Denon DR-M3QHX User manual

Hi-Fi Component
DENON
SERVICE MANUAL
*
STEREO CASSETTE TAPE DECK
MODEL DR-M3QHX
NIPPON COLUMBIA CO.. LTD.

TABLE OF CONTENTS
FEATURES . 2
SPECIFICATIONS. 3
BLOCK DIAGRAM. 4
LEVEL DIAGRAM . 5
PART NAMES AND FUNCTIONS . 6-7
OUTLINE OF THE MECHANISM CONTROL MICROCOMPUTER. 8
DISASSEMBLY INSTRUCTIONS. 9-11
ADJUSTING AND CHECKING THE MECHANISM SECTION .12-14
ADJUSTING THE ELECTRICAL SECTION.14-17
PARTS LIST OF P.W. BOARD .18-19
PARTS LIST OF EXPLODED VIEW. 20
EXPLODED VIEW OF CABINET AND CHASSIS GROUP. 21
EXPLODED VIEW OF MECHANISM VM861 UNIT. 22
PARTS LIST OF MECHANISM VM861 UNIT AND OTHER PARTS . 23
FUNCTION OF REMOTE CONTROL 1C . 23
SCHEMATIC DIAGRAM OF AUDIO AMP UNIT... 24
P.W. BOARD OF KU-5881 AUDIO AMP UNIT. 25
SCHEMATIC DIAGRAM OF POWER/LOGIC UNIT. 26
P.W. BOARD OF KU-5871 POWER/LOGIC UNIT
AND KU-5890 MECHANISM UNIT . 27
SCHEMATIC DIAGRAM OF COUNTER METER UNIT ... 28
SEMICONDUCTORS. 29
WIRING DIAGRAM .. 30
FEATURES
■ Computer-controlled servo technology
* Closed-loop dual-capstan tape transport.
* Silent, soft-touch controls provide maximum ea$e-of*use.
* Computer-controlled, full-logic tape controls enable fool-proof operation.
■ Three-head design utilizes DENON's new SF record/playback combination head assembly.
■ Computing tape counter with 4-digit readout and memory stop.
■ Dolby-C noise reduction systems (Double Dolby System).
■ Dolby HX PRO head room extension system.
■ Wireless remote control.
■ Extended range, dual-color fluorescent peak meters.
■ Auto tape selector.
■ Recording Bias adjustment.
(2)
SPECIFICATIONS
• Type .
• Heads.
• Motors.
• Tape Speed.
• Fast forward, rewind time . . .
• Recording bias.
• Overall S/N ratio .
(at 3% THD level)
• Overall fequency response. . . .
• Channel separation.
• Crosstalk.
• Wow Aflutter.
• Inputs
line .
• Outputs
line .
Headphone .
• Accessories.
• Power supply.
• Power consumption .
• Dimensions.
• Weight.
Vertical tape loading 4-track 2-channel stereo cassette tape deck
SF Record/Playback combination head x 1
Erase head (Ferrite) x 1
Electronic servo DC motor (for capstan) x 1
DC motor (for reel winding) x 1
4.8 cm/sec.
Approx. 90 sec. with a C-60 cassette
105 kHz
Dolby C NR on ... more than 75 dB (CCIR/ARM)
25 - 19,000 Hz ±3dB (at -20 dB METAL tape)
More than 40 dB (at 1 kHz)
More than 65 dB (at 1 kHz)
0.045% wrms (JIS method)
lOOmV (—18 dB) input level at maximum
Input impedance: 50 kohm unbalanced
775mV (0 dB) output level at maximum (with 47 kohm load,
recorded level of 200 pwb/mm)
1.2mW output level at maximum (optimum load impedance 8 ohm
— 1.2 kohm)
Parallel pin cord x 2
50 Hz/60 Hz compatible, voltage is shown on rating label
18W
434 (W) x 115 (H) x 286 (D) mm
5.6 kg
■ Above specifications and design styling are subject to change for improvement.
■ Dolby noise reduction and HX PRO headroom extension manufactured under license from Dolby
Laboratories Licensing Corporation. HX PRO riginated by Bang and Olufsen. “Dolby", the double-D
symbol and "HX PRO" are trademarks of Dolby Laboratories Licensing Corporation.
WARNING:
1. Component parts
Parts marked with ^ and/or shading in this service manual have special characteristics important to
safety. Besure to use the specified parts for replacement.
2. Leakage current
Before returning the appliance to customer, test the leakage current when the power plug is connected.
Use a calibrated (with an error of not more than 5%) leakage current tester and measure the leakage
current from any exposed metal to the earth ground. Reverse the power plug polarity and test the
above again.
Any current measured MUST NOT EXCEED 0.5 mitliamps. Corrective measure must be taken if it
exceeds the limit.
(3)

LINE IN
--CH @
BALANCE
VR303
26
IC102
TEA0665
INPUT VR
VR304
ENCOOER SLOCK
BLOCK
DIAGRAM

»
LEVEL DIAGRAM
PLAYBACK SYSTEM
TCC-130
(400Hz)
DOLBY B-Typ»
RECORDING SYSTEM
NPUT FREQUENCY
400Hz
DOLBY NR SYSTEM
0dB=0.775V
( 5 )

