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Model
HCD-ZT4 LBT-ZT4
Pages
84
Size
3.76 MB
Type
PDF
Document
Service Manual
Brand
Device
Audio
File
hcd-zt4-lbt-zt4.pdf
Date

Sony HCD-ZT4 / LBT-ZT4 Service Manual ▷ View online

HCD-ZT4
17
SECTION  4
TEST  MODE
PANEL  TEST  MODE
This mode is used to check the fl uorescent indicator tube, LEDs, 
keys, [MASTER VOLUME] jog, [OPERATION DIAL] jog, mod-
el, destination and software version.
Procedure:
1. Press [
x
] button, [METER MODE] button and [DISC 2] but-
ton simultaneously.
2.  All LEDs and segments in fl uorescent indicator tube are lighted 
up. The POWER LED is lighted up in red color if the system is 
turned off and POWER LED is turn off if the system is turned 
on.
3.  When you want to enter to the software version display mode, 
press [DISC 1] button. The model information appears on the 
fl uorescent indicator tube. The message “GSL 2RS” appears 
on the fl uorescent indicator tude. Press [DISC 1] button again 
to view the destination information.
4.  During the destination information display, press [DISC 1] 
button. Each time [DISC 1] button is pressed, the fl uorescent 
indicator tube shows the version of each category software in 
the following sequence: SC, GC, SYS, CD, CDDM, CDMA, 
CDMB, BDA, BDB, ST, TC, TA, TM, MM1, MM2 (USB 
Micro computer) , MTR (METER) and return back to model 
information display.
5.  When [DISC 3] button is pressed while the version numbers 
are being displayed except model and destination, the date 
of the software creation appears. When [DISC 3] button is 
pressed again, the display returns to the software version dis-
play. When [DISC 1] button is pressed while the date of the 
software creation is being displayed, the date of the software 
creation is displayed in the same order of software version dis-
play.
6.  Press [DISC 2] button, the key check mode is activated.
7.  In the key check mode, the fl uorescent indicator tube displays 
“K 0 J0 V0”.
 
Each time a button is pressed, “K” value increases. However, 
once a button has been pressed, it is no longer taken into ac-
count. 
 
“V” value increases in the manner of 0,1, 2, 3 ... if [MASTER 
VOLUME] knob is turned clockwise, or it decreases in the 
manner of 0, 9, 8,7  ... if [MASTER VOLUME] knob is turned 
counterclockwise.
 
