JVC RC-660 LE - Mechanical Adjustments and Procedures; Dial Cord Installation Guide; Cassette Mechanism Adjustment Guide

RC-660L/LB/LD/LE/LS
How to Engage Dial Cord
1. Turn the dial drum fully clockwise (to the highest fre-
quency).
2. Use Kevlar Cord (620 mm long and 0.4 mm diameter).
3. Instail the string in the sequence of the numbers.
Nw
@
Wind on the shaft
Three turns
Fig. 7
Main Adjustment
[1] Adjustment of Cassette Mechanism
Check the following items after cassette mechanism parts are replaced.
Item Requirements Test equipment Test tape
Rated voltage: 9.0 VDC
1. Source voltage Motor operating voltage Regulated power supply —— 4
range: 7—10V DC
4.8 cm/sec (3,000 Hz)
2. Tapespeed | _...... 2,060 ~ 3,090 Hz Frequency counter (digital counter) | VTT-656A
Deviation within 60 Hz
3. Wow & flutter Less than 0.35% (RMS) Wow meter VTT-656A
PLAY 35—75g.cm During FF and rewind, the idlers,
reels and flywheel should not slip =o
4. Take-up torque FF 60—200 g.cm against each other when the reels
REW 60—200 g.cm are locked.
5. Current ie RAS Cs Saeed a C-60 (take-up torque
consumption FF 250 mA or less DC ammeter should be normal when
(of motor alone) | Rew 250 mA or less tape is used.)
Tension gauge
Pull the pinch roller perpendicularly
6. Pinch roller 375~475g and read the gauge
pressure
when the pinch
roller just stops.
ies
7. Head position
During PLAY (RECORD) the
dimensional requirements
operation and
extent move-
ment
perpendicularly and
read the gauge when
the mechanism just
Auto stop.
40~70g
|
Cassette Guide
during PLAY given here must be met, and | Any cassette tape
and RECORD the heads must not contact
the cassette case.
~70
:
#0 q Tension gauge pull
8. Auto-stop Within 3.5~5.5mm the Auto stop lever
Any cassette tape
6 (No. 1533)