PART NAMES AND FUNCTIONS
© ® © ® ® © ® ® ® ®
1. POWER switch
Controls the supply of AC power to the deck. One push
turns the deck on, a second push turns it off. The deck
remains in a stand-by {non-operative) mode for approxi¬
mately 4 seconds after it is switched on.
2. EJECT button
Press this button to eject the cassette. When the deck is
operating (tape is running), press the stop { ■ ) key first to
stop the tape transport; then press the EJECT button.
3. COUNTER RESET button
Operation of the button resets the counter to all zero.
4. MEMORY STOP button
During rewinding operations, the tape will stop at the
"0000"• counter point automatically when this button is
pressed in.
5. DOLBY NR switches
The left Dolby NR switch activates (in) or deactivates (out)
the deck’s Dolby noise reduction circuitry. The right
switch selects between Dolby B-Type (out) or C-Type NR
(in).
6. MPX FILTER switch
The MPX FILTER switch should be used to prevent inter¬
ference with the Dolby NR circuit when making Dolby NR
encoded recordings of FM stereo programs. When making
Dolby NR encoded recordings from any program source
other than FM stereo, leave this switch in the "off" (out)
position.
7. MONITOR switch
The SOURCE (in) position of this switch allows you to
monitor the source program before it is recorded. The
TAPE (out) position of this switch is used for tape play¬
back monitoring or simultaneous monitoring during record¬
ing.
8. BIAS FINE ADJ control
(for NORMAL and Cr0 2 tape)
Adjust the bias according to the tape characteristics.
Standard biasing is obtained at the center click-stop posi¬
tion.
9. BALANCE controls
This is the knob to adjust the recording level balance be¬
tween the left and right channels. Turn it counterclock¬
wise to reduce the right channel's level and clockwise to
reduce the left channel's. Usually, put the knob at the
center click position.
10. PHONES jack
For private music enjoyment without disturbing others,
or for monitoring a recording, a set of headphones may be
plugged in. Impedance should be from 8 to 1200 ohms.
11. OUTPUT LEVEL control
This control adjusts playback, recording monitor, and
headphones output levels for the both channels simultane¬
ously.
12. INPUT LEVEL controls
The recording input level is adjusted by this knob. The
levels in the left and right channels can be changed sim¬
ultaneously.
( 6 )
< T
*
13. Cassette compartment cover
When a cassette tape is inserted and the door is closed,
the tape is automatically wound up for about 0.3 sec to
eliminate the slack.
14. TAPE COUNTER
A four-digit readout indicates the present tape count posi¬
tion.
15. FLUORESCENT PEAK METERS
These meters indicate recording or playback peak levels
for each channel.
16. MEMORY indicator
When the memory switch is turned on, the letters of
"MEMO" will be displayed.
17. NR SYSTEM indicator
This indicator light is interlocked with the Dolby NR
switch and informs the user that Dolby NR is in use as well
as which IB nr CiTvoe
18. MONITOR indicator
This indicator light is interlocked with the MONITOR
switch to inform the use of the selected monitoring source
- TAPE or SOURCE.
19. TAPE SELECT indicator
This indicator light is* interlocked with the Auto Tape
Select feature which automatically adjusts the deck to the
type of tape in use. (NORMAL, Cr0 2 or METAL).
20. REMOTE CONTROL photosensitive window
•The window receives commands from the infrared remote
control unit.
•Operate the remote control unit (RC-101) directing to¬
ward the photosensitive window.
21. T ape transport controls
(7)
I

• Outline of the Mechanism Control Microcom¬
puter
The function of the microcomputer, which is applied to the 0) Stable and accurate cam rotation position control is
uni-directional transport cam drive control cassette deck required since a cam drive method is employed to
mechanism, will receive an outside signal from the opera- make the mechanism silent. Accurate rotation position
tion switch (operations such as PLAY, REC, STOP, FF) control is performed by using a cam drive with a rotary
during the recognition of the current condition or from the encoder detected digital feedback servo,
surrounding circuits of the microcomputer (counter, cam (2) Since the leading time of the cam drive is slower when
encoder, reel pulse, etc.) and sends the appropriate con- compared to that of the plunger method, problems will
trol signal. a r » 5 e when attempting record/pi ay back or stop at the
To the mechanism: rotational direction of the reel motor, designated tape position from FF or REW, since tape
speed, stop, rotational direction of the cam motor, stop. overrun occurs.
To the counter: makes an output of the mechanism run
mode command (REW, FF, PAUSE, PLAY).
To the display: REC, PAUSE (REC MUTE during flash).
In addition, the following points are taken into consider¬
ation.
( 8 )
DISASSEMBLY INSTRUCTIONS
1. H o w to Remove the Front Panel
(1) Unscrew the 4 screws 309 from both sides of the top
cover 240 and take off the top cover by pulling it up.
(2) Press the eject knob 231, open the cassette window
238 and take off the mechanism, as shown in the dia¬
gram.
Note: Be careful when handling the cassette window,
as it is easily scratched.
(3) T he front panel can be removed by unscrewing the 3
upper screws (3x8 CFTS S tight) 307 from the front
panel 233 and the 3 lower screws (3x8 CBTS P tight)
2. H o w to Remove the Mechanisms
(1) Remove the top cover 240 and the front panel 233.
(Refer to section 1)
(2) Unscrew the 2 mechanism holding screws (3x6 CBTS S
tight) 304 from the bottom surface of the chassis 201.
(3) Unscrew the 2 screws (3x6 CBTS S tight) 304 holding
the angle 210 and the mechanism 207 and the 3
chassis holding screws 301.310 and remove the angle.
(4) Remove the connectors with lead wires, which runs
from the mechanism section, from the circuit board.
Audio circuit board side 4P connector CN301
6P connector CN302
Logic circuit board side 6P connector CN1
7P connector CN3
8P connector CN2
Note: When assembling, check to make sure the con¬
nectors are inserted correctly.
(5) Pull out the power switch lever 230 from the power
switch 259.
(6) Remove the eject knob 231.
(7) The mechanism can be removed by holding the mecha¬
nism and pulling up.
Note: When assembling, do so after checking to make
sure the 2 stay holes on the lower side of the
mechanism unit are matched with the chassis
protrusions.
3. H o w to Remove the Meter Window and the
Color Filter
(1) Remove Top Cover (240) and Front Panel (233)
(Refer to Section 1)
(2) Meter Window (220) can be removed by pulling up.
(3) Color Filter (221) cam be removed after Meter Window
(220) is removed.
4. H o w to removed the Meter Holder and the
Counter/Meter Circuit Board, the LED circuit
Board.
(1) Remove the top cover (240) and the front panel
(233). (Refer to section 1)
(2) Remove the angle (210). (Refer to section 2)
(3) Remove the 2 screws (3x8CFTS S tight) (307) which
secure meter holder (242). Then the meter holder can
be removed.
(4) By unscrewing the 2 screws (3x6 CBS) (303) holding
the counter/meter circuit board, it can be removed.
(5) By unscrewing the 1 screw (3x6 CBS) (303) holding
the LED circuit board, it can be removed.
(9)

