Pioneer rt 1020 l service manual

Page 1

< TD-73002 >

SERVICE MANUAL

ADDITIONAL INFORMATION ON MODEL RT-1020L

Notice: CONTROL CIRCUIT ASSEMBLY OF MODEL RT-IOZOL

On account of modification due to improvement, conventional Assembly
RWG-04O will be replaced by a new type of Assembly RWG-037-Astarting
at the serial No, 14351 and the following in serial order.

Subject:
(1) Conventional Assembly RWG-040 and improved version RWG-037-A are mutually

interchangeable.
(2) You are requested to make use of this additional information together with the

furnished service manual.

GDPIONIEER

( 73l02F31F >

Page 2

CIRCUIT DESCRIPTION

The addition of a transistor to the control
circuit (the timing circuit operative when
switching from Fast Forward or Rewind to
Playback) has increased the stability of the
relay timing (i.e. the delay).

The summary of the circuit is shown in
Fig. 1. It operates as follows:

RELAY FUNCTIONS (Fig. 1)

The control circuit employs three relays which
function as follows:

RLsoi. .

. functions during Fast Forward and

Rewind.

Switching to Fast Forward (or
Rewind), negative bias is applied to
the base of transistor Qso4 via
resistor R613 ~ diode D613 ~
R609 ~ switch 817-2 (816-2), the

RL602. .

RLsos. .

transistor comes 0N, and the relay
operates.

functions during Playback and
Recording.

Switching to Playback or Recording
functions, current flows through
the fuse resistor FR602 ~

RLsoz ~ relay contact RL601~

820 ~ Sis-1 ~ 516-2 ~ 817-2
and the relay operates.

. functions at Stop (which means

the stopping of tape running).
When the POWER switch 812 and
the shut-off switch SIS are ON,
current flows through D605 ~
FReoa ~ RLsoa ~ 318-] ~

816-2 ~ 817-2 and the relay oper-
ates.

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Din 05.. L-l
NoYES
sn = 5mm no'nm 5., ' snort-07F
T11 TAKE-UP HDIOR Sm . REWIND
rm CAPSYAN new; 5,, . FAST swam
s; m: 39m 5.. » PLAY
a s mus-on :2. must
°' 5., mwsn
S FREQUENCY
Sn FREQUENCY
5L,
Fig. 1