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Model
CMT-EP505 HCD-EP505
Pages
50
Size
3.71 MB
Type
PDF
Document
Service Manual
Brand
Device
Audio
File
cmt-ep505-hcd-ep505.pdf
Date

Sony CMT-EP505 / HCD-EP505 Service Manual ▷ View online

11
HCD-EP505
SECTION  4
MECHANICAL  ADJUSTMENTS
SECTION  5
ELECTRICAL  ADJUSTMENTS
Tape Speed Adjustment
Setting:
Function: TAPE
Procedure:
1. Playback WS-48B (tape center) in the FWD state.
2. Adjsut the volume in CAPSTAN/REEL motor so that the fre-
quency counter reading becomes 3,000 Hz.
Specified Value: 2,910 to 3,090 Hz
3. Confirm that the frequency at the beginning and that at the
end of tape winding are between 2,955 to 3,045 Hz.
Adjustment Location:
PRECAUTION
1. Setting
MEGA BASS switch : OFF
TAPE  DECK  SECTION
0 dB=0.775 V
Test tape
Type
Signal
Used for
WS-48B
3 kHz, 0 dB
Tape Speed Adjustment
frequency counter
test tape 
WS-48B
(3 kHz, 0 dB)
set
MAIN board
SPEAKER terminal (CN503)
+
47 k
CAPSTAN/REEL
motor
Tape Speed
Adjustment
Mode
Tension Meter
Meter Reading
FWD
CQ-403A
more than 100 g
(more than 3.53 oz)
• Tape Tension  Measurement
PRECAUTION
1. Clean the following parts with a denatured-alcohol-moistened
swab :
record/playback head
pinch roller
erase head
rubber belts
capstan
idlers
2. Demagnetize the record/playback head with a head demagne-
tizer. (Do not bring the head magnetizer close to the erase head.)
3. Do not use a magnetized screwdriver for the adjustments.
4. After the adjustments, apply suitable locking compound to the
parts adjusted.
5. The adjustments should be performed with the rated power
supply voltage unless otherwise noted.
• Torque Measurement
Mode
Torque Meter
Meter Reading
2.95 – 6.86 mN•m
FWD
CQ-102C
(30 – 70 g•cm)
(0.42 – 0.97 oz•inch)
0.15 – 5.39 mN•m
FWD
CQ-102C
(1.5 – 5.5 g•cm)
Back Tension
(0.021 – 0.076 oz•inch)
more than 5.89 mN•m
FF
CQ-201B
(more than 60 g•cm)
(more than 0.83 oz•inch)
more than 5.89 mN•m
REW
CQ-201B
(more than 60 g•cm)
(more than 0.83 oz•inch)
Sample Value of  Wow and Flutter: 0.3% or less W. RMS (JIS)
(WS-48B)
12
HCD-EP505
TUNER  SECTION
0 dB=1 
µ
V
[AM]
Setting:
Function
: TUNER
Band switch : AM
[FM]
Setting:
Function
: TUNER
Band switch : FM
• Repeat the procedures in each adjustment several times, and the
frequency coverage and tracking adjustments should be finally
done by the trimmer capacitors.
AM RF signal 
generator
30% amplitude
modulation by
400 Hz signal
Output level: as low as possible
Put the lead-wire
antenna close to 
the set.