5. How to Remove the Front Esc Ass'y
(1) Remove the top cover (240) and the front panel (233).
(Refer to section 1)
(2) Remove the angle (210). (Refer to section 2)
(3) Remove the meter window (220) and the color filter
(221). (Refer to section 3)
(4) Unscrew the 2 nuts holding the output volume (237)
and the headphone jack (255). Then the front esc
ass'y (206) can be removed.
6. How to Remove the Volume Circuit Board
(1) Remove the top cover 240 and the front panel 233.
(Refer to section 1)
(2) Remove the angle 210 (Refer to section 2)
(3) Remove the meter window 220 and the color filter
221. (Refer to section 3)
(4) Remove the front escuchion 206. (Refer to section 4)
(5) By unscrewing the 3 screws (3x8 CBTS P tight) 301
holding the Volume plate 245 and loosening the 2
hooks on the front escuchion ass'y 206 holding the
Volume circuit board 244, it can be removed.
(6) Unscrew the 3 nats holding the 3 Volumes. Then the
Volume circuit board 244 can be removed.
7. How to Remove the Control Circuit Board
(1) Remove the top cover 240 and the front panel 233.
(Refer to Section 1)
(2) Remove the angle 210. (Refer to section 2)
(3) Remove the meter window 220 and the color filter
221. (Refer to section 3)
(4) Remove the front escuchion 206.
(Refer to section 4)
(5) By unscrewing the 3 screw (3x8 CBTS P tight) 301
holding the control circuit board and loosening the 2
hooks on the front escuchion Ass’y 206 holding
the control circuit board 204, it can be removed.
Note: When replacing the tact switch 224, always
check to make sure that it is not floating above
the circuit board. If it is floating, the switch
will be in the on condition when the set is
assembled.
8. H o w to Remove the Audio Circuit Board
(1) Remove the top cover 240 and the front panel 233.
(Refer to section 1)
(2) Remove the angle 210 (Refer to section 2)
(3) Remove the meter holder 242. (Refer to section 4)
(4) Remove the front escuchion 206.
(5) Remove the volume plate 245. (Refer to section 6)
(6) Remove the control circuit board 204. (Refer to
section 7)
(7) Remove the connectors from the audio circuit board
203.
(8) Unscrew the 4 bottom cover holding screws (3x8
CBTS P tight) 301 on the back side of the chassis
201 and remove the bottom cover 218.
(9) By loosening the 2 hooks on the chassis holding the
audio circuit board 203, the audio circuit board can be
removed.
Note: Most repairs to the audio circuit board can be
performed by removing the bottom cover on
the chassis. Refer to the above procedure
only when necessary.
When reassembling, follow the procedures
in reverse order; however, if each of the
various parts are not assembled properly in
their respective position, the set cannot be
assembled. When assembling, check the work
of each step carefully.
( 1 0 )
«
1
9. H ow to Remove the Logic Circuit Board
(1) Remove the top cover 240. (Refer to section 1)
(2) Remove the various connectors from the logic circuit
board 202.
(3) Unscrew the screws (3x8 CBTS P tight) 301 holding
the logic circuit board.
{4} By pulling up the logic circuit board 202, it can be
removed.
10. How to Remove the Power Switch Circuit
Board
(1) Remove the top cover 240. (Refer to section 1)
(2) Unscrew the 1 screw (3x8 CBTS P tight) 301 holding
the bracket 216 of the power switch circuit board
215.
(3) By pulling the power switch lever 230 out of the power
switch 259, the power switch circuit board 215 can
be removed upwards.
11. How to Remove the Remote Sensor Circuit
Board
(1) Remove the top cover (240) and the front panel (233).
(Refer to Section 1)
(2) Remove the angle (21). (Refer to Section 2)
(3) Remove the meter holder (242). (Refer to Section 4)
(4) By unscrewing the 1 screw (3x6 CBS) (303) holding
the Remote Sensor Circuit Board, it can be removed.
(ID
i

«
1
ADJUSTING AND CHECKING THE MECHANISM
SECTION
1. Replacing the Pinch Roller.
Before replacing the pinch roller, clean the tape contact
surface of the pinch roller and the capstan shaft.
Most causes of poor tape transport can be traced to dirty
pinch rollers and capstan shafts.
The right side pinch roller 23 can be taken out by remov¬
ing spring 24 and slit washer 317. In the same manner,
the left side pinch roller 104 can be taken out by remov¬
ing spring 106 and slit washer 317. After replacing, play
a padless C-90 tape and check for tape curls at the head
tape guide section.
In addition, in the playback mode, check to make sure
that the right side pinch roller contacts the capstan shaft
before the left side pinch roller contacting.
3. R e placing the Record/Ptayback Head
* Before replacing, remove the front panel 233.
(1) H o w to remove the R/P HEAD.
1} Next, Take out the azimuth adjustment NUT 311,
tilt adjustment NUT 311, and the height adjustment
Special nut 10 loosening them alternately.
If they are not loosened alternately, the R/P HEAD
base may become warped.
2) By unsoldering the HEAD WIRES on the circuit board
section of the R/P HEAD, the entire R/P HEAD
can be taken off the mechanism unit.
<X> R/P head
Correct
P. Roller arm L
( JO) Special not
Tape guide
2 nut
P. Roller arm R
Tape
E. head
Special nut
/ 2 nut
R/P head
Defective
Curled
Curled
Tape travel
2. Checking the Pressure Force of the Pinch
Roller
In the playback mode, hook a spring weight onto the
bracket at the center of the pinch roller. After separating
the pinch roller from the capstan shaft, allow the pinch
roller to contact the capstan shaft again. When the pinch
roller starts to rotate, check to make sure the rod type
spring weight reading is 350g—450g for the right side and
150g ~ 250g for the left side.
If it is not within the normal range, replace the pinch
roller spring 24 or 106.
Pinch roller spring
Capstan shaft .41. /
Pinch roller
Right side
350g ~ 450g
Left side
150g ~ 250g
(S7j) 2n
®>2N
(Azimuth adj..nut)
(Tilt adj. nut)
(2) H ow to assemble the R/P HEAD.
Reverse the above (1) procedures for removing the R/P
HEAD.
* Solder the HEAD WIRES according to the diagram
above.
ri+i
U+l M|—i
U-l 1 —I
Orange
Yellow
White
4. A djusting the R/P HEAD
(1) H eight adjustments (Use the head adjusting jig THG-801
1) Set the THG-801 tool plate on the mechanism unit; turn
the height adjustment Special nut 10 and adjust so
that the 3.8 mm measure section of the THG-801 {too!
grip) can pass without contacting the tape guide of
the R/P HEAD 9.
2) When adjusting the height, make sure the R/P HEAD is
not tilted by turning the azimuth adjustment nut 311
nut, and checking with your eyes.
* Never allow the THG-801 {tool grip) to hit the tape
contact surface of the R/P HEAD strongly. It may
scratch the surface.
{ 1 2 )
1
s
(2) A djusting Tilt Angie
1) Set the THG-801 Tool Plate on the Mechanism Unit
and then place the THG-801 Tool Grip on the R/P
Head, and check the Tilt Angle between THG-801 Tool
Plate and THG-801 Tool Grip. If the THG-801 Tool
Grip is tilting toward the front, loosen Tilt with nut
{311). If the THG-801 (Tool Grip) is tilting toward
the rear, tighten it. Adjust the Tilt Adjustment nut
(311) until the THG-801 Tool Grip becomes parallel
with the THG-801 Tool Plate.
2) If the Tilt Angle is adjusted more than once, height
Adjustment may slip. Always make sure to check
height adjustment. If height has slipped, adjust it
again. After adjustment, fix screw.
(3) A zimuth adjustments
Play back the A*BEX TCC-153 test tape. Turn the azimuth
adjustment nut and adjust so that A of the resurge wave
form is maximum and B is minimum. After the azimuth
adjustments, re-check the head height with the THG-801 to
make sure the height has not deviated.
MTT-U4
* After the adjustments, apply anaerobic adhesive on
the positions indicated in the diagram.
Anaerobic adhesive
5. A djustment and Replacement of Erasing Head
(1) Height Adjustments
Set the THG-801 Tool Plate on the mechanism unit.
Using a surface measure of 3.8 mm from the THG-801
Tool Grip, turn adjustment nut (311) and (171) and
adjust the height of Erasing Head's center to coincide
with the center of the THG-801 Tool Grip. After
adjustment, place the THG-801 Tool Grip on the
Erasing Head, check to see that the THG-801 Tool
Plate and the THG-801 Tool Grip are parallel, and that
the Tilt Angle has not changed. Lock after adjustment.
(2) Tilt Angle Adjustment
Set the THG-801 Tool Plate on the mechanism unit.
Place the THG-801 Tool Grip on the Erasing Head, and
check the gap between the THG-801 Tool Plate and
the Tool Grip. If the THG-801 Tool Grip is tilting
toward the front, loosen the Tilt adjustment nut (311).
If it is tilting toward the rear, tighten it and adjust the
Tilt adjustment nut- (311) until the THG-801 Tool
Grip becomes parallel with the THG-801 Tool Plate.
CAUTION: After adjusting the Tilt Angle, height adjust¬
ment may sometimes be warped. Recheck
height adjustment. If it is warped, readjust
the height. After adjusting, fix nuts (311)
and (171).
(3) Erasing Head Replacement
Erase Head may be replaced after removing nuts
(311) and (171} which affix it to the deck mechanism.
After replacement, adjust the height and the Tilt angle.
1
6, Height Adjustment of the Tape Guide
Set the THG-801 jig plate onto the mechanism unit and ad¬
just the height by rotating the height adjustment nut 311
so that the 3.8mm section of the THG-801 jig can pass
through without contacting the tape guide section of tape
guide 103.
7. Checking the Take-up Torque
Load the cassette type torque meter. Check to make sure
that the torque meter average reading is within 40 80
g-cm during playback. If it is not within this range, check
the voltage (4.3V ± 0.3V) of the reel motor. If the voltage
is low, the torque will be weak; if it is high, the torque will
be strong. In addition, check for reel thrust movement
in section 8.
(13)
i

