Sony TC-765 - Section 2: Disassembly and Repair; Notes on Repair and Tape Recommendations

1-3.
NOTE ON REPAIRING
NOTE ON REPAIRING
1.
This set does not change playback level when
TAPE SELECT switches are changed.
The LINE OUT signal is cut when REC MONI-
TOR MUTE switch (S607) on the rear panel is
turned ON except when MONITOR switch is
in TAPE position in playback mode.
If TIMER switch is previously set to ON
position, it may happen to erase test tapes
because the set becomes automatically in the
auto playback (awakening) or auto record mode
determined by REC MODE switch position
when POWER switch is turned ON.
PB LEVEL controls on the front panel control
LINE OUT and HEADPHONES levels, and also
VU meters indicate the amount of PB LEVEL
controlling. When PB LEVEL is in the center-
click positions, LINE OUT levels are standard
0.44V (-5dB) and VU meters indicate ‘‘0”’.
When PB LEVEL controls are in their full-
clockwise stops, LINE OUT levels are 0.775V
(0 dB).
. Three kinds of hexagonal-socket screwdrivers
are needed for the following adjustment/
removal.
Screwdriver Adjustment/removal
Tension-arm pin
O + 1.27 Intermediate pin
ane Switch knob
Switch lever
Head azimuth
OT Ls FG-holding boss
ee Control knob
Motor pulley
SONY-00527 / DRUCK 4
| TC-765 1TC-765 |
Tape BIAS/EQ recommendations
The following list shows the recommended
settings, which have been determined through
critical listening tests and electrical character-
istic measurements on commercially available
tapes. The setting can be changed according to
the personal preference. For Sony tapes, be
sure to use the recommended settings to obtain
the optimum tape characteristics.
NORMAL SPECIAL
BASF LH, LHS SCOTCH #211,
SONY PR AGFA PE, PEM #212, #213
_|MEMOREX AMPEX 406, 407
SONY SLH SONY DUAD
SCOTCH CLASSIC |SCOTCH #206,
TDK AUDUA #207
MAXELL UD
SCOTCH #250
SCOTCH #218
SECTION 2
DISASSEMBLY
(to Mechanical Adjustment)
(to VU Meter and Variable Resistor Replacement)
(to Fuse Replacement)
(to Audio Amp Board Check)
(to Tape Speed and Forward Torque Adjustments)
(to B+ and Supply Reel Back Tension Adjustments)
(to System Control Board Checking)
Reel Panel Removal:
Amp Panel Removal:
Perforated Panel (top) Removal:
Perforated Panel (bottom) Removal:
Side Board (right) Removal:
Side Board (left) Removal:
Rear Board Removal:
>
0,90
8,0
0,9
0,0
®,®
®,®
©, ®
® ©
CS)
RK3x8
washer 12)
reel panel washer RK 3x8
reel panel
washer 0
reel sher
washer eel panel washe
reel panel washer 5)
RK3x8 f
°|
amp panel
perforated panel (top)
@ 84x10
ral
@ PS4xi0'
perforated panel
(bottom)
foot ass’y
rear board