+
level meter
set
32 
MAIN board
SPEAKER terminal (CN503)
FM RF signal
generator
22.5 kHz frequency
deviation by 400 Hz
signal
Output level: as low as possible
+
level meter
set
32 
0.01 
µ
F
MAIN board
TP (FM ANT)
MAIN board
SPEAKER terminal (CN503)
digital voltmeter
100 k
MAIN board
TP (FM VT)
TP (AM VT)
Ver 1.1
no mark : EXCEPT AEP, UK, Chinese models
<        > : AEP, UK, Chinese models
AM IF ADJUSTMENT
Adjust for a maximum reading on level meter
T401 <T406>
450 kHz
AM  FREQUENCY  COVERAGE  ADJUSTMENT
Adjustment Part
Frequency Display
Reading on Digital Voltmeter
L408
530 kHz
1.3 
± 0.1 V
<T402>
<531 kHz>
Confirmation
1,710 kHz
7.8 
± 0.5 V
<1,602 kHz>
<7.1 
± 0.5 V>
AM  TRACKING  ADJUSTMENT
Adjust for a maximum reading on level meter
L407 <T401>
603 kHz
TC402 <TC401>
1,404 kHz
FM  FREQUENCY  COVERAGE  CONFIRMATION
Adjustment Part
Frequency Display
Reading on Digital Voltmeter
Confirmation
87.5 MHz
2.4 
± 0.1 V <1.4 to 1.6 V>
Confirmation
108 MHz
6.8 
± 0.5 V <7.3 to 8.5 V>
FM TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter
TC401
106.1 MHz
(EXCEPT AEP, UK, Chinese models)
Adjustment Location: MAIN board (See page 14)
13
HCD-EP505
Adjustment Location and Connecting Points
– MAIN BOARD (Component Side) –
T402
AM Frequency
Coverage Adjustment
T406
AM IF Adjustment
AM Tracking Adjustment 
{
TC401 
T401
– MAIN BOARD (Conductor Side) –
TP
(FM VT)
TP
(AM VT)
TP
(FM ANT)
HCD-EP505
15
15
AM
RF AMP
AM
OSC
AM
MIX
L. P. F
FM/AM PLL
U403
FM/AM PLL
U402
AM/FM
IF BUFFER
DECODER
• SIGNAL PATH
: FM
: AM
X401
7.2MHz
AMIN
IFIN
IF OUT
FM/AM
IO1
AOUT
AIN
FMIN
20
1
14
13
18
SWALLOW
COUNTER
UNIVERSAL
COUNTER
CCB
INTERFACE
REFERENCE
DIVIDER
UNLOCK
DETECT
12 BIT
PROGRAMMABLE
DIVIDER
PHASE
DETECTOR/
CHARGE PUMP
SHIFT REGISTER & LATCH
1/2
DI
CL
CE
DO
DA IN
STATION
STEREO
FM
ON/OFF
TU-L
R-CH
R-CH
EMP OUT
L IN
L OUT
EMP OUT
RCLK
RDATA
RCLK
RDAT
MUX
TU-R
CLOCK
PLL CE
DA OUT
PD
XIN
XOUT
3
4
2
5
11
BO1
6
10
17
16
• R-ch is omitted due
  to same as L-ch.
CN402
CN401
U401
FM TUNER PACK
CF401
T401
AM RF
T402
AM OSC
D405
VT
CF402
CF403
1
5
8
AMRF
AM-IF
FM-IN
FMDET
EMP IN
AM DET
AMMIX
OSC
RF IN
OSC
IF OUT
OSC OUT
OSC OUT
6
1
23
2
30
4
27
29
24
5
10
22
16
FMRF IN
FMIF
FMRF OUT
13
FM DET
1
AMRF IN
3
AM
OSC
8
AMOSC
BUFFER
20
FMOSC
15
AM/FM SW
7
AM/FMIF
BUFFER
FM
MIX
L OUT
R OUT
17
3
CE
DO
6
4
DI
20
XOUT
1
XIN
CL
5
CF401
9
11
AMIF
7
BO1
7
IFIN
20
AOUT
19
AIN
18
PD
FMIN
AM
MIX
CF404
CF406
TC401
DET
AM IF
AGC
CF404
FM
DET
FM IF
24
22
20
21
19
17
MUTING
13
14
TULED
6
STLED
7
BUFFER
Q405
4
16
2
X304
4.332MHz
RDS DECODER
IC305
FM/AM IF AMP, 
AM RF AMP/MIX/OSC,
FM/AM DET, MPX
U402
14
13
XI
XO
E
(Page 17)
A
(Page 18)
D
(Page 18)
B
(Page 17)
FM ANT
75Ω
COAXIAL
AM ANT
AM FREQUENCY
COVERAGE
T402
AM
TRACKING
L401, TC401
AM IF
T406
FMDET
9
T407
FM DET
L. P. F.
T404
L. P. F.
FM/AM BAND
SELECT SWITCH
Q404
BPF
BPF401
FM IF AMP
Q403
L407
AM RF
L408
AM OSC
D407
TC402
AM FREQUENCY
COVERAGE
L408
AM TRACKING
L407, TC402
FM TRACKING
TC401
TC401
PHASE
DETECTOR/
CHARGE PUMP
(AEP, UK)
(EXCEPT AEP, UK, CH)
(AEP, UK, CH)
FM/AM IF AMP, 
AM RF AMP/MIX/OSC,
FM/AM DET, MPX
U401
AM IF
T401
TU-L
R-CH
TU-R
DA IN
CLOCK
PLL CE
DA OUT
AGC
12
16
AMIN
15
BUFFER
Q404
STATION
STEREO
FM/AM BAND
SELECT SWITCH
Q403
FM OSC BUFFER
Q401
L. P. F
X401
7.2MHz
(AEP, UK, CH)
SECTION  6
DIAGRAMS
6-1.
BLOCK  DIAGRAM  – TUNER Section –
Ver 1.1
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