8. Adjusting the Reel Thrust Movement
Check to make sure that the reel thrust movement is
within 0.2—0.4 mm.
9. Checking the FF and REW Torques
* When using the cassette type torque meter.
Check to make sure the torque meter indicates more
than 80 ~ 160 g*cm at the end of FF and REW.
* When using a modified cassette half.
Load the modified cassette half; hook the end of the dial
tension meter (full scale 100—300 g) onto the triangle
section. In the FF (REW) mode, feed the tape in at a
rate somewhat slower than the take up speed. Check
to make sure the dial tension meter reads more than 60
g-cm.
10. Checking the Back Tension Torque During
Record/Playback
Load the cassette type torque meter; check to make sure
the torque meter reads between 5^13 g-cm during play¬
back and that there is no unevenness.
If it is not within this range, check the section on adjust¬
ing the reel trust movement; or replace the spring 109.
11. Checking the FF and REW Times
Load a C-60 cassette tape; check to make sure the tape is
fast forwarded or rewound within 70—110 seconds. If
it is not within this range, check sections 8 and 10.
12. Checking the Operation of the Erase Preven¬
tion, Metal and Chrome Switch Operation
Arms
Check to make sure the operation arms 58, 59 operate
the switches positively, depending on whether or not there
are holes.
13. Checking the EJECT Switch
To check the operation of the EJECT SW with only the
mechanism unit, make sure the angle 205 operates the
switch positively when the hook lever 203 is operated.
14. Checking the Gap Between the Pulse Detection
LED and the Reel Ass'y
Check to make sure the gap between the surface of the
shutter section of the reel ass'y and the LEDs is approxi¬
mately 1 mm.
25 Reef Ass'y
Approximately 1 mm
ADJUSTING THE ELECTRICAL SECTIONS
• Measuring instruments necessary for adjustments
(1) Audio signal generator
(2) Variable resistance attenuator
(3) Electronic voltmeter
14) Oscilloscope
(5) Frequency counter
(6) Adjustment screwdriver
(7) Trap coil adjustment square stick
(8) Test tapes (SONY TY-224, A-BEX TCC-153, TCC-130
(A-BEX TCC-262)
(OENON DX3H, HD7E)
(9) Transport Check cassette tape
(A-BEX TCC-902) Mirror tape
• Cautions on adjusting
(1) Before adjusting, clean the head surface, capstan and
the pinch roller with a gauze or a cotton swab moisten¬
ed with alcohol.
(2) Demagnetize the R/P HEAD and the E. HEAD with a
head eraser.
(3) Completely demagnetize the adjustment screwdriver.
(4) Unless instructed otherwise, set the various controls
as follows:
— INPUT volume. maximum
— OUTPUT LEVEL volume. maximum
- DOLBY NR switch .OFF
-MONITOR switch.TAPE
1. T ape Transport Check
Load the transport check cassette. In the operational
mode, illuminate the fixing guides of the R/P HEAD
with a lamp and check to make sure the tape edge does
not come in contact with the tape guide section.
The tape transport is the most important element in de-
terming the performance of a cassette deck.
Avoid moving the various adjustment screws, nuts, etc., as
much as possible. The THG-801 Tool Plate is a tool used
primarily for precisely adjusting the height of the tape
guide attached to a tape head.
This tools is indispensable in repairing various heads, when
replacing heads, and for design purposes, in order to deter¬
mine the location measurements for mechanical attach¬
ments.
Even when the height of the tape guide is accurately meas¬
ured, during actual tape play, the tape may sometimes
warp.
This is due to slight errors in dimensions of those parts
which actually come in contact with the tape, such as cas¬
sette halves, heads, pinch-rollers, capstan shaft, etc. There¬
fore a mirror tape is used to confirm proper running of the
tape.
In this way, the THG-801 Tool Plate and mirror tape are
both used to insure good tape running.
f
After having confirmed that the setting is correct, the mir¬
ror tape may warp anyway. In order to establish the titlt
angles of the recording/plaback head and the erase head,
adjust (by turning 1/4 - 1/2 turns) the level adjustment nut
(311) of the tape guide (103). Refer to the pages on
"Adjusting and checking the Mechanism Section" when
replacing or adjusting the R/P HEAD.
2. A d justing the Azimuth
(1) After completing the tape transport check load the
test tape (A-BEX TCC-153)
(2) Play back the test tape; adjust the azimuth nut so
that section A of the resurge wave form is maximum
and section B is minimum.
MTT-II4
3. C hecking and Adjusting the Tape Speed
1) Connect the frequency counter to the LINE OUT
terminal and load the test tape (SONY TY-224).
2} Playback a test tape. At about halfway through the
tape, where the tape transport is stable, adjust the
adjustment points on the back of the capstan motor
so that the frequency counter will have a reading with¬
in the the range of 3,000 Hz ± 6Hz.
HTT-m
4. A djusting the Input Sensitivity
(1) Set the MONITOR switch to SOURCE position, the
operational mode at STOP. Supply a 400 Hz signal
to the LINE IN terminal and set the input signal level
(approx. —18 dB) so that the output level at the LINE
OUT TERMINAL (L ch) becomes OdB.
DC motor
Adjustment
Points
Capstan motor
(2) At the same time, check to make sure the R ch output
level is also OdB.
REC Amp
5. A djusting Playback Section
(1) Adjusting the playback level
Play back the Dolby standard level test tape (A-BEX
TCC-130) and adjust RT-101 (L ch), RT-201 (R ch)
so that the LINE OUT voltage becomes 0 dB (0.775V).
(2) Adjusting the playback frequency response
Play back the test tape (A-BEX TCC-262) and check
to make sure that the frequency response meets the
specifications in the diagram.
(15)
>
I

