Kyocera D-611 User manual

Service Manual
D-611 STEREO CASSETTE TAPE DECK
УҰИ ПИЦЦА АДЫ ЫЗ
(p,
KYOCERA

This symbol is intended to alert
you of the presence of uninsulat-
ed dangerous voltage within the
unit's enclosure that may be of
sufficient magnitude to constitute
a risk of electric shock.
This symbol is intended to alert
you of the presence of important
operating and maintenance
instruction in the literature
accompanying the unit.
CAUTION
RISK OF ELECTRIC SHOCK
BO NOT OPEN
CAUTION: TO REOUCE THE RISK OF ELECTRIC SHOCK
DO NOT REMOVE COVER (OR BACK)
NO USER-SERVICEABLE PARTS INSIDE
REFER SERVICING TO QUALIFIED SERVICE PERSONNEL
Dolby noise reduction system manufactured under license from
Dolby Laboratories Licensing Corporation. Dolby and the double-D
symbol are trademarks of Dolby Laboratories Licensing Coropration.

CONTENTS
Circuit Description
Adjustment Locations
Adjustments
Functional Block Diagrams
Schematic Diagrams
Controller
Wiring Diagram
Exploded View
Tape Transport
Parts List
PC Board Layout
Parts List (PC Boards)
Typical Specifications

CIRCUIT DESCRIPTION
(a) Power On/Off Reset Timing
0806 4
090!
(ceu) 9
STOP MODE |-————2500mS
|
[sons
PLAY
MODE
———
900ms
E
|
|
=
+B
5V
|
080!
|
|
| | | |
|
|
|
17V
|
|
|
|
|
1 | |
1
|
|
|
|
|
5у
|
ы
|
d
Y
|
x
|
| C
5
|
|
|
|
|
|
|
|
5۷
|
D
|
|
|
| |
|
|
|
| | |
:
عا󰾯
|
|
а
Ібт5
۴ وم هلا󰾯 | |
m
|
|
К-
10mS
|
x
5۷
6
POWER POWER
ON OFF
(1) At power turning on, the potential at U801 2/4 input rises in the time constant:
determined by R808 and C811, which in turn set its output to "L" at the threshold
point, thus finally providing the reset pulse signal for power turning on.
(2 At power turning off, the input for U801 4 turns to "L" which in turn reverses
its output to "H", By the descent of the U801 3/4 input in the time constant by R809,
a constant width pulse is achieved from its output at the threshold point, which is
reversed by U801 4/4 and becomes the resetting pulse at power turning off.

(b) Reel Motor Drive Circuit
Motor drive voltage: 6V at FF and rewind; 3.1V at play.
(1) FF: Pressing the FF key changes the potential at pin #30 of U901 from OV to 5V
and applies it to pin #6 of U902, and in turn turns on pin #10 to energize the motor.
The potential at pin #2 now is zero. |
e
(2
Rewind:
Pressing
the
REWIND
key
changes
the
potential
at
pin
#31
of
U901
from
OV
|
to
5V
and
applies
it
to
pin
#5
of
U902, and in
turn
turns
on
pin
£2
to
energize
the
motor.
The
potential
at
pin
£10
is
then
zero.
i
`
(3)
Playing:
Pressing
the
PLAY
key
changes
the
potential
at
pin
#37
of
U901
from
OV
"Í
to
5V
and
in
turn
turns
on
Q905,
which
changes
the
potential
at
pin
#10
of
U902
from
:
6V
to
3V.
(c) Assist Motor Drive Circuit
Motor drive voltage: 8V
Pressing each tape transport control key changes the potential at pins #29 and #28
from 0۷ to 5V and applies it to pins #5 and #6 pf U903, which in turn turns on pins
#2 and #10 to energize the motor.

(d) Automatic Stop Circuit
+В 5V +B i2V
HALL IC
As
the
reflector,
located
coaxially
onto
the
supply
reel,
revolves,
the
light
from
the
LED
frequently
switches
on
and
off
the
photo-transistor
and
causes
Q901
apply
a
clock
signal
to
pin
#23
of
U901.
When
the
reel
stops,
the
unit
selects
the
stop
mode.
(e) Mechanism Position Detection
3-bit data for mechanism position detection:
FF/Rewind Stop Pause/Cue Play
KO L L H L
Kl H L L H
K2 H H L L
H=5V; L=0V.

