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Model
CMT-SP55TC TC-SP55
Pages
24
Size
1.97 MB
Type
PDF
Document
Service Manual
Brand
Device
Audio
File
cmt-sp55tc-tc-sp55.pdf
Date

Sony CMT-SP55TC / TC-SP55 Service Manual ▷ View online

9
4-1-4. TC REC START POINT
Procedure:
1. Set the test mode, and press the  REC  button (TC) and then the H  button (TC) to set the recording state.
2. Pressing the  CD SYNC REC  button (TC) returns to the starting point of recording.
SECTION  4
TEST MODE
4-1.
TEST MODE FOR NOT CONNECTING THE WHOLE SYSTEM
(When connecting TA-SP55,ST-SP55,TC-SP55)
4-1-1. SETTING THE TEST MODE
Procedure:
1. When the power ON, press the  ?/1  button (TA) while pressing the  s  button (TC) and  CD SYNC REC  buttons (TC) together.
2. When the test mode is set, the PAUSE LED will light up for 0.1 seconds at intervals of 3.2 seconds.
3.  To exit the  test mode, either press the  ?/1  button (TA) and turn OFF the power.
4-1-2. TC AGING MODE
Procedure:
1. After setting the test mode, press the  H  button (TC).
2. Operations are performed in the following sequence during aging.
REW
(Shut off)
"TAPE AG-1"
FWD
FF
REV
REW
(20 sec)
"TAPE AG-2"
(20 sec)
"TAPE AG-3"
(20 sec)
"TAPE AG-4"
(20 sec)
(20 sec)
(20 sec)
"TAPE AG-5"
FF search
REW search
OPEN
CLOSE
"TAPE AG-6"
"TAPE AG-7"
"TAPE AG-8"
"TAPE AG-9"
4-1-3. TC AMS CHECK
Procedure:
1. After setting the test mode, pressing the  s  button (TC) and then the  CD SYNC REC  button (TC) will start REW operations.
2. After rewinding to the tape top,FF search in the FWD direction starts.
“TAPE EDG*” will be displayed.(*: Arbitrary number)
3. After FF searching to the tape end, the tape will be automatically stopped, and “TAPE OK” or “TAPE NG” will be displayed.
10
4-2.
TEST MODE FOR CONNECTING THE WHOLE SYSTEM
4-2-1. TC Aging Mode (Connecting The Whole System)
• Mode for repeating operations of the CD player and TC deck automatically.
When errors occur:
Aging stops and a message indicating that an error has occurred such as “CD MEC ERR” is displayed.
(For details of errors, refer to “Error History Display Mode”.)
When no errors occur:
Aging is repeatedly performed.
Procedure:
1. Load any CD and a tape.
2. Select the function “CD” using the  FUNCTION  knob(TA) .
3. While pressing the  TUNING MODE  button (ST) and  H  button (CDP), press the  ?/1  button (TA).
4. “AGING” is displayed on the fluorescent display tube briefly.
5. Operations are performed in the following sequence during aging.
Every pressing of  DISPLAY  button (ST) changes the display in the CD display and TAPE display.
Reading of TOC
Playback of first track (3sec.)
Playback of last track (3sec.)
CD tray open
CD tray close
CD :
Cassette :
REW
(Shut off)
“TAPE AG-1”
PLAY
FF
REV PLAY
REW
(20 sec)
“TAPE AG-2”
(20 sec)
“TAPE AG-3”
(20 sec)
“TAPE AG-4”
(20 sec)
“TAPE AG-5”
FF search
REW search
OPEN
CLOSE
(20 sec)
“TAPE AG-6”
(20 sec)
“TAPE AG-7”
"TAPE AG-8"
"TAPE AG-9"
6. To end aging, execute the cold reset.
11
3.04 – 6.96 N • m
(31 to 71 g • cm)
(0.43 – 0.98 oz • inch)
0.20 – 0.58 N • m
(2 to 6 g • cm)
(0.02 – 0.08 oz • inch)
3.04 – 6.96 N • m
(31 to 71 g • cm)
(0.43 – 0.98 oz • inch)
0.20 – 0.58 N • m
(2 to 6 g • cm)
(0.02 – 0.08 oz • inch)
6.97 – 14.02 N • m
(71 to 143 g • cm)
(0.98 – 1.99 oz • inch)
0.98 N • m or more
(100 g or more)
(3.53 oz or more)
0.98 N • m or more
(100 g or more)
(3.53 oz or more)
CQ-102C
CQ-102C
CQ-102RC
CQ-102RC
CQ-201B
CQ-403A
CQ-403R
Precaution
1. Clean the following parts with a denatured alcohol-moistened
swab:
record/playback heads
pinch rollers
erase head
rubber belts
capstan
idlers
2. Demagnetize the record/playback head with a head demagne-
tizer.