t
*
K
6. Adjusting the FL Meter
After adjusting the playback level, playback the test tape
(A-BEX TCC-130) and adjust RT401 (L ch), RT402 (R
ch) so that the FL meter indicates OdB when the LINE
OUT terminal level is OdB (0.775V).
7. Adjusting the Recording Section
(1) A djusting the record/play back overall frequency
response.
1) Load the test tape HD7E/C60; record a signal with
an input level of—38 dB, 1 KHz at the LINE IN
terminal; play back this recording.
2) Change the frequency of the input signal to
12kHz, record and playback; adjust RT104(Lch),
RT204 (R ch) so that the characteristic standards
meet the following diagram when compared to the
1kHz signal output level.
Record/Playback Overall Frequency Response
Tape: H07E Dolby: off
Level: —20dB from Dolby.
(16)
(2) Adjusting the record/pi ay back levels
1) Load the test tape HD7E/C-60 and record a signal
of 1kHz (-38 dB).
2) Adjust RT102 (L ch), RT202 (R ch) so that the
output level is the same when the MONITOR
switch is switched from SOURCE to TAPE
position.
(3) Checking the Dolby C record/playback overall fre¬
quency response
1) Set the DOLBY NR switch to the "C" position.
2) Using the test tapes DXM, HD7E/C-60.DX3H, per¬
form record/playback in the same manner as 7-(1).
3) Check to make sure that the record/playback
overall frequency response meets the specifications
in the diagram.
Dolby C Record/Playback Overall Frequency Response.
Tape: HD7E
Dolby: on, C
Level: — 20dB from Dolby
OOLBY-C m RE CORO/PLAY BACK
• Beat Interference
Beat interference may result if the unit is used close to an
AM tuner. In this case separate the distance between the
tuner and the cassette deck.
(17)

