Revox A77 Service Manual

3.9. Removal of Power Transformer
Fig.3.9-12
— Remove output amplifiers I if present 1.
— Disconnect brake solenoid cables ( unsolder ) per fig.
3.5 — 6, B.
— Disengage cable to right-hand reel motor on regulator
board ( fig. 3.6 — 7 ).
— Disengage cable to capstan motor and pick-up on motor
control board ( fig. 3.7 — 9 ).
Note:
For improved signal to noise performance, the capstan
motor connections may be reversed on some recorders in
the following manner: E3 = gry, E4 = yel, E5 = gm.
Carefully note wire colors before disassembling.
Right Reel Motor
yel D13
gm n 014
blu ( grn/blid D15
brn ( yel/b1k) D16
yel 017
blk DFJ1
gry DF4
brn CD1
yel 010
blu CD2
red D11
wht
DF3
gm D9
vio DY1
brn D12
Fig. 3.9-13
Mal
IMO
•
•
•
Switch
Speakers
Off
II
Iwht DK2
Igrn DK1
org
• wht D4 • gry D1•
wht D3 • gry D20
Built-in
Loudspeaker
CDU1
C.)
IBM
Lu
•
/
-Y
.3
•
UJ LU
C
.3 - o
Pick-up
Ez 25 2i 3
• • - • ---
II I I I I II I I I I I
r- r- et cy CY CY CY CY
CO
U- 2 LL CO C) o
cl 00 cl 0 0 CC UJ Cr uj
Je . 2 . 0 E 1B
— Unscrews transformer fasteners and remove entire assem-
bly carefully downward.
Pull off circuit cards and corresponding connectors as
needed ( fig. 3.9 — 12 and 3.9 — 13).
Fig. 3.10-14
CY
CD
yel DG6
wht DG4
blu DG5
LU W
C
>•• 11,
LC)
tED
Capstan
Motor
Speakers
Output
3.10. Removal of Amplifier Cards
— Mark record and playback amplifiers
The amplifiers have to be reinserted
places to maintain correct level settings.
— Remove cover panel on the front side
cards.
1
CO
LU
gm DG3
blk DG1
red DG2
before removing.
in their respective
and pull amplifier
9

Revox A77 Specifications

General

Brand	Revox
Model	A77
Category	Tape Deck
Language	English