“J” value increases in the manner of 0,1, 2, 3 ... if [OPERA-
TION DIAL] knob is turned clockwise, or it decreases in the 
manner of 0, 9, 8,7  ... if [OPERATION DIAL] knob is turned 
counterclockwise.
8.  When [DISC SKIP/EX-CHANGE] button is pressed after all 
LEDs and segments in fl uorescent indicator tube light up, al-
ternate segments in fl uorescent indicator tube and LEDs would 
light up. If you press [DISC SKIP/EX-CHANGE] button 
again, another half of alternate segments in fl uorescent indica-
tor tube and LEDs would light up.  Pressing [DISC SKIP/EX-
CHANGE] button again would cause all segments in fl uores-
cent indicator tube and LEDs light up.
9.  To release from this mode, press three buttons in the same 
manner as step 1, or disconnect the power cord.
COMMON  TEST  MODE
This mode is used to check operations of the respective sections of 
Amplifi er and Tape.
To enter Common Test Mode
Procedure:
1. Press [
x
] button, [METER MODE] button and [DISC 3] but-
ton simultaneously.
2.  The CD ring indicators fl ash on the fl uorescent indicator tube. 
The function is changed to AUDIO and the volume is changed 
to VOLUME MIN.
Check of Amplifi er
Procedure:
1.  Press [EQ BAND] button repeatedly until a message “GEQ 
MAX” appears on the fl uorescent indicator tube. GEQ increas-
es to its maximum.
2.  Press [EQ BAND] button repeatedly until a message “GEQ 
MIN” appears on the fl uorescent indicator tube. GEQ decreas-
es to its minimum.
3.  Press [EQ BAND] button repeatedly until a message “GEQ 
FLAT” appears on the fl uorescent indicator tube. GEQ is set to 
fl at.
4.  When the [MASTER VOLUME] knob is turned clockwise 
even slightly, the sound volume increases to its maximum and 
a message “VOLUME MAX” appears on the fl uorescent indi-
cator tube.
5.  When the [MASTER VOLUME] knob is turned counterclock-
wise even slightly, the sound volume decreases to its minimum 
and a message “VOLUME MIN” appears on the fl uorescent 
indicator tube.
Tape function
When a tape is inserted in deck and recording is started, the func-
tion is changed to AUDIO.
To release from Common Test mode
Procedure:
1.  To release from this mode, press [
?/1
] button.
2.  The cold reset is enforced at the same time.
COLD  RESET
The cold reset clears all data including preset data stored in the 
EEPROM to initial conditions. Execute this mode when returning 
the set to the customer.
Procedure:
1. Press 
[
?/1
] button to turn on the system.
2. Press [
x
] button, [ENTER] button, and [
?/1
] button simulta-
neously.
3.  “COLD RESET” appears on the fl uorescent indicator tube. 
After that, the fl uorescent indicator tube becomes blank for a 
while, and the system is reset.
VACS  ON/OFF
This mode is used to switch ON and OFF the VACS (Variable At-
tenuation Control System).
Procedure:
1. Press 
[
?/1
] button to turn on the system.
2. Press 
[
x
] button, [DISC 2], and [DISPLAY] button simultane-
ously. The message “VACS OFF” or “VACS ON” appears on 
the fl uorescent indicator tube.
HCD-ZT4
18
TUNER  STEP  CHANGE 
The step interval of AM channels can be toggled between 9 kHz 
and 10 kHz. This mode is not available for Saudi Arabian, Euro-
pean and Russian models.
Procedure:
1. Press 
[
?/1
] button to turn on the system.
2.  Press [TUNER/BAND] button repeatedly to select the “AM”.
3. Press 
[
?/1
] button to turn off the system.
4.  Press [ENTER] button and [
?/1
] button simultaneously. The 
system turns on automatically. The message “AM  9K STEP” 
or “AM   10K STEP” appears on the fl uorescent indicator tube 
and thus the channel step is changed.
CD  SERVICE  MODE
This mode let you move the CD sled motor freely. Use this mode 
when you want to clean the optical pick-up.
Procedure:
1. Press 
[
?/1
] button to turn on the system.
2.  Press [CD] button to select CD function.
3. Press [
x
] button, [METER MODE] button, and [OPEN/
CLOSE] button simultaneously.
4.  The CD service mode is activated. The message “SERVICE 
MODE” appears on the fl uorescent indicator tube.
5.  With the disc in stop status, press [M] to move the optical 
pick-up to outside track, or press [m] to move to inside track. 
The message “SLED OUT” or “SLED IN” appears on the fl uo-
rescent indicator tube.
6.  To turn on or off the laser, press [>] button. The message 
“LD ON” or “LD OFF” appears on the fl uorescent indicator 