KU-5881 AUDIO PWB UNIT
Ref. No.
Part No.
Part Name Remarks
SEMICONDUCTOR GROUP
IC101,102,
201,202
JC3G1
(C302.303
IC304
IC305
TR101,106' 27301
201,206
TR306 27400:
TR307,308j 27302-
TR 102,202 27500-
TR 105,205 26900
TR301 -303
305,309
-311
TR 103. 203,
104, 204,
304
D301, 303
-305
RESISTOR GROUP
2630353002 I TEA0665
2630317006
2630257001
2630355000
2630354001
1 2730178022
2740036002
i 2730245023
2750048909
2690014006
M 5220P
M-5218P
AN6256
M PCI 297CA
2SC1740 (R/S)
2SD468 (C)
2SC2603E/F
2SK381 <D)/{E)
DTA124 XS
2690015005 DTC124 XS
2760049008 IS2076
vetmjtr-
OUTPUT VR
10KDA
8IAS FINE
ADJ. 500DB
SAL. VR
250KQB
INPUT VR
100KHA
P8 GAIN
lOOKfiB
REC CAL
22KftB
BIAS
CAPACITOR GROUP
C102.202
172,272
C101,201
C325
Cl 72.272
C141.241
Cl 63,263
C161,261
Cl 59,259
C155,255,321
Cl 40,240
C318
C306,307
310,311
Cl 74,274
C320
Cl 77,277,326
Ceramic
2533627000
CC45SL1H101J 100PF 50V
2533635005 CC45SL1 H221J
220PF 50V
2534355009
CC45SL2H050C
5PF
500V
2531055027 CK45B1H821K 820PF 50V
2531059007 CK45B1HI22K 0.0012mF
50V
2531005006
CK45B1 HI 52K
0.001 5mF
50V
2531060009
CK45B1 HI 82K
0.001 8mF
50V
2531006005
CK45B1H222K
0.0022mF
50V
2531007004
CK45B1H332K
0.0033mF 50V
2531062007
CK45B1H392K
0.0039m F 50V
2531023004
CK45F1H472Z
0.0047 M F
50V
2531024003 CK45F1H103Z
0.01 mF 50V
2539030060 CK45-1E103K
0.01 mF
25V
2539035007 CK45-1E123K
0.01 2m F
25V
2539030086 CK45-1E223K
0.022mF
25V
Ref. No.
Cl 76.276
Cl 09.209
114,214
Cl 44,244
149.249
Cl 65,265
Cl 73,273
Cl 06,206,119
219,138,238
317
Cl 56,256
309,319
Cl 04,204,108
208,115,215
118,218,143
243,150.250
153,253,154
254,303,304
305,312,313
314
Cl 64,264,301
302.315,316
148,24#
Cl 10,210,113
213.145.245
148,248
Cl 11,211,112
212.146.246
147,247
Part No,
2539030099
2539031001
Part Name
CK45-1E333K
CK45-1E473K
2539031001 CK45-1E473K
2539031014
2531054086
CK45-1E683K
CK45B2H391K
2544260045 CE04W1H010M
Remarks
0.033m F 25V
0.047m F 25 V
0.047tfF 25V
0.068mF 25 V
390PF 500V
Electrolytic
ImF 50V
2544258002
2544254006
CE04W1V4R7M 4.7mF 35V
CE04W1C100M IOmF 16V
2544252024
2544260016
CE04W1A470M 47 M F 10V
CE04W1HR22M 0.22mF 50V
2544228951 CE04W1HR68M
Cl 66,266 2551120026
Cl 39,239 2551120000
C107,207,116 2551120084
216,142,242
151,251
Cl 03,203 2551120097
Cl 57,257 2551121009
Cl 05,205 2551121012
Cl 17,217 2551121025
152,252
C322 2554078081
CQ93M1 HI 52J
CQ93M1 HI 02J
CQ93M1 H472J
CQ93M1H562J
CQ93M1H682J
CQ93M1H822J
CQ93M1 H103J
2554078081 CQ93P2A562J
0.68mF
Film
0.001 5mF 50V
O.OOImF 50 V
0.0047 M F 50V
0.0056mF 50V
0.0068mF 50V
0.0082mF 50V
0.01 M F 50V
0.0056mF 100V
OTHER PARTS GROUP
LI 01,201 2310825009
LI 02.202 2358011008
104,204
LI 03,203 2320102000
LI 05,205 2350020000
LI 06,206 2328044005
LI 07,207 2390010009
L301
T301
S301
J301
J302
CN301
CN302
CN303
2390010009
2350019011
2398024000
2124611001
2048047007
2048114008
2050233045
2050233061
2050233090
BIAS FILTER
INDUCTOR
MPX FILTER
INDUCTOR 682J
BAND TRAP FILTER
HX STEP UP COIL
INOUCTOR 122J
OSC COIL
PUSH SWITCH
H/P JACK
4P PIN JACK
4P EH CONNECTOR BASE
6P EH CONNECTOR BASE
9P EH CONNECTOR BASE
The carbon resistors rated at %W are not listed herein.
KU-5871 POWER LOGIC UNIT
Ref. No.
Part No.
Part Name
Remarks
SEMICONDUCTOR GROUP
1C1 2620674005 mPD7506C-069
IC2.3 2620447009 BA6109U1
IC4 2620635007 LUS9001
IC5 2620730004 HD74HC238
IC7,8 2620729002 HD74HC08
IC401.402 2620440006 BA6146
IC403 2620580005 M PD554C-136
IC451 4990049009 R M-577
TR1 2740036002 2SC468 (C)
TR2 2740078031 2SD882 (Q/P)
TR3.9.13 2730178022 2SC1740(R/$)
TR4 2720055029 2SB772 (Q/P)
TR5, 14 2710183927 2SA933 (R/S)
2710105002 2SA966 (Y)
2690022904 DTA143ES
2690015005 DTC124XS
IC403
IC451
TR1
TR2
TR3.9.13
TR4
TR5, 14
TR6
TR7, 12
TR8. 11
451
TR15
TR401
-404
TR405
XT1
D1-10
Oil
D12-26
401,402
451-456
ZD1,2
ZD3
4.7K-4.7K
22K-47K
2630188002 mPC78L05
2730178022 2SC1740 (R/S)
2690029907 RN1204
2610037005 CSB455E
2760433009 DSM1A2
2760049011 1S2076A
2760049008 1S2076
Ref. No.
Cl 9
C407
M, fi
Cl. 9
408
C403.406
C4, 7
C13
CIO, 11
C16,17
20
C401,404
C45
C46
C2,44
C402.405
Cl 5
C5,8
C14
Cl 2
Part No.
2544250055
2544252943
2544254006
2544254019
2544254938
2544163003
2544256033
2544258002
»
2544258002
2544172007
2544166042
2544260045
2544260058
2544254080
2544197008
2544255018
2544258086
Part Name
CE04W0J471M
CE04W1A221M
CE04W1C100M
CE04W1C220M
CE04W1C470M
CE04W1C221M
CE04W1E470M
CE04W1V4R7M
CE04W1V4R7M
CE4W1H0R1M
CE04W1HR33M
CE04W1H010M
CE04W1H2R2M
CE04W1C102M
CE04W1C222M
CE04W1C472M
CE04W1V471M
Remarks
Electrolytic
470mF 6.3V
220mF 10V
iqy
IOmF 16V
22mF 16V
47mF 16V
220mF 16V
47mF 25V
4.7mF 35V
4.7m F 35V
0.1 mF 50V
0.33mF 50V
IMF 50V
2.2mF 50V
IOOOmF 16V
2200mF 16V
4700mF 16V
470mF 35V
47K-47K
2760052085 HZ11A-3
2760249015 HZ18-3
2760236057 HZ5C-3
2760254000 HZ7B-3
2760218046 HZ9B-1
2760299007 HZ3C-2
RESISTOR GROUP
LE453
SW451
—458
L401
CN1
CN2
CN3
CN401
CN402
iRTS GROUP
4710253013
RADIATOR
3939355001
LN224RP (LS) (RD)
3939354002
LN424YP (LS) (AMBER)
3939352004
LN324GP(LS) (GN)
2124388004
TACT SWITCH
2358014034
INDUCTOR
3939357009
SLR-56VR3H
2050233061
6P EH CONNECTOR BASE
2050233087
8P EH CONNECTOR BASE
2050233074
7P EH CONNECTOR BASE
2050233090
9P EH CONNECTOR BASE
2050233045
4P EH CONNECTOR BASE
3934010008
Ft METER
4410667107
METER HOLDER
2050243035
3P WIRE HOLDER
2050243064
6P WIRE HOLDER
2050243080
8P WIRE HOLDER
2050243093
9P WIRE HOLDER
2050243048
4P WIRE HOLDER
2050243051
5P WIRE HOLDER
2050243048 5P WIRE HOLDER
2050243048
4P WIRE HOLDER

