Technics SU-V60 Service Manual

| SU-V60 |
i
CONTENTS
Page Page
SAFETY PRECAUTION ............00cc cee eeeeeeee 2 PRINTED CIRCUIT BOARDS..............06. 9~14
LOCATION OF CONTROLS...............-..---- 3 CIRCUIT BOARDS AND WIRING
PROTECTION CIRCUITRY .......... 00050 e eves 4 CONNECTION DIAGRAM........ 15 ~16
BEFORE REPAIR AND ADJUSTMENT .............. 4 SCHEMATIC DIAGRAM ...........-2--.005- 17~21
DISASSEMBLY INSTRUCTIONS ................. 5,6 REPLACEMENT PARTS LIST................4. 22 ~23
MEASUREMENTS AND ADJUSTMENTS ............. 6 EXPLODED VIEW..........--.-----00-0es 24, 25
BLOCK DIAGRAM .........-.0000 eee ee eeeee 7,8
li LOCATION OF CONTROLS
(voltage control) tgs Bt
9 | Amplifier operation indicator
(current drive
Balance control
(treble)
Tone controls
(bass)
Power switch
Subsonic filter (Hl off, = 20Hz)
Loudness switch ( @ off, = on)
CD direct (@ off, = on)
Phono selector ( ® MM, = MC)
Volume control
Recording selector
Tone
control
indicators
(H direct, = on)——~———————_—_fx] pond etna
Headphones “Oo co |
Input selector
indicators
(main) (phono)
Speaker selector| _
(Hi off, = on) + ance (tuner)
Input selectors
(CD)
Recording-mode selector
(tape 1 2, tape 21, AV/aux, CD, tuner, phono) LAN Tat
Tape 2
+ Tape monitor selectors
Tape 1/DA tape
Speaker impedance selector
(8~ 162/162 << 4~60/8)
AC inlet
Switched (50W MAX.)
L AC outlets
Unswitched
[For M, MC, XA
(Total
200OW
MAX.)
areas]
Voltage selector (on the bottom board)
(127V <> 110V <» 220V <> 240V)
| (For [XA] area only)
Remote speaker terminal
Main speaker terminal
aN, eee
@ The power supply for this unit varies depending upon the areas. Also, the parts used for power supply are different.
So, refer to the circuit diagram and replacement parts list.
* [M] [MC] area is provided with AC outlets.
* 120V (60Hz) for U.S.A.
* [XA] area is provided with voltage selector and AC outlets.
* QAOV (50/60Hz) for Australia and United Kingdom.
* 920V (50/60Hz) for Continental Europe.
* 127V/110V/220V/240V (50/60Hz) for other [XA] area.
Phono input capacitance is about 150pF.
Suggestions
Notes:
e@To record sounds from a compact disc, press the input
selector marked “‘CD”.
The compact-disc-direct switch is for listening only; it
cannot be used to select the compact disc as a recording
source.
elf noise is very annoying while listening to an FM or AM
broadcast, switch OFF the video disc player, compact-disc
player and turntable.
eSwitch OFF the video disc player power if noise is
excessive while listening to an audio tape, compact disc or
regular phono disc.
MH PROTECTION CIRCUITRY
The protection circuitry may have operated if either of the following conditions is noticed:
e@ No sound is heard when the power is switched ON.
e Sound stops during a performance.
The function of this circuitry is to prevent circuitry damage if, for example, the positive and negative speaker Connection wires
are ‘‘shorted’’ , or if speaker systems with an impedance less than the indicated rated impedance of this unit are used.
If this occurs, follow the procedure outlined below:
1. Switch OFF the power.
2. Determine the cause of the problem and correct it.
3. Switch ON the power once again.
Note:
When the protection circuitry functions, the unit will not operate unless the power is first switched OFF and then ON again.
@ BEFORE REPAIR AND ADJUSTMENT
(1) Turn off the power supply. Using a 1022, 5W resistor, shortcircuit both ends of power supply capacitors (C503, C504,
6800uF) in order to discharge the voltage.
(2) Before turning on the power switch of the set...
A. Connect the voltage controller to the primary side.
B. Connect the AC ampere meter to the primary side or connect the DC voltage metar to the “+B” circuit of the
secondary side.
C. Turn the VR of ICO (VR401 and VR402) to minimum (counterclockwise).
D. After setting the output to zero of the voltage contoller, turn on the power switch of the set.
And increase the output of voltage controller gradually.
Then, check carefully whether the current value of primary side become more than followings value or whether
the DC voltage of secondary side is increasing slowly.
E. If the value of current is increasing unusually or the DC voltage is not increasing, lower the output level of voltage
contoller immediately.
F. Check the transistors of voltage amplifier and current amplifier 1C501.
G. After repairing, adjust the ICQ.
@
The
current
value
of
the
primary
side
at
no
signal.
(Confirm
the
power
supply
voltage
of
each
area
and
provided
voltage of the set.)
AC110V AC120V AC127V AC240V
Consumed current 50/60Hz | 280 ~560mA | 260~520mA | 260 ~520mA 140 ~ 280mA | 130~ 260mA
Power supply voltage
AC220V

Technics SU-V60 Specifications

General

Brand	Technics
Model	SU-V60
Category	Amplifier
Language	English