tube.
7.  To release from this mode, press [
?/1
] button.
CD  AGING  MODE
This mode can be used for operation check of CD section.
If an error occurs, the aging operation would stops and the status is 
displayed. If there were no error occurs, the aging operation would 
continue repeatedly.
Procedure:
1. Press 
[
?/1
] button to turn on the system.
2.  Select CD function.
3.  Load three discs on the disc tray.
4.  Press [PLAY MODE/TUNING MODE] button on the remote 
repeatedly to select the “ALL DISCS” mode, and press the 
[REPEAT/FM MODE] button on the remote repeatedly to se-
lect “REPEAT OFF” mode.
5. Press [
x
] button, [METER MODE] button and [DISC SKIP/
EX-CHANGE] button simultaneously.
6.  Aging operation is started.
7.  To release from this mode, press [
?/1
] button or disconnect the 
power cord to turn off the system.
•  Aging mode sequence:
CD  ERROR  CODE  MODE
Display the CD error code when an error occurred 
Procedure:
1. Press [
x
] button, [METER MODE] button and [DISC 1] but-
ton simultaneously to enter the error code display mode.
2. The 
fl uorescent indicator tube displays the number of total er-
ror.
3.  Each time [m] or [M] button is pressed, display change as 
below.
START (from
Disc 1)
Disc Chucking
TOC Reading
Play first track for 2
seconds
Play last track for 2
seconds
EX-CHANGE open/
close
Open the disc tray
Disc skip
Close the disc tray
Change the disc tray
HCD-ZT4
19
CD  REPEATS  5  LIMIT  OFF  MODE
The number of repeat for CD playback is 5 times when the repeat 
mode is “REPEAT ALL”. This mode enables CD to repeat play-
back for limitless times.
Procedure:
1. Press 
[
?/1
] button to turn on the system.
2.  Select CD function.
3. Press 
[x] button, [CD] button and [DISC 1] button simultane-
ously to enter the CD repeat 5 limit off mode and the fl uores-
cent indicator tube displays “LIMIT OFF”.
4.  To release from this mode, operate the cold reset. (Refer to the 
“COLD RESET”)
CD  SHIP  MODE (WITH  MEMORY  CLEAR)
This mode moves the optical pick-up to the position durable to 
vibration and clears all data including preset data stored in the EE-
PROM to initial conditions during the next AC-In. Use this mode 
when returning the set to the customer after repair.
Procedure:
1. Press 
[
?/1
] button to turn on the system.
2.  Select CD function.
3. Press 
[x] button, [DISC 1] button and [
?/1
] button simultane-
ously. The system turns off automatically.
4.  After the “STANDBY” blinking display fi nishes, a message 
“MECHA LOCK” is displayed on the fl uorescent  indicator 
tube and the CD ship mode is set.
CD  SHIP  MODE (WITHOUT  MEMORY  CLEAR)
This mode moves the optical pick-up to the position durable to 
vibration. Use this mode when returning the set to the customer 
after repair.
Procedure:
1. Press 
[
?/1
] button to turn on the system.
2.  Select CD function.
3.  Press [DISC SKIP/EX-CHANGE] button and [
?/1
] button si-
multaneously. The system turns off automatically.
4.  After the “STANDBY” blinking display fi nishes, a message 
“MECHA LOCK” is displayed on the fl uorescent  indicator 
tube and the CD ship mode is set.
CD  TRAY  LOCK  MODE
This mode let you lock the disc tray. When this mode is activated, 
the disc tray will not open when [OPEN/CLOSE] button or [DISC 
SKIP/EX-CHANGE] button is pressed. The message “LOCKED” 
will be displayed on the fl uorescent indicator tube.
Procedure:
1. Press 
[
?/1
] button to turn on the system.
2.  Select CD function.
3. Press [x] button and [OPEN/CLOSE] button simultaneously 
and hold down until “LOCKED” or “UNLOCKED” displayed 
on the fl uorescent indicator tube (around 5 seconds).
FACTORY  PRESET
This mode is use to load all the factory use preset frequencies into 
FM 1-FM 20 and AM 1-AM 10. Originally, frequency of FM 1-
FM 20 and AM 1-AM10 are set to the minimum frequency.
Procedure:
1. Press 
[
?/1
] button to turn on the system.
2.  Press [TUNER/BAND] button, [x] button, and [DISC 1] but-
ton simultaneously and the message “FACTORY” appears 
on the fl uorescent indicator tube. The function is changed to 
TUNER automatically.
4.  To clear the error record, operate the cold reset. (Refer to the 
“COLD RESET”)
5.  To release from this mode, press the [
?/1
] button or disconnect 
the power plug to turn off the system.
•  Display of total error
  