Ref.
No.
Part No.
Part Name
201
4118341903
CHASSIS
4118341916
CHASSIS
202
KU-5871
PWR LOGIC PWB ASS'Y
203 KU-5881
AUDIO PWB ASS'Y
204
KU-58712
CONTROL PWB ASS’Y
205
KU-58711
COUNT/METER P. ASS’Y
206
1030913108
FRONT ESC ASS'Y
1030913111
FRONT ESC ASS’Y
207
VM 861
CASSETTE MECHA
208
4118347101
EARTH PLATE (A)
209
4118383000
SHIELD LABEL
210 !
4118346225 i
ANGLE I
• 23^5336001
m%$&
w&mr wmmmmm
-fell £i§Pr •
t'lWfcAiB*^. -~ 1 *<&<i.vj(pKk££gHittMk 3 te air• ■■ •,- ~A . 1
212] 4118342627 JTRANS BRACKET ]
igp06»310p2
K/iaSOTgEW'.ft
ftofeekrcl
■ ■ jgjLyfc .*»4|>p||^ • -"#4* l ASr-i/Lj*
m214l 4450056008;
^2151
iWQ
■ •ssyisisfjj
Fbush
•'.a* T|,* ^
216; 4118343302 POWER SW BRACKET
217 | 4618130009 CUSHION (A)
218| 1058089108 BOTTOM COVER
219] 4610162004 FELT PAD
220 1430460109 METER WINDOW
221 i 1290065210 COLOR FILTER
i
222 | 1130802106 PUSH KNOB (A)
1130802119 PUSH KNOB (A)
223 | 3934010008 FL METER
224| 2124388004 TACT SWITCH
225! 1130805006 PUSH BUTTON {A)
j 1130805019 PUSH BUTTON (A)
226! 1130806005 PUSH BUTTON (B)
1130806018 PUSH BUTTON <B)
227 2090110018 EARTH WIRE
EP-4772 CORD HOLDER
4318098108; PUSH SW LEVER
4310220107 1 P.S. LEVER ASS'Y
4310220110: P.S. LEVER ASS'Y
4310217000 1 EJECT KNOB
4310217013! EJECT KNOB
4318104102! EJECT PLATE
1441480220 ' FRONT PANEL ASS'Y
i
1441480217 FRONT PANEL ASS'Y
KU-58715
1120484204 VOL KNOB (A)
1120484217 VOL KNOB (A)
1120485009 VOL KNOB IB)
1120485012 VOL KNOB (B)
tei
§||!
ipi
HpKj
m&4,
REMOTE SENS. P. ASS'Y
241
242
243
244
245 •
246 |
247 !
248
250
251
252
253
254 !
255 j
257 |
258 !
A 259
A 2 60
A 261
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
1030919102
1030919115
4110564115
1028319280
1028319248
4770224031
4410667107
KU-58714
KU - 58811
4410668009
4458004007
1338085000
4458028009
2124611001
2123315023
2048114008
2110474003
2110470007 j
2048047007 \
2110472005 j
2110471006 !
2129136028
2020022008
2061031045
4737500015 j
4737501001
4713303016
4737002005
4737004003
4737002018 |
4737003004
4737500044
4737503038 j
4713305014
4751106042 i
C WINDOW
C WINDOW
C WINDOW ESC
TOP COVER
TOP COVER
SP WASHER
METER HOLDER
LED PWB ASS'Y
VR PWB ASS'Y
VOL PLATE
WIRE CLAMPER
REMOTE COVER LABEL
CORD HOLDER
PUSH SWITCH
VOLTAGE SELECTOR
4P PIN JACK
VI620 V30KA 104R
VI620 V20 FA103
H/P JACK
V16 V20FB 501 K
INPUT VR
OUTPUT VR
BIAS VR
mm
V16 V20F8 254- BAL. VR
POWER SW
FUSE HOLDER :
FUSE (0.25)A
3x8 CBTS (P)-2
3x10 CBTS IP)-2
3x6 CBS-2
3x6 CBTS (S)-2
4x8 CBTS (S)-2
3x8 CBTS IS)-2
3x8 CFTS IS)-2
3x8 CBTS |P)-B
4x10 CFTS (P) BK BK
3x10 CBS-2
WASHER
4737503041 4x10 CTTS (P) Nl
4730359014 3x16 CBRTS
WARNING:
Parts marked with and/or shading have special characteristics
important to safety. Be sure to use the specified parts for replace¬
ment.
Remarks symbols in the parts list refer to the following countries
and areas.
EA: Australia
EK: United Kingdom
EU: U.S.A.
El : Multiple voltage model
E2 : European continent
* Remarks symbols IBK) in the parts list means that the color of the
front panel is Black.
\
i

r i
EXPLODED VIEW OF CABINET AND CHASSIS GROUP

r
EXPLODED VIEW OF MECHANISM VM861 UNIT

KU-5890 MECHANISM P.W.B UNIT
--
Ref. No.
—
Part No.
Part Name
... .
Remarks
R901
R902
i
1
_
2412332047
2412332005
2123331308
2129201005
3939178000
3939026000
2042167006 j
2050185067
i
1
RD14B=*331J
R 0148**221J
ROTARY ENCODER
SLIDE SWITCH
LN25RCP
PN150
7P EH CON. CORD
6P WIRE HOLDER
330D
2200
• The carbon resistors rated at V *W are not listed herein
ACCESSORIES GROUP
Ref,
No.
’ -
Part No.
Part Name
Remarks
♦
2032101001
5111457000
5111456001
^263364700?
2P CONNECTOR CORD
INST. MANUAL
INST. MANUAL
1 PLUG
EU only
FUNCTION OF REMOTE CONTROL 1C
• Remote Control 1C LU59001
CARTON CASE GROUP
Ref.
No.
Part No.
1 1 1 ’
Part Name
Remarks
•
5011108019 j
CARTON CASE
5038054104
PACKING
5058092007 j
LAMINATE ENVELOPE
WARNING:
Parts marked with and/or shading have special characteristics
important to safety. 8e sure to use the specified parts for replace¬
ment.
Remarks symbols in the parts list refer to the following countries
and areas.
EA: Australia
EK: United Kingdom
EU: U.S.A.
El: Multiple voltage model
E2 : European continent
* Remarks symbols (BK> in the parts list means that the color of the
front panel is Black.
Terminal
No.
Function
Terminal
No.
Function
1
Data output.
11
Remote control code input.
2
Data output.
Receivers code from RM557.
3
Data output.
12
System address, ground.
4
Data output.
13
System address, ground.
5
Data output.
14
System address, ground.
6
455 kHz osc.
15
System address, +5V
7
455 kHz osc.
16
Data output.
8
Ground. 17
Data output.
9
ACL (Auto Clear). Receivers High (+5V) from
18
System address, ground.
TR8 for 2.5 sec. at the time of
19
Data output.
10
turning the power on, normally Low (OV).
Ground
20
V o d . + 5 V
• Table of LU59001 Data Output _
Date of LU59001 when "KEY IN" by remote control. Note: 0: OV
1: 5V
Terminal No. of LU59001
Key of Remote Control
(RC-101)
26 FF »
12
i
14 15 18
i I I
System Address
13
1
1
1
2
1
4
1
Data
5
1
16
1
17
1
19
1
Expand
3
1
Data
Cl C2 C3
C4
C5 C6 C7
C8 C9
CIO
C11
Cl 2 C13
0 0 1 0
0 0 1
0 1
1
0
1
0
27 REW
0 0
1
0 0 1
1
0 1
1
0
1
0
28 PLAY
►
0
0 1
0
0
0 0 1
1 1
0 1
0
29
PAUSE
II
0
0 1 0
0 1
0 1
1 1
0 1
0
30
STOP
■
0 0
1
0 0 0
1 1
1 1
0
1
0
31
REC •
0 0
1 0
0 1 1
1 1
0
1
0
-^-
Input
• V ’ * —
Output
PARTS LIST OF CASSETTE MECHANISM EXPLODED VIEW
1 Ref.
! No.
j—___
Part No.
Part Name
Remarks
j 1
4118229436
MECHA BASE ASS'Y
i 3
4318076405
HEAD SLIDER ASS'Y
4
4310218203
HEAD PLATE ASS'Y
; 5
4256011003
STEEL BALL ASS T
6
4318080200
j BALL GUIDE PLATE
7
! 4638230002
1
j SPRING
i 8
j 3918825002
ERASE HEAD
i
9
j 3918076107
R/P HEAD
i
10 | 4438671104
SPECIAL NUT
11
| 4418994102
CORD HOLDER
12
4428165002
SLIDER SPACER
13
4638842005
SPRING
| 14
2124621004
LEAF SWITCH
! 20
; 4338224208
STOPPER
21 4610154083
CUSHION
23
4338194105
P ROLLER ARM ASS'Y
24
4638231108
SPRING
25
4218400003
REEL SSS'Y
26 4638261000
SPRING
27
4338199003
FRICTION PLATE
28
4630483006
SPRING
29
4330449104
1. ARM(B)G ASS'Y
35
4338236209
IDLER ARM(A) ASS'Y
36 4638271003
SPRING
37 2178069007
DC MOTOR
38 4218403000 PULLEY
39
4418962406
DC MOTOR F i X PLATE
40
4318081500 BRAKE
41
4618127106 BRAKE SHOE
42 4638234105
SPRING
43
4338232203
BRAKE ARM ASS'Y
44
4438648302
METAL HOUSING ASS'Y
45
4210389009
FLY WHEEL ASS'Y
47
4122025008
BACK PLATE
50 4770090074
WASHER
52
4418966208
CAM MOTOR HOLDER
53
2178070009
DC MOTOR
[
54
4248025607 j
WORM GEAR
55 4248027401 j CAM
56 4140414002 j
OIL FENCE
57
4428018308 ENCODER BRACKET
58 i
4338225304 j
HOLE SENSOR (1)
59 4338226400 j
HOLE SENSOR (2)
62 4428147509 j RIGHT STAY ASS'Y
63 4428145200 ! LEFT STAY ASS'Y
68
1030922209 CASSETTE BOX
69 4330459204 j
CASSETTE BOX HOLDER
72 4318097002 i COLLAR
73 4638236116|
BOX SPRING
74 4698013104|
AIR DUMPER
76 ! 1448508613 j
ESC PLATE
77
393917901 2 i
[
LN0105 YP4(YW)
78 4458028009 1
CORD HOLDER
79
KU-51000 |
E HOLE SENS PWB ASS'Y
80
2123331308
ROTARY ENCODER
81 3939178000
LN25RCP
Ref.
No.
Part No.
Part Name
Remarks
82
3939026000 PN150
83
2129201005 SLIDE SWITCH
84
KU-58901
R PULSE SENS PWB ASS'Y
101 4490030107
E HEAD BASE
102 4638621103
SPRING
103
4338193009
TAPE GUIDE
104
4338196103
P. ROLLER ARM-L ASS’Y
1
1
105
4338198101
P. ROLLER ARM PLATE
I 106
4630480009
SPRING
| 109 4638234105
SPRING
f 111
4218365504
CAPSTAN WHEEL ASS’Y
112 4238028108 BELT
113
4238030013 BELT
150
4638819012
SPRING
j 152
2178034105 C P MOTOR
1 153
4218383007
MOTOR PULLEY
r 154
4258058004
WASHER
j 155 4770090016
WASHER
f 158
KU-5890 2
ENCODER PWB ASS'Y
1 171
4438818006
SPECIAL NUT
| 172 4228175001
CAPSTAN JOURNAL(I)
173
4228176107
CAPSTAN JOURNALS)
174
4638640100
SPRING
200
4638829303
CASSETTE SPRING
201 4428154107
C P SUPPORT
203
4338269409 HOOK
! 204
4638256002
SPRING
i 205
4128829004
ANGLE
■ 206
4638257001
SPRING
[ 208
1038243304
CASSETTE SUPPORT!L)
209 1038243317
CASSETTE SUPPORT(R)
1 210
4338271303
DAMPER GUIDE
| 301 4377002005
3x6 CBTS(S)-Z
302 4737500028
3x8 CFTS(P)-Z
307
4713202010
2.6x5 CBS
310
4713802025
2.6x14 CBS
311
4756020000 2N
313
4713201011
2.6x4 CBS-Z
314
4770090003
WASHER
317
4751121108
SLIT WASHER
318
4737500002
3x6 CBTS{P)-Z
319
4761114008
1.5E RING
320 4713802012
2.6x3 CBS-Z
321
4751120109
SLIT WASHER
322 4713801039
2x3 CBS-Z
323
4761003009
3E RING
327
4730154028
2x8 CRTS(P)-Z
328
4751005004 4W
329
4751139006 2.1 W
330
4761002000
2.5E RING
331
4761001001
2E RING
(23)
A
I