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 sup-
ply voltage unless otherwise noted.
Torque Measurement
SECTION 5
MECHANICAL ADJUSTMENTS
Mode
FWD
FWD
back tension
REV
REV
back tension
FF/REW
FWD tension
REV tension
Torque meter
Meter reading
SECTION 6
ELECTRICAL ADJUSTMENTS
2. Turn the adjustment screw and check output peaks. If the peaks
do not match for L-CH and R-CH, turn the adjustment screw so
that outputs match within 1 dB of peak.
Record/Playback Head Azimuth Adjustment
Procedure:
1. Mode : FWD playback
Tape
Signal
Used for
P-4-A100
WS-48B
P-4-L300
10 kHz, –10 dB
3 kHz, 0 dB
315 Hz, 0 dB
Azimuth Adjustment
Tape Speed Adjustment
Level Adjustment
tast tape
P-4-A100
(10kHz, –10dB)
set
AUX OUT
(on ST-SP55)
47k
level meter
L-CH
peak
R-CH
peak
screw
position
output
level
within
1 dB
L-CH
peak
R-CH
peak
screw
position
within 1dB
0 DB=0.775V
Note: Before starting the adjustment, measure performance of the
machine.  Perform adjustment only when the measured
performances do not satisfy the specifications.
1. Demagnetize the record/playback head with a head demagnetizer.
2. Do not use a magnetized screwdriver for the adjustments.
3. After the adjustments, apply suitable locking compound to the
parts adjusted.
4. The adjustments should be performed with the rated power supply
voltage unless otherwise noted.
completed before performing recording circuit adjustment.)
5. The adjustments should be performed in the order given in this
service manual. (As a general rule, playback circuit adjustment
should be completed before performing recording circuit adjust-
ment.)
6. The adjustments should be performed for both L-CH and R-CH.
7. Switches and controls should be set as follows unless otherwise
specified.
12
3. Phase check
Model: FWD playback
test tape
P-4-A100
(10kHz, –10dB)
R-CH
L-CH
set
47kW
47kW
oscilloscope
AUX OUT
(on ST-SP55)
V
H
4. Perform steps 1 to 3 in the FWD playback mode.
5. Confirm that phase error between L-ch and R-ch is in the range
of same phase to 90 degrees.
6. After the adjustments, apply suitable locking compound to the
parts adjusted.
Adjustment Location:
Waveform of oscilloscope
in phase
45
°
90
°
135
°
180
°
good
wrong
Tape Speed Adjustment
Procedure:
1. Insert the WS-48B into deck.
2. Press the  H  button of deck.
3. Adjust RV362 of the MAIN board so that the reading of the
frequency counter becomes 3000 ± 90 Hz.
Adjustment Location: MAIN board
Sample Value of  Wow and flutter
W.RMS (JIS) less than 0.3%
(test tape: WS-48B)
test tape
WS-48B
(3kHz, 0dB)
set
AUX OUT
(on ST-SP55)
level meter
Adjust RV211 (L-CH) and RV261 (R-CH), so that adjustment within
the following adjustment level.
Adjustment level:
AUX OUT level: –8.2 
± 0.5 dB (285 to 319 mV)
Level difference between the channels: within 
± 1.0 dB
Confirm that the AUX OUT level does not change even though
play and stop are repeated.
Playback Level Adjustment
Procedure:
Mode: FWD playback
test tape
P-4-L300
(315Hz, 0dB)
set
AUX OUT
(on ST-SP55)
level meter
Record Bias Adjustment
Procedure:
1. Record mode.
AF OSC
AUX IN (on ST-SP55)
1) 315 Hz
2) 10 kHz
blank tape
CS-123
set
attenuator
600 
} 50 mV (–23.8 dB)
2. Playback mode.
3. Confirm playback the signal recorded in step 1 become adjust-
ment level as follows.
Note: You had better to refer “4-1-4. TC REC START POINT”
See page 9) when this adjustment
4. If these levels do not adjustment level, adjust the RV311 (L-CH)
and RV361 (R-CH), to repeat steps 1 to 3.
Adjustment level:
The  playback  outpout  of  10 kHz  level  difference  adjust
315 Hz reference should be 0 dB ± 0.5 dB.
recorded
position
set
AUX OUT
(on ST-SP55)
level meter
Adjustment scerw
(FWD mode)
Adjustment scerw
(REV mode)
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