  EM**ED**
    EM** : The number of mechanical errors.
    ED** : The number of no disc errors after chucking the disc.
•  Display of mechanical errors
 
 
 
M*
    M*  : The number of mechanical error (“0” is latest one)
    
 (Press [>] button to display the next error)
•  Display of no disc errore
 
 
 
D*$$%%&&##00
    D*  : The number of no disc error (“0” is latest one)
    
 (Press [>] button to display next error)
   $$  : Error type
    
 01 : Focus error
    
 02 : GFS error
    
 03 : Setup error
   %% : Not used
   && :
     
  00 : No disc judgment without chucking retry.
     
  01 : No disc judgment after chucking retry.
    ##  : The state when judged as no disc
    
 01 : Stop
    
 02 : Setup
    
 03 : TOC reading
    
 04 : Access
    
 05 : Playback
    
 06 : Pause
    
 07 : Manual search (Play)
    
 08 : Manual search (Pause)
Display of 
Total Error
Display of 
Mechanical
Errors
FF button
AMS (+)
button
AMS (+)
button
AMS (–)
button
AMS (–)
button
FR button
FF button
FR button
Display of 
No Disc
Errors
HCD-ZT4
20
SECTION  5
MECHANICAL  ADJUSTMENTS
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 demag-
netizer. (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
FWD
CQ-102AS
2.0 – 8.0 mN • m 
(20 to 80 g • cm)
(0.28 – 1.12 oz • inch)
FWD
Back Tension
CQ-102C
0.15 – 0.6 mN • m 
(1.5 to 6 g • cm)
(0.021 – 0.083 oz • inch)
FF
CQ-201AS
5 – 17.7 mN • m 
(50 to 177 g • cm)
(0.7 – 2.48 oz • inch)
REV
CQ-201B
5 – 17.7 mN • m 
(50 to 177 g • cm)
(0.7 – 2.48 oz • inch)
•  Tape Tension Measurement
Mode
Tension Meter
Meter Reading
FWD
CQ-403A
more than 80 g
(more than 2.82 oz)
VACS  DISPLAY
This mode is used to check the VACS level.
Procedure:
1. Press 
[
?/1
] button to turn on the system.
2.  Press [ERASE] button, [x] button and [ENTER] button si-
multaneously.
3. The fl uorescent indicator tube displays “VACSA”. “A” repre-
sents Conventional VACS (Triggered by signal level) 
4.  To release from this mode, do the step 2 again.
METER  SWITCH  TOUCH  COUNT  DISPLAY
This mode is used to display the total count of meter pointer touch 
initial switch and max switch.
Procedure:
1. Press 
[
?/1
] button to turn on the system.
2. Press [x] button, [ENTER] button and [DISPLAY] button si-
multaneously.
3. The 
fl uorescent indicator tube displays “IxxxxxMyyyyy”. 
 
“I” represents the Initial Switch touch. 
 
“xxxxx” represents the total count of Initial Switch touch.
 
(Maximum Value of “xxxxx” = 65535)
 
“M” represents the Max Switch touch. 
 
“yyyyy” represents the total count of Max Switch touch.
 
(Maximum Value of “yyyyy” = 65535)
4.  To release from this mode, do the step 2 again. The fl uorescent 
indicator tube displays “MODE OUT”. 
METER  TEST  MODE
This mode is used to check the meter device.
Procedure:
1. Press 
[
?/1
] button to turn on the system.
2. Press 
[x] button, [ENTER] button and [METER MODE] but-
ton simultaneously and the message “TST MODE IN” appears 
on the fl uorescent indicator tube.
3.  Meter Backlight LEDs, Meter Pointer LEDs, Power Illumina-
tor LEDs and fl uorescent indicator tube are lighted up. 
4.  When you want to perform count total step from Initial Switch 
to Max Switch operation mode, press [M] button. The me-
ter pointer will move from Initial Switch to Max Switch and 
fi nally move back to the middle position. The total step count 
information appears on the fl uorescent indicator tube. “xxx 
STP yy” is shown.
 
“xxx” represents the total step.
 
(Value of “xxx” should between 430 steps to 470 steps)
 
“yy” represents the status of total step count.
 
(If total step between 430 steps to 470 steps, “yy” is OK, Else 
“yy” is NG)
5.  When you want to perform count total step from Max Switch 
to Initial Switch operation mode, press [m] button. The me-
ter pointer will move from Max Switch to Initial Switch and 
fi nally move back to the middle position. The total step count 
information appears on the fl uorescent indicator tube. “xxx 
STP yy” is shown.
 
“xxx” represents the total step.
 
(Value of “xxx” should between 430 steps to 470 steps)
 
“yy” represents the status of total step count.
 
(If total step between 430 steps to 470 steps, “yy” is OK, else 
“yy” is NG).
6.  To release from this mode, do the step 2 again. The fl uorescent 
indicator tube displays “TST MODE OUT”. 
Page of 84
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