PSSW 329СОХ
PSRAOIICOX
ADJUSTMENT LOCATIONS `

ADJUSTMENTS
Equipment Required
1 Audio oscillator
2 Milli-voltmeter
3 Oscilloscope
4 Frequency counter
5 Distortion meter
6 Wow/flutter meter
7 Head demagnetizer
8 Test tape:
For test Tape Brand and No. Contents
Playback Level adj. TEAC MTT-150 400Hz, Dolby(R) level adjust.
Head azimuth TEAC MTT-114 10kHz, -10dB
Frequency resp. 3-point TEAC MTT-117SP 63Hz/1kHz/14kHz, -20dB
Freguency resp. 18-point TEAC MTT-256 3180 - 120usec, -20dB
Freguency resp. 18-point TEAC MTT-356 3180 - 70usec, -20dB
Wow/flutter TEAC MTT-111 3kHz, -10dB
Tape speed (Same as above.)
Crosstalk TEAC MTT-121 1kHz, -10dB
Separation TEAC MTT-141 1kHz, -10dB
ud AUTO SEARCH check cas 400Hz, -25dB
Ж Others TDK, AC-212 Normal use
| TDK, AC-512 Cr02 use
| TDK, ۸-1 Metal use
x Precautions:
To avoid the magnetization, do not apply DC current (even from circuit tester) to the
VIE heads.
To ensure an accurate alignment and not damaging test tapes, demagnetize the heads
before adjustments by using a demagnetizer.
Clean the heads before adjustments.
Observe the proper tape selection in accordance with the test tape used.
Preset the controls as follows:
MPX Filter - off,
DOLBY(R) NR - off,
Input - Line,
Record VOL - Maximum,
OUTPUT - maximum.
BIAS FINE - center.
The "unit" refers the D-611 deck.

1 Motor drive voltages
RED LEAD BLUE LEAD
Use circuit tester. The voltage across the motor terminals is:
3.0V+0.2V in play; 6.0V+0.2V in FF.
2 Dolby(R) NR
Test hookup:
LINE LINE
PSRAOIICOX OUTPUT
2 25.26
iC
4 7OIL/R в
SG
400Hz
mV OSCILLO
METER SCOPE
Level Meter Alignment
(1)
Load
a
cassette
tape
and
set
the
unit
to
the
recording/pause
mode.
(2)
Adjust
the
level
of
signal
generator
output
(400Hz)
for
540mV
reading
on
voltmeter.
(3)
Adjust
the
potentiometers
below
so
that
the
OdB
[double-D
mark]
red
LED
lights
up
faintly
for
each
channel.
|
Left channel; ۳۷6061 [PSRA011C0X board]
Right channel; RV606R

Dolby(R) NR Encode Boost
1 Connect voltmeter across TP1 and ۰.
2 Use the oscilator output frequency of 5kHz for Dolby(R) B-type and
1kHz/700Hz/20kHz for Dolby(R) C-type.
3 Set the Dolby(R) NR to on.
4 Check the voltmeter reading on the following table (0dB=580mV):
B-type (Test f=5kHz): C-type C-type
(Test f=700Hz) (Test f=1kHz)
Input Voltmeter Voltmeter Voltmeter
Level Reading Reading Reading
OdB OdB (580mV) --- ---
-10dB = --- ---
-20dB == === -14.4dB*2dB
-25dB
-19.6dB*1.5dB
===
===
-30d8
---
-18.2dB*2dB
---
-40dB -30.0dB*1.5dB --- ады
-60dB can 25% -40.4dB*2dB
MPX Filter (19kHz)
(1) Use the same test setup as above, except adjusting the signal generator output
to 19kHz.
(2) Check the levels at MPX filter on and at off. The difference between them should
be greater than 30dB.
Playback Frequency Response
LINE
OUTPUT . Preset the control as follows:
OUTPUT control - maximum;
Dolby(R) - off; and
TAPE SELECTOR - NORMAL.
PSRAOIICOX
25.26
mV OSCILLO
METER SCOPE
PLayback Output Level
(1) Load test tape MTT-150 and,set the unit to play. This delivers a 400Hz audio
output at the LINE OUT outputs. |
(2) Adjust the potentiometers below so that voltmeter reads 580mV:
Left channel; RV601L [PSRAO11COX]
Right channel; RV601R
10