counter L403 85kHz
5
Auto Rec
adjustment Normal
tape REC/PB Auto(S717) Push a auto-adjust button(S717)
Blank tapes
Normal UD- C-90
PLAY torque ……………..
30 70g/cm (Use the test tape TW-2231.)
High UD- C-90
FF/REW torque ……………..
80 180g/cm (Use the test tape TW-2111.)
Metal XS C-60
Back tension ……………..
26g/cm (Use the test tape TW-2111.)
K-505TX

D902
D901
R716
S717
L403
NCAR-7146
25137146
25137149
NCAF-7149
NCAF-7148
25137148
NCAF-7147
25137147
0
0
RCH
LCH
LCH
RCH
R115
R116
P205
ONKYO
ONKYO
MAIN CIRCUIT PC BOARD
PLAYBACK AMP. PC BOARD
DOLBY CIRCUIT PC BOARD
RECORDING AMP. PC BOARD
ADJUSTMENT POINT
K-505TX
REV FWD
Rec/Playback head
0 deg. 45 deg.
90 deg. 180 deg.
PHASE CHART