SCHEMATIC DIAGRAM OF AUDIO AMP UNIT
»
A
t
B
C
4
D
c
E
*
• This circuit diagram shows the basic circuit. It is subject to j
change for the purpose of improvement. j
I
( 2 4 )

SCHEMATIC DIAGRAM OF POWER/LOGIC UNIT
TO AUDIO PWB
ASS'Y
W403
■ ■
r ^
r-i-i-i. .-.ill
^ _
TO
COUNT/METER
P. ASS'Y
POWER SW PWB ASS"4
KU-587 *3
Note:
Resistance shall be 1/4W unless otherwise specitied and the
unit is Cl.
The unit of capacitor is fj.F, P is pF unless otherwise specified.
This circuit diagram shows the basic circuit. It is subject to
change for the purpose of improvement.
Parts marked with ZiA are of importance in respect to the
safety, use the specified type without fail.
POWER
TRANSFORMER
Multi voltage models
POWER SWITCH
—f-0*^
F5I
POWER
TRANSFORMER
European models
POWER
Canadian models
A
R51 , C51
120 '0.01/400
'• (1/2W1 :
POWER SW PWB ASS Y
KU-5870
AC2
mm, ....
♦ ACI20V
MAC220V
TC240V.
A POWER SWITCH
A A
I .. " . - i W* " ■■ ■ ■ |f— ■
. R5f : V
’20 &01/400
, (1/2W) ; ■ ■
A
*
AC220V
AC240V
POWER SW PWB ASS'Y
KU~587*3 ^
AC2
( 2 6 )

I
P.W. BOARD OF KU-5881 AUDIO AMP UNIT
4
1
5
1
6
l
7
8
»
4
( 2 5 )
4

8
B
FROM
AUDIO PWB
ASS'Y
D
, E
PWR LOGIC
PWB ASS'Y
S6)
P (Ll2)
§
P
(Ltt)
3)
P
(LlO)
IG
s
P
(L9)
5y
P
(L8)
50)
P
(L7)
V3)
P
(Rl2)
*8)
P
(Rn)
*7)
P
(Rio)
P
(R 9 )
*5)
P
(Re)
P
(R 7 )
53)
P
(Re)
26) NC
H P (Li )
2$ P (L2)
P <L3>
0P (L4)
2p!G
0P (L5 )
§)P (L6)
(Xl )
rnp (X 2 )
5
®2G
UJ
1§NC
>
id
@P (h)
0
<C
13) P (g)
£
§)3G
cn
UJ
")P (f)
i—
mmm
® P (e)
z
8
S 4 G
0
Snc
\
£T
K P (d)
UJ
I—
S 5G
UJ
5)p (c)
LL
^P (b)
Sp (a)
TO
CONTROL PWB ASS'Y
Note:
Resistance shall be 1/4W unless otherwise specified and the
unit is H.
The unit of capacitor is F, P is pF unless otherwise specified.
This circuit diagram shows the basic circuit. It is subject to
chancje for the purpose of improvement.
( 28 )